2020-12-27  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/abi.xml: Update link to Arm ABI.
	* doc/html/manual/abi.html: Regenerate.

2020-12-27  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/debug.xml: Move Valgrind references to https.
	* doc/html/manual/debug.html: Regenerate.

2020-12-26  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/abi.xml: Update link to Intel's compatibility
	with GNU compilers document.
	* doc/html/manual/abi.html: Regenerate.

2020-12-25  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/messages.xml: Update link to Java docs.
	* doc/html/manual/facets.html: Ditto.

2020-12-25  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/documentation_hacking.xml: Convert three links
	to doxygen.nl to https.
	* doc/html/manual/documentation_hacking.html: Regenerate.

2020-12-23  Olivier Hainque  <hainque@adacore.com>

	* testsuite/17_intro/names.cc: Account for VxWorks headers.

2020-12-21  Patrick Palka  <ppalka@redhat.com>

	* include/bits/c++config (_GLIBCXX_FLOAT_IS_IEEE_BINARY_32):
	Define this macro.
	(_GLIBCXX_DOUBLE_IS_IEEE_BINARY_64): Likewise.
	* include/std/charconv (to_chars): Use these macros to
	conditionally hide the overloads for floating-point types.
	* src/c++17/floating_to_chars.cc: Use the macros to
	conditionally disable this file.
	(floating_type_traits<float>): Remove redundant static assert.
	(floating_type_traits<double>): Likewise.
	* testsuite/20_util/to_chars/double.cc: Run this test only on
	ieee-floats effective targets.
	* testsuite/20_util/to_chars/float.cc: Likewise.
	* testsuite/20_util/to_chars/long_double.cc: Likewise.
	* testsuite/lib/libstdc++.exp
	(check_effective_target_ieee-floats): Define new proc for
	detecting whether float and double have the IEEE binary32 and
	binary64 formats.

2020-12-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/semaphore: Fix indentation.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/98377
	* src/c++17/floating_to_chars.cc (__floating_to_chars_precision):
	Fix mistake.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/98370
	* src/c++17/floating_to_chars.cc (__floating_to_chars_shortest):
	Provide explicit template arguments to the call to std::max.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/98374
	* src/c++17/floating_to_chars.cc: Guard include of <langinfo.h>
	with __has_include.
	(__floating_to_chars_precision) [!defined(RADIXCHAR)]: Don't
	attempt to obtain the radix character of the current locale,
	just assume it's '.'.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_from_chars.cc (from_chars_impl)
	[!defined(FE_TONEAREST)]: Don't adjust the rounding mode.
	* src/c++17/floating_to_chars.cc (__floating_to_chars_precision):
	Likewise.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	* testsuite/20_util/to_chars/double.cc: New test, consisting of
	testcases imported from the MSVC STL testsuite.
	* testsuite/20_util/to_chars/float.cc: Likewise.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	* config/abi/pre/gnu.ver: Add new exports.
	* include/std/charconv (to_chars): Declare the floating-point
	overloads for float, double and long double.
	* src/c++17/Makefile.am (sources): Add floating_to_chars.cc.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/floating_to_chars.cc: New file.
	(to_chars): Define for float, double and long double.
	* testsuite/20_util/to_chars/long_double.cc: New test.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/ryu/common.h, src/c++17/ryu/d2fixed.c,
	src/c++17/ryu/d2fixed_full_table.h, src/c++17/ryu/d2s.c,
	src/c++17/ryu/d2s_intrinsics.h, src/c++17/ryu/f2s.c,
	src/c++17/ryu/f2s_intrinsics.h, src/c++17/ryu/generic_128.c:
	Apply local modifications.

2020-12-18  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/ryu/MERGE: New file.
	* src/c++17/ryu/common.h, src/c++17/ryu/d2fixed.c,
	src/c++17/ryu/d2fixed_full_table.h, src/c++17/ryu/d2s.c,
	src/c++17/ryu/d2s_full_table.h, src/c++17/ryu/d2s_intrinsics.h,
	src/c++17/ryu/digit_table.h, src/c++17/ryu/f2s.c,
	src/c++17/ryu/f2s_intrinsics.h, src/c++17/ryu/generic_128.c,
	src/c++17/ryu/generic_128.h, src/c++17/ryu/ryu_generic_128.h:
	Import these files from the Ryu library.

2020-12-17  Jonathan Wakely  <jwakely@redhat.com>

	* config/os/djgpp/error_constants.h: Test POSIX errno macros
	directly, instead of corresponding _GLIBCXX_HAVE_EXXX macros.
	* config/os/mingw32-w64/error_constants.h: Likewise.
	* config/os/mingw32/error_constants.h: Likewise.

2020-12-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp (check_v3_target_gthreads_timed):
	Fix condition for _GTHREAD_USE_MUTEX_TIMEDLOCK test.

2020-12-17  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/mutex.cc (std::once_flag::_M_finish): Add
	maybe_unused attribute to variable used in assertion.

2020-12-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98344
	* include/bits/semaphore_base.h: Fix preprocessor condition.

2020-12-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_thread.h (hash<thread::id>): Move here,
	from ...
	* include/std/thread (hash<thread::id>): ... here.

2020-12-17  Jonathan Wakely  <jwakely@redhat.com>

	* config.h.in: Regenerate.
	* configure: Regenerate.

2020-12-16  Jonathan Wakely  <jwakely@redhat.com>

	* Makefile.in: Regenerate.
	* config.h.in: Regenerate.
	* config/abi/pre/gnu.ver: Make patterns less greedy.
	* config/os/gnu-linux/ldbl-ieee128-extra.ver: New file with patterns
	for IEEE128 long double symbols.
	* configure: Regenerate.
	* configure.ac: Enable alternative 128-bit long double format on
	powerpc64*-*-linux*.
	* doc/Makefile.in: Regenerate.
	* fragment.am: Regenerate.
	* include/Makefile.am: Set _GLIBCXX_LONG_DOUBLE_ALT128_COMPAT.
	* include/Makefile.in: Regenerate.
	* include/bits/c++config: Define inline namespace for new long
	double symbols. Don't define _GLIBCXX_USE_FLOAT128 when it's the
	same type as long double.
	* include/bits/locale_classes.h [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT]
	(locale::_Impl::_M_init_extra_ldbl128): Declare new member function.
	* include/bits/locale_facets.h (_GLIBCXX_NUM_FACETS): Simplify by
	only counting narrow character facets.
	(_GLIBCXX_NUM_CXX11_FACETS): Likewise.
	(_GLIBCXX_NUM_LBDL_ALT128_FACETS): New.
	[_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT] (num_get::__do_get): Define
	vtable placeholder for __ibm128 long double type.
	[_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__]
	(num_get::__do_get): Declare vtable placeholder for __ibm128 long
	double type.
	[_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__]
	(num_put::__do_put): Likewise.
	* include/bits/locale_facets.tcc
	[_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__]
	(num_get::__do_get, num_put::__do_put): Define.
	* include/bits/locale_facets_nonio.h
	[_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__]
	(money_get::__do_get): Declare vtable placeholder for __ibm128 long
	double type.
	[_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__]
	(money_put::__do_put): Likewise.
	* include/bits/locale_facets_nonio.tcc
	[_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT && __LONG_DOUBLE_IEEE128__]
	(money_get::__do_get, money_put::__do_put): Define.
	* include/ext/numeric_traits.h [_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT]
	(__numeric_traits<__ibm128>, __numeric_traits<__ieee128>): Define.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.am: Add compatibility-ldbl-alt128.cc and
	compatibility-ldbl-alt128-cxx11.cc sources and recipes for objects.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++11/compatibility-ldbl-alt128-cxx11.cc: New file defining
	symbols using the old 128-bit long double format, for the cxx11 ABI.
	* src/c++11/compatibility-ldbl-alt128.cc: Likewise, for the
	gcc4-compatible ABI.
	* src/c++11/compatibility-ldbl-facets-aliases.h: New header for long
	double compat aliases.
	* src/c++11/cow-locale_init.cc: Add comment.
	* src/c++11/cxx11-locale-inst.cc: Define C and C_is_char
	unconditionally.
	* src/c++11/cxx11-wlocale-inst.cc: Add sanity check. Include
	locale-inst.cc directly, not via cxx11-locale-inst.cc.
	* src/c++11/locale-inst-monetary.h: New header for monetary
	category instantiations.
	* src/c++11/locale-inst-numeric.h: New header for numeric category
	instantiations.
	* src/c++11/locale-inst.cc: Include new headers for monetary,
	numeric, and long double definitions.
	* src/c++11/wlocale-inst.cc: Remove long double compat aliases that
	are defined in new header now.
	* src/c++17/Makefile.am: Use -mabi=ibmlongdouble for
	floating_from_chars.cc.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/floating_from_chars.cc (from_chars_impl): Add
	if-constexpr branch for __ieee128.
	(from_chars): Overload for __ieee128.
	* src/c++20/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/c++98/locale_init.cc (num_facets): Adjust calculation.
	(locale::_Impl::_Impl(size_t)): Call _M_init_extra_ldbl128.
	* src/c++98/localename.cc (num_facets): Adjust calculation.
	(locale::_Impl::_Impl(const char*, size_t)): Call
	_M_init_extra_ldbl128.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/util/testsuite_abi.cc: Add new symbol versions.
	Allow new symbols to be added to GLIBCXX_IEEE128_3.4.29 and
	CXXABI_IEEE128_1.3.13 too.
	* testsuite/26_numerics/complex/abi_tag.cc: Add u9__ieee128 to
	regex matching expected symbols.

2020-12-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/utility: Use __has_builtin without checking if
	it's defined.

2020-12-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config: Warn if __STRICT_ANSI__ state is
	inconsistent with __GLIBCXX_TYPE_INT_N_0.

2020-12-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96083
	* include/ext/throw_allocator.h: Use __has_builtin to check for
	__builtin_sprintf support, and use std::sprintf if necessary.

2020-12-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98319
	* include/experimental/random: Only define contents for C++14
	and later.
	* include/experimental/source_location: Likewise.
	* include/experimental/utility: Likewise.
	* testsuite/experimental/feat-lib-fund.cc: Include all LFTS
	headers that are present. Allow test to run for all modes.

2020-12-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/46447
	* testsuite/performance/29_atomics/atomic_flag.cc: New test.

2020-12-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93151
	* acinclude.m4 (GLIBCXX_CHECK_SYSTEM_ERROR): Remove.
	* configure.ac: Regenerate.
	* config/os/generic/error_constants.h: Test POSIX errno macros
	directly, instead of corresponding _GLIBCXX_HAVE_EXXX macros.
	* testsuite/19_diagnostics/headers/system_error/errc_std_c++0x.cc:
	Likewise.
	* testsuite/19_diagnostics/headers/system_error/93151.cc: New
	test.

2020-12-15  Jonathan Wakely  <jwakely@redhat.com>

	Revert:
	2020-12-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98108
	* include/std/iostream (__ioinit): Add init_priority attribute.

2020-12-15  Keith Packard  <keithp@keithp.com>

	* acinclude.m4 (GLIBCXX_ENABLE_CSTDIO): Allow "stdio_pure"
	option and define _GLIBCXX_USE_PURE_STDIO when it is used. Also
	add "stdio_posix" option as an alias for "stdio".
	* config/io/basic_file_stdio.cc [_GLIBCXX_USE_PURE_STDIO]: Only
	use defined stdio entry points for all I/O operations, without
	direct calls to underlying POSIX functions.
	* config.h.in: Regenerate.
	* configure: Regenerate.

2020-12-15  Ville Voutilainen  <ville.voutilainen@gmail.com>

	* testsuite/27_io/rvalue_streams.cc: Run the extraction to a char*
	for C++17 and lower only.

2020-12-15  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/25_algorithms/lexicographical_compare/deque_iterators/1.cc:
	Add dg-timeout-factor directive.
	* testsuite/ext/pb_ds/regression/tree_map_rand_debug.cc:
	Increase timeout factor from 2.0 to 3.0.
	* testsuite/ext/pb_ds/regression/tree_set_rand_debug.cc:
	Likewise.
	* testsuite/lib/libstdc++.exp (check_effective_target_debug-mode):
	Define "debug-mode" as an effective-target keyword.

2020-12-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (__glibcxx_assert_1): Define as empty
	for C++11.

2020-12-15  Marius Hillenbrand  <mhillen@linux.ibm.com>

	* testsuite/22_locale/locale/cons/5.cc: Add missing directives
	for required locales.

2020-12-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (incrementable_traits<Tp>):
	Remove workaround for PR c++/78173.

2020-12-15  Vladimir Vishnevsky  <vv.os.swe@gmail.com>

	* configure.ac: Skip AC_LIBTOOL_DLOPEN check if avr-libc is used.
	* configure: Regenerate.

2020-12-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98108
	* include/std/iostream (__ioinit): Add init_priority attribute.

2020-12-15  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/codecvt.xml: Update link to Unicode-HOWTO.
	* doc/html/manual/facets.html: Regenerate.

2020-12-14  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite/23_containers/array/debug/back1_neg.cc: Target c++14 because assertion
	is disabled in C++11.
	* testsuite/23_containers/array/debug/front1_neg.cc: Likewise.
	* testsuite/23_containers/array/debug/square_brackets_operator1_neg.cc: Likewise.

2020-12-14  Martin Sebor  <msebor@redhat.com>

	* testsuite/ext/vstring/requirements/exception/basic.cc: Suppress
	a false positive warning.
	* testsuite/ext/vstring/requirements/exception/propagation_consistent.cc:
	  Same.

2020-12-14  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite/23_containers/array/debug/back2_neg.cc: target c++14 because assertion
	for constexpr is disabled in C++11.
	* testsuite/23_containers/array/debug/front2_neg.cc: Likewise.
	* testsuite/23_containers/array/debug/square_brackets_operator2_neg.cc: Likewise.
	* testsuite/23_containers/vector/debug/multithreaded_swap.cc: Include <memory>
	for shared_ptr.

2020-12-12  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/macros.h (__glibcxx_check_can_increment_range): Replace
	_GLIBCXX_DEBUG_VERIFY_COND_AT usage with _GLIBCXX_DEBUG_VERIFY_AT_F.
	(__glibcxx_check_can_decrement_range): Likewise.
	* testsuite/25_algorithms/copy_backward/constexpr.cc (test03): New.
	* testsuite/25_algorithms/copy/debug/constexpr_neg.cc: New test.
	* testsuite/25_algorithms/copy_backward/debug/constexpr_neg.cc: New test.
	* testsuite/25_algorithms/equal/constexpr_neg.cc: New test.
	* testsuite/25_algorithms/equal/debug/constexpr_neg.cc: New test.

2020-12-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98226
	* include/std/bit (__countl_one, __countr_one): Remove redundant
	branches.

2020-12-09  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Define NO_SLEEP
	if none of nanosleep, sleep and Sleep is available.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/std/thread [_GLIBCXX_NO_SLEEP] (__sleep_for): Do
	not declare.
	[_GLIBCXX_NO_SLEEP] (sleep_for, sleep_until): Do not
	define.
	* src/c++11/thread.cc [_GLIBCXX_NO_SLEEP] (__sleep_for): Do
	not define.

2020-12-08  Jason Merrill  <jason@redhat.com>

	PR c++/96299
	* testsuite/18_support/comparisons/algorithms/partial_order.cc:
	One more line needs to use VERIFY instead of static_assert.

2020-12-08  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/appendix_contributing.xml: Use consistent
	indentation.
	* doc/html/manual/source_code_style.html: Regenerate.

2020-12-05  Iain Sandoe  <iain@sandoe.co.uk>

	PR target/97865
	* configure: Regenerate.

2020-12-04  Jakub Jelinek  <jakub@redhat.com>

	PR c++/80780
	* testsuite/18_support/source_location/1.cc (main): Adjust for
	__builtin_source_location using __PRETTY_FUNCTION__-like names instead
	__FUNCTION__-like.
	* testsuite/18_support/source_location/consteval.cc (main): Likewise.

2020-12-03  Martin Sebor  <msebor@redhat.com>

	* testsuite/ext/vstring/modifiers/clear/56166.cc: Suppress a false
	positive warning.

2020-12-03  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/bit/bit.cast/bit_cast.cc: Remove stray
	word from copy&paste.
	* testsuite/26_numerics/bit/bit.cast/version.cc: Likewise.

2020-12-03  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update C++20 status.
	* doc/html/*: Regenerate.

2020-12-03  JeanHeyd Meneide  <phdofthehouse@gmail.com>

	* doc/doxygen/user.cfg.in (INPUT): Add <source_location>.
	* include/Makefile.am: Add <source_location>.
	* include/Makefile.in: Regenerate.
	* include/std/version (__cpp_lib_source_location): Define.
	* include/std/source_location: New file.
	* testsuite/18_support/source_location/1.cc: New test.
	* testsuite/18_support/source_location/consteval.cc: New test.
	* testsuite/18_support/source_location/srcloc.h: New test.
	* testsuite/18_support/source_location/version.cc: New test.

2020-12-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93121
	* include/std/bit (__cpp_lib_bit_cast, bit_cast): Define.
	* include/std/version (__cpp_lib_bit_cast): Define.
	* testsuite/26_numerics/bit/bit.cast/bit_cast.cc: New test.
	* testsuite/26_numerics/bit/bit.cast/version.cc: New test.

2020-12-03  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/post/powerpc-linux-gnu/baseline_symbols.txt:
	Update.
	* config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt:
	Update.

2020-12-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/array (array::operator[](size_t) const, array::front() const)
	(array::back() const) [__cplusplus == 201103]: Disable
	assertions.
	* testsuite/23_containers/array/element_access/constexpr_element_access.cc:
	Check for correct values.
	* testsuite/23_containers/array/tuple_interface/get_neg.cc:
	Adjust dg-error line numbers.
	* testsuite/23_containers/array/debug/constexpr_c++11.cc: New test.

2020-12-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/65480
	PR libstdc++/68735
	* python/libstdcxx/v6/printers.py (function_pointer_to_name):
	New helper function to get the name of a function from its
	address.
	(StdExpAnyPrinter.__init__): Use it.

2020-12-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/dg-options.exp (add_options_for_libatomic):
	Replace powerpc-ibm-aix* and powerpc*-*-darwin* with check for
	powerpc && ilp32.

2020-12-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_istream/ignore/char/94749.cc: Add
	dg-timeout-factor for ilp32 targets.
	* testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc:
	Likewise.

2020-12-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/rope (rope::_S_concat_char_iter)
	(rope::_S_destr_concat_char_iter): Add allocator parameter.
	(rope::push_back, rope::append, rope::insert, operator+):
	Pass allocator.
	* include/ext/ropeimpl.h (rope::_S_concat_char_iter)
	(rope::_S_destr_concat_char_iter): Add allocator parameter
	and use it.
	(_Rope_char_ref_proxy::operator=(_CharT)): Pass allocator.

2020-12-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/rope: Fix indentation of access specifiers.

2020-12-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_timed_wait.h: Use #if instead of #ifdef.
	* include/bits/semaphore_base.h: Likewise.
	* include/std/version: Remove trailing whitespace.

2020-12-02  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdExpPathPrinter): Store the
	name of the type and pass it to the iterator.
	(StdPathPrinter): Likewise.
	* testsuite/libstdc++-prettyprinters/filesystem-ts.cc: New test.

2020-12-01  Thomas Rodgers  <trodgers@redhat.com>

	* include/bits/atomic_base.h: Replace usage of
	_GLIBCXX_HAVE_ATOMIC_WAIT with __cpp_lib_atomic_wait.
	* include/bits/atomic_timed_wait.h: Likewise.
	* include/bits/atomic_wait.h: Define __cpp_lib_atomic_wait
	feature test macro.
	* include/bits/semaphore_base.h: Replace usage of
	_GLIBCXX_HAVE_ATOMIC_WAIT with __cpp_lib_atomic_wait.
	* include/std/atomic: Likewise.
	* include/std/latch: Likewise.
	* include/std/semaphore: Likewise.
	* include/std/version: Define __cpp_lib_atomic wait
	feature test macro and replace usage of
	_GLIBCXX_HAVE_ATOMIC_WAIT.
	* testsuite/29_atomics/atomic/wait_notify/1.cc: New test.
	* testsuite/29_atomics/atomic/wait_notify/2.cc: Likewise.

2020-12-01  Michael Weghorn  <m.weghorn@posteo.de>

	* python/libstdcxx/v6/printers.py (StdBitIteratorPrinter)
	(StdBitReferencePrinter): Add pretty-printers for
	_Bit_reference, _Bit_iterator and _Bit_const_iterator.
	* testsuite/libstdc++-prettyprinters/simple.cc: Test
	std::_Bit_reference, std::_Bit_iterator and
	std::_Bit_const_iterator.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

2020-12-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (_GLIBCXX_HAS_BUILTIN): Define macro to
	work around different implementations of __has_builtin.
	(_GLIBCXX_HAVE_BUILTIN_HAS_UNIQ_OBJ_REP)
	(_GLIBCXX_HAVE_BUILTIN_IS_AGGREGATE)
	(_GLIBCXX_HAVE_BUILTIN_IS_CONSTANT_EVALUATED)
	(_GLIBCXX_HAVE_BUILTIN_IS_SAME, _GLIBCXX_HAVE_BUILTIN_LAUNDER):
	Define using _GLIBCXX_HAS_BUILTIN.

2020-12-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_istream/get/char/lwg3464.cc: Add
	dg-timeout-factor directive.
	* testsuite/27_io/basic_istream/get/wchar_t/lwg3464.cc:
	Likewise.

2020-12-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98003
	* testsuite/27_io/basic_syncbuf/sync_ops/1.cc: Add options for
	libatomic.

2020-11-30  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (INPUT): Add <latch> and <semaphore>.

2020-11-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp (libstdc++_init): Reduce
	default tool_timeout to 360.

2020-11-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/specialized_algorithms/pstl/*: Add
	dg-timeout-factor.
	* testsuite/25_algorithms/pstl/*: Likewise.
	* testsuite/26_numerics/pstl/*: Likewise.
	* testsuite/28_regex/*: Likewise.

2020-11-29  John David Anglin  <danglin@gcc.gnu.org>

	* configure: Regenerate.

2020-11-27  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp (v3_try_preprocess): Define
	new proc to preprocess a chunk of code.
	(v3_check_preprocessor_condition): Define new proc to test
	a preprocessor condition depending on GCC or libstdc++ macros.
	(check_v3_target_debug_mode, check_v3_target_normal_mode):
	Use v3_try_preprocess.
	(check_v3_target_normal_namespace)
	(check_v3_target_parallel_mode, check_v3_target_cstdint)
	(check_v3_target_cmath, check_v3_target_atomic_builtins)
	(check_v3_target_gthreads, check_v3_target_gthreads_timed)
	(check_v3_target_sleep, check_v3_target_sched_yield)
	(check_v3_target_string_conversions, check_v3_target_swprintf)
	(check_v3_target_binary_io, check_v3_target_nprocs): Use
	v3_check_preprocessor_condition.
	(check_effective_target_cxx11): Likewise.
	(check_effective_target_random_device): Likewise.
	(check_effective_target_tbb-backend): Likewise.
	(check_effective_target_futex): Likewise.
	(check_v3_target_little_endian) Call check_effective_target_le.
	(check_effective_target_atomic-builtins): New proc to define
	new effective-target keyword.
	(check_effective_target_gthreads-timed): Likewise.

2020-11-27  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/operations/absolute.cc: Avoid
	-Wrange-loop-construct warning.
	* testsuite/27_io/filesystem/path/append/source.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/parent_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/relative_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/itr/traversal.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/remove_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/nonmember/append.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/cmp.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/cmp_c++20.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/nonmember/hash_value.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_parent_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_relative_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_name.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_stem.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/is_relative.cc: Likewise.
	* testsuite/experimental/filesystem/operations/absolute.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/assign/copy.cc: Likewise.
	* testsuite/experimental/filesystem/path/compare/path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/construct/copy.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/extension.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/parent_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/relative_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/root_directory.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/decompose/root_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/itr/traversal.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/modifiers/remove_filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/modifiers/replace_extension.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/modifiers/replace_filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/nonmember/hash_value.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_extension.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_filename.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_parent_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_relative_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_root_directory.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_root_name.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_root_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/has_stem.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/query/is_relative.cc:
	Likewise.

2020-11-27  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++98/locale.cc (locale::facet::_S_get_c_locale()):
	Revert change to use __is_single_threaded.
	* src/c++98/locale_init.cc (locale::_S_initialize()):
	Likewise.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_wait.h (_GLIBCXX_HAVE_ATOMIC_WAIT):
	Define.
	* include/bits/atomic_base.h: Check _GLIBCXX_HAVE_ATOMIC_WAIT.
	* include/bits/atomic_timed_wait.h: Likewise.
	* include/bits/semaphore_base.h: Likewise.
	* include/std/atomic: Likewise.
	* include/std/latch: Likewise.
	* include/std/semaphore: Likewise.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/latch: Depend on _GLIBCXX_HAS_GTHREADS and
	_GLIBCXX_HAVE_LINUX_FUTEX.
	* include/std/version (__cpp_lib_latch): Define conditionally.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp (check_effective_target_gthreads):
	Call check_v3_target_gthreads not check_v3_target_gthreads_timed.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/28_regex/algorithms/regex_match/basic/string_range_01_03.cc:
	Add dg-timeout-factor directive.
	* testsuite/28_regex/algorithms/regex_match/cstring_bracket_01.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/char/backref.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/wchar_t/63199.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/wchar_t/anymatcher.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/wchar_t/cjk_match.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/ecma/wchar_t/hex.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_match/extended/wstring_locale.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_search/61720.cc: Likewise.
	* testsuite/28_regex/algorithms/regex_search/ecma/assertion.cc:
	Likewise.
	* testsuite/28_regex/algorithms/regex_search/ecma/string_01.cc:
	Likewise.
	* testsuite/28_regex/basic_regex/ctors/deduction.cc: Likewise.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp (libstdc++_init): Only set
	tool_timeout if it hasn't been set by the user already.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97936
	* testsuite/29_atomics/atomic/wait_notify/bool.cc: Fix missed
	notifications by making the new thread wait until the parent
	thread is waiting on the condition variable.
	* testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
	* testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
	* testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/96817.cc: Use new effective-target
	keywords to select supported targets more effectively.
	* testsuite/30_threads/call_once/66146.cc: Likewise.
	* testsuite/lib/libstdc++.exp (check_effective_target_futex):
	Define new proc.
	(check_effective_target_gthreads): Define new proc to replace
	dg-require-gthreads.

2020-11-26  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Remove libposix4
	references.
	<solaris*>: Don't use -lrt any longer.
	* configure: Regenerate.
	* doc/xml/manual/configure.xml (--enable-libstdcxx-time=OPTION):
	Remove libposix4 reference.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98001
	* testsuite/ext/stdio_filebuf/char/79820.cc: Do not pass invalid
	FILE* to constructor.

2020-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/precompiled/stdc++.h: Add new headers.
	* include/std/stop_token: Include <semaphore> unconditionally.

2020-11-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_timed_wait.h (__cond_wait_until): Do not
	perform redundant conversions to the same clock.

2020-11-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_timed_wait.h (__cond_wait_until_impl):
	Do not define when _GLIBCXX_HAVE_LINUX_FUTEX is defined. Use
	__condvar and mutex instead of __gthread_cond_t and
	unique_lock<mutex>.
	(__cond_wait_until): Likewise. Fix test for return value of
	__cond_wait_until_impl.
	(__timed_waiters::_M_do_wait_until): Use __condvar instead
	of __gthread_cond_t.
	* include/bits/atomic_wait.h: Remove <bits/unique_lock.h>
	include. Only include <bits/std_mutex.h> if not using futexes.
	(__platform_wait_max_value): Remove unused variable.
	(__waiters::lock_t): Use lock_guard instead of unique_lock.
	(__waiters::_M_cv): Use __condvar instead of __gthread_cond_t.
	(__waiters::_M_do_wait(__platform_wait_t)): Likewise.
	(__waiters::_M_notify()): Likewise. Use notify_one() if not
	asked to notify all.
	* include/bits/std_mutex.h (__condvar): New type.
	* include/std/condition_variable (condition_variable::_M_cond)
	(condition_variable::wait_until): Use __condvar instead of
	__gthread_cond_t.
	* src/c++11/condition_variable.cc (condition_variable): Define
	default constructor and destructor as defaulted.
	(condition_variable::wait, condition_variable::notify_one)
	(condition_variable::notify_all): Forward to corresponding
	member function of __condvar.

2020-11-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97936
	* testsuite/29_atomics/atomic/wait_notify/bool.cc: Re-eneable
	test.
	* testsuite/29_atomics/atomic/wait_notify/generic.cc: Likewise.
	* testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
	* testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/wait_notify.cc: Likewise.
	* testsuite/util/atomic/wait_notify_util.h: Fix missed
	notifications by making the new thread wait until the parent
	thread is waiting on the condition variable.

2020-11-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97935
	* include/bits/iterator_concepts.h (__detail::__iter_without_category):
	New helper concept.
	(__iterator_traits::__cat): Use __detail::__iter_without_category.
	* testsuite/24_iterators/associated_types/iterator.traits.cc: New test.

2020-11-25  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/names.cc: Do not test 'v' on AIX.

2020-11-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97936
	* include/bits/atomic_wait.h (__platform_wait): Check errno,
	not just the value of EAGAIN.
	(__waiters::__waiters()): Fix name of data member.

2020-11-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97936
	* include/bits/atomic_wait.h (__platform_wait): Return if futex
	sets EAGAIN.
	* testsuite/30_threads/latch/3.cc: Re-enable test.
	* testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.

2020-11-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97936
	PR libstdc++/97944
	* testsuite/29_atomics/atomic_integral/wait_notify.cc: Disable.
	Do not require pthreads, but add -pthread when appropriate.
	* testsuite/30_threads/jthread/95989.cc: Likewise.
	* testsuite/30_threads/latch/3.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.

2020-11-24  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/jthread/95989.cc: Run all three test
	functions, not just the first one twice.

2020-11-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/67791
	* src/c++11/thread.cc (thread::_M_start_thread(_State_ptr, void (*)())):
	Check that gthreads is available before calling __gthread_create.

2020-11-24  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++98/locale.cc (locale::facet::_S_get_c_locale())
	(locale::id::_M_id() const): Use __is_single_threaded.
	* src/c++98/locale_init.cc (locale::_S_initialize()):
	Likewise.

2020-11-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/semaphore_base.h
	(__platform_semaphore::_M_try_acquire_until): Fix type of
	variable.

2020-11-23  Stephan Bergmann  <sbergman@redhat.com>

	* include/bits/atomic_wait.h (__thread_relax, __thread_yield):
	Add 'inline'.

2020-11-23  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_CHECK_GTHREADS): Check for
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/bits/semaphore_base.h (_GLIBCXX_HAVE_POSIX_SEMAPHORE):
	Check autoconf macro instead of defining it here.

2020-11-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_wait.h: Do not define anything unless
	gthreads or futexes are available.
	* include/bits/atomic_timed_wait.h: Likewise.
	* include/bits/semaphore_base.h: Likewise.
	* include/std/semaphore: Likewise.
	* include/bits/atomic_base.h (atomic_flag::wait)
	(atomic_flag::notify_one, atomic_flag::notify_all)
	(__atomic_base<I>::wait, __atomic_base<I>::notify_one)
	(__atomic_base<I>::notify_all, __atomic_base<P*>::wait)
	(__atomic_base<P*>::notify_one, __atomic_base<P*>::notify_all)
	(__atomic_impl::wait, __atomic_impl::notify_one)
	(__atomic_impl::notify_all, __atomic_float::wait)
	(__atomic_float::notify_one, __atomic_float::notify_all)
	(__atomic_ref::wait, __atomic_ref::notify_one)
	(__atomic_ref::notify_all): Only define if gthreads or futexes
	are available.
	* include/std/atomic (atomic::wait, atomic::notify_one)
	(atomic::notify_all): Likewise.
	* include/std/version (__cpp_lib_semaphore): Define
	conditionally.

2020-11-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97948
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Add options
	for libatomic.
	* testsuite/29_atomics/atomic_integral/wait_notify.cc: Likewise.
	* testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.

2020-11-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_base.h (atomic_flag::wait): Use correct
	type for __atomic_wait call.
	* include/bits/atomic_timed_wait.h (__atomic_wait_until): Check
	_GLIBCXX_HAVE_LINUX_FUTEX.
	* include/bits/atomic_wait.h (__atomic_notify): Likewise.
	* include/bits/semaphore_base.h (_GLIBCXX_HAVE_POSIX_SEMAPHORE):
	Only define if SEM_VALUE_MAX or _POSIX_SEM_VALUE_MAX is defined.
	* testsuite/29_atomics/atomic/wait_notify/bool.cc: Disable on
	non-linux targes.
	* testsuite/29_atomics/atomic/wait_notify/generic.cc: Likewise.
	* testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
	* testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.

2020-11-20  Thomas Rodgers  <trodgers@redhat.com>

	* include/Makefile.am (bits_headers): Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/atomic_base.h (__atomic_flag::wait): Define.
	(__atomic_flag::notify_one): Likewise.
	(__atomic_flag::notify_all): Likewise.
	(__atomic_base<_Itp>::wait): Likewise.
	(__atomic_base<_Itp>::notify_one): Likewise.
	(__atomic_base<_Itp>::notify_all): Likewise.
	(__atomic_base<_Ptp*>::wait): Likewise.
	(__atomic_base<_Ptp*>::notify_one): Likewise.
	(__atomic_base<_Ptp*>::notify_all): Likewise.
	(__atomic_impl::wait): Likewise.
	(__atomic_impl::notify_one): Likewise.
	(__atomic_impl::notify_all): Likewise.
	(__atomic_float<_Fp>::wait): Likewise.
	(__atomic_float<_Fp>::notify_one): Likewise.
	(__atomic_float<_Fp>::notify_all): Likewise.
	(__atomic_ref<_Tp>::wait): Likewise.
	(__atomic_ref<_Tp>::notify_one): Likewise.
	(__atomic_ref<_Tp>::notify_all): Likewise.
	(atomic_wait<_Tp>): Likewise.
	(atomic_wait_explicit<_Tp>): Likewise.
	(atomic_notify_one<_Tp>): Likewise.
	(atomic_notify_all<_Tp>): Likewise.
	* include/bits/atomic_wait.h: New file.
	* include/bits/atomic_timed_wait.h: New file.
	* include/bits/semaphore_base.h: New file.
	* include/std/atomic (atomic<bool>::wait): Define.
	(atomic<bool>::wait_one): Likewise.
	(atomic<bool>::wait_all): Likewise.
	(atomic<_Tp>::wait): Likewise.
	(atomic<_Tp>::wait_one): Likewise.
	(atomic<_Tp>::wait_all): Likewise.
	(atomic<_Tp*>::wait): Likewise.
	(atomic<_Tp*>::wait_one): Likewise.
	(atomic<_Tp*>::wait_all): Likewise.
	* include/std/latch: New file.
	* include/std/semaphore: New file.
	* include/std/version: Add __cpp_lib_semaphore and
	__cpp_lib_latch defines.
	* testsuite/29_atomics/atomic/wait_notify/bool.cc: New test.
	* testsuite/29_atomics/atomic/wait_notify/pointers.cc: Likewise.
	* testsuite/29_atomics/atomic/wait_notify/generic.cc: Liekwise.
	* testsuite/29_atomics/atomic_flag/wait_notify/1.cc: Likewise.
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/wait_notify.cc: Likewise.
	* testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.
	* testsuite/30_threads/semaphore/1.cc: New test.
	* testsuite/30_threads/semaphore/2.cc: Likewise.
	* testsuite/30_threads/semaphore/least_max_value_neg.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire_for.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire_posix.cc: Likewise.
	* testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.
	* testsuite/30_threads/latch/1.cc: New test.
	* testsuite/30_threads/latch/2.cc: New test.
	* testsuite/30_threads/latch/3.cc: New test.
	* testsuite/util/atomic/wait_notify_util.h: New File.

2020-11-20  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/83938
	* include/bits/stl_tempbuf.h (get_temporary_buffer): Change __len
	computation in the loop to avoid truncation.
	* include/bits/stl_algo.h:
	(__inplace_merge): Take temporary buffer length from smallest range.
	(__stable_sort): Limit temporary buffer length.
	* testsuite/25_algorithms/inplace_merge/1.cc (test4): New.
	* testsuite/performance/25_algorithms/stable_sort.cc: Test stable_sort
	under different heap memory conditions.
	* testsuite/performance/25_algorithms/inplace_merge.cc: New test.

2020-11-20  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/move.h (_GLIBCXX_FWDREF): New.
	* include/bits/stl_tree.h: Adapt to use latter.
	(_Rb_tree<>::_M_clone_node): Add _MoveValue template parameter.
	(_Rb_tree<>::_M_mbegin): New.
	(_Rb_tree<>::_M_begin): Use latter.
	(_Rb_tree<>::_M_copy): Add _MoveValues template parameter.
	* testsuite/23_containers/map/allocator/move_cons.cc: New test.
	* testsuite/23_containers/multimap/allocator/move_cons.cc: New test.
	* testsuite/23_containers/multiset/allocator/move_cons.cc: New test.
	* testsuite/23_containers/set/allocator/move_cons.cc: New test.

2020-11-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92546
	* include/std/regex (pmr::smatch, pmr::wsmatch): Declare using
	underlying __normal_iterator type, not nested typedef
	basic_string::const_iterator.

2020-11-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95989
	* config/os/gnu-linux/os_defines.h (_GLIBCXX_NATIVE_THREAD_ID):
	Define new macro to get reliable thread ID.
	* include/bits/std_thread.h: (this_thread::get_id): Use new
	macro if it's defined.
	* testsuite/30_threads/jthread/95989.cc: New test.
	* testsuite/30_threads/this_thread/95989.cc: New test.

2020-11-19  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/async/async.cc: Include <thread>.
	* testsuite/30_threads/future/members/93456.cc: Likewise.

2020-11-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92546
	* include/Makefile.am: Add new <bits/std_thread.h> header.
	* include/Makefile.in: Regenerate.
	* include/std/future: Include new header instead of <thread>.
	* include/std/stop_token: Include new header instead of
	<bits/gthr.h>.
	(stop_token::_S_yield()): Use this_thread::yield().
	(_Stop_state_t::_M_requester): Change type to std::thread::id.
	(_Stop_state_t::_M_request_stop()): Use this_thread::get_id().
	(_Stop_state_t::_M_remove_callback(_Stop_cb*)): Likewise.
	Use __is_single_threaded() to decide whether to synchronize.
	* include/std/thread (thread, operator==, this_thread::get_id)
	(this_thread::yield): Move to new header.
	(operator<=>, operator!=, operator<, operator<=, operator>)
	(operator>=, hash<thread::id>, operator<<): Define even when
	gthreads not available.
	* src/c++11/thread.cc: Include <memory>.
	* include/bits/std_thread.h: New file.
	(thread, operator==, this_thread::get_id, this_thread::yield):
	Define even when gthreads not available.
	[!_GLIBCXX_HAS_GTHREADS] (thread::join, thread::detach)
	(thread::hardware_concurrency): Define inline.

2020-11-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93421
	PR libstdc++/93456
	* src/c++11/futex.cc (syscall_time_t): New typedef for
	the type of the syscall_timespec::tv_sec member.
	(relative_timespec, _M_futex_wait_until)
	(_M_futex_wait_until_steady): Use syscall_time_t in overflow
	checks, not time_t.

2020-11-18  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (join_view::_Iterator::_M_satisfy): Uglify
	local variable inner.
	(join_view::_Iterator::operator->): Use _Inner_iter instead of
	_Outer_iter in the function signature as per LWG 3500.
	* testsuite/std/ranges/adaptors/join.cc (test08): Test it.

2020-11-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93421
	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Fail if struct
	timespec isn't compatible with SYS_clock_gettime.
	* configure: Regenerate.
	* src/c++11/chrono.cc: Revert changes for time64 compatibility.
	Add static_assert instead.
	* src/c++11/futex.cc (_M_futex_wait_until_steady): Assume
	SYS_clock_gettime can use struct timespec.

2020-11-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97869
	* include/precompiled/stdc++.h: Include <coroutine>.
	* include/std/version (__cpp_lib_span): Check __cpp_lib_concepts
	before defining.

2020-11-17  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/97828
	* include/bits/ranges_algo.h (__search_n_fn::operator()): Check
	random_access_iterator before using the backtracking
	implementation.  When the backwards scan fails prematurely,
	reset __remainder appropriately.
	* testsuite/25_algorithms/search_n/97828.cc: New test.

2020-11-16  Jonathan Wakely  <jwakely@redhat.com>

	* src/Makefile.am (libstdc++-symbols.ver-sun): Remove -lrt from
	arguments passed to make_sunver.pl script.
	* src/Makefile.in: Regenerate.

2020-11-15  Jason Merrill  <jason@redhat.com>

	* testsuite/20_util/result_of/sfinae_friendly_1.cc: Adjust.

2020-11-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93421
	* src/c++11/chrono.cc [_GLIBCXX_USE_CLOCK_GETTIME_SYSCALL]
	(syscall_timespec): Define a type suitable for SYS_clock_gettime
	calls.
	(system_clock::now(), steady_clock::now()): Use syscall_timespec
	instead of timespec.
	* src/c++11/futex.cc (syscall_timespec): Define a type suitable
	for SYS_futex and SYS_clock_gettime calls.
	(relative_timespec): Use syscall_timespec instead of timespec.
	(__atomic_futex_unsigned_base::_M_futex_wait_until): Likewise.
	(__atomic_futex_unsigned_base::_M_futex_wait_until_steady):
	Likewise.

2020-11-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93456
	* src/c++11/futex.cc (relative_timespec): Remove redundant check
	negative values.
	* testsuite/30_threads/future/members/wait_until_overflow.cc: Moved to...
	* testsuite/30_threads/future/members/93456.cc: ...here.

2020-11-13  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/futex.cc (relative_timespec): Add [[unlikely]]
	attributes.
	(__atomic_futex_unsigned_base::_M_futex_wait_until)
	(__atomic_futex_unsigned_base::_M_futex_wait_until_steady):
	Check for overflow.
	* testsuite/30_threads/future/members/wait_until_overflow.cc:
	New test.

2020-11-13  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/futex.cc (relative_timespec): New function to
	create relative time from two absolute times.
	(__atomic_futex_unsigned_base::_M_futex_wait_until)
	(__atomic_futex_unsigned_base::_M_futex_wait_until_steady):
	Use relative_timespec.

2020-11-13  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/future/members/poll.cc: Require gthreads
	and add -pthread for targets that require it. Relax required
	ratio of wait_for calls before/after the future is ready.

2020-11-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/future (future::wait_for): Do not wait for
	durations less than or equal to zero.
	* src/c++11/futex.cc (_M_futex_wait_until)
	(_M_futex_wait_until_steady): Do not wait for timeouts before
	the epoch.
	* testsuite/30_threads/future/members/poll.cc: New test.

2020-11-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/numeric_traits.h (__numeric_traits): Change
	primary template to always derive from __numeric_traits_integer.
	(__numeric_traits<float>, __numeric_traits<double>)
	(__numeric_traits<long double>): Add explicit specializations.

2020-11-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97798
	* include/ext/numeric_traits.h (__glibcxx_signed)
	(__glibcxx_digits, __glibcxx_min, __glibcxx_max): Remove
	macros.
	(__is_integer_nonstrict::__width): Define new constant.
	(__numeric_traits_integer): Define constants in terms of each
	other and __is_integer_nonstrict::__width, rather than the
	removed macros.
	(_GLIBCXX_INT_N_TRAITS): Macro to define explicit
	specializations for non-standard integer types.

2020-11-11  Jonathan Yong  <10walls@gmail.com>

	* acinclude.m4 (GLIBCXX_CHECK_LINKER_FEATURES): Exclude
	cygwin and mingw from relro linker test.
	* configure: Regenerate.

2020-11-11  Paul Scharnofske  <asynts@gmail.com>

	* include/std/thread (jthread::operator=(jthread&&)): Transfer
	any existing state to a temporary that will request a stop and
	then join.
	* testsuite/30_threads/jthread/jthread.cc: Test move assignment.

2020-11-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stop_token (_Stop_state_t::_M_requester): Define
	new struct with members to store and check the thread ID.
	(_Stop_state_t::_M_request_stop()): Use _M_requester._M_set().
	(_Stop_state_t::_M_remove_callback(_Stop_cb*)): Use
	_M_requester._M_is_current_thread().

2020-11-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ostream (__syncbuf_base): New class template.
	(emit_on_flush, noemit_on_flush, flush_emit): New manipulators.
	* include/std/syncstream (basic_syncbuf): Derive from
	__syncbuf_base instead of basic_streambuf.
	(basic_syncbuf::operator=): Remove self-assignment check.
	(basic_syncbuf::swap): Remove self-swap check.
	(basic_syncbuf::emit): Do not skip pubsync() call if sequence
	is empty.
	(basic_syncbuf::sync): Remove no-op pubsync on stringbuf.
	(basic_syncbuf::overflow): Define override.
	* testsuite/27_io/basic_syncstream/basic_ops/1.cc: Test
	basic_osyncstream::put(char_type).
	* testsuite/27_io/basic_ostream/emit/1.cc: New test.

2020-11-10  Jonathan Wakely  <jwakely@redhat.com>

	* config/locale/generic/c_locale.cc (__set_C_locale()): New function
	to set the "C" locale and return the name of the previous locale.
	(__convert_to_v<float>, __convert_to_v<double>)
	(__convert_to_v<long double>): Use __set_C_locale and set failbit on
	error.

2020-11-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/sstream (basic_stringbug, basic_istringstream)
	(basic_ostringstream, basic_stringstream): Reorder C++20
	constructors to be declared next to other constructors.

2020-11-10  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Tighten patterns.
	(GLIBCXX_3.4.29): Export new symbols.
	* include/bits/alloc_traits.h (__allocator_like): New concept.
	* include/std/sstream (basic_stringbuf::swap): Add exception
	specification.
	(basic_stringbuf::str() const): Add ref-qualifier. Use new
	_M_high_mark function.
	(basic_stringbuf::str(const SAlloc&) const): Define new function.
	(basic_stringbuf::str() &&): Likewise.
	(basic_stringbuf::str(const basic_string<C,T,SAlloc>&)):
	Likewise.
	(basic_stringbuf::str(basic_string<C,T,Alloc>&&)): Likewise.
	(basic_stringbuf::view() const): Use _M_high_mark.
	(basic_istringstream::str, basic_ostringstream::str)
	(basic_stringstream::str): Define new overloads.
	* src/c++20/sstream-inst.cc (basic_stringbuf::str)
	(basic_istringstream::str, basic_ostringstream::str)
	(basic_stringstream::str): Explicit instantiation definitions
	for new overloads.
	* testsuite/27_io/basic_istringstream/view/char/1.cc: Add more
	checks.
	* testsuite/27_io/basic_istringstream/view/wchar_t/1.cc:
	Likewise.
	* testsuite/27_io/basic_ostringstream/view/char/1.cc:
	Likewise.
	* testsuite/27_io/basic_ostringstream/view/wchar_t/1.cc:
	Likewise.
	* testsuite/27_io/basic_stringstream/view/char/1.cc:
	Likewise.
	* testsuite/27_io/basic_stringstream/view/wchar_t/1.cc:
	Likewise.
	* testsuite/27_io/basic_istringstream/str/char/2.cc: New test.
	* testsuite/27_io/basic_istringstream/str/wchar_t/2.cc: New test.
	* testsuite/27_io/basic_ostringstream/str/char/3.cc: New test.
	* testsuite/27_io/basic_ostringstream/str/wchar_t/3.cc: New test.
	* testsuite/27_io/basic_stringbuf/str/char/4.cc: New test.
	* testsuite/27_io/basic_stringbuf/str/wchar_t/4.cc: New test.
	* testsuite/27_io/basic_stringstream/str/char/5.cc: New test.
	* testsuite/27_io/basic_stringstream/str/wchar_t/5.cc.cc: New test.

2020-11-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97415
	* include/std/sstream (basic_stringbuf::_M_update_egptr)
	(basic_stringbuf::__xfer_bufptrs::__xfer_bufptrs): Check for
	null before comparing pointers.

2020-11-09  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/array: Remove.
	* include/Makefile.am: Remove <debug/array>.
	* include/Makefile.in: Regenerate.
	* include/experimental/functional: Adapt.
	* include/std/array: Move to _GLIBCXX_INLINE_VERSION namespace.
	* include/std/functional: Adapt.
	* include/std/span: Adapt.
	* testsuite/23_containers/array/debug/back1_neg.cc:
	Remove dg-require-debug-mode. Add -D_GLIBCXX_ASSERTIONS option.
	* testsuite/23_containers/array/debug/back2_neg.cc: Likewise.
	* testsuite/23_containers/array/debug/front1_neg.cc: Likewise.
	* testsuite/23_containers/array/debug/front2_neg.cc: Likewise.
	* testsuite/23_containers/array/debug/square_brackets_operator1_neg.cc:
	Likewise.
	* testsuite/23_containers/array/debug/square_brackets_operator2_neg.cc:
	Likewise.
	* testsuite/23_containers/array/element_access/60497.cc
	* testsuite/23_containers/array/tuple_interface/get_debug_neg.cc:
	Remove.
	* testsuite/23_containers/array/tuple_interface/get_neg.cc
	* testsuite/23_containers/array/tuple_interface/tuple_element_debug_neg.cc
	* testsuite/23_containers/array/tuple_interface/tuple_element_neg.cc

2020-11-09  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/assertions.h (__glibcxx_requires_non_empty_range):
	Remove __builtin_expect.
	(__glibcxx_requires_subscript): Likewise.
	(__glibcxx_requires_nonempty): Likewise.
	* include/debug/formatter.h (__check_singular): Add C++11 constexpr
	qualification.
	* include/debug/helper_functions.h (__check_singular): Likewise. Skip
	check if constant evaluated.
	(__valid_range): Do not skip check if constant evaluated.
	* include/debug/macros.h (_GLIBCXX_DEBUG_VERIFY_COND_AT): Add
	__builtin_expect.
	(_GLIBCXX_DEBUG_VERIFY_AT_F): Use __glibcxx_assert_1.
	* testsuite/21_strings/basic_string_view/element_access/char/back_constexpr_neg.cc:
	New test.
	* testsuite/21_strings/basic_string_view/element_access/char/constexpr.cc: New test.
	* testsuite/21_strings/basic_string_view/element_access/char/constexpr_neg.cc: New test.
	* testsuite/21_strings/basic_string_view/element_access/char/front_back_constexpr.cc:
	New test.
	* testsuite/21_strings/basic_string_view/element_access/char/front_constexpr_neg.cc:
	New test.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/back_constexpr_neg.cc:
	New test.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr.cc: New test.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr_neg.cc: New test.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/front_constexpr_neg.cc:
	New test.
	* testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_neg.cc: New test.
	* testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_pred_neg.cc: New test.
	* testsuite/25_algorithms/lower_bound/debug/constexpr_valid_range_neg.cc: New test.
	* testsuite/25_algorithms/lower_bound/debug/partitioned_neg.cc: New test.
	* testsuite/25_algorithms/lower_bound/debug/partitioned_pred_neg.cc: New test.
	* testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_neg.cc: New test.
	* testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_pred_neg.cc: New test.
	* testsuite/25_algorithms/upper_bound/debug/constexpr_valid_range_neg.cc: New test.
	* testsuite/25_algorithms/upper_bound/debug/partitioned_neg.cc: New test.
	* testsuite/25_algorithms/upper_bound/debug/partitioned_pred_neg.cc: New test.

2020-11-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/uniform_int_dist.h (__detail::_Power_of_2):
	Document that true result for zero is intentional.

2020-11-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/bit (__popcount): Remove redundant check for zero.

2020-11-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97729
	* libsupc++/exception_ptr.h (exception_ptr::exception_ptr())
	(exception_ptr::exception_ptr(const exception_ptr&))
	(exception_ptr::~exception_ptr()): Remove 'always_inline'
	attributes. Use 'inline' unconditionally.

2020-11-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97758
	* include/bits/std_function.h [!__cpp_rtti]: Include <typeinfo>.

2020-11-07  Liu Hao  <lh_mouse@126.com>

	* libsupc++/cxxabi.h: (__cxa_atexit): mark with _GLIBCXX_CDTOR_CALLABI
	(__cxa_thread_atexit): ditto
	* libsupc++/atexit_thread.cc: (__cxa_atexit): mark with
	_GLIBCXX_CDTOR_CALLABI
	(__cxa_thread_atexit): ditto
	(elt): ditto

2020-11-06  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Tighten up patterns
	for basic_stringbuf that refer to __xfer_bufptrs.

2020-11-05  Marek Polacek  <polacek@redhat.com>

	PR c++/25814
	* testsuite/20_util/reference_wrapper/lwg2993.cc: Add a dg-warning.
	* testsuite/25_algorithms/generate_n/87982_neg.cc: Likewise.

2020-11-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96269
	* include/std/optional (operator==, operator!=, operator<)
	(operator>, operator<=, operator>=): Fix types used in
	SFINAE constraints.
	* testsuite/20_util/optional/relops/96269.cc: New test.

2020-11-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97731
	* src/filesystem/dir.cc (recursive_directory_iterator): Call the
	right overload of _Dir::advance.
	* testsuite/experimental/filesystem/iterators/97731.cc: New test.

2020-11-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97729
	* include/std/future (__basic_future::_M_get_result): Use
	nullptr for null pointer constant.
	* libsupc++/eh_ptr.cc (operator==, operator!=): Remove
	definitions.
	* libsupc++/exception_ptr.h (_GLIBCXX_EH_PTR_USED): Define
	macro to conditionally add __attribute__((__used__)).
	(operator==, operator!=, exception_ptr::exception_ptr())
	(exception_ptr::exception_ptr(const exception_ptr&))
	(exception_ptr::~exception_ptr())
	(exception_ptr::operator=(const exception_ptr&))
	(exception_ptr::swap(exception_ptr&)): Always define as
	inline. Add macro to be conditionally "used".

2020-11-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97729
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): Add exports.
	* src/c++20/sstream-inst.cc (basic_stringbuf): Instantiate
	private constructor taking __xfer_bufptrs.

2020-11-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/sstream (basic_stringbuf(const allocator_type&):
	Add explicit.
	(basic_stringbuf(const basic_string<C,T,SA>&, openmode, const A&)):
	Call _M_stringbuf_init. Construct _M_string from pointer and length
	to avoid constraint checks for string view.
	(basic_stringbuf::view()): Make __sv_type alias local to the
	function.
	(basic_istringstream(const basic_string<C,T,SA>&, openmode, const A&)):
	Pass string to _M_streambuf instead of constructing a temporary
	with the wrong allocator.
	(basic_ostringstream(const basic_string<C,T,SA>&, openmode, const A&)):
	Likewise.
	(basic_stringstream(const basic_string<C,T,SA>&, openmode, const A&)):
	Likewise.
	* src/c++20/sstream-inst.cc: Use string_view and wstring_view
	typedefs in explicit instantiations.
	* testsuite/27_io/basic_istringstream/cons/char/1.cc: Add more
	tests for constructors.
	* testsuite/27_io/basic_ostringstream/cons/char/1.cc: Likewise.
	* testsuite/27_io/basic_stringbuf/cons/char/1.cc: Likewise.
	* testsuite/27_io/basic_stringbuf/cons/char/2.cc: Likewise.
	* testsuite/27_io/basic_stringbuf/cons/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_stringbuf/cons/wchar_t/2.cc: Likewise.
	* testsuite/27_io/basic_stringstream/cons/char/1.cc: Likewise.

2020-11-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/sstream: Adjust whitespace.

2020-11-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97719
	* include/std/sstream (basic_stringstream(string_type&&, openmode)):
	Fix default argument.
	* testsuite/27_io/basic_stringstream/cons/char/97719.cc: New test.

2020-11-04  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/96817.cc: Fail fast if the library is
	configured to not use futexes.

2020-11-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94971
	* include/bits/stl_algo.h (search(FIter, FIter, const Searcher):
	Adjust #if condition.
	* include/parallel/algo.h (search(FIter, FIter, const Searcher&):
	Define new overload for C++17.

2020-11-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92285
	* doc/xml/manual/evolution.xml: Document change to base class.
	* doc/html/manual/api.html: Regenerate.

2020-11-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/uniform_int_dist.h (uniform_int_distribution::_S_nd):
	Use qualified-id to refer to static member functions.

2020-11-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/syncstream: Include <bits/std_mutex.h>
	unconditionally.

2020-11-03  François Dumont  <fdumont@gcc.gnu.org>

	* config/abi/pre/gnu-versioned-namespace.ver:
	Add __istream_extract and _Safe_local_iterator_base::_M_attach_single
	symbols.

2020-11-03  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/mutex.cc [_GLIBCXX_HAVE_TLS] (__once_proxy): Define
	separately for TLS targets.
	[!_GLIBCXX_HAVE_TLS] (__get_once_functor_lock_ptr): Replace with ...
	(set_lock_ptr): ... this. Set new value and return previous
	value.
	[!_GLIBCXX_HAVE_TLS] (__set_once_functor_lock_ptr): Adjust to
	use set_lock_ptr.
	[!_GLIBCXX_HAVE_TLS] (__once_proxy): Likewise.

2020-11-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/55394
	PR libstdc++/66146
	PR libstdc++/84323
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): Add new symbols.
	* include/std/mutex [!_GLIBCXX_HAS_GTHREADS] (once_flag): Define
	even when gthreads is not supported.
	(once_flag::_M_once) [_GLIBCXX_HAVE_LINUX_FUTEX]: Change type
	from __gthread_once_t to int.
	(once_flag::_M_passive(), once_flag::_M_activate())
	(once_flag::_M_finish(bool), once_flag::_Active_execution):
	Define new members for futex and non-threaded implementation.
	[_GLIBCXX_HAS_GTHREADS] (once_flag::_Prepare_execution): New
	RAII helper type.
	(call_once): Use new members of once_flag.
	* src/c++11/mutex.cc (std::once_flag::_M_activate): Define.
	(std::once_flag::_M_finish): Define.
	* testsuite/30_threads/call_once/39909.cc: Do not require
	gthreads.
	* testsuite/30_threads/call_once/49668.cc: Likewise.
	* testsuite/30_threads/call_once/60497.cc: Likewise.
	* testsuite/30_threads/call_once/call_once1.cc: Likewise.
	* testsuite/30_threads/call_once/dr2442.cc: Likewise.
	* testsuite/30_threads/call_once/once_flag.cc: Add test for
	constexpr constructor.
	* testsuite/30_threads/call_once/66146.cc: New test.
	* testsuite/30_threads/call_once/constexpr.cc: Removed.
	* testsuite/30_threads/once_flag/cons/constexpr.cc: Removed.

2020-11-03  Jonathan Yong  <10walls@gmail.com>

	* src/Makefile.am (libstdc___la_LINK): Add lt_host_flags.
	* src/Makefile.in: Regenerate.

2020-11-02  Thomas Rodgers  <trodgers@redhat.com>

	* doc/doxygen/user.cfg.in (INPUT): Add new header.
	* include/Makefile.am (std_headers): Add new header.
	* include/Makefile.in: Regenerate.
	* include/precompiled/stdc++.h: Include new header.
	* include/std/syncstream: New header.
	* include/std/version: Add __cpp_lib_syncbuf.
	* testsuite/27_io/basic_syncbuf/1.cc: New test.
	* testsuite/27_io/basic_syncbuf/2.cc: Likewise.
	* testsuite/27_io/basic_syncbuf/basic_ops/1.cc:
	Likewise.
	* testsuite/27_io/basic_syncbuf/requirements/types.cc:
	Likewise.
	* testsuite/27_io/basic_syncbuf/sync_ops/1.cc:
	Likewise.
	* testsuite/27_io/basic_syncstream/1.cc: Likewise.
	* testsuite/27_io/basic_syncstream/2.cc: Likewise.
	* testsuite/27_io/basic_syncstream/basic_ops/1.cc:
	Likewise.
	* testsuite/27_io/basic_syncstream/requirements/types.cc:
	Likewise.

2020-11-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (is_integral<wchar_t>)
	(make_unsigned<wchar_t>, make_signed<wchar_t>): Define based
	on #ifdef __WCHAR_TYPE__ instead of _GLIBCXX_USE_WCHAR_T.
	* include/bits/cpp_type_traits.h (__is_integer<wchar_t>)
	(__is_char<wchar_t>): Likewise.

2020-10-31  François Dumont  <fdumont@gcc.gnu.org>

	* src/c++17/floating_from_chars.cc (_GLIBCXX_USE_CX11_ABI): Add define.
	(buffering_string): New.
	[!_GLIBCXX_USE_CXX11_ABI](reserve_string): New.
	(from_chars): Adapt.
	* src/c++20/sstream-inst.cc: Limit instantiations to
	_GLIBCXX_USE_CXX11_ABI.

2020-10-31  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (independent_bit_engine): Fix typo
	in comment.
	(shuffle_order_engine): Fix incorrect description in comment.
	* include/bits/random.tcc (__representable_as_double
	(__p1_representable_as_double): New helper functions.
	(shuffle_order_engine::operator()): Use double for calculation
	if (max() - min() + 1) is representable as double.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line number.

2020-10-31  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96958
	* include/bits/hashtable_policy.h (_Prime_rehash_policy)
	(_Power2_rehash_policy): Use ceil and floor instead of ceill and
	floorl.
	* src/c++11/hashtable_c++0x.cc (_Prime_rehash_policy): Likewise.
	Use double instead of long double.

2020-10-31  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/97600
	* include/std/ranges (basic_istream_view::begin): Initialize
	_Iterator from 'this' instead of '*this'.
	(basic_istream_view::_Iterator::_Iterator): Adjust constructor
	accordingly.
	(filter_view::_Iterator::_Iterator): Take a filter_view*
	argument instead of a filter_view& argument.
	(filter_view::_Sentinel::_Sentinel): Likewise.
	(filter_view::begin): Initialize _Iterator from 'this' instead
	of '*this'.
	(filter_view::end): Likewise.
	(transform_view::_Iterator::_Iterator): Take a _Parent* instead
	of a _Parent&.
	(filter_view::_Iterator::operator+): Adjust accordingly.
	(filter_view::_Iterator::operator-): Likewise.
	(filter_view::begin): Initialize _Iterator from 'this' instead
	of '*this'.
	(filter_view::end): Likewise.
	(join_view::_Iterator): Take a _Parent* instead of a _Parent&.
	(join_view::_Sentinel): Likewise.
	(join_view::begin): Initialize _Iterator from 'this' instead of
	'*this'.
	(join_view::end): Initialize _Sentinel from 'this' instead of
	'*this'.
	(split_view::_OuterIter): Take a _Parent& instead of a _Parent*.
	(split_view::begin): Initialize _OuterIter from 'this' instead
	of '*this'.
	(split_view::end): Likewise.
	* testsuite/std/ranges/97600.cc: New test.

2020-10-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (enable_borrowed_view<take_view<T>>)
	(enable_borrowed_view<drop_view<T>>)
	(enable_borrowed_view<drop_while_view<T>>)
	(enable_borrowed_view<reverse_view<T>>)
	(enable_borrowed_view<common_view<T>>)
	(enable_borrowed_view<elements_view<T>>): Add partial
	specializations as per P2017R1.
	* testsuite/std/ranges/adaptors/conditionally_borrowed.cc:
	New test.

2020-10-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96958
	* include/bits/hashtable_policy.h (_Prime_rehash_policy)
	(_Power2_rehash_policy): Use double instead of long double.

2020-10-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/vector/bool/modifiers/insert/31370.cc:
	Avoid -Wcatch-value warnings.

2020-10-30  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (__detail::__box): For the partial
	specialization used by types that are already semiregular,
	make the default constructor value-initialize the underlying
	object instead of default-initializing it.  Make its in place
	constructor explicit.
	* testsuite/std/ranges/adaptors/detail/semiregular_box.cc:
	Augment test.

2020-10-30  David Edelsohn  <dje.gcc@gmail.com>

	* testsuite/20_util/unique_ptr/creation/for_overwrite.cc: XFAIL on AIX.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Tighten patterns
	for old <sstream> symbols some more.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_util.h (subrange::subrange(R&&)): Use
	direct-initialization instead of list-initialization, so a
	potential narrowing conversion from ranges::size(r) to the
	stored size isn't ill-formed.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/parse_numbers.h (_Select_int_base): Avoid
	narrowing conversion in constant expression.
	* include/experimental/buffer (buffer_copy): Avoid narrowing
	conversion.
	* include/experimental/internet (hash<>::operator()): Do not
	use deprecated 'argument_type' member.
	* include/std/variant (variant::emplace): Use cast instead
	of implicit conversion from size_t to narrower unsigned type.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/tr1/shared_ptr.h (__shared_count, __shared_ptr)
	(shared_ptr): Add diagnostic pragmas around uses of auto_ptr.
	* testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc:
	Adust dg-error line numbers.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/96817.cc: Avoid -Wunused warnings.
	* testsuite/20_util/any/assign/2.cc: Likewise.
	* testsuite/20_util/any/cons/2.cc: Likewise.
	* testsuite/20_util/align/1.cc: Avoid -Wsign-compare warning.
	* testsuite/20_util/function/65760.cc: Avoid -Wunused warning.
	* testsuite/20_util/function/1.cc: Avoid -Wcatch-value warning.
	* testsuite/20_util/function/cons/move_target.cc: Avoid -Wunused
	warning.
	* testsuite/20_util/headers/memory/synopsis.cc: Add exception
	specification.
	* testsuite/20_util/monotonic_buffer_resource/allocate.cc: Avoid
	-Wsign-compare warning.
	* testsuite/20_util/tuple/cons/deduction.cc: Avoid -Wunused
	warning.
	* testsuite/20_util/specialized_algorithms/uninitialized_copy/808590-cxx11.cc:
	Avoid -Wdeprecated-copy warning.
	* testsuite/21_strings/basic_string/56166.cc: Avoid
	-Wcatch-value warning.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stod.cc:
	Avoid -Wcatch-value warnings.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stof.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoi.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stol.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stold.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoll.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoul.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/char/stoull.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stod.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stof.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoi.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stol.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stold.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoll.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoul.cc:
	Likewise.
	* testsuite/21_strings/basic_string/numeric_conversions/wchar_t/stoull.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/char/nonnull.cc:
	Prune additional diagnostics.
	* testsuite/21_strings/basic_string_view/operations/find/char/nonnull.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/char/nonnull.cc:
	Likewise.
	* testsuite/21_strings/headers/string/synopsis.cc: Add exception
	specifications.
	* testsuite/22_locale/locale/cons/12352.cc: Define sized
	delete operators to avoid warnings.
	* testsuite/23_containers/deque/modifiers/swap/1.cc: Add
	exception specification.
	* testsuite/23_containers/forward_list/cons/11.cc: Avoid
	-Wdeprecated-copy warning.
	* testsuite/23_containers/headers/bitset/synopsis.cc: Add
	exception specification.
	* testsuite/23_containers/headers/deque/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/forward_list/synopsis.cc:
	Likewise.
	* testsuite/23_containers/headers/list/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/map/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/queue/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/set/synopsis.cc: Likewise.
	* testsuite/23_containers/headers/vector/synopsis.cc: Likewise.
	* testsuite/23_containers/list/modifiers/swap/1.cc: Likewise.
	* testsuite/23_containers/map/modifiers/swap/1.cc: Likewise.
	* testsuite/23_containers/multimap/modifiers/swap/1.cc:
	Likewise.
	* testsuite/23_containers/multiset/modifiers/swap/1.cc:
	Likewise.
	* testsuite/23_containers/set/modifiers/swap/1.cc: Likewise.
	* testsuite/23_containers/unordered_set/56267-2.cc: Avoid
	-Wdeprecated-copy warning.
	* testsuite/23_containers/vector/bool/23632.cc: Avoid
	-Wempty-body warning.
	* testsuite/23_containers/vector/modifiers/swap/1.cc: Add
	exception specification.
	* testsuite/25_algorithms/heap/moveable2.cc: Fix misplaced
	parentheses around arguments.
	* testsuite/25_algorithms/sample/1.cc: Use return value.
	* testsuite/25_algorithms/search/searcher.cc: Avoid -Wunused
	warnings.
	* testsuite/27_io/basic_ostream/exceptions/char/9561.cc:
	Likewise.
	* testsuite/27_io/basic_ostream/exceptions/wchar_t/9561.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Avoid
	-Wsign-compare warning.
	* testsuite/experimental/any/assign/2.cc: Avoid -Wunused warnings.
	* testsuite/experimental/any/cons/2.cc: Likewise.
	* testsuite/experimental/filesystem/operations/remove_all.cc:
	Avoid -Wign-compare warning.
	* testsuite/experimental/memory/observer_ptr/cons/cons.cc:
	Likewise.
	* testsuite/experimental/memory_resource/null_memory_resource.cc:
	Likewise.
	* testsuite/experimental/source_location/1.cc: Avoid -Waddress
	warning.
	* testsuite/ext/pod_char_traits.cc: Avoid -Wunused warning.
	* testsuite/ext/vstring/modifiers/clear/56166.cc: Avoid
	-Wcatch-value.
	* testsuite/std/concepts/concepts.lang/concept.swappable/swap.cc:
	Avoid -Wunused warning.
	* testsuite/std/concepts/concepts.lang/concept.swappable/swappable.cc:
	Likewise.
	* testsuite/tr1/2_general_utilities/shared_ptr/cons/43820_neg.cc:
	Prune additional warnings.
	* testsuite/tr1/3_function_objects/function/1.cc: Avoid
	-Wcatch-value warning.
	* testsuite/util/replacement_memory_operators.h: Define sized
	delete to avoid warnings.
	* testsuite/util/testsuite_api.h (_NonDefaultConstructible): Add
	user-declared assignment operator to stop -Wdeprecated-copy
	warnings.
	* testsuite/util/testsuite_containers.h: Avoid -Wunused warning.
	* testsuite/util/testsuite_iterators.h: Avoid -Wsign-compare
	warnings.
	* testsuite/util/testsuite_new_operators.h: Define sized deleted.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/25_algorithms/all_of/constexpr.cc: Check result of
	the algorithm.
	* testsuite/25_algorithms/any_of/constexpr.cc: Likewise.
	* testsuite/25_algorithms/binary_search/constexpr.cc: Likewise.
	* testsuite/25_algorithms/copy_backward/constexpr.cc: Likewise.
	* testsuite/25_algorithms/count/constexpr.cc: Likewise.
	* testsuite/25_algorithms/equal/constexpr.cc: Likewise.
	* testsuite/25_algorithms/equal_range/constexpr.cc: Likewise.
	* testsuite/25_algorithms/fill/constexpr.cc: Likewise.
	* testsuite/25_algorithms/find_end/constexpr.cc: Likewise.
	* testsuite/25_algorithms/find_if/constexpr.cc: Likewise.
	* testsuite/25_algorithms/is_partitioned/constexpr.cc: Likewise.
	* testsuite/25_algorithms/is_permutation/constexpr.cc: Likewise.
	* testsuite/25_algorithms/is_sorted_until/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/lexicographical_compare/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/lower_bound/constexpr.cc: Likewise.
	* testsuite/25_algorithms/merge/constexpr.cc: Likewise.
	* testsuite/25_algorithms/mismatch/constexpr.cc: Likewise.
	* testsuite/25_algorithms/none_of/constexpr.cc: Likewise.
	* testsuite/25_algorithms/partition_copy/constexpr.cc: Likewise.
	* testsuite/25_algorithms/remove_copy/constexpr.cc: Likewise.
	* testsuite/25_algorithms/remove_copy_if/constexpr.cc: Likewise.
	* testsuite/25_algorithms/remove_if/constexpr.cc: Likewise.
	* testsuite/25_algorithms/replace_if/constexpr.cc: Likewise.
	* testsuite/25_algorithms/reverse/constexpr.cc: Likewise.
	* testsuite/25_algorithms/reverse_copy/constexpr.cc: Likewise.
	* testsuite/25_algorithms/rotate_copy/constexpr.cc: Likewise.
	* testsuite/25_algorithms/search/constexpr.cc: Likewise.
	* testsuite/25_algorithms/set_difference/constexpr.cc: Likewise.
	* testsuite/25_algorithms/set_intersection/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/set_symmetric_difference/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/set_union/constexpr.cc: Likewise.
	* testsuite/25_algorithms/unique_copy/constexpr.cc: Likewise.
	* testsuite/25_algorithms/upper_bound/constexpr.cc: Likewise.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/uniform_int_dist.h (_Power_of_two): Add
	constexpr.
	(uniform_int_distribution::_S_nd): Add static_assert to ensure
	the wider type is twice as wide as the result type.
	(uniform_int_distribution::__generate_impl): Add static_assert
	and declare variables as constexpr where appropriate.
	(uniform_int_distribution:operator()): Likewise. Only consider
	the uniform random bit generator's range of possible results
	when deciding whether _S_nd can be used, not the __uctype type.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/rope (_Refcount_Base::_M_ref_count): Remove
	volatile qualifier.
	(_Refcount_Base::_M_decr()): Likewise.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_function.h (_Function_handler<void, void>):
	Define explicit specialization used for invalid target types.
	(_Base_manager::_M_manager) [!__cpp_rtti]: Return null.
	(function::target_type()): Check for null pointer.
	(function::target()): Define unconditionall. Fix bug with
	const_cast of function pointer type.
	(function::target() const): Define unconditionally, but
	only use RTTI if enabled.
	* testsuite/20_util/function/target_no_rtti.cc: New test.

2020-10-29  Patrick Palka  <ppalka@redhat.com>

	* testsuite/25_algorithms/lexicographical_compare/constrained.cc:
	(test03): Fix initializing the vector vy with the array y of size 4.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/hashtable_policy.h (_Local_iterator_base): Cast
	value to avoid -Wsign-compare warnings.
	* include/bits/regex.h (sub_match::_M_str): Avoid narrowing
	conversion.
	* include/bits/regex_compiler.tcc (_Compiler::_M_quantifier):
	Initialize variable to avoid -Wmaybe-uninitialized warning.
	* include/bits/shared_ptr_base.h (_Sp_counted_deleter::_Impl):
	Reorder mem-initializer-list to avoid -Wreorder warning.
	* include/bits/stl_tree.h (_Rb_tree_impl): Explicitly
	initialize base class in copy constructor.
	* include/debug/safe_iterator.h (_Safe_iterator): Likewise.
	* include/ext/debug_allocator.h: Reorder mem-initializer-list
	to avoid -Wreorder warning.
	* include/ext/throw_allocator.h (throw_allocator_limit)
	(throw_allocator_random): Add user-declared assignment operators
	to avoid -Wdeprecated-copy warnings.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/uniform_int_dist.h (uniform_int_distribution):
	Rename _UniformRandomNumberGenerator template parameters to
	_UniformRandomBitGenerator, as per P0346R1.

2020-10-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/sstream (basic_stringbuf(__string_type&&, openmode)):
	Call _M_init_syncbuf to set up get/put areas. Also qualify
	std::move.

2020-10-28  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): Remove duplicate
	patterns.
	(CXXABI_1.3.13): Restore missing piece.

2020-10-28  Thomas Rodgers  <trodgers@redhat.com>

	* acinclude.m4 (glibcxx_SUBDIRS): Add src/c++20.
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): New symbols.
	* configure: Regenerate.
	* include/std/sstream:
	(basic_stringbuf::basic_stringbuf(allocator const&)): New constructor.
	(basic_stringbuf::basic_stringbuf(openmode, allocator const&)): Likewise.
	(basic_stringbuf::basic_stringbuf(basic_string&&, openmode)): Likewise.
	(basic_stringbuf::basic_stringbuf(basic_stringbuf&&, allocator const&)):
	Likewise.
	(basic_stringbuf::get_allocator()): New method.
	(basic_stringbuf::view()): Likewise.
	(basic_istringstream::basic_istringstream(basic_string&&, openmode)):
	New constructor.
	(basic_istringstream::basic_istringstream(openmode, allocator const&)):
	Likewise
	(basic_istringstream::view()): New method.
	(basic_ostringstream::basic_ostringstream(basic_string&&, openmode)):
	New constructor.
	(basic_ostringstream::basic_ostringstream(openmode, allocator const&)):
	Likewise
	(basic_ostringstream::view()): New method.
	(basic_stringstream::basic_stringstream(basic_string&&, openmode)):
	New constructor.
	(basic_stringstream::basic_stringstream(openmode, allocator const&)):
	Likewise
	(basic_stringstream::view()): New method.
	* src/Makefile.in: Add c++20 directory.
	* src/Makefile.am: Regenerate.
	* src/c++20/Makefile.am: Add makefile for new sub-directory.
	* src/c++20/Makefile.in: Generate.
	* src/c++20/sstream-inst.cc: New file defining explicit
	instantiations for basic_stringbuf, basic_istringstream,
	basic_ostringstream, and basic_stringstream member functions
	added in C++20.
	* testsuite/27_io/basic_stringbuf/cons/char/2.cc: New test.
	* testsuite/27_io/basic_stringbuf/cons/wchar_t/2.cc: Likewise.
	* testsuite/27_io/basic_stringbuf/view/char/1.cc: Likewise.
	* testsuite/27_io/basic_stringbuf/view/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_istringstream/cons/char/1.cc: Likewise.
	* testsuite/27_io/basic_istringstream/cons/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_istringstream/view/char/1.cc: Likewise.
	* testsuite/27_io/basic_istringstream/view/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_ostringstream/cons/char/1.cc: Likewise.
	* testsuite/27_io/basic_ostringstream/cons/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_ostringstream/view/char/1.cc: Likewise.
	* testsuite/27_io/basic_ostringstream/view/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_stringstream/cons/char/1.cc: Likewise.
	* testsuite/27_io/basic_stringstream/cons/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_stringstream/view/char/1.cc: Likewise.
	* testsuite/27_io/basic_stringstream/view/wchar_t/1.cc: Likewise.

2020-10-28  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/97613
	* include/std/chrono (year_month_weekday::operator sys_days):
	Cast the result of index() to int so that the initializer for
	days{} is sign-extended when it's converted to the underlying
	type.
	* testsuite/std/time/year_month_weekday/3.cc: New test.

2020-10-28  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/new_opnt.cc (new): Add comment about forced unwind
	exceptions.

2020-10-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94268
	* config/os/mingw32-w64/os_defines.h (_GLIBCXX_BUFSIZ):
	Define.
	* config/os/mingw32/os_defines.h (_GLIBCXX_BUFSIZ):
	Define.
	* include/bits/fstream.tcc: Use _GLIBCXX_BUFSIZ instead
	of BUFSIZ.
	* include/ext/stdio_filebuf.h: Likewise.
	* include/std/fstream (_GLIBCXX_BUFSIZ): Define.

2020-10-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95592
	* include/bits/valarray_after.h (_DEFINE_EXPR_UNARY_OPERATOR)
	(_DEFINE_EXPR_BINARY_OPERATOR, _DEFINE_EXPR_BINARY_FUNCTION):
	Use elaborated-type-specifier and qualified-id to avoid
	ambiguities with QNX system headers.
	* testsuite/26_numerics/valarray/95592.cc: New test.

2020-10-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95609
	* include/std/span (span): Reorder data members to match common
	implementations of struct iovec.
	* testsuite/23_containers/span/layout_compat.cc: New test.

2020-10-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/functional (std::_Placeholder): Define for C++98
	as well as later standards.
	* include/tr1/functional (std::placeholders::_1 etc): Declare
	for C++98.
	(tr1::_Placeholder): Replace with using-declaration for
	std::_Placeholder.
	(tr1::placeholders::_1 etc.): Replace with using-directive for
	std::placeholders.

2020-10-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/tr1/ell_integral.tcc (__ellint_rf, __ellint_rd)
	(__ellint_rc, __ellint_rj): Remove unused variables.
	* include/tr1/modified_bessel_func.tcc (__airy): Likewise.

2020-10-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/locale_conv.h (__str_codecvt_out_all):
	Add cast to compare operands of the same signedness.
	* include/bits/locale_facets_nonio.tcc
	(time_get::_M_extract_wday_or_month): Likewise.
	* include/bits/sstream.tcc (basic_stringbuf::overflow):
	Likewise.
	* include/tr1/legendre_function.tcc (__sph_legendre): Use
	unsigned for loop variable.

2020-10-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/charconv (from_chars): Add noexcept to match
	definitions in src/c++17/floating_from_chars.cc

2020-10-27  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_dir.cc (fs::directory_iterator::operator*):
	Add noexcept. Do not throw on precondition violation.

2020-10-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (path::_List::begin, path::_List::end):
	Add noexcept to match definitions in src/c++17/fs_path.cc.

2020-10-27  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/memory_resource/new_delete_resource.cc:
	Add missing <cstdint> header.
	* testsuite/experimental/memory_resource/resource_adaptor.cc:
	Likewise.

2020-10-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/executor (strand::_State): Fix thinko.

2020-10-26  Ville Voutilainen  <ville.voutilainen@gmail.com>

	* include/std/type_traits (__is_nt_constructible_impl): Remove.
	(__is_nothrow_constructible_impl): Adjust.
	(is_nothrow_default_constructible): Likewise.
	(__is_nt_assignable_impl): Remove.
	(__is_nothrow_assignable_impl): Adjust.

2020-10-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97570
	* libsupc++/new_opa.cc: Declare size_t in global namespace.
	Remove unused header.

2020-10-26  Stephan Bergmann  <sbergman@redhat.com>

	* include/bits/shared_ptr_base.h
	(_Sp_counted_base::_M_add_ref_lock_nothrow(): Add noexcept to
	definitions to match declaration.
	(__shared_count(const __weak_count&, nothrow_t)): Add noexcept
	to declaration to match definition.

2020-10-23  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (single_view::single_view): Mark the
	in place constructor explicit as per LWG 3428.
	(take_view): Remove the constraint on the deduction guide's
	template parameter as per LWG 3447.

2020-10-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/memory_resource: Include <tuple>.
	(polymorphic_allocator::construct): Qualify forward_as_tuple.
	* include/std/memory_resource: Likewise.

2020-10-22  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/condition_variable/members/68519.cc:
	Define recent_epoch_float_clock::duration to meet the Cpp17Clock
	requirements.

2020-10-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/shared_mutex: Only include <condition_variable>
	when pthread_rwlock_t and POSIX timers are not available.
	(__cpp_lib_shared_mutex, __cpp_lib_shared_timed_mutex): Change
	value to be type 'long'.
	* include/std/version (__cpp_lib_shared_mutex)
	(__cpp_lib_shared_timed_mutex): Likewise.

2020-10-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/shared_ptr.h: Include <iosfwd>.
	* include/bits/shared_ptr_base.h: Include required headers here
	directly, instead of in <memory>.
	* include/bits/uses_allocator_args.h: New file. Move utility
	functions for uses-allocator construction from <memory> to here.
	Only define the utility functions when concepts are available.
	(__cpp_lib_make_obj_using_allocator): Define non-standard
	feature test macro.
	* include/std/condition_variable: Remove unused headers.
	* include/std/future: Likewise.
	* include/std/memory: Remove headers that are not needed
	directly, and are now inclkuded where they're needed. Include
	new <bits/uses_allocator_args.h> header.
	* include/std/memory_resource: Include only the necessary
	headers. Use new feature test macro to detect support for the
	utility functions.
	* include/std/scoped_allocator: Likewise.
	* include/std/version (__cpp_lib_make_obj_using_allocator):
	Define.

2020-10-22  Olivier Hainque  <hainque@adacore.com>

	* crossconfig.m4: Turn vxworks matcher into vxworks*.
	* configure.host: Likewise.
	* configure: Regenerate.

2020-10-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr.h (shared_ptr(const weak_ptr&, nothrow_t)):
	Add noexcept.
	* include/bits/shared_ptr_base.h (_Sp_counted_base::_M_add_ref_lock):
	Remove specializations and just call _M_add_ref_lock_nothrow.
	(__shared_count, __shared_ptr): Use nullptr for null pointer
	constants.
	(__shared_count(const __weak_count&)): Use _M_add_ref_lock_nothrow
	instead of _M_add_ref_lock.
	(__shared_count(const __weak_count&, nothrow_t)): Add noexcept.
	(__shared_ptr::operator bool()): Add noexcept.
	(__shared_ptr(const __weak_ptr&, nothrow_t)): Add noexcept.

2020-10-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97512
	* include/bits/ranges_util.h (tuple_size<subrange>)
	(tuple_element<I, cv subrange>): Move here from ...
	* include/std/ranges: ... here.
	* testsuite/std/ranges/subrange/97512.cc: New test.

2020-10-21  Thomas Rodgers  <trodgers@redhat.com>

	* include/pstl/algorithm_impl.h: Update file.
	* include/pstl/execution_impl.h: Likewise.
	* include/pstl/glue_algorithm_impl.h: Likewise.
	* include/pstl/glue_memory_impl.h: Likewise.
	* include/pstl/glue_numeric_impl.h: Likewise.
	* include/pstl/memory_impl.h: Likewise.
	* include/pstl/numeric_impl.h: Likewise.
	* include/pstl/parallel_backend.h: Likewise.
	* include/pstl/parallel_backend_serial.h: Likewise.
	* include/pstl/parallel_backend_tbb.h: Likewise.
	* include/pstl/parallel_backend_utils.h: Likewise.
	* include/pstl/pstl_config.h: Likewise.
	* include/pstl/unseq_backend_simd.h: Likewise.

2020-10-20  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable_policy.h
	(_Hash_node_value_base<>): Remove _Hash_node_base inheritance.
	(_Hash_node_code_cache<bool _Cache_hash_code>): New.
	(_Hash_node_value<typename _Value, bool _Cache_hash_code>): New.
	(_Hash_node<>): Inherits _Hash_node_base<> and _Hash_node_value<>.
	(_Map_base<>::__node_type): Remove.
	(_Map_base<>::iterator): Remove.
	(_Insert_base<>::__hash_cached): New.
	(_Insert_base<>::__constant_iterators): New.
	(_Insert_base<>::__hashtable_alloc): New.
	(_Insert_base<>::__node_type): Remove.
	(_Insert_base<>::__node_ptr): New.
	(_Hash_code_base<>): Remove specializations.
	(_Hash_code_base<>::__node_type): Remove.
	(_Hash_code_base<>::_M_bucket_index(const __node_type*, size_t)):
	Replace by...
	(_Hash_code_base<>::_M_bucket_index(const _Hash_node_value<>&, size_t)):
	...this.
	(_Hash_code_base<>::_M_store_code(__node_type*, __hash_code)):
	Replace by...
	(_Hash_code_base<>::_M_store_code(_Hash_node_code_cache<>&, __hash_code)):
	...this.
	(_Hash_code_base<>::_M_copy_code(__node_type*, const __node_type*)):
	Replace by...
	(_Hash_code_base<>::_M_copy_code(_Hash_node_code_cache<>&,
	const _Hash_node_code_base<>&)): ...this.
	(_Hashtable_base<>::__constant_iterators): Remove.
	(_Hashtable_base<>::__unique_keys): Remove.
	(_Hashtable_base<>::__node_type): Remove.
	(_Hashtable_base<>::iterator): Remove.
	(_Hashtable_base<>::const_iterator): Remove.
	(_Hashtable_base<>::local_iterator): Remove.
	(_Hashtable_base<>::const_local_iterator): Remove.
	(_Hashtable_base<>::__ireturn_type): Remove.
	(_Hashtable_base<>::_Equal_hash_code<>::_S_equals): Replace by...
	(_Hashtable_base<>::_S_equals(__hash_code, const _Hash_node_code_hash<>&)):
	...this.
	(_Hashtable_base<>::_Equal_hash_code<>::_S_node_equals): Replace by...
	(_Hashtable_base<>::_S_node_equals(__hash_code,
	const _Hash_node_code_hash<>&)): ...this.
	(_Hashtable_base<>::_Equal_hash_code<>): Remove.
	(_Hashtable_base<>::_M_equals): Adapt.
	(_Hashtable_baxe<>::_M_node_equals): Adapt.
	(_Equality<>::_M_equal): Adapt.
	(_Hashtable_alloc<>::__node_ptr): New.
	(_Hashtable_alloc<>::__bucket_type): Rename into...
	(_Hashtable_alloc<>::__node_base_ptr): ...this.
	(_Hashtable_alloc<>::__bucket_alloc_type): Rename into...
	(_Hashtable_alloc<>::__buckets_alloc_type): ...this.
	(_Hashtable_alloc<>::__bucket_alloc_traits): Rename into...
	(_Hashtable_alloc<>::__buckets_alloc_traits): ...this.
	(_Hashtable_alloc<>::__buckets_ptr): New.
	(_Hashtable_alloc<>::_M_allocate_node): Adapt.
	(_Hashtable_alloc<>::_M_deallocate_node): Adapt.
	(_Hashtable_alloc<>::_M_deallocate_node_ptr): Adapt.
	(_Hashtable_alloc<>::_M_deallocate_nodes): Adapt.
	(_Hashtable_alloc<>::_M_allocate_buckets): Adapt.
	(_Hashtable_alloc<>::_M_deallocate_buckets): Adapt.
	* include/bits/hashtable.h (_Hashtable<>): Adapt.

2020-10-20  Aldy Hernandez  <aldyh@redhat.com>

	* testsuite/21_strings/basic_string/capacity/1.cc: Pass
	-Wno-stringop-overflow to test.

2020-10-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95917
	* include/std/coroutine (__noop_coro_frame): Replace with
	noop_coroutine_handle::__frame.
	(__dummy_resume_destroy): Define inline in __frame.
	(__noop_coro_fr): Replace with noop_coroutine_handle::_S_fr
	and define as inline.
	* testsuite/18_support/coroutines/95917.cc: New test.

2020-10-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/coroutine (coroutine_handle<_Promise>): Remove
	base class. Add constructors, conversions, accessors etc. as
	proposed for LWG 3460.
	(coroutine_handle<noop_coroutine_promise>): Likewise.
	* testsuite/18_support/coroutines/lwg3460.cc: New test.

2020-10-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/unique_ptr.h (make_unique_for_overwrite): Define
	for C++20.
	* testsuite/20_util/unique_ptr/creation/array_neg.cc: Remove
	unused header. Adjust standard reference.
	* testsuite/20_util/unique_ptr/creation/for_overwrite.cc: New test.
	* testsuite/20_util/unique_ptr/creation/for_overwrite__neg.cc: New test.

2020-10-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/tuple (_Head_base<Idx, Head, true>): Use reserved
	form of __no_unique_address__ attribute because
	no_unique_address is not reserved prior to C++20.

2020-10-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/node_handle.h (_Node_handle_common): Replace
	std::optional with custom type.
	* testsuite/20_util/variant/exception_safety.cc: Add missing
	header include.

2020-10-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/precompiled/expc++.h: Removed.

2020-10-17  Ville Voutilainen  <ville.voutilainen@gmail.com>

	PR libstdc++/97449
	* include/std/variant
	(__gen_vtable_impl<>::_S_apply_single_alt):
	Diagnose visitor return type mismatches here..
	(__gen_vtable_impl</*base case*/>::_S_apply):
	..not here.

2020-10-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/concepts: Fix typos in copyright notice.
	* include/std/ranges: Likewise.

2020-10-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97415
	* include/std/sstream (basic_stringbuf::str()): Check for
	null egptr() before comparing to non-null pptr().

2020-10-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/modifiers/assign/char/move_assign_optim.cc:
	Do not generate debug info.
	* testsuite/21_strings/basic_string/modifiers/assign/wchar_t/move_assign_optim.cc:
	Likewise.

2020-10-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h (basic_string(const Alloc&))
	(basic_string(const basic_string&)
	(basic_string(const CharT*, size_type, const Alloc&))
	(basic_string(const CharT*, const Alloc&))
	(basic_string(size_type, CharT, const Alloc&))
	(basic_string(initializer_list<CharT>, const Alloc&))
	(basic_string(InputIterator, InputIterator, const Alloc&)):
	Define inline in class body.
	* include/bits/basic_string.tcc (basic_string(const Alloc&))
	(basic_string(const basic_string&)
	(basic_string(const CharT*, size_type, const Alloc&))
	(basic_string(const CharT*, const Alloc&))
	(basic_string(size_type, CharT, const Alloc&))
	(basic_string(initializer_list<CharT>, const Alloc&))
	(basic_string(InputIterator, InputIterator, const Alloc&)):
	Move definitions into class body.

2020-10-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp (check_effective_target_cxx11-abi):
	Add comments about which test flags get used by the check.

2020-10-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/allocator/char/copy.cc: Make
	comment more precise about what isn't supported by COW strings.
	* testsuite/21_strings/basic_string/allocator/char/copy_assign.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/char/move.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/char/move_assign.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/char/noexcept.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/char/operator_plus.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/char/swap.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/wchar_t/copy.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/wchar_t/copy_assign.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/wchar_t/move.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/wchar_t/move_assign.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/wchar_t/noexcept.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/wchar_t/operator_plus.cc:
	Likewise.
	* testsuite/21_strings/basic_string/allocator/wchar_t/swap.cc:
	Likewise.

2020-10-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/allocator/char/minimal.cc:
	Do not require cxx11-abi effective target.
	* testsuite/21_strings/basic_string/allocator/wchar_t/minimal.cc:
	Likewise.
	* testsuite/27_io/basic_fstream/cons/base.cc: Likewise.

2020-10-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
	(basic_string(const _CharT*, const _Alloc&)): Constrain to
	require an allocator-like type to fix CTAD ambiguity (LWG 3706).
	* testsuite/21_strings/basic_string/cons/char/deduction.cc:
	Remove dg-skip-if.
	* testsuite/21_strings/basic_string/cons/wchar_t/deduction.cc:
	Likewise.

2020-10-13  Nuno Lopes  <nuno.lopes@ist.utl.pt>

	* include/bits/stl_algo.h (any_of): Fix incorrect description
	in comment.

2020-10-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/evolution.xml: Document some API changes
	and deprecations.
	* doc/xml/manual/intro.xml: Document LWG 2499.
	* doc/xml/manual/status_cxx2020.xml: Update status.
	* doc/html/*: Regenerate.

2020-10-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/book.txml: Remove trailing whitespace.
	* doc/xml/chapter.txml: Likewise.
	* doc/xml/class.txml: Likewise.
	* doc/xml/gnu/fdl-1.3.xml: Likewise.
	* doc/xml/gnu/gpl-3.0.xml: Likewise.
	* doc/xml/manual/abi.xml: Likewise.
	* doc/xml/manual/algorithms.xml: Likewise.
	* doc/xml/manual/allocator.xml: Likewise.
	* doc/xml/manual/appendix_contributing.xml: Likewise.
	* doc/xml/manual/appendix_free.xml: Likewise.
	* doc/xml/manual/appendix_porting.xml: Likewise.
	* doc/xml/manual/atomics.xml: Likewise.
	* doc/xml/manual/auto_ptr.xml: Likewise.
	* doc/xml/manual/backwards_compatibility.xml: Likewise.
	* doc/xml/manual/bitmap_allocator.xml: Likewise.
	* doc/xml/manual/build_hacking.xml: Likewise.
	* doc/xml/manual/codecvt.xml: Likewise.
	* doc/xml/manual/concurrency.xml: Likewise.
	* doc/xml/manual/concurrency_extensions.xml: Likewise.
	* doc/xml/manual/configure.xml: Likewise.
	* doc/xml/manual/containers.xml: Likewise.
	* doc/xml/manual/ctype.xml: Likewise.
	* doc/xml/manual/debug.xml: Likewise.
	* doc/xml/manual/debug_mode.xml: Likewise.
	* doc/xml/manual/diagnostics.xml: Likewise.
	* doc/xml/manual/documentation_hacking.xml: Likewise.
	* doc/xml/manual/evolution.xml: Likewise.
	* doc/xml/manual/internals.xml: Likewise.
	* doc/xml/manual/intro.xml: Likewise.
	* doc/xml/manual/io.xml: Likewise.
	* doc/xml/manual/iterators.xml: Likewise.
	* doc/xml/manual/locale.xml: Likewise.
	* doc/xml/manual/localization.xml: Likewise.
	* doc/xml/manual/messages.xml: Likewise.
	* doc/xml/manual/mt_allocator.xml: Likewise.
	* doc/xml/manual/numerics.xml: Likewise.
	* doc/xml/manual/parallel_mode.xml: Likewise.
	* doc/xml/manual/policy_data_structures.xml: Likewise.
	* doc/xml/manual/prerequisites.xml: Likewise.
	* doc/xml/manual/shared_ptr.xml: Likewise.
	* doc/xml/manual/spine.xml: Likewise.
	* doc/xml/manual/status_cxxtr1.xml: Likewise.
	* doc/xml/manual/status_cxxtr24733.xml: Likewise.
	* doc/xml/manual/strings.xml: Likewise.
	* doc/xml/manual/support.xml: Likewise.
	* doc/xml/manual/test.xml: Likewise.
	* doc/xml/manual/test_policy_data_structures.xml: Likewise.
	* doc/xml/manual/using.xml: Likewise.
	* doc/xml/manual/using_exceptions.xml: Likewise.
	* doc/xml/manual/utilities.xml: Likewise.
	* doc/html/*: Regenerate.

2020-10-12  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (take_while_view::begin): Constrain the
	const overload further as per LWG 3450.
	(take_while_view::end): Likewise.
	* testsuite/std/ranges/adaptors/take_while.cc: Add test for LWG
	3450.

2020-10-12  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/95322
	* include/std/ranges (take_view::_CI): Define this alias
	template as per LWG 3449 and remove ...
	(take_view::_Sentinel::_CI): ... this type alias.
	(take_view::_Sentinel::operator==): Adjust use of _CI
	accordingly.  Define a second overload that accepts an iterator
	of the opposite constness as per LWG 3449.
	(take_while_view::_Sentinel::operator==): Likewise.
	* testsuite/std/ranges/adaptors/95322.cc: Add tests for LWG 3449.

2020-10-12  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in: Update to Doxygen 1.8.20 format.

2020-10-12  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (PREDEFINED): Use __cplusplus=201703L
	so that C++17 features are documented.

2020-10-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_algobase.h (copy, move, copy_backward)
	(move_backward): Fix documentation for returned iterator.

2020-10-12  Martin Sebor  <msebor@redhat.com>

	PR c++/97201
	* libsupc++/new (operator new): Add attribute alloc_size and malloc.

2020-10-11  Clement Chigot  <clement.chigot@atos.net>

	* config/os/aix/t-aix: Add complementary mode object file to
	libstdc++fs.a

2020-10-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97362
	* doc/html/manual/source_code_style.html: Regenerate.
	* doc/xml/manual/appendix_contributing.xml: Add __deref to
	BADNAMES.
	* include/debug/functions.h (_Irreflexive_checker::__deref):
	Rename to __ref.
	* testsuite/17_intro/badnames.cc: Check __deref.

2020-10-10  Ville Voutilainen  <ville.voutilainen@gmail.com>

	* include/std/variant (__check_visitor_result):
	Use size_t for indexes.
	(__check_visitor_results): Likewise.

2020-10-09  Ville Voutilainen  <ville.voutilainen@gmail.com>

	PR libstdc++/95904
	* include/std/variant (__deduce_visit_result): Add a nested ::type.
	(__gen_vtable_impl</*base case*/>::_S_apply):
	Check the visitor return type.
	(__same_types): New.
	(__check_visitor_result): Likewise.
	(__check_visitor_results): Likewise.
	(visit(_Visitor&&, _Variants&&...)): Use __check_visitor_results
	in case we're visiting just one variant.
	* testsuite/20_util/variant/visit_neg.cc: Adjust.

2020-10-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97311
	* include/bits/random.tcc (seed_seq::generate): Use uint32_t for
	calculations. Also split the first loop into three loops to
	avoid branching on k on every iteration, resolving PR 94823.
	* testsuite/26_numerics/random/seed_seq/97311.cc: New test.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-erro
	line number.

2020-10-09  Daniel Lemire  <lemire@gmail.com>

	* include/bits/uniform_int_dist.h (uniform_int_distribution::_S_nd):
	New member function implementing Lemire's "nearly divisionless"
	algorithm.
	(uniform_int_distribution::operator()): Use _S_nd when the range
	of the URBG is the full width of the result type.

2020-10-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/Makefile.am: Set and export variable separately.
	* testsuite/Makefile.in: Regenerate.

2020-10-09  Jonathan Wakely  <jwakely@redhat.com>

	* scripts/check_performance: Use gnu++11 instead of gnu++0x.
	* testsuite/Makefile.am (check-performance): Export CXXFLAGS to
	child process.
	* testsuite/Makefile.in: Regenerate.

2020-10-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/performance/26_numerics/random_dist.cc: New test.

2020-10-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_performance.h (report_header): Remove
	unused variable.

2020-10-08  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/95788
	* include/bits/ranges_uninitialized.h:
	(__construct_at_fn::operator()): Rewrite in terms of
	std::construct_at.  Declare it conditionally noexcept.  Qualify
	calls to declval in its requires-clause.
	* testsuite/20_util/specialized_algorithms/construct_at/95788.cc:
	New test.

2020-10-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/82584
	* include/bits/random.tcc
	(discrete_distribution::param_type::_M_initialize)
	(piecewise_constant_distribution::param_type::_M_initialize)
	(piecewise_linear_distribution::param_type::_M_initialize):
	Add assertions for positive sums..
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line.

2020-10-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ios_base.h (ios_base::failure): Add constructors
	takeing error_code argument. Add code() member function.
	* testsuite/27_io/ios_base/failure/cxx11.cc: Allow test to
	run for the old ABI but do not check for derivation from
	std::system_error.
	* testsuite/27_io/ios_base/failure/error_code.cc: New test.

2020-10-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (__detail::_Mod): Revert last change.
	(__detail::__mod): Do not use _Mod for a==0 case.
	* testsuite/26_numerics/random/linear_congruential_engine/operators/call.cc:
	Check other cases with a==0. Also check runtime results.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line.

2020-10-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (__detail::_Mod): Avoid divide by zero.
	* testsuite/26_numerics/random/linear_congruential_engine/operators/call.cc:
	New test.

2020-10-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (seed_seq(initializer_list<T>)): Rename
	parameter to use reserved name.
	* include/bits/ranges_algo.h (shift_left, shift_right): Rename
	template parameters to use reserved name.
	* libsupc++/exception_ptr.h (exception_ptr): Likewise for
	parameters and local variables.
	* testsuite/17_intro/names.cc: Check "il". Do not check "d" and
	"y" in C++20 mode.

2020-10-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90295
	* config/abi/pre/gnu.ver (CXXABI_1.3.13): New symbol version.
	(exception_ptr::_M_addref(), exception_ptr::_M_release()):
	Export symbols.
	* libsupc++/eh_ptr.cc (exception_ptr::exception_ptr()):
	Remove out-of-line definition.
	(exception_ptr::exception_ptr(const exception_ptr&)):
	Likewise.
	(exception_ptr::~exception_ptr()): Likewise.
	(exception_ptr::operator=(const exception_ptr&)):
	Likewise.
	(exception_ptr::swap(exception_ptr&)): Likewise.
	(exception_ptr::_M_addref()): Add branch prediction.
	* libsupc++/exception_ptr.h (exception_ptr::operator bool):
	Add noexcept.
	[!_GLIBCXX_EH_PTR_COMPAT] (operator==, operator!=): Define
	inline as hidden friends. Remove declarations at namespace
	scope.
	(exception_ptr::exception_ptr()): Define inline.
	(exception_ptr::exception_ptr(const exception_ptr&)):
	Likewise.
	(exception_ptr::~exception_ptr()): Likewise.
	(exception_ptr::operator=(const exception_ptr&)):
	Likewise.
	(exception_ptr::swap(exception_ptr&)): Likewise.
	* testsuite/util/testsuite_abi.cc: Add CXXABI_1.3.13.
	* testsuite/18_support/exception_ptr/90295.cc: New test.

2020-10-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (join_view): Remove deduction guide.
	(views::join): Add explicit template argument list to prevent
	deducing the wrong type.
	* testsuite/std/ranges/adaptors/join.cc: Move test for LWG 3474
	here, from ...
	* testsuite/std/ranges/adaptors/join_lwg3474.cc: Removed.

2020-10-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h: Use __int_traits<int> instead of
	std::numeric_limits<int>.
	* include/bits/uniform_int_dist.h: Use __int_traits<T>::__max
	instead of std::numeric_limits<T>::max().
	* include/bits/hashtable_policy.h: Use size_t(-1) instead of
	std::numeric_limits<size_t>::max().
	* include/std/regex: Include <ext/numeric_traits.h>.
	* include/std/string_view: Use typedef for __int_traits<int>.
	* src/c++11/hashtable_c++0x.cc: Use size_t(-1) instead of
	std::numeric_limits<size_t>::max().
	* testsuite/std/ranges/iota/96042.cc: Include <limits>.
	* testsuite/std/ranges/iota/difference_type.cc: Likewise.
	* testsuite/std/ranges/subrange/96042.cc: Likewise.

2020-10-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/numeric: Move all #include directives to the top
	of the header.
	* testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error line
	numbers.
	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.

2020-10-05  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver: Add new symbol.
	* include/bits/functexcept.h (__throw_bad_array_new_length):
	Declare new function.
	* include/ext/malloc_allocator.h (malloc_allocator::allocate):
	Throw bad_array_new_length for impossible sizes (LWG 3190).
	* include/ext/new_allocator.h (new_allocator::allocate):
	Likewise.
	* include/std/memory_resource (polymorphic_allocator::allocate)
	(polymorphic_allocator::allocate_object): Use new function,
	__throw_bad_array_new_length.
	* src/c++11/functexcept.cc (__throw_bad_array_new_length):
	Define.
	* testsuite/20_util/allocator/lwg3190.cc: New test.

2020-10-05  Mike Crowe  <mac@mcrowe.com>

	PR libstdc++/91486
	* include/bits/atomic_futex.h:
	(__atomic_futex_unsigned::_M_load_when_equal_until): Use target
	clock duration type when rounding.
	* testsuite/30_threads/async/async.cc (test_pr91486_wait_for):
	Rename from test_pr91486.
	(float_steady_clock): New class for test.
	(test_pr91486_wait_until): New test.

2020-10-05  Mike Crowe  <mac@mcrowe.com>

	* testsuite/20_util/duration_cast/rounding_c++11.cc: Copy
	rounding.cc and alter to support compilation for C++11 and to
	test std::chrono::__detail::ceil.

2020-10-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/29_atomics/atomic_float/value_init.cc: Use float
	instead of double so that __atomic_load_8 isn't needed.

2020-10-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/96817.cc: Use terminate handler that
	calls _Exit(0).

2020-10-02  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_iterator.h (reverse_iterator::iter_move):
	Define for C++20 as per P0896.
	(reverse_iterator::iter_swap): Likewise.
	(move_iterator::operator*): Apply P0896 changes for C++20.
	(move_iterator::operator[]): Likewise.
	* testsuite/24_iterators/reverse_iterator/cust.cc: New test.

2020-10-01  Jonathan Wakely  <jwakely@redhat.com>

	* config/cpu/arm/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST_AND_ACQUIRE):
	Do not try to dereference return value of __atomic_load_n.

2020-09-30  Jonathan Wakely  <jwakely@redhat.com>

	* config/cpu/arm/cxxabi_tweaks.h (_GLIBCXX_GUARD_TEST_AND_ACQUIRE):
	(_GLIBCXX_GUARD_SET_AND_RELEASE): Define for EABI.

2020-09-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (_GLIBCXX_HAVE_BUILTIN_IS_SAME):
	Define for GCC 11 or when !__is_identifier(__is_same).
	(_GLIBCXX_BUILTIN_IS_SAME_AS): Remove.
	* include/std/type_traits (is_same, is_same_v): Replace uses
	of _GLIBCXX_BUILTIN_IS_SAME_AS.

2020-09-28  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (filter_view): Declare the data member
	_M_base last instead of first, and adjust constructors' member
	initializer lists accordingly.
	(transform_view): Likewise.
	(take_view): Likewise.
	(take_while_view): Likewise.
	(drop_view): Likewise.
	(drop_while_view): Likewise.
	(join_view): Likewise.
	(split_view): Likewise (and tweak nearby formatting).
	(reverse_view): Likewise.
	* testsuite/std/ranges/adaptors/sizeof.cc: Update expected
	sizes.

2020-09-28  Patrick Palka  <ppalka@redhat.com>

	* testsuite/std/ranges/adaptors/sizeof.cc: New test.

2020-09-28  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_util.h (subrange::_M_end): Give it
	[[no_unique_address]].
	* testsuite/std/ranges/subrange/sizeof.cc: New test.

2020-09-28  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (iota_view::_M_bound): Give it
	[[no_unique_address]].
	* testsuite/std/ranges/iota/iota_view.cc: Check that an
	unbounded iota_view has minimal size.

2020-09-27  Clement Chigot  <clement.chigot@atos.net>

	* config/os/aix/t-aix: Use $(AR) without -X32_64.

2020-09-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96817
	* include/ext/atomicity.h (__gnu_cxx::__is_single_threaded()):
	New function wrapping __libc_single_threaded if available.
	(__exchange_and_add_dispatch, __atomic_add_dispatch): Use it.
	* libsupc++/guard.cc (__cxa_guard_acquire, __cxa_guard_abort)
	(__cxa_guard_release): Likewise.
	* testsuite/18_support/96817.cc: New test.

2020-09-25  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/Makefile.am: Remove redundant -std=gnu++1z flags.
	* libsupc++/Makefile.in: Regenerate.

2020-09-24  Antony Polukhin  <antoshkka@gmail.com>

	PR libstdc++/71579
	* include/std/type_traits (invoke_result, is_invocable)
	(is_invocable_r, is_nothrow_invocable, is_nothrow_invocable_r):
	Add static_asserts to make sure that the arguments of the type
	traits are not misused with incomplete types.
	* testsuite/20_util/invoke_result/incomplete_args_neg.cc: New test.
	* testsuite/20_util/is_invocable/incomplete_args_neg.cc: New test.
	* testsuite/20_util/is_invocable/incomplete_neg.cc: New test.
	* testsuite/20_util/is_nothrow_invocable/incomplete_args_neg.cc:
	New test.
	* testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc: Check
	for error on incomplete type usage in trait.

2020-09-24  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (__detail::__boxable): Split out the
	associated constraints of __box into here.
	(__detail::__box): Use the __boxable concept.  Define a leaner
	partial specialization for semiregular types.
	(single_view::_M_value): Give it [[no_unique_address]].
	(filter_view::_M_pred): Likewise.
	(transform_view::_M_fun): Likewise.
	(take_while_view::_M_pred): Likewise.
	(drop_while_view::_M_pred):: Likewise.
	* testsuite/std/ranges/adaptors/detail/semiregular_box.cc: New
	test.

2020-09-24  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/configure.xml: Correct name of option.
	* doc/html/*: Regenerate.

2020-09-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97167
	* src/c++17/fs_path.cc (path::_Parser::root_path()): Check
	for empty string before inspecting the first character.
	* testsuite/27_io/filesystem/path/append/source.cc: Append
	empty string_view to path.

2020-09-22  Glen Joseph Fernandes  <glenjofe@gmail.com>

	* include/bits/align.h (align): Fix overflow handling.
	* testsuite/20_util/align/3.cc: New test.

2020-09-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/Makefile.am: Add new headers and adjust for renamed
	header.
	* include/Makefile.in: Regenerate.
	* include/bits/iterator_concepts.h: Adjust for renamed header.
	* include/bits/range_access.h (ranges::*): Move to new
	<bits/ranges_base.h> header.
	* include/bits/ranges_algobase.h: Include new <bits/ranges_base.h>
	header instead of <ranges>.
	* include/bits/ranges_algo.h: Include new <bits/ranges_util.h>
	header.
	* include/bits/range_cmp.h: Moved to...
	* include/bits/ranges_cmp.h: ...here.
	* include/bits/ranges_base.h: New header.
	* include/bits/ranges_util.h: New header.
	* include/experimental/string_view: Include new
	<bits/ranges_base.h> header.
	* include/std/functional: Adjust for renamed header.
	* include/std/ranges (ranges::view_base, ranges::enable_view)
	(ranges::dangling, ranges::borrowed_iterator_t): Move to new
	<bits/ranges_base.h> header.
	(ranges::view_interface, ranges::subrange)
	(ranges::borrowed_subrange_t): Move to new <bits/ranges_util.h>
	header.
	* include/std/span: Include new <bits/ranges_base.h> header.
	* include/std/string_view: Likewise.
	* testsuite/24_iterators/back_insert_iterator/pr93884.cc: Add
	missing <ranges> header.
	* testsuite/24_iterators/front_insert_iterator/pr93884.cc:
	Likewise.

2020-09-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96803
	* include/std/tuple
	(_Tuple_impl(allocator_arg_t, Alloc, const _Tuple_impl<U...>&)):
	Use correct value category in __use_alloc call.
	* testsuite/20_util/tuple/cons/96803.cc: Check with constructors
	that require correct value category to be used.

2020-09-22  Patrick Palka  <ppalka@redhat.com>

	* include/std/span (span::front): Remove static_assert.
	(span::back): Likewise.
	(span::operator[]): Likewise.
	* testsuite/23_containers/span/back_neg.cc: Rewrite to verify
	that we check the preconditions of back() only when it's called.
	* testsuite/23_containers/span/front_neg.cc: Likewise for
	front().
	* testsuite/23_containers/span/index_op_neg.cc: Likewise for
	operator[].

2020-09-22  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_algo.h (__sample): Exit early when the
	input range is empty.
	* testsuite/25_algorithms/sample/3.cc: New test.

2020-09-22  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_algo.h (for_each_n): Mark constexpr for C++20.
	(search): Likewise for the overload that takes a searcher.
	* testsuite/25_algorithms/for_each/constexpr.cc: Test constexpr
	std::for_each_n.
	* testsuite/25_algorithms/search/constexpr.cc: Test constexpr
	std::search overload that takes a searcher.

2020-09-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (__replacement_assert): Add noreturn
	attribute.
	(__glibcxx_assert_impl): Use __builtin_expect to hint that the
	assertion is expected to pass.

2020-09-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (drop_view::begin()): Adjust constraints
	to match the correct condition for O(1) ranges::next (LWG 3482).
	* testsuite/std/ranges/adaptors/drop.cc: Check that iterator is
	cached for non-sized_range.

2020-09-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (transform_view, elements_view): Relax
	constraints on operator- for iterators, as per LWG 3483.
	* testsuite/std/ranges/adaptors/elements.cc: Check that we
	can take the difference of two iterators from a non-random
	access range.
	* testsuite/std/ranges/adaptors/transform.cc: Likewise.

2020-09-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97132
	* include/bits/align.h (align) [!_GLIBCXX_USE_C99_STDINT_TR1]:
	Remove unused code.
	(assume_aligned): Do not use __builtin_assume_aligned during
	constant evaluation.
	* testsuite/20_util/assume_aligned/1.cc: Improve test.
	* testsuite/20_util/assume_aligned/97132.cc: New test.

2020-09-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/97101
	* include/std/functional (bind_front): Fix order of parameters
	in is_nothrow_constructible_v specialization.
	* testsuite/20_util/function_objects/bind_front/97101.cc: New test.

2020-09-11  Thomas Rodgers  <trodgers@redhat.com>

	* include/std/memory: Move #include <bits/align.h> inside C++11
	conditional includes.

2020-09-11  Thomas Rodgers  <trodgers@redhat.com>

	* include/Makefile.am (bits_headers): Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/align.h: New file.
	* include/std/memory (align): Move definition to bits/align.h.
	(assume_aligned): Likewise.

2020-09-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono [C++17] (chrono::__detail::ceil): Add
	using declaration to make chrono::ceil available for internal
	use with a consistent name.
	(chrono::__detail::__ceil_impl): New function template.
	(chrono::__detail::ceil): Use __ceil_impl to compare and
	increment the value. Remove SFINAE constraint.

2020-09-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex_error.h (__throw_regex_error): Fix
	parameter declaration and use reserved attribute names.

2020-09-11  Mike Crowe  <mac@mcrowe.com>

	* include/std/condition_variable (condition_variable::wait_until):
	Convert delta to steady_clock duration before adding to current
	steady_clock time to avoid rounding errors described in PR68519.
	(condition_variable::wait_for): Simplify calculation of absolute
	time by using chrono::__detail::ceil in both overloads.
	* testsuite/30_threads/condition_variable/members/68519.cc:
	(test_wait_for): Renamed from test01. Replace unassigned val
	variable with constant false. Reduce scope of mx and cv
	variables to just test_wait_for function.
	(test_wait_until): Add new test case.

2020-09-11  Mike Crowe  <mac@mcrowe.com>

	PR libstdc++/91486
	* include/bits/atomic_futex.h
	(__atomic_futex_unsigned::_M_load_when_equal_for)
	(__atomic_futex_unsigned::_M_load_when_equal_until): Use
	__detail::ceil to convert delta to the reference clock
	duration type to avoid resolution problems.
	* include/std/chrono (__detail::ceil): Move implementation
	of std::chrono::ceil into private namespace so that it's
	available to pre-C++17 code.
	* testsuite/30_threads/async/async.cc (test_pr91486):
	Test __atomic_futex_unsigned::_M_load_when_equal_for.

2020-09-11  Mike Crowe  <mac@mcrowe.com>

	* include/bits/atomic_futex.h
	(__atomic_futex_unsigned::_M_load_when_equal_until): Add
	loop on generic _Clock to check the timeout against _Clock
	again after _M_load_when_equal_until returns indicating a
	timeout.
	* testsuite/30_threads/async/async.cc: Invent slow_clock
	that runs at an eleventh of steady_clock's speed. Use it
	to test the user-supplied-clock variant of
	__atomic_futex_unsigned::_M_load_when_equal_until works
	generally with test03 and loops correctly when the timeout
	time hasn't been reached in test04.

2020-09-11  Mike Crowe  <mac@mcrowe.com>

	PR libstdc++/93542
	* include/bits/atomic_futex.h (__atomic_futex_unsigned): Change
	__clock_t typedef to use steady_clock so that unknown clocks are
	synced to it rather than system_clock. Change existing __clock_t
	overloads of _M_load_and_text_until_impl and
	_M_load_when_equal_until to use system_clock explicitly. Remove
	comment about DR 887 since these changes address that problem as
	best as we currently able.

2020-09-11  Mike Crowe  <mac@mcrowe.com>

	PR libstdc++/93542
	* config/abi/pre/gnu.ver: Update for addition of
	__atomic_futex_unsigned_base::_M_futex_wait_until_steady.
	* include/bits/atomic_futex.h (__atomic_futex_unsigned_base):
	Add comments to clarify that _M_futex_wait_until and
	_M_load_and_test_until use CLOCK_REALTIME.
	(__atomic_futex_unsigned_base::_M_futex_wait_until_steady)
	(__atomic_futex_unsigned_base::_M_load_and_text_until_steady):
	New member functions that use CLOCK_MONOTONIC.
	(__atomic_futex_unsigned_base::_M_load_and_test_until_impl)
	(__atomic_futex_unsigned_base::_M_load_when_equal_until): Add
	overloads that accept a steady_clock time_point and use the
	new member functions.
	* src/c++11/futex.cc: Include headers required for
	clock_gettime.
	(futex_clock_monotonic_flag): New constant to tell futex to
	use CLOCK_MONOTONIC to match existing futex_clock_realtime_flag.
	(futex_clock_monotonic_unavailable): New global to store the
	result of trying to use CLOCK_MONOTONIC.
	(__atomic_futex_unsigned_base::_M_futex_wait_until_steady): Add
	new variant of _M_futex_wait_until that uses CLOCK_MONOTONIC to
	support waiting using steady_clock.

2020-09-11  Mike Crowe  <mac@mcrowe.com>

	* src/c++11/futex.cc: Add new constants for required futex
	flags.  Add futex_clock_realtime_unavailable flag to store
	result of trying to use FUTEX_CLOCK_REALTIME.
	(__atomic_futex_unsigned_base::_M_futex_wait_until): Try to
	use FUTEX_WAIT_BITSET with FUTEX_CLOCK_REALTIME and only
	fall back to using gettimeofday and FUTEX_WAIT if that's not
	supported.

2020-09-11  Mike Crowe  <mac@mcrowe.com>

	* testsuite/30_threads/async/async.cc (test02): Test steady_clock
	with std::future::wait_until.
	(test03): Add new test templated on clock type waiting for future
	associated with async to resolve.
	(main): Call test03 to test both system_clock and steady_clock.

2020-09-11  Torbjörn SVENSSON  <torbjorn.svensson@st.com>
	    Christophe Lyon  <christophe.lyon@linaro.org>

	* libsupc++/eh_call.cc: Avoid warning with -fno-exceptions.

2020-09-11  Torbjörn SVENSSON  <torbjorn.svensson@st.com>
	    Christophe Lyon  <christophe.lyon@linaro.org>

	* libsupc++/eh_call.cc: Avoid warning with -fno-exceptions.

2020-09-11  Christophe Lyon  <christophe.lyon@linaro.org>

	* include/bits/regex_error.h: Avoid warning with -fno-exceptions.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/locale_conv.h (__do_str_codecvt, __str_codecvt_in_all):
	Add casts to compare types of the same signedness.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_algobase.h (__equal_fn): Remove unused
	typedef.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/version (__cpp_lib_array_constexpr):
	(__cpp_lib_constexpr_char_traits): Only define C++17 value when
	compiling C++17.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/shared_ptr.h (shared_ptr(auto_ptr&&))
	(operator=(auto_ptr&&)): Add diagnostic pragmas to suppress
	warnings for uses of std::auto_ptr.
	* include/experimental/type_traits (is_literal_type_v):
	Likewise, for use of std::is_literal_type.
	* include/std/condition_variable (condition_variable_any::_Unlock):
	Likewise, for use of std::uncaught_exception.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (path::_List::type()): Avoid narrowing
	conversion.
	* include/std/chrono (operator+(const year&, const years&)):
	Likewise.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/codecvt.h (codecvt_byname): Remove names of
	unused parameters.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/locale_facets_nonio.tcc: Adjust whitespace.

2020-09-10  Krystian Kuźniarek  <krystian.kuzniarek@gmail.com>

	* include/c_global/cmath (__lerp): Avoid -Wparentheses warnings.

2020-09-10  Krystian Kuźniarek  <krystian.kuzniarek@gmail.com>

	* include/bits/atomic_base.h: Fix -Wunused-variable
	warnings.
	* include/ext/new_allocator.h: Fix -Wunused-parameter
	warnings.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (counted_iterator): Add assertions
	to check preconditions added by LWG 3472.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94160
	* src/c++17/memory_resource.cc (munge_options): Round
	max_blocks_per_chunk to a multiple of four.
	(__pool_resource::_M_alloc_pools()): Simplify slightly.
	* testsuite/20_util/unsynchronized_pool_resource/allocate.cc:
	Check that valid pointers are returned when small values are
	used for max_blocks_per_chunk.

2020-09-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96942
	* include/std/memory_resource (monotonic_buffer_resource::do_allocate):
	Use __builtin_expect when checking if a new buffer needs to be
	allocated from the upstream resource, and for checks for edge
	cases like zero sized buffers and allocations.
	* src/c++17/memory_resource.cc (aligned_size): New class template.
	(aligned_ceil): New helper function to round up to a given
	alignment.
	(monotonic_buffer_resource::chunk): Replace _M_size and _M_align
	with an aligned_size member. Remove _M_canary member. Change _M_next
	to pointer instead of unaligned buffer.
	(monotonic_buffer_resource::chunk::allocate): Round up to multiple
	of 64 instead of to power of two. Check for size overflow. Remove
	redundant check for minimum required alignment.
	(monotonic_buffer_resource::chunk::release): Adjust for changes
	to data members.
	(monotonic_buffer_resource::_M_new_buffer): Use aligned_ceil.
	(big_block): Replace _M_size and _M_align with aligned_size
	member.
	(big_block::big_block): Check for size overflow.
	(big_block::size, big_block::align): Adjust to use aligned_size.
	(big_block::alloc_size): Use aligned_ceil.
	(munge_options): Use aligned_ceil.
	(__pool_resource::allocate): Use big_block::align for alignment.
	* testsuite/20_util/monotonic_buffer_resource/allocate.cc: Check
	upstream resource gets expected values for impossible sizes.
	* testsuite/20_util/unsynchronized_pool_resource/allocate.cc:
	Likewise. Adjust checks for expected alignment in existing test.

2020-09-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (duration::_S_gcd): Use invariant that
	neither value is zero initially.

2020-09-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (__box): Simplify constraints as per LWG 3477.

2020-09-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96592
	* include/std/tuple (_TupleConstraints<true, T...>): Use
	alternative is_constructible instead of std::is_constructible.
	* testsuite/20_util/tuple/cons/96592.cc: New test.

2020-09-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (duration::_S_gcd): Use iterative algorithm
	for C++14 and later.
	* include/std/numeric (__detail::__gcd): Replace recursive
	Euclidean algorithm with iterative version of binary GCD algorithm.
	* testsuite/26_numerics/gcd/1.cc: Test additional inputs.
	* testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error lines.
	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.
	* testsuite/experimental/numeric/gcd.cc: Test additional inputs.
	* testsuite/26_numerics/gcd/2.cc: New test.

2020-09-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92978
	* testsuite/experimental/numeric/92978.cc: Use experimental::lcm
	not std::lcm.

2020-09-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96851
	* include/bits/cpp_type_traits.h (__is_memcmp_ordered):
	New trait that says if memcmp can be used for ordering.
	(__is_memcmp_ordered_with): Likewise, for two types.
	* include/bits/deque.tcc (__lex_cmp_dit): Use new traits
	instead of __is_byte and __numeric_traits.
	(__lexicographical_compare_aux1): Likewise.
	* include/bits/ranges_algo.h (__lexicographical_compare_fn):
	Likewise.
	* include/bits/stl_algobase.h (__lexicographical_compare_aux1)
	(__is_byte_iter): Likewise.
	* include/std/array (operator<=>): Likewise. Only use memcmp
	when std::is_constant_evaluated() is false.
	* testsuite/23_containers/array/comparison_operators/96851.cc:
	New test.
	* testsuite/23_containers/array/tuple_interface/get_neg.cc:
	Adjust dg-error line numbers.

2020-09-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h: Include <bits/exception_defines.h>
	for definitions of __try, __catch and __throw_exception_again.
	(counted_iterator::operator++(int)): Use __throw_exception_again
	instead of throw.
	* libsupc++/new: Include <bits/exception.h> not <exception>.
	* libsupc++/new_opvnt.cc: Include <bits/exception_defines.h>.
	* testsuite/18_support/destroying_delete.cc: Include
	<type_traits> for std::is_same_v definition.
	* testsuite/20_util/variant/index_type.cc: Qualify size_t.

2020-09-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/71960
	* include/bits/c++config (__glibcxx_assert_impl): Remove
	do-while so that uses of the macro need to add it.
	(__glibcxx_assert): Rename macro for runtime assertions
	to __glibcxx_assert_2.
	(__glibcxx_assert_1): Define macro for constexpr assertions.
	(__glibcxx_assert): Define macro for constexpr and runtime
	assertions.
	* include/bits/range_access.h (ranges::advance): Remove
	redundant precondition checks during constant evaluation.
	* include/parallel/base.h (_GLIBCXX_PARALLEL_ASSERT): Always
	use do-while in macro expansion.
	* include/std/ranges (iota_view::iota_view(W, B)): Remove
	redundant braces.

2020-09-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (duration::_S_gcd(intmax_t, intmax_t)):
	New helper function for finding GCD of two positive intmax_t
	values.
	(duration::__divide): New helper alias for dividing one period
	by another.
	(duration::__is_harmonic): Use __divide not ratio_divide.
	(duration(const duration<R2, P2>&)): Require the duration rep
	types to be convertible.
	* testsuite/20_util/duration/cons/dr2094.cc: New test.
	* testsuite/20_util/duration/requirements/reduced_period.cc:
	Fix definition of unused member functions in test type.
	* testsuite/20_util/duration/requirements/typedefs_neg2.cc:
	Adjust expected errors.

2020-08-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/numeric (__detail::__absu(bool)): Make deleted
	function a function template, so it will be chosen for calls
	with an explicit template argument list.
	* testsuite/26_numerics/gcd/gcd_neg.cc: Add dg-prune-output.
	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.

2020-08-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (common_type): Fix partial specializations
	for a single duration type to use the common_type of the rep.
	(duration::operator+, duration::operator-): Fix return types
	to also use the common_type of the rep.
	* testsuite/20_util/duration/requirements/reduced_period.cc:
	Check duration using a rep that has common_type specialized.

2020-08-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92978
	* include/std/numeric (__abs_integral): Replace with ...
	(__detail::__absu): New function template that returns an
	unsigned type, guaranteeing it can represent the most
	negative signed value.
	(__detail::__gcd, __detail::__lcm): Require arguments to
	be unsigned and therefore already non-negative.
	(gcd, lcm): Convert arguments to absolute value as unsigned
	type before calling __detail::__gcd or __detail::__lcm.
	* include/experimental/numeric (gcd, lcm): Likewise.
	* testsuite/26_numerics/gcd/gcd_neg.cc: Adjust expected
	errors.
	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.
	* testsuite/26_numerics/gcd/92978.cc: New test.
	* testsuite/26_numerics/lcm/92978.cc: New test.
	* testsuite/experimental/numeric/92978.cc: New test.

2020-08-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (__duration_common_type): Ensure the
	reduced ratio is used. Remove unused partial specialization
	using __failure_type.
	(common_type): Pass reduced ratios to __duration_common_type.
	Add partial specializations for simple cases involving a single
	duration or time_point type.
	(duration::period): Use reduced ratio.
	(duration::operator+(), duration::operator-()): Return duration
	type using the reduced ratio.
	* testsuite/20_util/duration/requirements/typedefs_neg2.cc:
	Adjust expected errors.
	* testsuite/20_util/duration/requirements/reduced_period.cc: New test.

2020-08-27  Patrick Palka  <ppalka@redhat.com>

	* include/std/chrono (year_month::operator+): Properly handle a
	month value of 0 by casting the month value to int before
	subtracting 1 from it so that the difference is sign-extended in
	the subsequent addition.
	* testsuite/std/time/year_month/1.cc: Test adding months to a
	year_month whose month component is below or above the
	normalized range of [1,12].

2020-08-27  Patrick Palka  <ppalka@redhat.com>

	* include/std/chrono
	(__detail::__months_years_conversion_disambiguator): Define.
	(year_month::operator+=): Templatize the 'months'-based overload
	so that the 'years'-based overload is selected in case of
	equally-ranked implicit conversion sequences to both 'months'
	and 'years' from the supplied argument.
	(year_month::operator-=): Likewise.
	(year_month::operator+): Likewise.
	(year_month::operator-): Likewise.
	(year_month_day::operator+=): Likewise.
	(year_month_day::operator-=): Likewise.
	(year_month_day::operator+): Likewise.
	(year_month_day::operator-): Likewise.
	(year_month_day_last::operator+=): Likewise.
	(year_month_day_last::operator-=): Likewise.
	(year_month_day_last::operator+): Likewise
	(year_month_day_last::operator-): Likewise.
	(year_month_day_weekday::operator+=): Likewise
	(year_month_day_weekday::operator-=): Likewise.
	(year_month_day_weekday::operator+): Likewise.
	(year_month_day_weekday::operator-): Likewise.
	(year_month_day_weekday_last::operator+=): Likewise
	(year_month_day_weekday_last::operator-=): Likewise.
	(year_month_day_weekday_last::operator+): Likewise.
	(year_month_day_weekday_last::operator-): Likewise.
	(testsuite/std/time/year_month/2.cc): New test.
	(testsuite/std/time/year_month_day/2.cc): New test.
	(testsuite/std/time/year_month_day_last/2.cc): New test.
	(testsuite/std/time/year_month_weekday/2.cc): New test.
	(testsuite/std/time/year_month_weekday_last/2.cc): New test.
	* testsuite/std/time/year_month/2.cc: New file.
	* testsuite/std/time/year_month_day/2.cc: New file.
	* testsuite/std/time/year_month_day_last/2.cc: New file.
	* testsuite/std/time/year_month_weekday/2.cc: New file.
	* testsuite/std/time/year_month_weekday_last/2.cc: New file.

2020-08-27  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/95322
	* include/std/ranges (transform_view::sentinel::__distance_from):
	Give this a deduced return type.
	(transform_view::sentinel::operator-): Adjust the return type so
	that it's based on the constness of the iterator rather than
	that of the sentinel.
	* testsuite/std/ranges/adaptors/95322.cc: Refer to LWG 3488.

2020-08-27  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (elements_view::begin): Adjust constraints.
	(elements_view::end): Likewise.
	(elements_view::_Sentinel::operator==): Templatize to take both
	_Iterator<true> and _Iterator<false>.
	(elements_view::_Sentinel::operator-): Likewise.
	* testsuite/std/ranges/adaptors/elements.cc: Add testcase for
	the example from P1994R1.
	* testsuite/std/ranges/adaptors/lwg3406.cc: New test.

2020-08-27  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (elements_view::end): Replace these two
	overloads with four new overloads.
	(elements_view::_Iterator::operator==): Remove.
	(elements_view::_Iterator::operator-): Likewise.
	(elements_view::_Sentinel): Define.

2020-08-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/tuple (_Tuple_impl): Whitespaces changes for
	consistent indentation. Also use __enable_if_t alias template.

2020-08-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96803
	* include/std/tuple
	(_Tuple_impl(allocator_arg_t, Alloc, const _Tuple_impl<U...>&)):
	Replace parameter pack with a type parameter and a pack and pass
	the first type to __use_alloc.
	* testsuite/20_util/tuple/cons/96803.cc: New test.

2020-08-26  Patrick Palka  <ppalka@redhat.com>

	* include/std/chrono (year_month_weekday::operator==): Compare
	weekday_indexed instead of weekday.
	* testsuite/std/time/year_month_weekday/1.cc: Augment testcase.

2020-08-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/hashtable_policy.h (_Hash_code_base): Change
	index of _Hashtable_ebo_helper base class.
	* testsuite/23_containers/unordered_map/dup_types.cc: New test.

2020-08-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/71960
	* include/experimental/string_view (basic_string_view):
	Enable debug assertions.
	* include/std/string_view (basic_string_view):
	Likewise.

2020-08-26  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable_policy.h (_Hashtable<>): Rename _H1 into _Hash
	_H2 into _RangeHash and _Hash into _Unused.
	(_Hastable_base<>): Likewise.
	(_Map_base<>): Likewise.
	(_Insert_base<>): Likewise.
	(_Insert<>): Likewise.
	(_Rehash_base<>): Likewise.
	(_Local_iterator_base<>): Likewise.
	(_Hash_code_base<>): Likewise.
	(_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, _Hash, false>):
	Remove.
	(_Hash_code_base<_Key, _Value, _ExtractKey, _H1, _H2, _Hash, true>):
	Remove.
	(_Hash_code_base<_Key, _Value, _ExtractKey, _Hash, _RangeHas, _Unused,
	bool>): Remove _Hashtable_ebo_helper<2, _RangeHash> base type..
	(_Hash_code_base<>::_M_bucket_index(const _Key&, __hash_code, size_t)):
	Replace by...
	(_Hash_code_base<>::_M_bucket_index(__hash_code, size_t)): ...this.
	(_Local_iterator<>): Remove _H1 and _H2 template parameters.
	(_Local_const_iterator<>): Likewise.
	(_Equality<>): Likewise.
	(_Map_base<>::operator[](const key_type&): Adapt.
	(_Map_base<>::operator[](key_type&&): Adapt.
	(_Identity::operator()): Add noexcept.
	(_Select1st::operator()): Likewise.
	(_Hash_code_base<>): Remove _Hashtable_ebo_helper<0, _ExtractKey> base
	type.
	(_Hash_code_base::_M_extract): Remove.
	* include/bits/hashtable.h (_Hashtable<>): Remove _H1 and _H2 template
	parameters. Remove _ExtractKey from constructors.
	(_Hashtable<>::_M_insert_unique_node(const key_type&, size_t,
	__hash_code, __node_type*, size_t)): Replace by...
	(_Hashtable<>::_M_insert_unique_node(size_t, __hash_code,
	 __node_type*, size_t)): ...this.
	(_Hashtable<>::_M_insert_muti_node(__node_type*, const key_type&,
	__hash_code, __node_type*)): Replace by...
	(_Hashtable<>::_M_insert_multi_node(__node_type*, __hash_code,
	__node_type*)): ...this.
	(_Hashtable<>::__key_extract): Remove.
	* include/bits/node_handle.h: Adapt.

2020-08-25  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/21_strings/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/deque/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/deque/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/forward_list/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/forward_list/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/list/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/list/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/map/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/map/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multimap/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multimap/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multiset/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/multiset/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/set/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/set/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_map/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_map/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_multimap/debug/iterator_self_move_assign_neg.cc:
	Removed.
	* testsuite/23_containers/unordered_multimap/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_multiset/debug/iterator_self_move_assign_neg.cc:
	Removed.
	* testsuite/23_containers/unordered_multiset/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_set/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/unordered_set/debug/self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/vector/debug/iterator_self_move_assign_neg.cc: Removed.
	* testsuite/23_containers/vector/debug/self_move_assign_neg.cc: Removed.

2020-08-25  Patrick Palka  <ppalka@redhat.com>

	* include/std/chrono (year_month_weekday::ok): Fix assert.

2020-08-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/future (future, shared_future. promise): Add
	is_destructible assertion (LWG 3466). Adjust string-literal for
	!is_array and !is_function assertions.
	* testsuite/30_threads/future/requirements/lwg3458.cc: Check
	types with no accessible destructor. Adjust expected errors.
	* testsuite/30_threads/promise/requirements/lwg3466.cc:
	Likewise.
	* testsuite/30_threads/shared_future/requirements/lwg3458.cc:
	Likewise.

2020-08-25  Patrick Palka  <ppalka@redhat.com>
	    Ed Smith-Rowland  <3dw4rd@verizon.net>
	    Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (time_point::operator++)
	(time_point::operator--): Define.
	(utc_clock, tai_clock, gps_clock): Forward declare.
	(utc_time, utc_seconds, tai_time, tai_seconds, gps_time)
	(gps_seconds): Define.
	(is_clock<utc_clock>, is_clock<tai_clock>, is_clock<gps_clock>)
	(is_clock_v<utc_clock>, is_clock_v<tai_clock>)
	(is_clock_v<gps_clock>): Define these specializations.
	(leap_second_info): Define.
	(day, month, year, weekday, weekday_indexed)
	(weekday_last, month_day, month_day_last, month_weekday)
	(month_weekday_last, year_month, year_month_day)
	(year_month_day_last, year_month_weekday, year_month_weekday_last):
	Declare and later define.
	(last_spec, last, __detail::__days_per_month)
	(__detail::__days_per_month, __detail::__last_day): Define.
	(January, February, March, April, May, June, July, August)
	(September, October, November, December, Sunday, Monday, Tuesday)
	(Wednesday, Thursday, Friday, Saturday): Define.
	(weekday::operator[]): Define out-of-line.
	(year_month_day::_S_from_days, year_month_day::M_days_since_epoch):
	Likewise.
	(year_month_day::year_month_day, year_month_day::ok): Likewise.
	(__detail::__pow10, hh_mm_ss): Define.
	(literals::chrono_literals::operator""d)
	(literals::chrono_literals::operator""y): Define.
	(is_am, is_pm, make12, make24): Define.
	* testsuite/20_util/time_point/4.cc: New test.
	* testsuite/std/time/day/1.cc: New test.
	* testsuite/std/time/hh_mm_ss/1.cc: New test.
	* testsuite/std/time/is_am/1.cc: New test.
	* testsuite/std/time/is_pm/1.cc: New test.
	* testsuite/std/time/make12/1.cc: New test.
	* testsuite/std/time/make24/1.cc: New test.
	* testsuite/std/time/month/1.cc: New test.
	* testsuite/std/time/month_day/1.cc: New test.
	* testsuite/std/time/month_day_last/1.cc: New test.
	* testsuite/std/time/month_weekday/1.cc: New test.
	* testsuite/std/time/month_weekday_last/1.cc: New test.
	* testsuite/std/time/weekday/1.cc: New test.
	* testsuite/std/time/weekday_indexed/1.cc: New test.
	* testsuite/std/time/weekday_last/1.cc: New test.
	* testsuite/std/time/year/1.cc: New test.
	* testsuite/std/time/year_month/1.cc: New test.
	* testsuite/std/time/year_month_day/1.cc: New test.
	* testsuite/std/time/year_month_day_last/1.cc: New test.
	* testsuite/std/time/year_month_weekday/1.cc: New test.
	* testsuite/std/time/year_month_weekday_last/1.cc: New test.

2020-08-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (join_view): Add deduction guide (LWG 3474).
	* testsuite/std/ranges/adaptors/join_lwg3474.cc: New test.

2020-08-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (indirectly_readable): Add
	partial specializations to resolve ambiguities (LWG 3446).
	* testsuite/24_iterators/associated_types/readable.traits.cc:
	Check types with both value_type and element_type.

2020-08-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (ranges::iota_view::size()): Perform all
	calculations in the right unsigned types.
	* testsuite/std/ranges/iota/size.cc: New test.

2020-08-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96766
	* include/std/variant (_Variant_storage): Replace implicit
	conversions from size_t to __index_type with explicit casts.

2020-08-24  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/packaged_task/cons/alloc.cc: Run for
	C++11 and skip for C++17 or later.

2020-08-24  Corentin Gay  <gay@adacore.com>

	* testsuite/20_util/shared_ptr/atomic/3.cc: Do not require POSIX
	threads and add -pthread only on targets supporting them.
	* testsuite/20_util/shared_ptr/thread/default_weaktoshared.cc:
	Likewise.
	* testsuite/20_util/shared_ptr/thread/mutex_weaktoshared.cc:
	Likewise.
	* testsuite/30_threads/async/42819.cc: Likewise.
	* testsuite/30_threads/async/49668.cc: Likewise.
	* testsuite/30_threads/async/54297.cc: Likewise.
	* testsuite/30_threads/async/any.cc: Likewise.
	* testsuite/30_threads/async/async.cc: Likewise.
	* testsuite/30_threads/async/except.cc: Likewise.
	* testsuite/30_threads/async/launch.cc: Likewise.
	* testsuite/30_threads/async/lwg2021.cc: Likewise.
	* testsuite/30_threads/async/sync.cc: Likewise. : Likewise.
	* testsuite/30_threads/call_once/39909.cc: Likewise.
	* testsuite/30_threads/call_once/49668.cc: Likewise.
	* testsuite/30_threads/call_once/60497.cc: Likewise.
	* testsuite/30_threads/call_once/call_once1.cc: Likewise.
	* testsuite/30_threads/call_once/dr2442.cc: Likewise.
	* testsuite/30_threads/condition_variable/54185.cc: Likewise.
	* testsuite/30_threads/condition_variable/cons/1.cc: Likewise.
	* testsuite/30_threads/condition_variable/members/1.cc: Likewise.
	* testsuite/30_threads/condition_variable/members/2.cc: Likewise.
	* testsuite/30_threads/condition_variable/members/3.cc: Likewise.
	* testsuite/30_threads/condition_variable/members/53841.cc: Likewise.
	* testsuite/30_threads/condition_variable/members/68519.cc: Likewise.
	* testsuite/30_threads/condition_variable/native_handle/typesizes.cc:
	Likewise.
	* testsuite/30_threads/condition_variable_any/50862.cc: Likewise.
	* testsuite/30_threads/condition_variable_any/53830.cc: Likewise.
	* testsuite/30_threads/condition_variable_any/cond.cc: Likewise.
	* testsuite/30_threads/condition_variable_any/cons/1.cc: Likewise.
	* testsuite/30_threads/condition_variable_any/members/1.cc: Likewise.
	* testsuite/30_threads/condition_variable_any/members/2.cc: Likewise.
	* testsuite/30_threads/future/cons/move.cc: Likewise.
	* testsuite/30_threads/future/members/45133.cc: Likewise.
	* testsuite/30_threads/future/members/get.cc: Likewise.
	* testsuite/30_threads/future/members/get2.cc: Likewise.
	* testsuite/30_threads/future/members/share.cc: Likewise.
	* testsuite/30_threads/future/members/valid.cc: Likewise.
	* testsuite/30_threads/future/members/wait.cc: Likewise.
	* testsuite/30_threads/future/members/wait_for.cc: Likewise.
	* testsuite/30_threads/future/members/wait_until.cc: Likewise.
	* testsuite/30_threads/lock/1.cc: Likewise.
	* testsuite/30_threads/lock/2.cc: Likewise.
	* testsuite/30_threads/lock/3.cc: Likewise.
	* testsuite/30_threads/lock/4.cc: Likewise.
	* testsuite/30_threads/mutex/cons/1.cc: Likewise.
	* testsuite/30_threads/mutex/dest/destructor_locked.cc: Likewise.
	* testsuite/30_threads/mutex/lock/1.cc: Likewise.
	* testsuite/30_threads/mutex/native_handle/1.cc: Likewise.
	* testsuite/30_threads/mutex/native_handle/typesizes.cc: Likewise.
	* testsuite/30_threads/mutex/try_lock/1.cc: Likewise.
	* testsuite/30_threads/mutex/try_lock/2.cc: Likewise.
	* testsuite/30_threads/mutex/unlock/1.cc: Likewise.
	* testsuite/30_threads/mutex/unlock/2.cc: Likewise.
	* testsuite/30_threads/packaged_task/49668.cc: Likewise.
	* testsuite/30_threads/packaged_task/60564.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/1.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/2.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/3.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/56492.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/alloc.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/move.cc: Likewise.
	* testsuite/30_threads/packaged_task/cons/move_assign.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/at_thread_exit.cc:
	Likewise.
	* testsuite/30_threads/packaged_task/members/get_future.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/get_future2.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/invoke.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/invoke2.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/invoke3.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/invoke4.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/invoke5.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/reset.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/reset2.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/swap.cc: Likewise.
	* testsuite/30_threads/packaged_task/members/valid.cc: Likewise.
	* testsuite/30_threads/promise/60966.cc: Likewise.
	* testsuite/30_threads/promise/cons/1.cc: Likewise.
	* testsuite/30_threads/promise/cons/alloc.cc: Likewise.
	* testsuite/30_threads/promise/cons/move.cc: Likewise.
	* testsuite/30_threads/promise/cons/move_assign.cc: Likewise.
	* testsuite/30_threads/promise/members/at_thread_exit.cc: Likewise.
	* testsuite/30_threads/promise/members/at_thread_exit2.cc: Likewise.
	* testsuite/30_threads/promise/members/get_future.cc: Likewise.
	* testsuite/30_threads/promise/members/get_future2.cc: Likewise.
	* testsuite/30_threads/promise/members/set_exception.cc: Likewise.
	* testsuite/30_threads/promise/members/set_exception2.cc: Likewise.
	* testsuite/30_threads/promise/members/set_value.cc: Likewise.
	* testsuite/30_threads/promise/members/set_value2.cc: Likewise.
	* testsuite/30_threads/promise/members/set_value3.cc: Likewise.
	* testsuite/30_threads/promise/members/swap.cc: Likewise.
	* testsuite/30_threads/recursive_mutex/cons/1.cc: Likewise.
	* testsuite/30_threads/recursive_mutex/dest/destructor_locked.cc:
	Likewise.
	* testsuite/30_threads/recursive_mutex/lock/1.cc: Likewise.
	* testsuite/30_threads/recursive_mutex/native_handle/1.cc: Likewise.
	* testsuite/30_threads/recursive_mutex/native_handle/typesizes.cc:
	Likewise.
	* testsuite/30_threads/recursive_mutex/try_lock/1.cc: Likewise.
	* testsuite/30_threads/recursive_mutex/try_lock/2.cc: Likewise.
	* testsuite/30_threads/recursive_mutex/unlock/1.cc: Likewise.
	* testsuite/30_threads/recursive_mutex/unlock/2.cc: Likewise.
	* testsuite/30_threads/recursive_timed_mutex/cons/1.cc: Likewise.
	* testsuite/30_threads/recursive_timed_mutex/dest/destructor_locked.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/lock/1.cc: Likewise.
	* testsuite/30_threads/recursive_timed_mutex/lock/2.cc: Likewise.
	* testsuite/30_threads/recursive_timed_mutex/native_handle/1.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/native_handle/typesizes.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock/1.cc: Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock/2.cc: Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_for/1.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_for/2.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_for/3.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_until/1.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_until/2.cc:
	Likewise.
	* testsuite/30_threads/recursive_timed_mutex/unlock/1.cc: Likewise.
	* testsuite/30_threads/recursive_timed_mutex/unlock/2.cc: Likewise.
	* testsuite/30_threads/shared_future/cons/move.cc: Likewise.
	* testsuite/30_threads/shared_future/members/45133.cc: Likewise.
	* testsuite/30_threads/shared_future/members/get.cc: Likewise.
	* testsuite/30_threads/shared_future/members/get2.cc: Likewise.
	* testsuite/30_threads/shared_future/members/valid.cc: Likewise.
	* testsuite/30_threads/shared_future/members/wait.cc: Likewise.
	* testsuite/30_threads/shared_future/members/wait_for.cc: Likewise.
	* testsuite/30_threads/shared_future/members/wait_until.cc: Likewise.
	* testsuite/30_threads/shared_lock/cons/1.cc: Likewise.
	* testsuite/30_threads/shared_lock/cons/2.cc: Likewise.
	* testsuite/30_threads/shared_lock/cons/3.cc: Likewise.
	* testsuite/30_threads/shared_lock/cons/4.cc: Likewise.
	* testsuite/30_threads/shared_lock/cons/5.cc: Likewise.
	* testsuite/30_threads/shared_lock/cons/6.cc: Likewise.
	* testsuite/30_threads/shared_lock/locking/1.cc: Likewise.
	* testsuite/30_threads/shared_lock/locking/2.cc: Likewise.
	* testsuite/30_threads/shared_lock/locking/3.cc: Likewise.
	* testsuite/30_threads/shared_lock/locking/4.cc: Likewise.
	* testsuite/30_threads/shared_lock/modifiers/1.cc: Likewise.
	* testsuite/30_threads/shared_mutex/cons/1.cc: Likewise.
	* testsuite/30_threads/shared_mutex/try_lock/1.cc: Likewise.
	* testsuite/30_threads/shared_mutex/try_lock/2.cc: Likewise.
	* testsuite/30_threads/shared_mutex/unlock/1.cc: Likewise.
	* testsuite/30_threads/shared_timed_mutex/cons/1.cc: Likewise.
	* testsuite/30_threads/shared_timed_mutex/try_lock/1.cc: Likewise.
	* testsuite/30_threads/shared_timed_mutex/try_lock/2.cc: Likewise.
	* testsuite/30_threads/shared_timed_mutex/try_lock/3.cc: Likewise.
	* testsuite/30_threads/shared_timed_mutex/unlock/1.cc: Likewise.
	* testsuite/30_threads/this_thread/1.cc: Likewise.
	* testsuite/30_threads/this_thread/sleep_for-mt.cc: Likewise.
	* testsuite/30_threads/this_thread/sleep_until-mt.cc: Likewise.
	* testsuite/30_threads/thread/cons/1.cc: Likewise.
	* testsuite/30_threads/thread/cons/2.cc: Likewise.
	* testsuite/30_threads/thread/cons/3.cc: Likewise.
	* testsuite/30_threads/thread/cons/4.cc: Likewise.
	* testsuite/30_threads/thread/cons/49668.cc: Likewise.
	* testsuite/30_threads/thread/cons/5.cc: Likewise.
	* testsuite/30_threads/thread/cons/6.cc: Likewise.
	* testsuite/30_threads/thread/cons/7.cc: Likewise.
	* testsuite/30_threads/thread/cons/8.cc: Likewise.
	* testsuite/30_threads/thread/cons/9.cc: Likewise.
	* testsuite/30_threads/thread/cons/moveable.cc: Likewise.
	* testsuite/30_threads/thread/cons/terminate.cc: Likewise.
	* testsuite/30_threads/thread/members/1.cc: Likewise.
	* testsuite/30_threads/thread/members/2.cc: Likewise.
	* testsuite/30_threads/thread/members/3.cc: Likewise.
	* testsuite/30_threads/thread/members/4.cc: Likewise.
	* testsuite/30_threads/thread/members/5.cc: Likewise.
	* testsuite/30_threads/thread/members/hardware_concurrency.cc:
	Likewise.
	* testsuite/30_threads/thread/native_handle/typesizes.cc: Likewise.
	* testsuite/30_threads/thread/swap/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/cons/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/dest/destructor_locked.cc:
	Likewise.
	* testsuite/30_threads/timed_mutex/lock/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/native_handle/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/native_handle/typesizes.cc:
	Likewise.
	* testsuite/30_threads/timed_mutex/try_lock/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock/2.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock_for/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock_for/2.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock_for/3.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock_until/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock_until/2.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock_until/57641.cc: Likewise.
	* testsuite/30_threads/timed_mutex/unlock/1.cc: Likewise.
	* testsuite/30_threads/timed_mutex/unlock/2.cc: Likewise.
	* testsuite/30_threads/try_lock/1.cc: Likewise.
	* testsuite/30_threads/try_lock/2.cc: Likewise.
	* testsuite/30_threads/try_lock/3.cc: Likewise.
	* testsuite/30_threads/try_lock/4.cc: Likewise.
	* testsuite/30_threads/unique_lock/cons/1.cc: Likewise.
	* testsuite/30_threads/unique_lock/cons/2.cc: Likewise.
	* testsuite/30_threads/unique_lock/cons/3.cc: Likewise.
	* testsuite/30_threads/unique_lock/cons/4.cc: Likewise.
	* testsuite/30_threads/unique_lock/cons/5.cc: Likewise.
	* testsuite/30_threads/unique_lock/cons/6.cc: Likewise.
	* testsuite/30_threads/unique_lock/locking/1.cc: Likewise.
	* testsuite/30_threads/unique_lock/locking/2.cc: Likewise.
	* testsuite/30_threads/unique_lock/locking/3.cc: Likewise.
	* testsuite/30_threads/unique_lock/locking/4.cc: Likewise.
	* testsuite/30_threads/unique_lock/modifiers/1.cc: Likewise.

2020-08-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96736
	* testsuite/17_intro/headers/c++1998/all_attributes.cc: Do not
	test "cold" on darwin.
	* testsuite/17_intro/headers/c++2011/all_attributes.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2014/all_attributes.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2017/all_attributes.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2020/all_attributes.cc:
	Likewise.

2020-08-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96718
	* testsuite/25_algorithms/pstl/feature_test-2.cc: Require
	tbb-backend effective target.
	* testsuite/25_algorithms/pstl/feature_test-3.cc: Likewise.
	* testsuite/25_algorithms/pstl/feature_test-5.cc: Likewise.
	* testsuite/25_algorithms/pstl/feature_test.cc: Likewise.

2020-08-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h [__STRICT_ANSI__]
	(incrementable_traits<__int128>): Define specialization.
	(incrementable_traits<unsigned __int128>): Likewise.
	* testsuite/std/ranges/iota/96042.cc: Test iota_view with
	__int128.

2020-08-19  Jonathan Wakely  <jwakely@redhat.com>
	    Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/96042
	* include/bits/range_access.h (__detail::__to_unsigned_like):
	Do not use make_unsigned_t<T> in the return type, as it can
	result in an error before the integral<T> constraint is checked.
	[__STRICT_ANSI__]: Add overloads for 128-bit integer types.
	(__detail::__make_unsigned_like_t): Define as the return type
	of __to_unsigned_like.
	* testsuite/std/ranges/subrange/96042.cc: New test.

2020-08-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_tree.h (operator!=, operator>, operator<=)
	(operator>=): Remove deprecated functions.

2020-08-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96042
	* include/ext/numeric_traits.h (__is_integer_nonstrict): New
	trait which is true for 128-bit integers even in strict modes.
	(__numeric_traits_integer, __numeric_traits): Use
	__is_integer_nonstrict instead of __is_integer.
	* include/std/limits [__STRICT_ANSI__ && __SIZEOF_INT128__]
	(numeric_limits<__int128>, (numeric_limits<unsigned __int128>):
	Define.
	* testsuite/std/ranges/iota/96042.cc: New test.

2020-08-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (_GLIBCXX_DEPRECATED_SUGGEST)
	(_GLIBCXX11_DEPRECATED, _GLIBCXX11_DEPRECATED_SUGGEST)
	(_GLIBCXX17_DEPRECATED_SUGGEST, _GLIBCXX20_DEPRECATED_SUGGEST):
	Add new macros to comment.

2020-08-19  Patrick Palka  <ppalka@redhat.com>

	* include/Makefile.am (bits_headers): Add new header
	<bits/max_size_type.h>.
	* include/Makefile.in: Regenerate.
	* include/bits/iterator_concepts.h
	(ranges::__detail::__max_diff_type): Remove definition, replace
	with forward declaration of class __max_diff_type.
	(__detail::__max_size_type): Remove definition, replace with
	forward declaration of class __max_size_type.
	(__detail::__is_unsigned_int128, __is_signed_int128)
	(__is_int128): New concepts.
	(__detail::__is_integer_like): Accept __int128 and unsigned
	__int128.
	(__detail::__is_signed_integer_like): Accept __int128.
	* include/bits/max_size_type.h: New header.
	* include/bits/range_access.h: Include <bits/max_size_type.h>.
	(__detail::__to_unsigned_like): Two new overloads.
	* testsuite/std/ranges/iota/difference_type.cc: New test.
	* testsuite/std/ranges/iota/max_size_type.cc: New test.

2020-08-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (_GLIBCXX_DEPRECATED): Define for all
	standard modes.
	(_GLIBCXX_DEPRECATED_SUGGEST): New macro for "use 'foo' instead"
	message in deprecated warnings.
	(_GLIBCXX11_DEPRECATED, _GLIBCXX11_DEPRECATED_SUGGEST): New
	macros for marking features deprecated in C++11.
	(_GLIBCXX17_DEPRECATED_SUGGEST, _GLIBCXX20_DEPRECATED_SUGGEST):
	New macros.
	* include/backward/auto_ptr.h (auto_ptr_ref, auto_ptr<void>):
	Use _GLIBCXX11_DEPRECATED instead of _GLIBCXX_DEPRECATED.
	(auto_ptr): Use _GLIBCXX11_DEPRECATED_SUGGEST.
	* include/backward/binders.h (binder1st, binder2nd): Likewise.
	* include/bits/ios_base.h (io_state, open_mode, seek_dir)
	(streampos, streamoff): Use _GLIBCXX_DEPRECATED_SUGGEST.
	* include/std/streambuf (stossc): Replace C++11 attribute
	with _GLIBCXX_DEPRECATED_SUGGEST.
	* include/std/type_traits (__is_nullptr_t): Use
	_GLIBCXX_DEPRECATED_SUGGEST instead of _GLIBCXX_DEPRECATED.
	* testsuite/27_io/types/1.cc: Check for deprecated warnings.
	Also check for io_state, open_mode and seek_dir typedefs.

2020-08-19  Antony Polukhin  <antoshkka@gmail.com>

	PR libstdc++/71579
	* include/std/type_traits (invoke_result, is_nothrow_invocable_r)
	Add static_asserts to make sure that the argument of the type
	trait is not misused with incomplete types.
	(is_swappable_with, is_nothrow_swappable_with): Add static_asserts
	to make sure that the first and second arguments of the type trait
	are not misused with incomplete types.
	* testsuite/20_util/invoke_result/incomplete_neg.cc: New test.
	* testsuite/20_util/is_nothrow_invocable/incomplete_neg.cc: New test.
	* testsuite/20_util/is_nothrow_swappable/incomplete_neg.cc: New test.
	* testsuite/20_util/is_nothrow_swappable_with/incomplete_neg.cc: New
	test.
	* testsuite/20_util/is_swappable_with/incomplete_neg.cc: New test.

2020-08-18  David Edelsohn  <dje.gcc@gmail.com>
	    Clement Chigot  <clement.chigot@atos.net>

	* config/os/aix/t-aix: Add complementary mode object files to
	libsupc++.a

2020-08-18  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/headers/c++1998/all_attributes.cc: Check
	"cold" isn't used in the library. Also check <cxxabi.h>.
	* testsuite/17_intro/headers/c++2011/all_attributes.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2014/all_attributes.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2017/all_attributes.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2020/all_attributes.cc:
	Likewise.

2020-08-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/69724
	* include/std/future (__future_base::_S_make_deferred_state)
	(__future_base::_S_make_async_state): Remove.
	(__future_base::_Deferred_state): Change constructor to accept a
	parameter pack of arguments and forward them to the call
	wrapper.
	(__future_base::_Async_state_impl): Likewise. Replace lambda
	expression with a named member function.
	(async): Construct state object directly from the arguments,
	instead of using thread::__make_invoker, _S_make_deferred_state
	and _S_make_async_state. Move shared state into the returned
	future.
	* include/std/thread (thread::_Call_wrapper): New alias
	template for use by constructor and std::async.
	(thread::thread(Callable&&, Args&&...)): Create state object
	directly instead of using _S_make_state.
	(thread::__make_invoker, thread::__decayed_tuple)
	(thread::_S_make_state): Remove.
	* testsuite/30_threads/async/69724.cc: New test.

2020-08-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/55713
	PR libstdc++/71096
	PR libstdc++/93147
	* include/std/tuple [__has_cpp_attribute(no_unique_address)]
	(_Head_base<Idx, Head, true>): New definition of the partial
	specialization, using [[no_unique_address]] instead of
	inheritance.
	* testsuite/libstdc++-prettyprinters/48362.cc: Adjust expected
	output.
	* testsuite/20_util/tuple/comparison_operators/93147.cc: New test.
	* testsuite/20_util/tuple/creation_functions/55713.cc: New test.
	* testsuite/20_util/tuple/element_access/71096.cc: New test.

2020-08-14  Lewis Hyatt  <lhyatt@gmail.com>

	* testsuite/lib/libstdc++.exp: Use the new option
	-fdiagnostics-plain-output.

2020-08-13  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_CHEADERS): Warn if the c_std
	option is used and fail unless --enable-cheaders-obsolete is
	also used.
	* configure: Regenerate.

2020-08-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/85828
	* include/bits/basic_string.h (operator=(basic_string&&)): Check
	for self-move before copying with char_traits::copy.
	* include/bits/hashtable.h (operator=(_Hashtable&&)): Check for
	self-move.
	* include/bits/stl_deque.h (_M_move_assign1(deque&&, false_type)):
	Check for equal allocators.
	* include/bits/stl_list.h (_M_move_assign(list&&, true_type)):
	Call clear() instead of _M_clear().
	* include/debug/formatter.h (__msg_self_move_assign): Change
	comment.
	* include/debug/macros.h (__glibcxx_check_self_move_assign):
	(_GLIBCXX_DEBUG_VERIFY): Remove.
	* include/debug/safe_container.h (operator=(_Safe_container&&)):
	Remove assertion check for safe move and make it well-defined.
	* include/debug/safe_iterator.h (operator=(_Safe_iterator&&)):
	Remove assertion check for self-move.
	* include/debug/safe_local_iterator.h
	(operator=(_Safe_local_iterator&&)): Likewise.
	* testsuite/21_strings/basic_string/cons/char/self_move.cc: New test.
	* testsuite/23_containers/deque/cons/self_move.cc: New test.
	* testsuite/23_containers/forward_list/cons/self_move.cc: New test.
	* testsuite/23_containers/list/cons/self_move.cc: New test.
	* testsuite/23_containers/set/cons/self_move.cc: New test.
	* testsuite/23_containers/unordered_set/cons/self_move.cc: New test.
	* testsuite/23_containers/vector/cons/self_move.cc: New test.

2020-08-11  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/91620
	* include/bits/forward_list.tcc (forward_list<>::remove): Collect nodes
	to destroy in an intermediate forward_list.
	(forward_list<>::remove_if, forward_list<>::unique): Likewise.
	* include/bits/list.tcc (list<>::remove, list<>::unique): Likewise.
	(list<>::remove_if): Likewise.
	* include/debug/forward_list (forward_list<>::_M_erase_after): Remove.
	(forward_list<>::erase_after): Adapt.
	(forward_list<>::remove, forward_list<>::remove_if): Collect nodes to
	destroy in an intermediate forward_list.
	(forward_list<>::unique): Likewise.
	* include/debug/list (list<>::remove, list<>::unique): Likewise.
	(list<>::remove_if): Likewise.
	* testsuite/23_containers/forward_list/operations/91620.cc: New test.
	* testsuite/23_containers/list/operations/91620.cc: New test.

2020-08-11  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/thread/cons/84535.cc: Use a custom
	namespace.
	* testsuite/30_threads/thread/cons/lwg2097.cc: Likewise.

2020-08-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89760
	* include/experimental/executor [!_GLIBCXX_HAS_GTHREADS]:
	(execution_context::mutex_type): Define dummy mutex type.
	(system_context): Use execution_context::mutex_type.
	(system_context) [!_GLIBCXX_HAS_GTHREADS]: Define dummy
	thread and condition variable types.
	[!_GLIBCXX_HAS_GTHREADS] (system_context::_M_run()): Do not
	define.
	(system_context::_M_post) [!_GLIBCXX_HAS_GTHREADS]: Throw
	an exception when threads aren't available.
	(strand::running_in_this_thread()): Defer to _M_state.
	(strand::_State::running_in_this_thread()): New function.
	(use_future_t): Do not depend on _GLIBCXX_USE_C99_STDINT_TR1.
	* include/experimental/io_context (io_context): Use the
	execution_context::mutex_type alias. Replace stack of thread
	IDs with counter.
	* testsuite/experimental/net/execution_context/use_service.cc:
	Enable test for non-pthread targets.

2020-08-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/executor (system_context::a__tag): Make
	default constructor explicit.

2020-08-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/executor (system_context::_M_run()):
	Fix predicate.
	* testsuite/experimental/net/system_context/1.cc: New test.

2020-08-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stop_token: Check _GLIBCXX_HAS_GTHREADS using
	#ifdef instead of #if.
	(stop_token::_S_yield()): Check _GLIBCXX_HAS_GTHREADS before
	using __gthread_yield.

2020-08-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/thread [!_GLIBCXX_HAS_GTHREADS] (this_thread::yield)
	(this_thread::sleep_until): Define.
	[!_GLIBCXX_HAS_GTHREADS] (this_thread::sleep_for): Define. Replace
	use of __gthread_time_t typedef with timespec.
	* src/c++11/thread.cc [!_GLIBCXX_HAS_GTHREADS] (__sleep_for):
	Likewise.
	* testsuite/30_threads/this_thread/2.cc: Moved to...
	* testsuite/30_threads/this_thread/yield.cc: ...here.
	* testsuite/30_threads/this_thread/3.cc: Moved to...
	* testsuite/30_threads/this_thread/sleep_for-mt.cc: ...here.
	* testsuite/30_threads/this_thread/4.cc: Moved to...
	* testsuite/30_threads/this_thread/sleep_until-mt.cc: ...here.
	* testsuite/30_threads/this_thread/58038.cc: Add
	dg-require-sleep.
	* testsuite/30_threads/this_thread/60421.cc: Likewise.
	* testsuite/30_threads/this_thread/sleep_for.cc: New test.
	* testsuite/30_threads/this_thread/sleep_until.cc: New test.

2020-08-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94681
	* src/c++17/fs_ops.cc (read_symlink): Use posix::lstat instead
	of calling ::lstat directly.
	* src/filesystem/ops.cc (read_symlink): Likewise.

2020-08-10  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (UniquePointerPrinter.__init__):
	Use gdb.Type.strip_typedefs().
	* testsuite/libstdc++-prettyprinters/compat.cc: Use a typedef in
	the emulated old type.

2020-08-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94681
	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Do not depend on
	$enable_libstdcxx_filesystem_ts.
	* configure: Regenerate.

2020-08-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93904
	* include/bits/stl_iterator.h (inserter): Do not deduce
	iterator type (LWG 561).
	* testsuite/24_iterators/insert_iterator/dr561.cc: New test.

2020-08-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.tcc [_GLIBCXX_USE_CXX11_ABI=0]
	(basic_string::reserve()): Do nothing if exceptions are not
	enabled.

2020-08-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95749
	* src/filesystem/ops-common.h [_GLIBCXX_FILESYSTEM_IS_WINDOWS]
	(stat_type): Change to __stat64.
	(stat): Use _wstat64.

2020-08-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96303
	* include/debug/bitset (bitset::operator==): Call _M_base() on
	right operand.
	(bitset::operator!=): Likewise, but don't define it at all when
	default comparisons are supported by the compiler.
	* testsuite/23_containers/bitset/operations/96303.cc: New test.

2020-08-07  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/comparisons/algorithms/partial_order.cc:
	Replace VERIFY with static_assert where the compiler now
	allows it.
	* testsuite/18_support/comparisons/algorithms/weak_order.cc:
	Likewise.

2020-08-07  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver: Fix wildcards for wstring symbols.

2020-08-06  Andrew Luo  <andrewluotechnologies@outlook.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Use less greedy
	patterns for basic_string members.
	(GLIBCXX_3.4.29): Export new basic_string::reserve symbols.
	* doc/xml/manual/status_cxx2020.xml: Update P0966 status.
	* include/bits/basic_string.h (shrink_to_fit()): Call reserve().
	(reserve(size_type)): Remove default argument.
	(reserve()): Declare new overload.
	[!_GLIBCXX_USE_CXX11_ABI] (shrink_to_fit, reserve): Likewise.
	* include/bits/basic_string.tcc (reserve(size_type)): Remove
	support for shrinking capacity.
	(reserve()): Perform shrink-to-fit operation.
	[!_GLIBCXX_USE_CXX11_ABI] (reserve): Likewise.
	* testsuite/21_strings/basic_string/capacity/1.cc: Adjust to
	reflect new behavior.
	* testsuite/21_strings/basic_string/capacity/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/capacity/char/18654.cc:
	Likewise.
	* testsuite/21_strings/basic_string/capacity/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string/capacity/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/capacity/wchar_t/18654.cc:
	Likewise.
	* testsuite/21_strings/basic_string/capacity/wchar_t/2.cc:
	Likewise.

2020-08-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.tcc
	(operator>>(basic_istream&, basic_string&)): Do not set eofbit
	if extraction stopped after in.width() characters.
	* src/c++98/istream-string.cc (operator>>(istream&, string&)):
	Likewise.
	* include/bits/istream.tcc (__istream_extract): Do not set
	eofbit if extraction stopped after n-1 characters.
	* src/c++98/istream.cc (__istream_extract): Likewise.
	* testsuite/21_strings/basic_string/inserters_extractors/char/13.cc: New test.
	* testsuite/21_strings/basic_string/inserters_extractors/wchar_t/13.cc: New test.
	* testsuite/27_io/basic_istream/extractors_character/char/5.cc: New test.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/5.cc: New test.

2020-08-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96484
	* src/c++17/fs_ops.cc (fs::read_symlink): Return an error
	immediately for non-symlinks.
	* src/filesystem/ops.cc (fs::read_symlink): Likewise.

2020-08-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/istream (operator>>(istream&, char*)): Add
	attributes to get warnings for pointers that are null or known
	to point to the end of a buffer. Request upper bound from
	__builtin_object_size check and handle zero-sized buffer case.
	(operator>>(istream&, signed char))
	(operator>>(istream&, unsigned char*)): Add attributes.
	* testsuite/27_io/basic_istream/extractors_character/char/overflow.cc:
	Check extracting into the middle of a buffer.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/overflow.cc: New test.

2020-08-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/atomic (atomic<T>::store): Reformat.

2020-08-05  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2017.xml: Replace oneAPI DPC++ link
	with LLVM repo for PSTL.
	* doc/html/manual/status.html: Regenerate.

2020-08-05  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): Export new symbols.
	* include/bits/istream.tcc (__istream_extract): New function
	template implementing both of operator>>(istream&, char*) and
	operator>>(istream&, char(&)[N]). Add explicit instantiation
	declaration for it. Remove explicit instantiation declarations
	for old function templates.
	* include/std/istream (__istream_extract): Declare.
	(operator>>(basic_istream<C,T>&, C*)): Define inline and simply
	call __istream_extract.
	(operator>>(basic_istream<char,T>&, signed char*)): Likewise.
	(operator>>(basic_istream<char,T>&, unsigned char*)): Likewise.
	(operator>>(basic_istream<C,T>&, C(7)[N])): Define for LWG 2499.
	(operator>>(basic_istream<char,T>&, signed char(&)[N])):
	Likewise.
	(operator>>(basic_istream<char,T>&, unsigned char(&)[N])):
	Likewise.
	* include/std/streambuf (basic_streambuf): Declare char overload
	of __istream_extract as a friend.
	* src/c++11/istream-inst.cc: Add explicit instantiation
	definition for wchar_t overload of __istream_extract. Remove
	explicit instantiation definitions of old operator>> overloads
	for versioned-namespace build.
	* src/c++98/istream.cc (operator>>(istream&, char*)): Replace
	with __istream_extract(istream&, char*, streamsize).
	* testsuite/27_io/basic_istream/extractors_character/char/3.cc:
	Do not use variable-length array.
	* testsuite/27_io/basic_istream/extractors_character/char/4.cc:
	Do not run test for C++20.
	* testsuite/27_io/basic_istream/extractors_character/char/9555-ic.cc:
	Do not test writing to pointers for C++20.
	* testsuite/27_io/basic_istream/extractors_character/char/9826.cc:
	Use array instead of pointer.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/3.cc:
	Do not use variable-length array.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/4.cc:
	Do not run test for C++20.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/9555-ic.cc:
	Do not test writing to pointers for C++20.
	* testsuite/27_io/basic_istream/extractors_character/char/lwg2499.cc:
	New test.
	* testsuite/27_io/basic_istream/extractors_character/char/lwg2499_neg.cc:
	New test.
	* testsuite/27_io/basic_istream/extractors_character/char/overflow.cc:
	New test.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/lwg2499.cc:
	New test.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/lwg2499_neg.cc:
	New test.

2020-08-01  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/using_exceptions.xml: Move www.stroustrup.com to
	https.
	* doc/html/manual/using_exceptions.html: Regenerate.

2020-07-31  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/status_cxx2017.xml: ParallelSTL is now part
	of oneAPI DPC++ Library on Github.
	* doc/html/manual/status.html: Regenerate.

2020-07-31  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_bvector.h
	[_GLIBCXX_INLINE_VERSION](_Bvector_impl_data::_M_start): Define as
	_Bit_type*.
	(_Bvector_impl_data(const _Bvector_impl_data&)): Default.
	(_Bvector_impl_data(_Bvector_impl_data&&)): Delegate to latter.
	(_Bvector_impl_data::operator=(const _Bvector_impl_data&)): Default.
	(_Bvector_impl_data::_M_move_data(_Bvector_impl_data&&)): Use latter.
	(_Bvector_impl_data::_M_reset()): Likewise.
	(_Bvector_impl_data::_M_swap_data): New.
	(_Bvector_impl::_Bvector_impl(_Bvector_impl&&)): Implement explicitely.
	(_Bvector_impl::_Bvector_impl(_Bit_alloc_type&&, _Bvector_impl&&)): New.
	(_Bvector_base::_Bvector_base(_Bvector_base&&, const allocator_type&)):
	New, use latter.
	(vector::vector(vector&&, const allocator_type&, true_type)): New, use
	latter.
	(vector::vector(vector&&, const allocator_type&, false_type)): New.
	(vector::vector(vector&&, const allocator_type&)): Use latters.
	(vector::vector(const vector&, const allocator_type&)): Adapt.
	[__cplusplus >= 201103](vector::vector(_InputIt, _InputIt,
	const allocator_type&)): Use _M_initialize_range.
	(vector::operator[](size_type)): Use iterator operator[].
	(vector::operator[](size_type) const): Use const_iterator operator[].
	(vector::swap(vector&)): Add assertions on allocators. Use _M_swap_data.
	[__cplusplus >= 201103](vector::insert(const_iterator, _InputIt,
	_InputIt)): Use _M_insert_range.
	(vector::_M_initialize(size_type)): Adapt.
	[__cplusplus >= 201103](vector::_M_initialize_dispatch): Remove.
	[__cplusplus >= 201103](vector::_M_insert_dispatch): Remove.
	* python/libstdcxx/v6/printers.py (StdVectorPrinter._iterator): Stop
	using start _M_offset.
	(StdVectorPrinter.to_string): Likewise.
	* testsuite/23_containers/vector/bool/allocator/swap.cc: Adapt.
	* testsuite/23_containers/vector/bool/cons/noexcept_move_construct.cc:
	Add check.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_istream/ignore/char/94749.cc: Use 0
	instead of nullptr.
	* testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc:
	Likewise.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/specialized_algorithms/uninitialized_fill_n/sizes.cc:
	Move struct to namespace scope.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/numbers/float128.cc: Check
	__STRICT_ANSI__ before using __float128.
	* testsuite/std/concepts/concepts.lang/concept.arithmetic/floating_point.cc:
	Likewise.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/set_terminate.cc: Require C++11 or
	higher.
	* testsuite/28_regex/simple_c++11.cc: Likewise.
	* testsuite/tr1/headers/c++200x/complex.cc: Likewise.
	* testsuite/24_iterators/headers/iterator/synopsis.cc:
	Require C++14 or lower.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/span/back_assert_neg.cc: Split c++2a
	effective-target from xfail selector.
	* testsuite/23_containers/span/first_2_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/first_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/front_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/index_op_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/last_2_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/last_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/subspan_2_assert_neg.cc:
	Likewise.
	* testsuite/23_containers/span/subspan_3_assert_neg.cc:
	Likewise.
	* testsuite/23_containers/span/subspan_4_assert_neg.cc:
	Likewise.
	* testsuite/23_containers/span/subspan_5_assert_neg.cc:
	Likewise.
	* testsuite/23_containers/span/subspan_6_assert_neg.cc:
	Likewise.
	* testsuite/23_containers/span/subspan_assert_neg.cc: Likewise.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/reference_wrapper/83427.cc: Adjust
	effective-target to specific language mode only.
	* testsuite/24_iterators/headers/iterator/range_access_c++11.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/range_access_c++14.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/synopsis_c++11.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/synopsis_c++14.cc:
	Likewise.
	* testsuite/26_numerics/valarray/69116.cc:
	Likewise.
	* testsuite/30_threads/headers/condition_variable/std_c++0x_neg.cc:
	Remove whitespace at end of file.
	* testsuite/30_threads/headers/future/std_c++0x_neg.cc:
	Likewise.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/headers/c++2017/all_attributes.cc: Add
	c++17 effective-target.
	* testsuite/17_intro/headers/c++2017/all_no_exceptions.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2017/all_no_rtti.cc: Likewise.
	* testsuite/17_intro/headers/c++2017/all_pedantic_errors.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2017/operator_names.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2017/stdc++.cc: Likewise.
	* testsuite/17_intro/headers/c++2017/stdc++_multiple_inclusion.cc:
	Likewise.
	* testsuite/18_support/uncaught_exceptions/uncaught_exceptions.cc:
	Likewise.
	* testsuite/19_diagnostics/error_code/is_error_code_v.cc:
	Likewise.
	* testsuite/20_util/any/assign/1.cc: Likewise.
	* testsuite/20_util/any/assign/2.cc: Likewise.
	* testsuite/20_util/any/assign/emplace.cc: Likewise.
	* testsuite/20_util/any/assign/exception.cc: Likewise.
	* testsuite/20_util/any/assign/self.cc: Likewise.
	* testsuite/20_util/any/cons/1.cc: Likewise.
	* testsuite/20_util/any/cons/2.cc: Likewise.
	* testsuite/20_util/any/cons/aligned.cc: Likewise.
	* testsuite/20_util/any/cons/explicit.cc: Likewise.
	* testsuite/20_util/any/cons/in_place.cc: Likewise.
	* testsuite/20_util/any/cons/nontrivial.cc: Likewise.
	* testsuite/20_util/any/make_any.cc: Likewise.
	* testsuite/20_util/any/misc/any_cast.cc: Likewise.
	* testsuite/20_util/any/misc/any_cast_no_rtti.cc: Likewise.
	* testsuite/20_util/any/misc/swap.cc: Likewise.
	* testsuite/20_util/any/modifiers/1.cc: Likewise.
	* testsuite/20_util/any/observers/type.cc: Likewise.
	* testsuite/20_util/any/requirements.cc: Likewise.
	* testsuite/20_util/any/typedefs.cc: Likewise.
	* testsuite/20_util/as_const/1.cc: Likewise.
	* testsuite/20_util/as_const/rvalue_neg.cc: Likewise.
	* testsuite/20_util/bind/is_placeholder_v.cc: Likewise.
	* testsuite/20_util/bool_constant/requirements.cc: Likewise.
	* testsuite/20_util/duration/requirements/treat_as_floating_point_v.cc:
	Likewise.
	* testsuite/20_util/duration_cast/rounding.cc: Likewise.
	* testsuite/20_util/enable_shared_from_this/members/weak_from_this.cc:
	Likewise.
	* testsuite/20_util/function_objects/invoke/59768.cc: Likewise.
	* testsuite/20_util/function_objects/not_fn/1.cc: Likewise.
	* testsuite/20_util/function_objects/searchers.cc: Likewise.
	* testsuite/20_util/in_place/requirements.cc: Likewise.
	* testsuite/20_util/is_invocable/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/is_invocable/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_invocable/value.cc: Likewise.
	* testsuite/20_util/is_nothrow_invocable/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/is_nothrow_invocable/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_nothrow_swappable/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/is_nothrow_swappable/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_nothrow_swappable/value.cc: Likewise.
	* testsuite/20_util/is_nothrow_swappable_with/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/is_nothrow_swappable_with/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_nothrow_swappable_with/value.cc:
	Likewise.
	* testsuite/20_util/is_swappable/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/is_swappable/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_swappable/value.cc: Likewise.
	* testsuite/20_util/is_swappable_with/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/is_swappable_with/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_swappable_with/value.cc: Likewise.
	* testsuite/20_util/logical_traits/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/logical_traits/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/logical_traits/value.cc: Likewise.
	* testsuite/20_util/optional/constexpr/make_optional.cc: Likewise.
	* testsuite/20_util/optional/constexpr/observers/2.cc: Likewise.
	* testsuite/20_util/optional/constexpr/observers/3.cc: Likewise.
	* testsuite/20_util/optional/hash.cc: Likewise.
	* testsuite/20_util/pair/swap_cxx17.cc: Likewise.
	* testsuite/20_util/ratio/requirements/ratio_equal_v.cc: Likewise.
	* testsuite/20_util/shared_ptr/requirements/weak_type.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/memory_management_tools/1.cc:
	Likewise.
	* testsuite/20_util/tuple/apply/1.cc: Likewise.
	* testsuite/20_util/tuple/make_from_tuple/1.cc: Likewise.
	* testsuite/20_util/tuple/swap_cxx17.cc: Likewise.
	* testsuite/20_util/tuple/tuple_size_v.cc: Likewise.
	* testsuite/20_util/unique_ptr/specialized_algorithms/swap_cxx17.cc:
	Likewise.
	* testsuite/20_util/uses_allocator/requirements/uses_allocator_v.cc:
	Likewise.
	* testsuite/20_util/variant/any.cc: Likewise.
	* testsuite/20_util/variant/compile.cc: Likewise.
	* testsuite/20_util/variant/hash.cc: Likewise.
	* testsuite/20_util/variant/index_type.cc: Likewise.
	* testsuite/20_util/variant/run.cc: Likewise.
	* testsuite/20_util/void_t/1.cc: Likewise.
	* testsuite/21_strings/basic_string/79162.cc: Likewise.
	* testsuite/21_strings/basic_string/cons/char/7.cc: Likewise.
	* testsuite/21_strings/basic_string/cons/wchar_t/7.cc: Likewise.
	* testsuite/21_strings/basic_string/lwg2758.cc: Likewise.
	* testsuite/21_strings/basic_string/lwg2946.cc: Likewise.
	* testsuite/21_strings/basic_string/modifiers/append/char/4.cc:
	Likewise.
	* testsuite/21_strings/basic_string/modifiers/append/wchar_t/4.cc:
	Likewise.
	* testsuite/21_strings/basic_string/modifiers/assign/char/4.cc:
	Likewise.
	* testsuite/21_strings/basic_string/modifiers/assign/wchar_t/4.cc:
	Likewise.
	* testsuite/21_strings/basic_string/modifiers/insert/char/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string/modifiers/insert/wchar_t/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string/modifiers/replace/char/7.cc:
	Likewise.
	* testsuite/21_strings/basic_string/modifiers/replace/wchar_t/7.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operations/compare/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operations/compare/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operations/data/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operations/data/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operations/find/char/5.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operations/find/wchar_t/5.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operators/char/5.cc: Likewise.
	* testsuite/21_strings/basic_string/operators/wchar_t/5.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/capacity/1.cc: Likewise.
	* testsuite/21_strings/basic_string_view/cons/char/1.cc: Likewise.
	* testsuite/21_strings/basic_string_view/cons/char/2.cc: Likewise.
	* testsuite/21_strings/basic_string_view/cons/char/3.cc: Likewise.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/empty.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/front_back.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/empty.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/front_back.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/include.cc: Likewise.
	* testsuite/21_strings/basic_string_view/inserters/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/inserters/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/inserters/char/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/inserters/pod/10081-out.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/inserters/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/inserters/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/inserters/wchar_t/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/literals/types-char8_t.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/literals/types.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/literals/values-char8_t.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/literals/values.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/char/13650.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/wchar_t/13650.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/copy/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/data/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/data/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/char/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/char/4.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/wchar_t/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/find/wchar_t/4.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/char/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/rfind/wchar_t/3.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/string_conversion/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/substr/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/substr/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/range_access/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/range_access/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char16_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char32_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/char8_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/requirements/explicit_instantiation/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/requirements/typedefs.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/typedefs.cc: Likewise.
	* testsuite/21_strings/basic_string_view/types/1.cc: Likewise.
	* testsuite/23_containers/array/specialized_algorithms/swap_cxx17.cc:
	Likewise.
	* testsuite/23_containers/map/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/map/modifiers/insert_or_assign/1.cc:
	Likewise.
	* testsuite/23_containers/map/modifiers/merge.cc: Likewise.
	* testsuite/23_containers/map/modifiers/try_emplace/1.cc: Likewise.
	* testsuite/23_containers/multimap/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/multimap/modifiers/merge.cc: Likewise.
	* testsuite/23_containers/multiset/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/multiset/modifiers/merge.cc: Likewise.
	* testsuite/23_containers/set/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/set/modifiers/merge.cc: Likewise.
	* testsuite/23_containers/unordered_map/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_map/modifiers/insert_or_assign.cc:
	Likewise.
	* testsuite/23_containers/unordered_map/modifiers/merge.cc:
	Likewise.
	* testsuite/23_containers/unordered_map/modifiers/try_emplace.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/modifiers/merge.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/modifiers/merge.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/modifiers/merge.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/range_access_c++17.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/synopsis_c++17.cc:
	Likewise.
	* testsuite/25_algorithms/clamp/1.cc: Likewise.
	* testsuite/25_algorithms/clamp/2.cc: Likewise.
	* testsuite/25_algorithms/clamp/constexpr.cc: Likewise.
	* testsuite/25_algorithms/clamp/requirements/explicit_instantiation/1.cc:
	Likewise.
	* testsuite/25_algorithms/clamp/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/26_numerics/headers/cmath/functions_std_c++17.cc:
	Likewise.
	* testsuite/26_numerics/headers/cmath/special_functions_global.cc:
	Likewise.
	* testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc:
	Likewise.
	* testsuite/29_atomics/atomic/is_always_lock_free.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/is_always_lock_free.cc:
	Likewise.
	* testsuite/30_threads/shared_lock/70766.cc: Likewise.
	* testsuite/30_threads/shared_mutex/cons/1.cc: Likewise.
	* testsuite/30_threads/shared_mutex/cons/assign_neg.cc:
	Likewise.
	* testsuite/30_threads/shared_mutex/cons/copy_neg.cc:
	Likewise.
	* testsuite/30_threads/shared_mutex/requirements/standard_layout.cc:
	Likewise.
	* testsuite/30_threads/shared_mutex/try_lock/1.cc: Likewise.
	* testsuite/30_threads/shared_mutex/try_lock/2.cc: Likewise.
	* testsuite/30_threads/shared_mutex/unlock/1.cc: Likewise.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96382
	* include/bits/stl_iterator.h (reverse_iterator): Friend
	declaration should not depend on __cplusplus.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/filesystem/filesystem_error/cons.cc:
	Remove -std=gnu++17 option.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/is_aggregate/value.cc: Adjust for changes to
	definition of aggregates in C++20.
	* testsuite/20_util/optional/requirements.cc: Adjust for
	defaulted comparisons in C++20.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/tuple/78939.cc: Suppress warnings about
	deprecation of volatile-qualified structured bindings in C++20.
	* testsuite/20_util/variable_templates_for_traits.cc: Likewise
	for deprecation of is_pod in C++20

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/time_point_cast/rounding.cc: Remove
	duplicate dg-do directive and add c++17 effective target.

2020-07-31  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/floating_from_chars.cc (from_chars_impl): Use
	LC_ALL_MASK not LC_ALL.

2020-07-31  Richard Biener  <rguenther@suse.de>

	PR debug/96383
	* testsuite/20_util/assume_aligned/3.cc: Use -g0.

2020-07-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h (size_type, difference_type):
	Use allocator_traits to obtain the allocator's size_type and
	difference_type.

2020-07-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96279
	* src/c++17/floating_from_chars.cc (from_chars_impl): Use
	isinf unqualified.
	[!_GLIBCXX_USE_C99_STDLIB]: Use strtod for float and long
	double.

2020-07-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/unordered_multiset/cons/noexcept_default_construct.cc:
	Use allocator with the correct value type.
	* testsuite/23_containers/unordered_set/cons/noexcept_default_construct.cc:
	Likewise.

2020-07-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/from_chars/4.cc: Pass non-const iterator
	to string::insert.

2020-07-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (__detail::__cv_bool): New
	helper concept.
	(__detail::__integral_nonbool): Likewise.
	(__detail::__is_integer_like): Use __integral_nonbool.
	* testsuite/std/ranges/access/lwg3467.cc: New test.

2020-07-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/from_chars/4.cc: Use dg-add-options ieee.
	* testsuite/29_atomics/atomic_float/1.cc: Likewise.

2020-07-30  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/vector/bool/72847.cc: Use the
	exceptions_enabled effective-target keyword instead of
	checking for an explicit -fno-exceptions option.
	* testsuite/util/testsuite_abi.cc (examine_symbol): Remove
	redundant try-catch.
	* testsuite/util/testsuite_allocator.h [!__cpp_exceptions]:
	Do not define check_allocate_max_size and memory_resource.
	* testsuite/util/testsuite_containers.h: Replace comment with
	#error if wrong standard dialect used.
	* testsuite/util/testsuite_shared.cc: Likewise.

2020-07-29  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable_policy.h (_Node_iterator_base()): New.
	(operator==(const _Node_iterator_base&, const _Node_iterator_base&)):
	Make hidden friend.
	(operator!=(const _Node_iterator_base&, const _Node_iterator_base&)):
	Make hidden friend.
	(_Local_iterator_base<>): Inherits _Node_iterator_base.
	(_Local_iterator_base<>::_M_cur): Remove.
	(_Local_iterator_base<>::_M_curr()): Remove.
	(operator==(const _Local_iterator_base&, const _Local_iterator_base&)):
	Remove.
	(operator!=(const _Local_iterator_base&, const _Local_iterator_base&)):
	Remove.
	* include/debug/unordered_map (unordered_map<>::_M_invalidate): Adapt.
	(unordered_multimap<>::_M_invalidate): Adapt.
	* include/debug/unordered_set (unordered_set<>::_M_invalidate): Adapt.
	(unordered_multiset<>::_M_invalidate): Adapt.

2020-07-29  David Edelsohn  <dje.gcc@gmail.com>
	    Jonathan Wakely  <jwakely@redhat.com>
	    Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* testsuite/lib/dg-options.exp (add_options_for_libatomic): Add
	target powerpc-ibm-aix* and powerpc*-*-darwin*.
	* testsuite/29_atomics/atomic_float/value_init.cc: Add options
	for libatomic.

2020-07-29  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable.h
	(_Hashtable(_Hashtable&& __ht, __node_alloc_type&& __a, true_type)):
	Add noexcept qualification.
	(_Hashtable(_Hashtable&&)): Fix noexcept qualification.
	(_Hashtable(_Hashtable&&, const allocator_type&)): Add noexcept
	qualification.
	* include/bits/unordered_map.h
	(unordered_map(unordered_map&&, const allocator_type&)): Add noexcept
	qualification.
	(unordered_multimap(unordered_multimap&&, const allocator_type&)):
	Likewise.
	* include/bits/unordered_set.h
	(unordered_set(unordered_set&&, const allocator_type&)): Likewise.
	(unordered_multiset(unordered_multiset&&, const allocator_type&)):
	Likewise.
	* include/debug/unordered_map
	(unordered_map(unordered_map&&, const allocator_type&)): Likewise.
	(unordered_multimap(unordered_multimap&&, const allocator_type&)):
	Likewise.
	* include/debug/unordered_set
	(unordered_set(unordered_set&&, const allocator_type&)): Likewise.
	(unordered_multiset(unordered_multiset&&, const allocator_type&)):
	Likewise.
	* testsuite/23_containers/unordered_map/allocator/default_init.cc:
	New test.
	* testsuite/23_containers/unordered_map/cons/noexcept_default_construct.cc:
	New test.
	* testsuite/23_containers/unordered_map/cons/noexcept_move_construct.cc:
	New test.
	* testsuite/23_containers/unordered_map/modifiers/move_assign.cc:
	New test.
	* testsuite/23_containers/unordered_multimap/cons/noexcept_default_construct.cc:
	New test.
	* testsuite/23_containers/unordered_multimap/cons/noexcept_move_construct.cc:
	New test.
	* testsuite/23_containers/unordered_multiset/cons/noexcept_default_construct.cc:
	New test.
	* testsuite/23_containers/unordered_multiset/cons/noexcept_move_construct.cc:
	New test.
	* testsuite/23_containers/unordered_set/allocator/default_init.cc:
	New test.
	* testsuite/23_containers/unordered_set/cons/noexcept_default_construct.cc:
	New test.
	* testsuite/23_containers/unordered_set/cons/noexcept_move_construct.cc:
	New test.

2020-07-28  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable.h
	(_Hashtable<>(_InputIterator, _InputIterator, size_t, const _H1&,
	const _H2&, const _Hash&, const _Equal&, const _ExtractKey&,
	const allocator_type&, true_type)): New.
	(_Hashtable<>(_InputIterator, _InputIterator, size_t, const _H1&,
	const _H2&, const _Hash&, const _Equal&, const _ExtractKey&,
	const allocator_type&, false_type)): New.
	(_Hashtable<>(_InputIterator, _InputIterator, size_t, const _H1&,
	const _H2&, const _Hash&, const _Equal&, const _ExtractKey&,
	const allocator_type&)): Delegate to latters.
	(operator=(initializer_list<value_type>)): Rehash if too small.
	(_M_insert(_Arg&&, const _NodeGenerator&, true_type)): Remove
	size_t len parameter.
	* include/bits/hashtable_policy.h (_Insert_base<>::_M_insert_range):
	Do not try to get input range distance.
	* testsuite/23_containers/unordered_set/cons/bucket_hint.cc: New test.
	* testsuite/23_containers/unordered_set/modifiers/insert.cc: New test.

2020-07-27  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable_policy.h (_Map_base<>::at): Use
	_Hashtable<>::find.
	(_Hashtable_base<>::_Equal_hash_code<>::_S_node_equals):New.
	(_Hashtable_base<>::_M_node_equals): New, use latter.
	(_Equality<_Key, _Value, _Alloc, _ExtractKey, _Equal, _H1, _H2, _Hash,
	_RehashPolicy, false>::_M_equal): Adapt to use latter.
	* include/bits/hashtable.h (_Hashtable<>::_M_update_bbegin): New.
	(_Hashtable<>::_M_assign): Use latter.
	(_Hashtable<>::_M_move_assign): Likewise.
	(_Hashtable<>(_Hashtable<>&&)): Likewise.
	(_Hashtable<>(_Hashtable<>&&, const allocator_type&)): Likewise.
	(_Hashtable<>::swap): Likewise.
	(_Hashtable<>::find): Build iterator directly from _M_find_node result.
	(_Hashtable<>::count): Use _Hashtable<>::find.
	(_Hashtable<>::equal_range): Likewise.
	(_Hashtable<>::_M_erase(false_type, const key_type&)): Use
	_M_node_equals.

2020-07-27  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/floating_from_chars.cc (from_chars_impl): Ensure
	that FE_NEAREST is used.
	* testsuite/20_util/from_chars/4.cc: Do not use if constexpr in
	a { target c++14 } test.
	[!_GLIBCXX_HAVE_USELOCALE]: Disable all tests.
	* testsuite/20_util/from_chars/5.cc [!_GLIBCXX_HAVE_USELOCALE]:
	Likewise.
	* testsuite/20_util/from_chars/6.cc: New test.

2020-07-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/future (future, shared_future, promise): Add
	static assertions to the primary template to reject array and
	function types.
	* testsuite/30_threads/future/requirements/lwg3458.cc: New test.
	* testsuite/30_threads/promise/requirements/lwg3466.cc: New test.
	* testsuite/30_threads/shared_future/requirements/lwg3458.cc: New test.

2020-07-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (reverse_iterator): Constrain
	converting constructor and converting assignment operator.
	Access source iterator's data member directly instead of
	calling base().
	(move_iterator): Likewise.
	* testsuite/24_iterators/move_iterator/dr3435.cc: New test.
	* testsuite/24_iterators/reverse_iterator/dr3435.cc: New test.

2020-07-20  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (libtool_VERSION): Bump version.
	* config.h.in: Regenerate.
	* config/abi/pre/gnu.ver: Add GLIBCXX_3.4.29 version and new
	exports.
	* config/os/gnu-linux/ldbl-extra.ver: Add _GLIBCXX_LDBL_3.4.29
	version and new export.
	* configure: Regenerate.
	* configure.ac: Check for <xlocale.h> and uselocale.
	* crossconfig.m4: Add macro or checks for uselocale.
	* include/std/charconv (from_chars): Declare overloads for
	float, double, and long double.
	* src/c++17/Makefile.am: Add new file.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/floating_from_chars.cc: New file.
	(from_chars): Define for float, double, and long double.
	* testsuite/20_util/from_chars/1_c++20_neg.cc: Prune extra
	diagnostics caused by new overloads.
	* testsuite/20_util/from_chars/1_neg.cc: Likewise.
	* testsuite/20_util/from_chars/2.cc: Check leading '+'.
	* testsuite/20_util/from_chars/4.cc: New test.
	* testsuite/20_util/from_chars/5.cc: New test.
	* testsuite/util/testsuite_abi.cc: Add new symbol versions.

2020-07-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/istream.tcc
	(basic_istream::get(__streambuf_type&, char_type): Use unsigned
	long long for counter and check if it would overflow _M_gcount.
	* testsuite/27_io/basic_istream/get/char/lwg3464.cc: New test.
	* testsuite/27_io/basic_istream/get/wchar_t/lwg3464.cc: New test.

2020-07-17  Iain Sandoe  <iain@sandoe.co.uk>

	* include/std/coroutine: Mark the methods of the
	trivial awaitables as constexpr.

2020-07-14  David Edelsohn  <dje.gcc@gmail.com>

	* config/os/aix/t-aix: Set BITS from compiler cpp macro.

2020-07-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94749
	PR libstdc++/96161
	* include/bits/istream.tcc (basic_istream::ignore(streamsize))
	[n == max]: Check overflow conditions on _M_gcount. Rely on
	the fact that either EOF or the delimiter was reached.
	[n < max]: Check _M_gcount < n before checking for EOF or
	delimiter.
	(basic_istream::ignore(streamsize, char_type): Likewise.
	* src/c++98/compatibility.cc (istream::ignore(streamsize))
	(wistream::ignore(streamsize)): Likewise.
	* src/c++98/istream.cc (istream::ignore(streamsize, char_type))
	(wistream::ignore(streamsize, char_type)): Likewise.
	* testsuite/27_io/basic_istream/ignore/char/94749.cc: Check that
	delimiter is discarded if the number of characters ignored
	doesn't fit in streamsize.
	* testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc:
	Likewise.
	* testsuite/27_io/basic_istream/ignore/char/96161.cc: New test.
	* testsuite/27_io/basic_istream/ignore/wchar_t/96161.cc: New test.

2020-07-08  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_tree.h (_Rb_tree_impl(_Rb_tree_impl&&)): Add noexcept
	qualification based only on _Compare one.
	* testsuite/23_containers/map/cons/noexcept_move_construct.cc: Add
	static asserts.
	* testsuite/23_containers/multimap/cons/noexcept_move_construct.cc:
	Likewise.
	* testsuite/23_containers/multiset/cons/noexcept_move_construct.cc:
	Likewise.
	* testsuite/23_containers/set/cons/noexcept_move_construct.cc: Likewise.

2020-07-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/limits: Whitespace changes.

2020-07-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/Makefile.am: Remove bits/int_limits.h.
	* include/Makefile.in: Regenerate.
	* include/bits/int_limits.h: Removed.
	* include/bits/parse_numbers.h (_Select_int_base): Replace
	__int_limits with __int_traits.
	* include/bits/range_access.h (_SSize::operator()): Likewise.
	* include/ext/numeric_traits.h (__numeric_traits_integer): Add
	static assertion.
	(__int_traits): New alias template.
	* include/std/bit (__rotl, __rotr, __countl_zero, __countl_one)
	(__countr_zero, __countr_one, __popcount, __bit_ceil)
	(__bit_floor, __bit_width) Replace __int_limits with
	__int_traits.
	* include/std/charconv (__to_chars_8, __from_chars_binary)
	(__from_chars_alpha_to_num, from_chars): Likewise.
	* include/std/memory_resource (polymorphic_allocator::allocate)
	(polymorphic_allocator::allocate_object): Likewise.
	* include/std/string_view (basic_string_view::_S_compare):
	Likewise.
	* include/std/utility (cmp_equal, cmp_less, in_range): Likewise.

2020-07-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/limits: Whitespace changes.

2020-07-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/optional (_Optional_payload_base, _Optional_base)
	(optional, __optional_hash_call_base): Adjust whitespace and
	other formatting. Remove redundant && tokens on template
	arguments to type traits.

2020-07-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/optional (make_optional): Add enable_if
	constraints and noexcept-specifier to each overload.
	* testsuite/20_util/optional/make_optional-2.cc: New test.

2020-07-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96036
	* include/std/optional (optional): Add noexcept-specifier to
	every constructor, assignment operator, emplace function and
	dereference operator.
	* testsuite/20_util/optional/assignment/noexcept.cc: New test.
	* testsuite/20_util/optional/cons/noexcept.cc: New test.

2020-07-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96063
	* include/bits/fs_dir.h: Use consistent tag in class-head.
	* include/bits/localefwd.h: Likewise.
	* include/bits/regex.h: Likewise.
	* include/bits/stl_map.h: Likewise.
	* include/bits/stl_multimap.h: Likewise.
	* include/bits/stl_multiset.h: Likewise.
	* include/bits/stl_set.h: Likewise.
	* include/std/complex: Likewise.
	* include/std/functional: Likewise.
	* include/std/future: Likewise.
	* include/std/system_error: Likewise.
	* include/std/thread: Likewise.
	* include/std/tuple: Likewise.
	* include/std/type_traits: Likewise.
	* include/std/valarray: Likewise.

2020-07-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_ios/conv/voidptr.cc: Add c++98_only
	target selector.

2020-07-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/headers/cstdalign/std_c++0x_neg.cc: Add
	c++98_only target selector.
	* testsuite/18_support/headers/cstdbool/std_c++0x_neg.cc:
	Likewise.
	* testsuite/18_support/headers/cstdint/std_c++0x_neg.cc:
	Likewise.
	* testsuite/18_support/headers/new/synopsis_cxx98.cc: Likewise.
	* testsuite/19_diagnostics/headers/system_error/std_c++0x_neg.cc:
	Likewise.
	* testsuite/20_util/headers/type_traits/std_c++0x_neg.cc:
	Likewise.
	* testsuite/23_containers/headers/array/std_c++0x_neg.cc:
	Likewise.
	* testsuite/23_containers/headers/tuple/std_c++0x_neg.cc:
	Likewise.
	* testsuite/23_containers/headers/unordered_map/std_c++0x_neg.cc:
	Likewise.
	* testsuite/23_containers/headers/unordered_set/std_c++0x_neg.cc:
	Likewise.
	* testsuite/26_numerics/headers/ccomplex/std_c++0x_neg.cc:
	Likewise.
	* testsuite/26_numerics/headers/cfenv/std_c++0x_neg.cc:
	Likewise.
	* testsuite/26_numerics/headers/cmath/c99_classification_macros_c++98.cc:
	Likewise.
	* testsuite/26_numerics/headers/ctgmath/std_c++0x_neg.cc:
	Likewise.
	* testsuite/26_numerics/headers/random/std_c++0x_neg.cc:
	Likewise.
	* testsuite/27_io/headers/cinttypes/std_c++0x_neg.cc: Likewise.
	* testsuite/28_regex/headers/regex/std_c++0x_neg.cc: Likewise.
	* testsuite/29_atomics/headers/atomic/std_c++0x_neg.cc:
	Likewise.
	* testsuite/30_threads/headers/condition_variable/std_c++0x_neg.cc:
	Likewise.
	* testsuite/30_threads/headers/future/std_c++0x_neg.cc:
	Likewise.
	* testsuite/30_threads/headers/mutex/std_c++0x_neg.cc: Likewise.
	* testsuite/30_threads/headers/thread/std_c++0x_neg.cc:
	Likewise.

2020-07-02  Ville Voutilainen  <ville.voutilainen@gmail.com>

	PR libstdc++/91807
	* include/std/variant
	(_Copy_assign_base::operator=(const _Copy_assign_base&):
	Do the move-assignment from a temporary so that the temporary
	is constructed with an explicit index.
	* testsuite/20_util/variant/91807.cc: New.

2020-07-02  Jonathan Wakely  <jwakely.gcc@gmail.com>

	PR libstdc++/91153
	PR target/93224
	* testsuite/29_atomics/atomic_float/1.cc: Use different values
	for tests.
	* testsuite/29_atomics/atomic_ref/float.cc: Likewise.

2020-07-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94627
	* include/bits/regex.h (operator==, operator!=): Remove noexcept
	equality comparisons for match_results.
	* testsuite/28_regex/match_results/94627.cc: New test.

2020-07-01  Martin Sebor  <msebor@redhat.com>

	* testsuite/21_strings/basic_string_view/cons/char/nonnull.cc: Adjust
	text of expected warning.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/nonnull.cc: Same.
	* testsuite/21_strings/basic_string_view/operations/compare/char/nonnull.cc: Same.
	* testsuite/21_strings/basic_string_view/operations/find/char/nonnull.cc: Same.
	* testsuite/21_strings/basic_string_view/operations/rfind/char/nonnull.cc: Same.

2020-06-29  Ville Voutilainen  <ville.voutilainen@gmail.com>

	Revert:
	2020-06-28  Ville Voutilainen  <ville.voutilainen@gmail.com>

	* include/bits/basic_string.h (string(_CharT*, const _Alloc&)):
	Add a __nonnull__ attribute.
	* testsuite/21_strings/basic_string/cons/char/nonnull.cc: New.
	* testsuite/21_strings/basic_string/cons/wchar_t/nonnull.cc: Likewise.

2020-06-28  Ville Voutilainen  <ville.voutilainen@gmail.com>

	* include/bits/basic_string.h (string(_CharT*, const _Alloc&)):
	Add a __nonnull__ attribute.
	* testsuite/21_strings/basic_string/cons/char/nonnull.cc: New.
	* testsuite/21_strings/basic_string/cons/wchar_t/nonnull.cc: Likewise.

2020-06-28  Ville Voutilainen  <ville.voutilainen@gmail.com>

	PR libstdc++/95915
	* include/std/type_traits (is_literal_type, is_literal_type_v):
	Deprecate in C++17.
	* include/std/variant (_Uninitialized):
	Adjust the condition and the comment.
	* testsuite/20_util/is_literal_type/deprecated-1z.cc: New.
	* testsuite/20_util/is_literal_type/requirements/explicit_instantiation.cc:
	Adjust.
	* testsuite/20_util/is_literal_type/requirements/typedefs.cc: Likewise.
	* testsuite/20_util/is_literal_type/value.cc: Likewise.
	* testsuite/20_util/optional/constexpr/nullopt.cc:
	Use __is_literal_type directly.
	* testsuite/20_util/optional/nullopt.cc: Likewise.
	* testsuite/20_util/variable_templates_for_traits.cc: Adjust.
	* testsuite/20_util/variant/95915.cc: New.
	* testsuite/20_util/variant/compile.cc: Add new test.
	* testsuite/experimental/optional/constexpr/nullopt.cc:
	Use __is_literal_type directly.
	* testsuite/experimental/optional/nullopt.cc: Likewise.
	* testsuite/experimental/type_traits/value.cc: Adjust.
	* testsuite/util/testsuite_common_types.h:
	Use __is_literal_type directly.

2020-06-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/charconv (__from_chars_binary): Ignore leading zeros.
	* testsuite/20_util/from_chars/1.cc: Check "0x1" for all bases,
	not just 10 and 16.
	* testsuite/20_util/from_chars/3.cc: New test.

2020-06-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_algobase.h (__find_if): Add FALLTHRU markers.
	* include/std/charconv (__detail::__to_chars): Avoid
	-Wsign-compare warning.

2020-06-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95851
	* include/std/charconv (__to_chars_i): Check for zero-sized
	buffer unconditionally.
	* testsuite/20_util/to_chars/95851.cc: New test.

2020-06-23  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/from_chars/1_c++20_neg.cc: Check enumeration
	type.
	* testsuite/20_util/from_chars/1_neg.cc: Likewise. Move dg-error
	directives outside preprocessor condition.

2020-06-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95832
	* include/std/variant (__detail::__variant::_Build_FUN): Remove
	partial specialization to prevent narrowing conversions to bool.
	* testsuite/20_util/variant/compile.cc: Test non-narrowing
	conversions to bool.
	* testsuite/20_util/variant/run.cc: Likewise.

2020-06-23  Jonathan Wakely  <jwakely@redhat.com>

	* doc/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

2020-06-22  David Edelsohn  <dje.gcc@gmail.com>

	* Makefile.am: Use -include.
	* Makefile.in: Regenerate.

2020-06-21  David Edelsohn  <dje.gcc@gmail.com>

	* Makefile.am (tmake_file): Build and install AIX-style FAT libraries.
	* Makefile.in: Regenerate.
	* configure.ac (tmake_file): Substitute.
	* configure: Regenerate.
	* configure.host (aix*): Define tmake_file.
	* config/os/aix/t-aix: New file.

2020-06-20  Jason Merrill  <jason@redhat.com>

	* testsuite/24_iterators/move_iterator/rel_ops_c++20.cc:
	Remove greedy_ops tests.
	* testsuite/24_iterators/reverse_iterator/rel_ops_c++20.cc:
	Remove greedy_ops tests.

2020-06-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95765
	* include/bits/stl_algobase.h (__size_to_integer(float))
	(__size_to_integer(double), __size_to_integer(long double))
	(__size_to_integer(__float128)): Cast return type explicitly.
	* include/bits/stl_uninitialized.h (__uninitialized_default_1<true>):
	Remove unused typedef.

2020-06-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_pair.h (_Index_tuple): Remove redundant
	namespace qualification.
	(pair::pair(tuple<>&, tuple<>&, _Index_tuple, _Index_tuple)):
	Likewise.
	* include/std/tuple (_Head_base, _Tuple_impl, tuple_size)
	(tuple_element, __get_helper, get, __make_tuple_impl)
	(__make_1st_indices, __tuple_concater)
	(pair::pair(tuple<>&, tuple<>&, _Index_tuple, _Index_tuple)):
	Likewise.
	* include/std/utility (tuple_element, __is_tuple_like_impl)
	(tuple_size, __pair_get, get): Likewise.

2020-06-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_function.h (function): Define all member
	functions inline.

2020-06-19  Marc Glisse  <marc.glisse@inria.fr>

	* include/bits/stl_algo.h (__includes): Simplify the code.

2020-06-19  Marc Glisse  <marc.glisse@inria.fr>

	* include/std/optional (optional()): Explicitly define it.

2020-06-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94540
	* include/bits/stl_uninitialized.h (__uninitialized_default_1<true>):
	Construct the first value at *__first instead of on the stack.
	(__uninitialized_default_n_1<true>): Likewise.
	Improve comments on several of the non-standard algorithms.
	* testsuite/20_util/specialized_algorithms/uninitialized_default/94540.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_default_n/94540.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct/94540.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct_n/94540.cc:
	New test.
	* testsuite/23_containers/vector/cons/94540.cc: New test.

2020-06-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/specialized_algorithms/uninitialized_default_n/sizes.cc:
	Replace Value type with int so trivial code path is used.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct_n/sizes.cc:
	Likewise.

2020-06-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_uninitialized.h (uninitialized_fill_n): Only
	use std::fill_n when the size is an integral type.
	(__uninitialized_default_n): Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_default_n/sizes.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_fill_n/sizes.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct_n/sizes.cc:
	New test.

2020-06-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95282
	* include/bits/atomic_base.h (__atomic_impl::load): Use the _Val
	alias instead of deducing _Tp as an unqualified type.
	(__atomic_impl::exchange): Use the _Val alias to remove volatile
	from the reinterpret_cast result type.

2020-06-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/atomic (atomic): Add static assertions.
	* testsuite/29_atomics/atomic/requirements/types_neg.cc: New test.

2020-06-16  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/94003
	* testsuite/20_util/is_constructible/94003.cc: New test.

2020-06-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/char_traits.h (__cpp_lib_constexpr_char_traits):
	Update value for C++20.
	* include/std/version (__cpp_lib_constexpr_char_traits): Likewise.
	* testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc:
	Update expected value.
	* testsuite/21_strings/char_traits/requirements/constexpr_functions_c++20.cc:
	Likewise.

2020-06-15  Paul Keir  <paul.keir@uws.ac.uk>

	* include/bits/char_traits.h (char_traits::move): constexpr move with
	overlap was using copy_backward incorrectly.
	* testsuite/21_strings/char_traits/requirements/constexpr_functions_c++20.cc:
	New test.

2020-06-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/29_atomics/atomic_flag/clear/1.cc: Also test clear()
	when the value is currently set.
	* testsuite/29_atomics/atomic_flag/test_and_set/explicit.cc:
	Actually check the return value.
	* testsuite/29_atomics/atomic_flag/test_and_set/implicit.cc:
	Likewise.

2020-06-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_base.h (atomic_flag::test): Add missing
	const qualifiers.
	* testsuite/29_atomics/atomic_flag/test/explicit.cc: Add
	dg-options and verify results of test function.
	* testsuite/29_atomics/atomic_flag/test/implicit.cc: Likewise.

2020-06-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94749
	* include/bits/istream.tcc (basic_istream::ignore(streamsize, CharT)):
	Only discard an extra character if we didn't already reach the
	maximum number.
	* src/c++98/istream.cc (istream::ignore(streamsiz, char))
	(wistream::ignore(streamsize, wchar_t)): Likewise.
	* testsuite/27_io/basic_istream/ignore/char/94749.cc: New test.
	* testsuite/27_io/basic_istream/ignore/wchar_t/94749.cc: New test.

2020-06-10  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/95578
	* include/bits/ranges_algo.h (__lexicographical_compare_fn):
	Also check that the iterator and sentinel have the same type before
	applying the unwrapping optimization for __normal_iterator.
	Split the check into two, one for the first iterator/sentinel
	pair and another for second iterator/sentinel pair.  Remove uses
	of __niter_base, and remove uses of std::move on a
	__normal_iterator.
	* include/bits/ranges_algobase.h (__equal_fn): Likewise.
	(__copy_or_move): Likewise.  Perform similar adjustments for
	the reverse_iterator and move_iterator optimizations.  Inline
	the checks into the if-constexprs, and use using-declarations to
	make them less visually noisy.  Remove uses of __niter_wrap.
	(__copy_or_move_backward): Likewise.
	* testsuite/25_algorithms/copy/95578.cc: New test.
	* testsuite/25_algorithms/copy_backward/95578.cc: New test.
	* testsuite/25_algorithms/equal/95578.cc: New test.
	* testsuite/25_algorithms/lexicographical_compare/95578.cc: New test.
	* testsuite/25_algorithms/move/95578.cc: New test.
	* testsuite/25_algorithms/move_backward/95578.cc: New test.

2020-06-10  François Dumont  <fdumont@gcc.gnu.org>
	    Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/deque.tcc (__lex_cmp_dit): New.
	(__lexicographical_compare_aux1): Define overloads for deque
	iterators.
	* include/bits/stl_algobase.h (__lexicographical_compare::__3way):
	New static member function.
	(__lexicographical_compare<true>::__3way): Likewise.
	(__lexicographical_compare<true>::__lc): Use __3way.
	(__lexicographical_compare_aux): Rename to
	__lexicographical_compare_aux1 and declare overloads for deque
	iterators.
	(__lexicographical_compare_aux): Define new forwarding function
	that calls __lexicographical_compare_aux1 and declare new overloads
	for safe iterators.
	(lexicographical_compare): Do not use __niter_base on
	parameters.
	* include/debug/safe_iterator.tcc
	(__lexicographical_compare_aux): Define overloads for safe
	iterators.
	* testsuite/25_algorithms/lexicographical_compare/1.cc: Add
	checks with random access iterators.
	* testsuite/25_algorithms/lexicographical_compare/deque_iterators/1.cc:
	New test.

2020-06-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (move_iterator::operator=): Define.
	* testsuite/24_iterators/move_iterator/dr3265.cc: New test.

2020-06-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/optional (bad_optional_access): Define default
	constructor and destructor as defaulted.
	* testsuite/20_util/optional/bad_access.cc: New test.

2020-06-08  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error
	line number.
	* testsuite/20_util/default_delete/void_neg.cc: Likewise.

2020-06-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/unique_ptr.h (operator<<): Define for C++20.
	* testsuite/20_util/unique_ptr/io/lwg2948.cc: New test.

2020-06-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (__detail::__ptr, __detail::__ref)
	(__detail::__cat, __detail::__diff): Move to class scope in the
	relevant __iterator_traits specializations.
	(__iterator_traits<>): Use nested class templates instead of ones from
	namespace __detail.
	* include/bits/stl_iterator.h (__detail::__common_iter_ptr): Move to
	class scope in iterator_traits<common_iterator<I, S>>.
	(iterator_traits<common_iterator<I, S>>): Use nested class template
	instead of __detail::__common_iter_ptr.

2020-06-04  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_algo.h (__copy_n_a): Move to ...
	* include/bits/stl_algobase.h (__copy_n_a): ...here. Add __strict
	parameter.
	(__copy_n_a(istreambuf_iterator<>, _Size, _Deque_iterator<>, bool)):
	Declare.
	(__niter_base(const _Safe_iterator<_Ite, _Seq,
	random_access_iterator_tag>&)): Declare.
	(__copy_move_a2(istreambuf_iterator<>, istreambuf_iterator<>,
	_Deque_iterator<>)): Declare.
	* include/bits/deque.tcc
	(__copy_move_a2(istreambuf_iterator<>, istreambuf_iterator<>,
	_Deque_iterator<>)): New.
	(__copy_n_a(istreambuf_iterator<>, _Size, _Deque_iterator<>, bool)):
	New.
	* include/bits/streambuf_iterator.h
	(__copy_n_a(istreambuf_iterator<>, _Size, _CharT*, bool)): Adapt.
	* include/debug/safe_iterator.tcc (__niter_base): New.
	* testsuite/25_algorithms/copy/streambuf_iterators/char/4.cc
	(test03): New.
	* testsuite/25_algorithms/copy/streambuf_iterators/char/debug/deque_neg.cc:
	New test.
	* testsuite/25_algorithms/copy_n/debug/istreambuf_ite_deque_neg.cc:
	New test.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/2.cc: New test.
	* testsuite/25_algorithms/copy_n/istreambuf_iterator/deque.cc:
	New test.

2020-06-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_algobase.h (__copy_n_fn): Only call
	ranges::copy for positive values.
	* include/bits/stl_algo.h (copy_n): Convert Size argument to an
	integral type and only call __copy_n for positive values.
	* testsuite/util/testsuite_iterators.h
	(random_access_iterator_wrapper::operator+=): Fix range check for
	negative values.
	(output_container, input_container, forward_container)
	(bidirectional_container, random_access_container): New alias
	templates.
	* testsuite/25_algorithms/copy_n/5.cc: New test.

2020-06-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90102
	* include/debug/deque (deque(const _Base&)): Replace parameter
	with a struct that wraps a const _Base&.
	* include/debug/forward_list (forward_list(_Base_ref)): New
	constructor.
	* include/debug/list (list(const _Base&)): Replace parameter
	with a struct that wraps a const _Base&.
	* include/debug/map.h (map(const _Base&)): Likewise.
	* include/debug/multimap.h (multimap(const _Base&)): Likewise.
	* include/debug/multiset.h (multiset(const _Base&)): Likewise.
	* include/debug/set.h (set(const _Base&)): Likewise.
	* include/debug/unordered_map (unordered_map(const _Base&))
	(unordered_multimap(const _Base&)): Likewise.
	* include/debug/unordered_set (unordered_set(const _Base&))
	(unordered_multiset(const _Base&)): Likewise.
	* testsuite/23_containers/vector/cons/destructible_debug_neg.cc:
	Adjust dg-error line number.
	* include/debug/vector (vector(const _Base&)): Likewise.
	* testsuite/23_containers/deque/debug/90102.cc: New test.
	* testsuite/23_containers/forward_list/debug/90102.cc: New test.
	* testsuite/23_containers/list/debug/90102.cc: New test.
	* testsuite/23_containers/map/debug/90102.cc: New test.
	* testsuite/23_containers/multimap/debug/90102.cc: New test.
	* testsuite/23_containers/multiset/debug/90102.cc: New test.
	* testsuite/23_containers/set/debug/90102.cc: New test.
	* testsuite/23_containers/unordered_map/debug/90102.cc: New test.
	* testsuite/23_containers/unordered_multimap/debug/90102.cc: New test.
	* testsuite/23_containers/unordered_multiset/debug/90102.cc: New test.
	* testsuite/23_containers/unordered_set/debug/90102.cc: New test.
	* testsuite/23_containers/vector/debug/90102.cc: New test.

2020-06-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95392
	* include/bits/fs_path.h (path::_S_to_string): Move to
	namespace-scope and rename to ...
	(__detail::__string_from_range): ... this.
	[WINDOWS] (__detail::__wstr_from_utf8): New function template to
	convert a char sequence containing UTF-8 to wstring.
	(path::_S_convert(Iter, Iter)): Adjust call to _S_to_string.
	(path::_S_convert_loc(Iter, Iter, const locale&)): Likewise.
	(u8path(InputIterator, InputIterator)) [WINDOWS]: Use
	__string_from_range to obtain a contiguous range and
	__wstr_from_utf8 to obtain a wide string.
	(u8path(const Source&)) [WINDOWS]: Use __effective_range to
	obtain a contiguous range and __wstr_from_utf8 to obtain a wide
	string.
	(path::_S_convert(const _EcharT*, const _EcharT)) [WINDOWS]:
	Use __wstr_from_utf8.

2020-06-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_iterators.h:
	(input_iterator_wrapper::operator++(int)): Return proxy object.

2020-06-01  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/evolution.xml: Document deprecation of
	__is_nullptr_t and removal of std::allocator members.
	* doc/html/manual/api.html: Regenerate.

2020-06-01  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/containers.xml: Replace <xref> with <link>.
	* doc/xml/manual/evolution.xml: Likewise.
	* doc/html/manual/api.html: Regenerate.
	* doc/html/manual/containers.html: Regenerate.

2020-06-01  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/faq.xml: Adjust Valgrind reference and remove another.
	* doc/html/faq.html: Regenerate.

2020-06-01  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/policy_data_structures_biblio.xml: Remove
	stray change.

2020-06-01  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/policy_data_structures_biblio.xml: Switch
	www.cs.princeton.edu to https.
	* doc/html/manual/policy_data_structures.html: Regenerate.

2020-05-31  Douglas B Rupp  <douglas.b.rupp@gmail.com>

	* crossconfig.m4 (<*-vxworks>): Check for more math decls.
	* configure: Rebuild.

2020-05-29  H.J. Lu  <hjl.tools@gmail.com>

	PR bootstrap/95413
	* configure: Regenerated.

2020-05-29  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/95079
	* include/bits/hashtable_policy.h (_Insert_base<>::try_emplace): New.
	* include/bits/unordered_map.h (unordered_map<>::try_emplace): Adapt.
	(unordered_map<>::insert_or_assign): Adapt.

2020-05-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95282
	* include/bits/atomic_base.h (__atomic_impl::load): Add
	cv-qualifiers to parameter so that _Tp is deduced as the
	unqualified type.
	* testsuite/29_atomics/atomic_float/95282.cc: New test.

2020-05-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95322
	* include/std/ranges (transform_view::_Sentinel): Allow hidden
	friends to work with _Iterator<true> and _Iterator<false>.
	(join_view::_Sentinel): Likewise.
	* testsuite/std/ranges/adaptors/95322.cc: New test.

2020-05-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94354
	* include/bits/stl_iterator.h (reverse_iterator): Fix comparison
	operators to use the correct operations on the underlying
	iterators.
	* testsuite/24_iterators/reverse_iterator/rel_ops.cc: New test.

2020-05-27  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/comparisons/categories/zero_neg.cc: New test.

2020-05-26  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/95322
	* include/bits/stl_iterator.h (__detail::_Common_iter_proxy):
	Remove and instead define it ...
	(common_iterator::_Proxy): ... here.
	(common_iterator::operator->): Use it.
	* testsuite/24_iterators/common_iterator/2.cc: New test.
	* testsuite/std/ranges/adaptors/95322.cc: New test.

2020-05-23  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/93978
	* testsuite/std/ranges/adaptors/93978.cc: Add -Wall to
	dg-additional-options.  Avoid unused-but-set-variable warning.

2020-05-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95289
	* include/debug/helper_functions.h (__get_distance): Only declare
	as a constexpr function for C++14 and up.
	* testsuite/25_algorithms/copy/debug/95289.cc: New test.

	* include/bits/fs_path.h (__detail::_S_range_begin)
	(__detail::_S_range_end, path::_S_string_from_iter): Replace with
	overloaded function template __detail::__effective_range.
	(__detail::__effective_range): New overloaded function template to
	create a basic_string or basic_string_view for an effective range.
	(__detail::__value_type_is_char): Use __detail::__effective_range.
	Do not use remove_const on value type.
	(__detail::__value_type_is_char_or_char8_t): Likewise.
	(path::path(const Source&, format))
	(path::path(const Source&, const locale&))
	(path::operator/=(const Source&), path::append(const Source&))
	(path::concat(const Source&)): Use __detail::__effective_range.
	(path::_S_to_string(InputIterator, InputIterator)): New function
	template to create a string view if possible, or string otherwise.
	(path::_S_convert): Add overloads that convert a string returned
	by __detail::__effective_range. Use if-constexpr to inline conversion
	logic from all overloads of _Cvt::_S_convert.
	(path::_S_convert_loc): Add overload that converts a string. Use
	_S_to_string to avoid allocation when possible.
	(path::_Cvt): Remove.
	(path::operator+=(CharT)): Remove indirection through path::concat.
	* include/experimental/bits/fs_path.h (path::_S_convert_loc): Add
	overload for non-const pointers, to avoid constructing a std::string.
	* src/c++17/fs_path.cc (path::_S_convert_loc): Replace conditional
	compilation with call to _S_convert.

	* include/bits/fs_path.h (__detail::_S_range_begin)
	(__detail::_S_range_end): Remove unintentional static specifiers.
	* include/experimental/bits/fs_path.h (__detail::_S_range_begin)
	(__detail::_S_range_end): Likewise.

	* include/bits/fs_path.h (filesystem::__detail::__is_encoded_char):
	Replace alias template with variable template. Don't remove const.
	(filesystem::__detail::__is_path_src): Replace overloaded function
	template with variable template and specializations.
	(filesystem::__detail::__is_path_iter_src): Replace alias template
	with class template.
	(filesystem::__detail::_Path): Use __is_path_src. Remove support for
	iterator pairs.
	(filesystem::__detail::_Path2): New alias template for checking
	InputIterator requirements.
	(filesystem::__detail::__constructible_from): Remove.
	(filesystem::path): Replace _Path<Iter, Iter> with _Path2<Iter>.
	* testsuite/27_io/filesystem/path/construct/80762.cc: Check with two
	constructor arguments of void and void* types.

2020-05-21  Matthias Kretz  <kretz@kde.org>

	* testsuite/Makefile.am: Remove dup target_triplet and set tool,
	allowing runtest to work without arguments.
	* testsuite/Makefile.in: Regenerate.

2020-05-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93983
	* include/bits/iterator_concepts.h (__detail::__cpp17_iterator):
	Reorder constraints to avoid recursion when constructors use
	iterator_traits (LWG 3420).
	* testsuite/24_iterators/customization_points/lwg3420.cc: New test.

	* include/experimental/socket (basic_socket::is_open()
	(basic_socket_acceptor::is_open()): Use _GLIBCXX_NODISCARD macro.

	* include/experimental/bits/net.h (__endpoint, __protocol)
	(__acceptable_protocol, __inet_protocol): New concepts.
	(__detail::__is_endpoint): Move trait from <experimental/socket>.
	(__is_protocol, __is_acceptable_protocol, __is_inet_protocol): New
	traits.
	(__endpoint, __protocol, __acceptable_protocol): New variable
	templates.
	* include/experimental/socket (__is_endpoint): Move to net.h header.
	(basic_socket, basic_socket_acceptor): Check requirements.

	* include/experimental/executor (use_future_t::use_future_t()): Fix
	incorrect noexcept-specifier.
	* include/experimental/internet (basic_resolver_results): Adjust
	whitespace.
	* include/experimental/socket (__basic_socket_impl::release): Add
	member function.
	(basic_socket(io_context&, const endpoint_type&)): Fix argument to
	target constructor.
	(basic_socket::release(), basic_socket::release(error_code&)): Add
	missing member functions.
	(basic_socket::is_open()): Add nodiscard attribute.
	(basic_socket::close(error_code&)): Pass argument to base function.
	(basic_socket_acceptor::release())
	(basic_socket_acceptor::release(error_code&)): Add missing member
	functions.
	(basic_socket_acceptor::is_open()): Add nodiscard attribute.
	(basic_socket_streambuf::error()): Add noexcept.
	(basic_socket_iostream::error()): Likewise.
	* testsuite/experimental/net/socket/basic_socket.cc: New test.

	* include/experimental/buffer: Replace typedefs with
	alias-declarations.
	* include/experimental/executor: Likewise.
	* include/experimental/internet: Likewise.
	* include/experimental/socket: Likewise.
	* include/experimental/timer: Likewise.

2020-05-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94087
	* src/c++11/random.cc (__x86_rdseed): Allow fallback function to be
	passed in.
	(__x86_rdseed_rdrand): New function that uses rdseed with rdrand
	fallback.
	(random_device::_M_init): Use __x86_rdseed_rdrand when both
	instructions are available.
	* testsuite/26_numerics/random/random_device/94087.cc: New test.

2020-05-19  Patrick Palka  <ppalka@redhat.com>

	PR c++/66439
	* testsuite/20_util/pair/astuple/get_neg.cc: Prune "type/value
	mismatch" messages.
	* testsuite/20_util/tuple/element_access/get_neg.cc: Likewise.

2020-05-15  H.J. Lu  <hongjiu.lu@intel.com>

	PR bootstrap/95147
	* configure: Regenerated.

2020-05-14  H.J. Lu  <hongjiu.lu@intel.com>

	* configure: Regenerated.

2020-05-13  Alexandre Oliva <oliva@adacore.com>

	PR libstdc++/77691
	* include/experimental/memory_resource
	(__resource_adaptor_imp::do_allocate): Handle max_align_t on
	x86-vxworks as on x86-solaris.
	(__resource_adaptor_imp::do_deallocate): Likewise.
	* testsuite/experimental/memory_resource/new_delete_resource.cc:
	Drop xfail.
	(BAD_MAX_ALIGN_T): Define on x86-vxworks as on x86-solaris.
	(test03): Drop max-align test for char-aligned alloc.

2020-05-08  Ulrich Drepper  <drepper@redhat.com>

	* include/bits/atomic_base.h (atomic_flag): Implement test member
	function.
	* include/std/version: Define __cpp_lib_atomic_flag_test.
	* testsuite/29_atomics/atomic_flag/test/explicit.cc: New file.
	* testsuite/29_atomics/atomic_flag/test/implicit.cc: New file.

2020-05-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94971 (partial)
	* include/bits/ranges_algo.h (ranges::__sample_fn): Qualify
	std::sample using macro to work in parallel mode.
	(__sort_fn): Likewise for std::sort.
	(ranges::__nth_element_fn): Likewise for std::nth_element.
	* include/bits/stl_algobase.h (lexicographical_compare_three_way):
	Likewise for std::__min_cmp.
	* include/parallel/algobase.h (lexicographical_compare_three_way):
	Add to namespace std::__parallel.

	PR c/92472
	* include/parallel/multiway_merge.h (_GuardedIterator::operator*)
	(_GuardedIterator::operator _RAIter, _UnguardedIterator::operator*)
	(_UnguardedIterator::operator _RAIter): Add const qualifier.
	(operator<(_GuardedIterator&, _GuardedIterator&)
	(operator<=(_GuardedIterator&, _GuardedIterator&)
	(operator<(_UnguardedIterator&, _UnguardedIterator&)
	(operator<=(_UnguardedIterator&, _UnguardedIterator&): Change
	parameters to const references.

2020-05-07  Eric Botcazou  <ebotcazou@adacore.com>

	* config/abi/post/sparc64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/sparc64-linux-gnu/32/baseline_symbols.txt: Likewise.

2020-05-06  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_algobase.h (struct _Bit_iterator): New declaration.
	(std::__fill_a1(_Bit_iterator, _Bit_iterator, const bool&)): Likewise.
	* include/bits/stl_bvector.h (__fill_bvector): Move outside
	_GLIBCXX_STD_C namespace.
	(fill(_Bit_iterator, _Bit_iterator, const bool&)): Likewise and rename
	into...
	(__fill_a1): ...this.
	* testsuite/25_algorithms/fill/bvector/1.cc: New.

2020-05-06  H.J. Lu  <hongjiu.lu@intel.com>

	* config/abi/post/x86_64-linux-gnu/x32/baseline_symbols.txt: Updated.

2020-05-06  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* config/abi/post/i386-solaris/baseline_symbols.txt: Regenerate.
	* config/abi/post/i386-solaris/amd64/baseline_symbols.txt:
	Likewise.
	* config/abi/post/sparc-solaris/baseline_symbols.txt: Likewise.
	* config/abi/post/sparc-solaris/sparcv9/baseline_symbols.txt:
	Likewise.

2020-05-06  Martin Liska  <mliska@suse.cz>

	Revert:
	2020-05-05  Martin Liska  <mliska@suse.cz>
	PR c/92472
	* include/parallel/multiway_merge.h:
	Use const for _Compare template argument.

2020-05-06  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/abi.xml (abi.versioning.history): Document library
	versions for GCC 9.[123] and 10.1 releases.
	* doc/html/*: Regenerate.

2020-05-06  Jakub Jelinek  <jakub@redhat.com>

	* config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/x86_64-linux-gnu/32/baseline_symbols.txt: Update.
	* config/abi/post/i386-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/i486-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.

2020-05-05  Martin Liska  <mliska@suse.cz>

	PR c/92472
	* include/parallel/multiway_merge.h:
	Use const for _Compare template argument.

2020-05-04  Fangrui Song  <maskray@google.com>

	* libsupc++/cxxabi.h (__cxa_finalize): Fix return type.

2020-05-04  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/faq.xml: Use working link for SGI STL FAQ.
	* doc/html/*: Regenerate.

	PR libstdc++/94906
	* src/c++17/memory_resource.cc
	(monotonic_buffer_resource::_Chunk::release): Use size_t for shift
	operands.

2020-05-04  Nathan Sidwell  <nathan@acm.org>

	PR libstdc++/94747
	* libsupc++/dyncast.cc (__dynamic_cast): Cast offsetof to
	ptrdiff_t before negation, to show intent more clearly.

2020-05-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94936
	* src/c++17/memory_resource.cc (synchronized_pool_resource::_TPools):
	Add comment about single-threaded behaviour.
	(synchronized_pool_resource::_TPools::move_nonempty_chunks()): Hoist
	class member access out of loop.
	(synchronized_pool_resource::synchronized_pool_resource())
	(synchronized_pool_resource::~synchronized_pool_resource())
	(synchronized_pool_resource::release()): Check __gthread_active_p
	before creating and/or deleting the thread-specific data key.
	(synchronized_pool_resource::_M_thread_specific_pools()): Adjust
	assertions.
	(synchronized_pool_resource::do_allocate(size_t, size_t)): Add fast
	path for single-threaded case.
	(synchronized_pool_resource::do_deallocate(void*, size_t, size_t)):
	Likewise. Return if unable to find a pool that owns the allocation.
	* testsuite/20_util/synchronized_pool_resource/allocate_single.cc:
	New test.
	* testsuite/20_util/synchronized_pool_resource/cons_single.cc: New
	test.
	* testsuite/20_util/synchronized_pool_resource/release_single.cc: New
	test.

2020-05-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94933
	* include/bits/stl_algobase.h (__fill_a1): Make overload for byte types
	usable in constant expressions.
	* testsuite/25_algorithms/fill_n/constexpr.cc: Test with bytes and
	non-scalars.

2020-05-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94901
	* testsuite/17_intro/badnames.cc: Test values between _E9 and _E24 too.

2020-05-01  Jonathan Wakely  <jwakely@redhat.com>
	    Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/92894
	* include/bits/iterator_concepts.h (ranges::__cust_imove::_IMove):
	Add trait to determine return type and an alias for it.
	(ranges::__cust_imove::_IMove::operator()): Use __result instead of
	deduced return type.
	(iter_rvalue_reference_t): Use _IMove::__type instead of checking
	the result of ranges::iter_move.
	(__detail::__indirectly_readable_impl): Use iter_rvalue_reference_t
	instead of checking the result of ranges::iter_move.
	* testsuite/24_iterators/customization_points/92894.cc: New test.
	* testsuite/24_iterators/indirect_callable/92894.cc: New test.

2020-05-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94901
	* include/std/type_traits (__is_complete_or_unbounded): Replace
	BADNAME _T with _Tp.
	* testsuite/17_intro/badnames.cc: New test.

2020-04-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89510
	* include/bits/alloc_traits.h (allocator_traits::_S_construct)
	(allocator_traits::_S_destroy)
	(allocator_traits<allocator<T>>::construct): Use traits in
	noexcept-specifiers.
	* include/bits/allocator.h (allocator<void>::construct)
	(allocator<void>::destroy): Likewise.
	* include/ext/malloc_allocator.h (malloc_allocator::construct)
	(malloc_allocator::destroy): Likewise.
	* include/ext/new_allocator.h (new_allocator::construct)
	(new_allocator::destroy): Likewise.
	* testsuite/20_util/allocator/89510.cc: New test.
	* testsuite/ext/malloc_allocator/89510.cc: New test.
	* testsuite/ext/new_allocator/89510.cc: New test.

2020-04-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94854
	* include/bits/basic_string.tcc: Update comment about explicit
	instantiations.

2020-04-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91480
	* include/bits/allocator.h (__cpp_lib_allocator_is_always_equal):
	Remove non-standard macro.
	* include/bits/stl_iterator.h (__cpp_lib_constexpr_iterator): Define
	to indicate P1032R1 support.
	* include/bits/stl_pair.h (__cpp_lib_constexpr_utility): Likewise.
	* include/std/string_view (__cpp_lib_constexpr_string_view): Likewise.
	* include/std/tuple (__cpp_lib_constexpr_tuple): Likewise.
	* include/std/version (__cpp_lib_allocator_is_always_equal): Remove.
	(__cpp_lib_constexpr_iterator, __cpp_lib_constexpr_string_view)
	(__cpp_lib_constexpr_tuple, __cpp_lib_constexpr_utility): Define.
	* testsuite/20_util/function_objects/constexpr_searcher.cc: Check
	feature test macro.
	* testsuite/20_util/tuple/cons/constexpr_allocator_arg_t.cc: Likewise.
	* testsuite/21_strings/basic_string_view/operations/copy/char/
	constexpr.cc: Likewise.
	* testsuite/24_iterators/insert_iterator/constexpr.cc: Likewise.

	PR libstdc++/94831
	* include/bits/alloc_traits.h (_S_construct): Restore placement
	new-expression for C++11/14/17 and call std::construct_at directly
	for C++20.
	* include/bits/stl_construct.h (_Construct): Revert to non-constexpr
	function returning void.
	* testsuite/20_util/specialized_algorithms/
	uninitialized_value_construct/94831.cc: New test.
	* testsuite/23_containers/vector/cons/94831.cc: New test.

2020-04-28  Patrick Palka  <ppalka@redhat.com>

	LWG 3433 subrange::advance(n) has UB when n < 0
	* include/std/ranges (subrange::prev): Fix typo.
	(subrange::advance): Handle a negative argument as per the proposed
	resolution of LWG 3433.
	* testsuite/std/ranges/subrange/lwg3433.cc: New test.

2020-04-28  Jonathan Wakely  <jwakely@redhat.com>
	    Iain Sandoe  <iain@sandoe.co.uk>

	PR c++/94759
	* include/std/coroutine: Implement handing for non-
	class coroutine return types.

2020-04-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/executor (service_already_exists): Make default
	constructor public (LWG 3414).
	* testsuite/experimental/net/execution_context/make_service.cc: Check
	the service_already_exists can be default constructed.

2020-04-24  Kamlesh Kumar  <kamleshbhalui@gmail.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90415
	PR libstdc++/92156
	* include/std/any (any): Rename template parameters for consistency
	with the standard.
	(any::_Decay): Rename to _Decay_if_not_any.
	(any::any(T&&):: Remove is_constructible from constraints. Remove
	non-standard overload.
	(any::any(in_place_type_t<T>, Args&&...))
	(any::any(in_place_type_t<T>, initializer_list<U>, Args&&...))
	(any::emplace(Args&&...))
	(any::emplace(initializer_list<U>, Args&&...)):
	Use decay_t instead of _Decay.
	* testsuite/20_util/any/cons/90415.cc: New test.
	* testsuite/20_util/any/cons/92156.cc: New Test.
	* testsuite/20_util/any/misc/any_cast_neg.cc: Make dg-error directives
	more robust.
	* testsuite/20_util/any/modifiers/92156.cc: New test.

2020-04-23  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update C++20 status table.
	* doc/html/*: Regenerate.

	* include/bits/stl_iterator.h (__cpp_lib_array_constexpr): Revert
	value for C++17 to 201803L because P0858R0 is supported for C++17.
	* include/std/version (__cpp_lib_array_constexpr): Likewise.
	* testsuite/23_containers/array/element_access/constexpr_c++17.cc:
	Check for value corresponding to P0031R0 features being tested.
	* testsuite/23_containers/array/requirements/constexpr_iter.cc:
	Check for value corresponding to P0858R0 features being tested.

	* include/std/version (__cpp_lib_three_way_comparison): Define for
	freestanding builds.

2020-04-23  Thomas Rodgers  <rodgert@appliantology.com>

	* include/experimental/net/executor (system_context): Mark
	system_context::system_context() = delete.
	* testsuite/experimental/net/executor/1.cc: Add new
	test to check system_context is not default constructible.

2020-04-23  Iain Sandoe  <iain@sandoe.co.uk>

	* include/std/coroutine: Update the inline namespace to __n4861.
	Add the __cpp_lib_coroutine define, set to 201902L.
	* include/std/version: Add __cpp_lib_coroutine, set to 201902L.

2020-04-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/execution (__cpp_lib_execution): Define to indicate
	support for P0024R2 and P1001R2.
	* include/std/version (__cpp_lib_execution): Define.
	* testsuite/25_algorithms/pstl/feature_test.cc: Only test macro
	defined by <algorithm>, move other tests to new tests ...
	* testsuite/25_algorithms/pstl/feature_test-2.cc: New test.
	* testsuite/25_algorithms/pstl/feature_test-3.cc: New test.
	* testsuite/25_algorithms/pstl/feature_test-4.cc: New test.
	* testsuite/25_algorithms/pstl/feature_test-5.cc: New test.

	* include/bits/stl_iterator.h (__cpp_lib_array_constexpr): Define
	different values for C++17 and C++20, to indicate different feature
	sets. Update value for C++20 to indicate P1032R1 support.
	* include/std/version (__cpp_lib_array_constexpr): Likewise.
	* testsuite/23_containers/array/comparison_operators/constexpr.cc:
	Check feature test macro.
	* testsuite/23_containers/array/element_access/constexpr_c++17.cc:
	New test.
	* testsuite/23_containers/array/requirements/constexpr_fill.cc: Check
	feature test macro.
	* testsuite/23_containers/array/requirements/constexpr_iter.cc: Test
	in C++17 mode and check feature test macro.

	* include/std/utility (__cpp_lib_constexpr_algorithms): Do not define
	here.
	* testsuite/20_util/exchange/constexpr.cc: Do not expect macro to be
	defined by <utility>.

	* include/std/functional (__cpp_lib_concepts): Update macro value to
	indicate P1964R2 support.
	* include/std/version (__cpp_lib_concepts): Likewise.
	* testsuite/std/concepts/1.cc: Adjust expected value.
	* testsuite/std/concepts/2.cc: Likewise.

	* include/std/functional (__cpp_lib_constexpr_invoke): Rename to
	__cpp_lib_constexpr_functional.
	* include/std/version (__cpp_lib_constexpr_invoke): Likewise.
	* testsuite/20_util/function_objects/invoke/constexpr.cc: Adjust.

	* include/bits/ptr_traits.h (__cpp_lib_constexpr_memory): Define to
	indicate P1006R1 support.
	(__cpp_lib_to_address): Define to indicate P0653R2 support.
	* include/bits/range_access.h (__cpp_lib_ssize): Define to indicate
	P1227R2 support.
	* include/bits/ranges_algo.h (__cpp_lib_shift): Define to indicate
	P0769R2 support.
	* include/std/atomic (__cpp_lib_atomic_float): Define to indicate
	P0020R6 support.
	* include/std/memory (__cpp_lib_assume_aligned): Define to indicate
	P1007R3 support.
	* include/std/memory_resource (__cpp_lib_polymorphic_allocator):
	Define to indicate P0339R6 support.
	* include/std/string_view (__cpp_lib_starts_ends_with): Define to
	indicate P0457R2 support.
	* include/std/type_traits (__cpp_lib_is_nothrow_convertible): Define
	to indicate P0758R1 support.
	(__cpp_lib_remove_cvref): Define to indicate P0550R2 support.
	(__cpp_lib_type_identity): Define to indicate P0887R1 support.
	* include/std/version (__cpp_lib_atomic_float)
	(__cpp_lib_is_nothrow_convertible, __cpp_lib_remove_cvref)
	(__cpp_lib_type_identity, __cpp_lib_assume_aligned)
	(__cpp_lib_constexpr_memory, __cpp_lib_polymorphic_allocator)
	(__cpp_lib_shift, __cpp_lib_ssize, __cpp_lib_starts_ends_with)
	(__cpp_lib_to_address): Define.
	* testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line number.

	* include/bits/stl_map.h (__cpp_lib_map_insertion): Remove old
	macro.
	* include/bits/unordered_map.h (__cpp_lib_unordered_map_insertion):
	Likewise.
	* include/std/version (__cpp_lib_map_insertion)
	(__cpp_lib_unordered_map_insertion): Remove.

	* include/std/condition_variable (__cpp_lib_jthread): Remove
	redundant definition.
	* include/std/stop_token (__cpp_lib_jthread): Update macro value to
	indicate P1869R1 support.
	* include/std/version (__cpp_lib_jthread): Update value.
	* testsuite/30_threads/condition_variable_any/stop_token/1.cc: Check
	for updated macro value.
	* testsuite/30_threads/condition_variable_any/stop_token/2.cc:
	Likewise.
	* testsuite/30_threads/jthread/1.cc: Likewise.
	* testsuite/30_threads/jthread/2.cc: Likewise.
	* testsuite/30_threads/stop_token/1.cc: Likewise.
	* testsuite/30_threads/stop_token/2.cc: Likewise.

	* testsuite/21_strings/basic_string/erasure.cc: Check for
	__cpp_lib_erase_if macro.
	* testsuite/23_containers/deque/erasure.cc: Add header name to #error
	messages.
	* testsuite/23_containers/forward_list/erasure.cc: Likewise.
	* testsuite/23_containers/list/erasure.cc: Likewise.
	* testsuite/23_containers/map/erasure.cc: Likewise.
	* testsuite/23_containers/set/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_map/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_set/erasure.cc: Likewise.
	* testsuite/23_containers/vector/erasure.cc: Likewise.

2020-04-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (__normal_iterator): Use synth-three-way
	to define operator<=>.
	* testsuite/24_iterators/normal_iterator/cmp_c++20.cc: New test.

	* doc/Makefile.am (xml_sources_manual): Add missing XML files.
	* doc/Makefile.in: Regenerate.
	* doc/xml/manual/status_cxx1998.xml: Refer to "this section" instead
	of "this page".
	* doc/xml/manual/status_cxx2011.xml: Formatting and other corrections
	to the C++11 status table.
	* doc/xml/manual/status_cxx2014.xml: Replace list of C++14 feature
	proposals with table matching contents of the C++14 standard.
	* doc/xml/manual/status_cxx2017.xml: Add table matching contents of
	the C++17 standard.
	* doc/html/*: Regenerate.

	PR c++/94149
	* include/std/type_traits (__is_nt_constructible_impl): Add partial
	specializations for bounded arrays with non-empty initializers.
	* testsuite/20_util/is_nothrow_constructible/value_c++20.cc: New test.

2020-04-20  Thomas Rodgers  <trodgers@redhat.com>

	* testsuite/lib/libstdc++.exp: Add additional_flags=
	-DTBB_SUPRESS_DEPRECATED_MESSAGES=1 to suppress warnings when
	compiling with a newer Thread Building Blocks.

2020-04-20  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.

	* testsuite/20_util/is_constructible/51185.cc: Make test class a
	non-aggregate so that the test verifies the same thing in all -std
	modes.
	* testsuite/20_util/is_constructible/value-2.cc: Adjust expected
	results for some types when paren-init for aggregates is supported.

	* include/std/version (__cpp_lib_three_way_comparison): Update value.
	* libsupc++/compare (__cpp_lib_three_way_comparison): Likewise.
	(__detail::__synth3way): Add noexcept-specifier.

	* include/bits/stl_map.h (map): Define operator<=> and remove
	operator< for C++20.
	* include/bits/stl_multimap.h (multimap): Likewise.
	* include/bits/stl_multiset.h (multiset): Likewise.
	* include/bits/stl_set.h (set): Likewise.
	* include/bits/stl_tree.h (_Rb_tree): Likewise.
	(_Rb_tree_iterator, _Rb_tree_const_iterator): Remove redundant
	operator!= for C++20.
	* include/debug/map.h (__gnu_debug::map): Define operator<=> for C++20.
	* include/debug/multimap.h (__gnu_debug::multimap): Likewise.
	* include/debug/multiset.h (__gnu_debug::multiset): Likewise.
	* include/debug/set.h (__gnu_debug::set): Likewise.
	* testsuite/23_containers/map/operators/cmp_c++20.cc: New test.
	* testsuite/23_containers/multimap/operators/cmp_c++20.cc: New test.
	* testsuite/23_containers/multiset/operators/cmp_c++20.cc: New test.
	* testsuite/23_containers/set/operators/cmp_c++20.cc: New test.

2020-04-20  Matthias Kretz  <kretz@kde.org>

	* testsuite/lib/libstdc++.exp: Avoid illegal argument to verbose.

2020-04-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_queue.h (queue): Define operator<=> for C++20.
	* include/bits/stl_stack.h (stack): Likewise.
	* testsuite/23_containers/queue/cmp_c++20.cc: New test.
	* testsuite/23_containers/stack/cmp_c++20.cc: New test.

	* include/bits/unordered_map.h (unordered_map, unordered_multimap):
	Remove redundant operator!= for C++20.
	* include/bits/unordered_set.h (unordered_set, unordered_multiset):
	Likewise.
	* include/debug/unordered_map (unordered_map, unordered_multimap):
	Likewise.
	* include/debug/unordered_set (unordered_set, unordered_multiset):
	Likewise.

	PR other/94629
	* include/debug/formatter.h (_Error_formatter::_Parameter): Fix
	redundant assignment in constructor.

2020-04-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (duration, time_point): Define operator<=> and
	remove redundant operator!= for C++20.
	* testsuite/20_util/duration/comparison_operators/three_way.cc: New
	test.
	* testsuite/20_util/time_point/comparison_operators/three_way.cc: New
	test.

	* testsuite/util/native_type/native_priority_queue.hpp: Use
	allocator_traits to rebind allocator.

2020-04-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/forward_list.h (forward_list): Define operator<=> and
	remove redundant comparison operators for C++20.
	* include/bits/stl_bvector.h (vector<bool, Alloc>): Likewise.
	* include/bits/stl_deque.h (deque): Likewise.
	* include/bits/stl_iterator.h (__normal_iterator): Likewise.
	* include/bits/stl_list.h (list): Likewise.
	* include/bits/stl_vector.h (vector): Likewise.
	* include/debug/deque (__gnu_debug::deque): Likewise.
	* include/debug/forward_list (__gnu_debug::forward_list): Likewise.
	* include/debug/list (__gnu_debug::list): Likewise.
	* include/debug/safe_iterator.h (__gnu_debug::_Safe_iterator):
	Likewise.
	* include/debug/vector (__gnu_debug::vector): Likewise.
	* include/ext/pointer.h (__gnu_cxx::_Pointer_adapter): Define
	operator<=> for C++20.
	* testsuite/23_containers/deque/operators/cmp_c++20.cc: New test.
	* testsuite/23_containers/forward_list/cmp_c++20.cc: New test.
	* testsuite/23_containers/list/cmp_c++20.cc: New test.
	* testsuite/23_containers/vector/bool/cmp_c++20.cc: New test.
	* testsuite/23_containers/vector/cmp_c++20.cc: New test.

	* include/bits/basic_string.h (basic_string): Define operator<=> and
	remove redundant comparison operators for C++20.
	* include/bits/char_traits.h (__gnu_cxx::char_traits, char_traits):
	Add comparison_category members.
	(__detail::__char_traits_cmp_cat): New helper to get comparison
	category from char traits class.
	* include/bits/regex.h (regex_traits::_RegexMask::operator!=): Do not
	define for C++20.
	(sub_match): Define operator<=> and remove redundant comparison
	operators for C++20.
	(match_results): Remove redundant operator!= for C++20.
	* include/std/string_view (basic_string_view): Define operator<=> and
	remove redundant comparison operators for C++20.
	* testsuite/21_strings/basic_string/operators/char/cmp_c++20.cc: New
	test.
	* testsuite/21_strings/basic_string/operators/wchar_t/cmp_c++20.cc:
	New test.
	* testsuite/21_strings/basic_string_view/operations/copy/char/
	constexpr.cc: Initialize variable.
	* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/
	constexpr.cc: Likewise.
	* testsuite/21_strings/basic_string_view/operators/char/2.cc: Add
	dg-do directive and remove comments showing incorrect signatures.
	* testsuite/21_strings/basic_string_view/operators/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operators/char/cmp_c++20.cc:
	New test.
	* testsuite/21_strings/basic_string_view/operators/wchar_t/cmp_c++20.cc:
	New test.
	* testsuite/28_regex/sub_match/compare_c++20.cc: New test.

2020-04-16  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/unsynchronized_pool_resource/allocate.cc: Remove
	name of unused parameter.

2020-04-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_dir.h (file_status): Define operator== for C++20.
	(directory_entry): Define operator<=> and remove redundant comparison
	operators for C++20.
	* include/bits/fs_fwd.h (space_info): Define operator== for C++20.
	* include/bits/fs_path.h (path): Define operator<=> and remove
	redundant comparison operators for C++20.
	* testsuite/27_io/filesystem/path/compare/compare.cc: Fix comment.
	* testsuite/27_io/filesystem/path/compare/lwg2936.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/strings.cc: Likewise.

	* include/bits/allocator.h (operator!=): Do not define for C++20.
	* include/bits/locale_classes.h (operator!=): Likewise.
	* include/bits/std_function.h (operator==(nullptr_t, const function&))
	(operator!=(const function&, nullptr_t))
	(operator!=(nullptr_t, const function&)): Likewise.
	* include/ext/bitmap_allocator.h (operator!=): Likewise.
	* include/ext/debug_allocator.h (operator!=): Likewise.
	* include/ext/extptr_allocator.h (operator!=): Likewise.
	* include/ext/malloc_allocator.h (operator!=): Likewise.
	* include/ext/mt_allocator.h (operator!=): Likewise.
	* include/ext/new_allocator.h (operator!=): Likewise.
	* include/ext/pool_allocator.h (operator!=): Likewise.
	* include/ext/throw_allocator.h (operator!=): Likewise.
	* include/std/bitset (bitset::operator!=): Likewise.
	* include/std/memory_resource (operator!=): Likewise.
	* include/std/scoped_allocator (operator!=): Likewise.

	* include/std/typeindex (operator<=>): Define for C++20.
	* testsuite/20_util/typeindex/comparison_operators_c++20.cc: New test.

2020-04-14  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (compare_three_way): Fix constraint so that
	BUILTIN-PTR-THREE-WAY does not require three_way_comparable_with.
	* testsuite/18_support/comparisons/object/builtin-ptr-three-way.cc:
	New test.

	PR libstdc++/94562
	* include/bits/shared_ptr.h (operator<=>): Define for C++20.
	* include/bits/shared_ptr_base.h (operator<=>): Likewise.
	* include/bits/unique_ptr.h (operator<=>): Add inline specifier.
	* testsuite/20_util/shared_ptr/comparison/cmp_c++20.cc: New test.
	* testsuite/20_util/shared_ptr/comparison/less.cc: Do not expect
	std::less<A*> to be used when comparing std::shared_ptr<A> objects in
	C++20.

	PR libstdc++/94565
	* libsupc++/compare (__unspec): Add noexcept-specifier to constructor.
	* testsuite/18_support/comparisons/categories/94565.cc: New test.

2020-04-13  Iain Sandoe  <iain@sandoe.co.uk>

	* include/std/coroutine: Update coroutines builtin define,
	per n4861.

2020-04-09  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (compare_three_way): Fix noexcept-specifier.
	(strong_order, weak_order, partial_order): Replace uses of <=> with
	compare_three_way function object (LWG 3324).
	* testsuite/18_support/comparisons/algorithms/partial_order.cc: Add
	equality operator so that X satisfies three_way_comparable.
	* testsuite/18_support/comparisons/algorithms/strong_order.cc:
	Likewise.
	* testsuite/18_support/comparisons/algorithms/weak_order.cc: Likewise.

	* include/bits/unique_ptr.h (operator<=>): Define for C++20.
	* testsuite/20_util/default_delete/48631_neg.cc: Adjust dg-error line.
	* testsuite/20_util/default_delete/void_neg.cc: Likewise.
	* testsuite/20_util/unique_ptr/comparison/compare.cc: New test.
	* testsuite/20_util/unique_ptr/comparison/compare_c++20.cc: New test.

2020-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/slice_array.h (operator==(const slice&, const slice&)):
	Define for C++20.
	* include/std/complex (operator==(const T&, const complex<T>&))
	(operator!=(const complex<T>&, const complex<T>&))
	(operator!=(const complex<T>&, const T&))
	(operator!=(const T&, const complex<T>&)): Do not declare for C++20.
	* testsuite/26_numerics/slice/compare.cc: New test.

	* include/std/charconv (to_chars_result, from_chars_result): Add
	defaulted equality comparisons for C++20.
	* testsuite/20_util/from_chars/compare.cc: New test.
	* testsuite/20_util/to_chars/compare.cc: New test.

2020-04-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94520
	* include/std/charconv (__integer_to_chars_result_type)
	(__integer_from_chars_result_type): Use __or_ instead of __or_v_ to
	allow use in C++14.
	* testsuite/20_util/from_chars/1.cc: Run test as C++14 and replace
	use of std::string_view with std::string.
	* testsuite/20_util/from_chars/2.cc: Likewise.
	* testsuite/20_util/to_chars/1.cc: Likewise.
	* testsuite/20_util/to_chars/2.cc: Likewise.

2020-04-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94498
	* include/bits/char_traits.h (__gnu_cxx::char_traits::move): Make it
	usable in constant expressions for C++20.
	(__gnu_cxx::char_traits::copy, __gnu_cxx::char_traits::assign): Add
	_GLIBCXX20_CONSTEXPR.
	(std::char_traits<char>, std::char_traits<wchar_t>)
	(std::char_traits<char8_t>): Make move, copy and assign usable in
	constant expressions for C++20.
	(std::char_traits<char16_t>, std::char_traits<char32_t>): Make move
	and copy usable in constant expressions for C++20.
	* include/std/string_view (basic_string_view::copy): Add
	_GLIBCXX20_CONSTEXPR.
	* testsuite/21_strings/basic_string_view/operations/copy/char/
	constexpr.cc: New test.
	* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/
	constexpr.cc: New test.

2020-04-05  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/appendix_contributing.xml: Refer to Git
	documentation instead of Subversion.  Switch to https.
	* doc/html/manual/appendix_contributing.html: Regenerate.

2020-04-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93960
	* include/bits/ptr_traits.h (__to_address): Add special case for debug
	iterators, to avoid dereferenceable check.
	* testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line number.
	* testsuite/20_util/to_address/debug.cc: New test.

2020-04-01  Andrea Corallo  <andrea.corallo@arm.com>

	* testsuite/experimental/net/execution_context/use_service.cc:
	Require pthread and gthreads.

2020-04-01  Gerald Pfeifer  <gerald@pfeifer.com>

	* doc/xml/manual/appendix_free.xml: Move "free books" list from
	fsf.org to gnu.org.
	* doc/html/manual/appendix_free.html: Regenerate.

2020-03-31  Ville Voutilainen  <ville.voutilainen@gmail.com>

	Library-side tests for parenthesized aggregate init

	PR c++/92878
	PR c++/92947

	* testsuite/20_util/allocator_traits/members/92878_92947.cc: New.
	* testsuite/20_util/any/assign/92878_92947.cc: Likewise.
	* testsuite/20_util/any/cons/92878_92947.cc: Likewise.
	* testsuite/20_util/is_constructible/92878_92947.cc: Likewise.
	* testsuite/20_util/optional/assignment/92878_92947.cc: Likewise.
	* testsuite/20_util/optional/cons/92878_92947.cc: Likewise.
	* testsuite/20_util/pair/cons/92878_92947.cc: Likewise.
	* testsuite/20_util/shared_ptr/creation/92878_92947.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/construct_at/92878_92947.cc:
	Likewise.
	* testsuite/20_util/unique_ptr/creation/92878_92947.cc: Likewise.
	* testsuite/20_util/uses_allocator/92878_92947.cc: Likewise.
	* testsuite/20_util/variant/92878_92947.cc: Likewise.
	* testsuite/23_containers/deque/modifiers/emplace/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/forward_list/modifiers/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/list/modifiers/emplace/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/map/modifiers/emplace/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/multimap/modifiers/emplace/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/multiset/modifiers/emplace/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/priority_queue/92878_92947.cc: Likewise.
	* testsuite/23_containers/queue/92878_92947.cc: Likewise.
	* testsuite/23_containers/set/modifiers/emplace/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/stack/92878_92947.cc: Likewise.
	* testsuite/23_containers/unordered_map/modifiers/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/modifiers/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/modifiers/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/modifiers/92878_92947.cc:
	Likewise.
	* testsuite/23_containers/vector/modifiers/emplace/92878_92947.cc:
	Likewise.

2020-03-28  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/is_constructible/value-2.cc: Fix test to account
	for changes due to parenthesized aggregate-initialization in C++20.
	* testsuite/20_util/time_point/cons/81468.cc: Fix test to not clash
	with std::chrono::sys_time in C++20.

	* include/bits/stl_iterator.h (reverse_iterator): Use requires-clause
	to constrain C++20 versions of comparison operators. Fix backwards
	logic of relational operators.
	(move_iterator): Use requires-clause to constrain comparison operators
	in C++20. Do not declare non-standard same-type overloads for C++20.
	* testsuite/24_iterators/move_iterator/rel_ops_c++20.cc: Check result
	of comparisons and check using greedy_ops type.
	* testsuite/24_iterators/reverse_iterator/rel_ops_c++20.cc: Likewise.
	* testsuite/24_iterators/move_iterator/greedy_ops.cc: Remove redundant
	main function from compile-only test.
	* testsuite/24_iterators/reverse_iterator/greedy_ops.cc: Likewise.

2020-03-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_cmp.h (__cpp_lib_ranges): Define.
	* include/bits/stl_iterator.h: Check value of __cpp_concepts so that
	C++20 concepts are required.
	* include/bits/stl_iterator_base_types.h: Likewise.
	* include/std/concepts: Likewise.
	* include/std/version: Likewise.
	* testsuite/std/ranges/headers/ranges/synopsis.cc: Check feature test
	macro.

	* include/bits/stl_iterator.h (reverse_iterator::iterator_concept)
	(reverse_iterator::iterator_category): Define for C++20.
	(reverse_iterator): Define comparison operators correctly for C++20.
	(__normal_iterator): Add constraints to comparison operators for C++20.
	(move_iterator::operator++(int)) [__cpp_lib_concepts]: Define new
	overload for input iterators.
	(move_iterator): Add constraints to comparison operators for C++20.
	Define operator<=> for C++20.
	* testsuite/24_iterators/move_iterator/input_iterator.cc: New test.
	* testsuite/24_iterators/move_iterator/move_only.cc: New test.
	* testsuite/24_iterators/move_iterator/rel_ops_c++20.cc: New test.
	* testsuite/24_iterators/reverse_iterator/rel_ops_c++20.cc: New test.

	* include/bits/iterator_concepts.h (__detail::__decay_copy)
	(__detail::__member_begin, __detail::__adl_begin): Move here from
	<bits/range_access.h>.
	(__detail::__ranges_begin, __detail::__range_iter_t): Define.
	* bits/range_access.h (__cust_access::__decay_copy)
	(__cust_access::__member_begin, __cust_access::__adl_begin): Move to
	<bits/iterator_concepts.h>.
	(ranges::iterator_t): Use __detail::__range_iter_t.
	* include/bits/stl_iterator.h (back_insert_iterator): Simplify
	conditional compilation. Add _GLIBCXX20_CONSTEXPR to all members.
	(front_insert_iterator): Likewise.
	(insert_iterator): Implement changes from P0896R4 for C++20.
	* testsuite/24_iterators/back_insert_iterator/constexpr.cc: New test.
	* testsuite/24_iterators/front_insert_iterator/constexpr.cc: New test.
	* testsuite/24_iterators/headers/iterator/synopsis_c++17.cc: Adjust
	for inclusion in synopsis_c++20.cc which expects different signatures
	for some function templates.
	* testsuite/24_iterators/insert_iterator/constexpr.cc: New test.

	* include/std/type_traits (__is_array_convertible): Move definition
	to immediately after is_convertible.

2020-03-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (chrono::days, chrono::weeks, chrono::years)
	(chrono::months, chrono::sys_days, chrono::local_t)
	(chrono::local_time, chrono::local_seconds, chrono::local_days):
	Define for C++20.
	(chrono::time_point): Add missing static assert.
	* testsuite/20_util/time_point/requirements/duration_neg.cc: New test.
	* testsuite/std/time/clock/file/overview.cc: New test.
	* testsuite/std/time/clock/file/members.cc: New test.
	* testsuite/std/time/syn_c++20.cc: New test.

2020-03-25  Mike Crowe  <mac@mcrowe.com>

	* testsuite/30_threads/shared_timed_mutex/try_lock_until/1.cc: New
	test.
	* testsuite/30_threads/shared_timed_mutex/try_lock_until/2.cc: New
	test.

2020-03-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_fwd.h (filesystem::__file_clock): Move to ...
	* include/std/chrono (filesystem::__file_clock): Here.
	(filesystem::__file_clock::from_sys, filesystem::__file_clock::to_sys):
	Define public member functions for C++20.
	(is_clock, is_clock_v): Define traits for C++20.
	* include/std/condition_variable (condition_variable::wait_until): Add
	check for valid clock.
	* include/std/future (_State_baseV2::wait_until): Likewise.
	* include/std/mutex (__timed_mutex_impl::_M_try_lock_until): Likewise.
	* include/std/shared_mutex (shared_timed_mutex::try_lock_shared_until):
	Likewise.
	* include/std/thread (this_thread::sleep_until): Likewise.
	* testsuite/30_threads/condition_variable/members/2.cc: Qualify
	slow_clock with new namespace.
	* testsuite/30_threads/condition_variable/members/clock_neg.cc: New
	test.
	* testsuite/30_threads/condition_variable_any/members/clock_neg.cc:
	New test.
	* testsuite/30_threads/future/members/clock_neg.cc: New test.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_until/3.cc:
	Qualify slow_clock with new namespace.
	* testsuite/30_threads/recursive_timed_mutex/try_lock_until/
	clock_neg.cc: New test.
	* testsuite/30_threads/shared_future/members/clock_neg.cc: New
	test.
	* testsuite/30_threads/shared_lock/locking/clock_neg.cc: New test.
	* testsuite/30_threads/shared_timed_mutex/try_lock_until/clock_neg.cc:
	New test.
	* testsuite/30_threads/timed_mutex/try_lock_until/3.cc: Qualify
	slow_clock with new namespace.
	* testsuite/30_threads/timed_mutex/try_lock_until/4.cc: Likewise.
	* testsuite/30_threads/timed_mutex/try_lock_until/clock_neg.cc: New
	test.
	* testsuite/30_threads/unique_lock/locking/clock_neg.cc: New test.
	* testsuite/std/time/traits/is_clock.cc: New test.
	* testsuite/util/slow_clock.h (slow_clock): Move to __gnu_test
	namespace.

2020-03-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93245
	* include/experimental/bits/fs_path.h (path::generic_string<C,T,A>()):
	* testsuite/experimental/filesystem/path/generic/generic_string.cc:
	Improve test coverage.

	PR libstdc++/94242
	* include/bits/fs_path.h (path::_S_str_convert): Replace first
	parameter with basic_string_view so that strings with different
	allocators can be accepted.
	(path::generic_string<C,T,A>()): Use basic_string object that uses the
	right allocator type.
	* testsuite/27_io/filesystem/path/generic/94242.cc: New test.
	* testsuite/27_io/filesystem/path/generic/generic_string.cc: Improve
	test coverage.

2020-03-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94033
	* include/std/type_traits (__is_nt_default_constructible_atom): Remove.
	(__is_nt_default_constructible_impl): Remove.
	(__is_nothrow_default_constructible_impl): Remove.
	(__is_nt_constructible_impl): Add bool template parameter. Adjust
	partial specializations.
	(__is_nothrow_constructible_impl): Replace class template with alias
	template.
	(is_nothrow_default_constructible): Derive from alias template
	__is_nothrow_constructible_impl instead of
	__is_nothrow_default_constructible_impl.
	* testsuite/20_util/is_nothrow_constructible/94003.cc: New test.

	* include/std/stop_token (stop_token::_Stop_state_ref): Define
	comparison operators explicitly if the compiler won't synthesize them.

	* include/bits/stl_algobase.h (__lexicographical_compare_aux): Check
	__cpp_lib_concepts before using iter_reference_t.
	* include/bits/stream_iterator.h (istream_iterator): Check
	__cpp_lib_concepts before using default_sentinel_t.
	* include/bits/streambuf_iterator.h (istreambuf_iterator): Likewise.

	PR libstdc++/94203
	* include/experimental/executor (executor::executor(Executor)): Call
	make_shared directly instead of _M_create. Create _Tgt1 object.
	(executor::executor(allocator_arg_t, const ProtoAlloc&, Executor)):
	Call allocate_shared directly instead of _M_create. Create _Tgt2
	object.
	(executor::target_type): Add cast needed for new _Tgt interface.
	(executor::target): Define when RTTI is disabled. Use _Tgt::_M_func.
	(executor::_Tgt): Define the same interface whether RTTI is enabled or
	not.
	(executor::_Tgt::target_type, executor::_Tgt::target): Do not use
	std::type_info in the interface.
	(executor::_Tgt::_M_func): Add data member.
	(executor::_TgtImpl): Replace with _Tgt1 and _Tgt2 class templates.
	(executor::_Tgt1::_S_func): Define function to access target without
	depending on RTTI.
	(executor::_M_create): Remove.
	(operator==, operator!=): Simplify comparisons for executor.
	* include/experimental/socket (is_error_code_enum<socket_errc>):
	Define specialization before use.
	* testsuite/experimental/net/executor/1.cc: New test.

2020-03-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94199
	* include/experimental/executor (service_already_exists): Add default
	constructor. Declare make_service to be a friend.
	* testsuite/experimental/net/execution_context/make_service.cc: New
	test.

2020-03-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/tr1/8_c_compatibility/cstdlib/functions.cc: Do not pass
	a null pointer to functions with nonnull(1) attribute.

2020-03-11  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (split_view::_OuterIter::_OuterIter): Typo fix,
	'address' -> 'std::__addressof'.
	* testsuite/std/ranges/adaptors/split.cc: Test taking the split_view of
	a non-forward input_range.
	* testsuite/util/testsuite_iterators.h (output_iterator_wrapper): Make
	default constructor protected instead of deleted, like with
	input_iterator_wrapper.
	(test_range::iterator): Add comment explaining that this type is used
	only when the underlying wrapper is input_iterator_wrapper or
	output_iterator_wrapper.  Remove delegating defaulted constructor so
	that the inherited default constructor is used instead.

	LWG 3286 ranges::size is not required to be valid after a call to
	ranges::begin on an input range
	* include/std/ranges (subrange::subrange): Split single-argument
	constructor into two, one constrained by _S_store_size and another by
	!_S_store_size.
	(take_view::begin): Call size() before calling ranges::begin(_M_base).
	* testsuite/std/ranges/adaptors/lwg3286.cc: New test.
	* testsuite/std/ranges/subrange/lwg3286.cc: New test.

2020-03-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (split_view::_OuterIter::__at_end): Use __current
	instead of _M_current.
	(split_view::_OuterIter::operator++): Likewise.

	* include/std/ranges (transform_view::_Iterator::__iter_move): Remove.
	(transform_view::_Iterator::operator*): Add noexcept-specifier.
	(transform_view::_Iterator::iter_move): Inline __iter_move body here.
	(split_view::_OuterIter::__current): Add noexcept.
	(split_view::_InnerIter::__iter_swap): Remove.
	(split_view::_InnerIter::__iter_move): Remove.
	(split_view::_InnerIter::_M_i_current): New accessors.
	(split_view::_InnerIter::__at_end): Use _M_i_current().
	(split_view::_InnerIter::operator*): Likewise.
	(split_view::_InnerIter::operator++): Likewise.
	(iter_move(const _InnerIter&)): Likewise.
	(iter_swap(const _InnerIter&, const _InnerIter&)): Likewise.
	* testsuite/std/ranges/adaptors/split.cc: Check noexcept-specifier
	for iter_move and iter_swap on split_view's inner iterator.

	PR c++/94117
	* include/std/ranges (ranges::transform_view::_Iterator::iter_move):
	Change expression in noexcept-specifier to match function body.

	* testsuite/23_containers/unordered_set/allocator/ext_ptr.cc: Add
	comment explaining multiple dg-do directives.
	* testsuite/24_iterators/ostream_iterator/1.cc: Fix do-do directive
	so test is run as well as compiled.

2020-03-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94063
	* src/c++17/fs_path.cc (path::operator+=(const path&)): Add kluge to
	handle concatenations that change the type of the first component.
	(path::operator+=(basic_string_view<value_type>)): Likewise.
	* testsuite/27_io/filesystem/path/concat/94063.cc: New test.

2020-03-06  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (join_view::_Sentinel<_Const>): Befriend
	join_view::_Sentinel<!_Const>.
	* testsuite/std/ranges/adaptors/join.cc: Augment test.

	PR libstdc++/93978
	* include/bits/range_access.h (__cust_access::_Empty::operator()):
	Declare return type to be bool instead of auto.
	* testsuite/std/ranges/adaptors/93978.cc: New test.

2020-03-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94069
	* include/std/shared_mutex [!PTHREAD_RWLOCK_INITIALIZER]
	(__shared_mutex_pthread::__shared_mutex_pthread()): Remove incorrect
	second argument to __glibcxx_rwlock_init.
	* testsuite/30_threads/shared_timed_mutex/94069.cc: New test.

	PR libstdc++/93244
	* testsuite/27_io/filesystem/path/generic/generic_string.cc: Adjust
	test to not fail due to PR 94063.
	* testsuite/27_io/filesystem/path/generic/utf.cc: Likewise.
	* testsuite/27_io/filesystem/path/generic/wchar_t.cc: Likewise.

2020-03-06  Andreas Krebbel  <krebbel@linux.ibm.com>

	* src/c++11/system_error.cc: Omit the ENOTSUP case statement if it
	would match ENOSYS.

2020-03-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/operations/all.cc: Mark unused variable.
	* testsuite/27_io/filesystem/operations/copy.cc: Fix typo.
	* testsuite/experimental/filesystem/operations/copy.cc: Likewise.
	* testsuite/27_io/filesystem/operations/file_size.cc: Use correct type
	for return value, and in comparison.
	* testsuite/experimental/filesystem/operations/file_size.cc: Likewise.

	PR libstdc++/94051
	* include/std/string_view: Include <bits/ostream_insert.h>.
	* testsuite/21_strings/basic_string_view/inserters/94051.cc: New test.

2020-03-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/cpp_type_traits.h (__memcpyable): Fix comment.

2020-03-04  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/94017
	* include/bits/ranges_algobase.h (__fill_n_fn::operator()): Refine
	condition for when to use memset, making sure to additionally check that
	the output pointer's value type is a non-volatile byte type.  Instead of
	requiring that the fill type is a byte type, just require that it's an
	integral type.
	* testsuite/20_util/specialized_algorithms/uninitialized_fill/94017.cc:
	New test.
	* testsuite/20_util/specialized_algorithms/uninitialized_fill_n/94017.cc:
	New test.
	* testsuite/25_algorithms/fill/94013.cc: Uncomment part of test that was
	blocked by PR 94017.
	* testsuite/25_algorithms/fill/94017.cc: New test.
	* testsuite/25_algorithms/fill_n/94017.cc: New test.

	LWG 3355 The memory algorithms should support move-only input iterators
	introduced by P1207
	* include/bits/ranges_uninitialized.h
	(__uninitialized_copy_fn::operator()): Use std::move to avoid attempting
	to copy __ifirst, which could be a move-only input iterator.  Use
	operator- instead of ranges::distance to compute distance from a sized
	sentinel.
	(__uninitialized_copy_n_fn::operator()): Likewise.
	(__uninitialized_move_fn::operator()): Likewise.
	(__uninitialized_move_n_fn::operator()): Likewise.
	(__uninitialized_destroy_fn::operator()): Use std::move to avoid
	attempting to copy __first.
	(__uninitialized_destroy_n_fn::operator()): Likewise.
	* testsuite/20_util/specialized_algorithms/destroy/constrained.cc:
	Augment test.
	* .../specialized_algorithms/uninitialized_copy/constrained.cc:
	Likewise.
	* .../specialized_algorithms/uninitialized_move/constrained.cc:
	Likewise.

	* testsuite/util/testsuite_iterators.h (test_range::get_iterator): Make
	protected instead of private.
	(test_sized_range_sized_sent): New.

	* testsuite/util/testsuite_iterators.h (input_iterator_wrapper_nocopy):
	New testsuite iterator.
	* testsuite/24_iterators/counted_iterator/lwg3389.cc: use it.
	* testsuite/24_iterators/move_iterator/lwg3390.cc: Likewise.

	* include/bits/ranges_uninitialized.h
	(uninitialized_copy_fn::operator()): Pass a reference type as the first
	argument to is_nothrow_assignable_v.
	(uninitialized_copy_fn::operator()): Likewise.
	(uninitialized_move_fn::operator()): Likewise.  Return an in_out_result
	with the input iterator stripped of its move_iterator.
	(uninitialized_move_n_fn::operator()): Likewise.
	(uninitialized_fill_fn::operator()): Pass a reference type as the first
	argument to is_nothrow_assignable_v.
	(uninitialized_fill_n_fn::operator()): Likewise.

2020-03-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/94013
	* include/bits/cpp_type_traits.h (__memcpyable, __memcmpable): New
	traits to control when to use memmove and memcmp optimizations.
	(__is_nonvolatile_trivially_copyable): New helper trait.
	* include/bits/ranges_algo.h (__lexicographical_compare_fn): Do not
	use memcmp optimization with volatile data.
	* include/bits/ranges_algobase.h (__equal_fn): Use __memcmpable.
	(__copy_or_move, __copy_or_move_backward): Use __memcpyable.
	* include/bits/stl_algobase.h (__copy_move_a2): Use __memcpyable.
	(__copy_move_backward_a2): Likewise.
	(__equal_aux1): Use __memcmpable.
	(__lexicographical_compare_aux): Do not use memcmp optimization with
	volatile data.
	* testsuite/25_algorithms/copy/94013.cc: New test.
	* testsuite/25_algorithms/copy_backward/94013.cc: New test.
	* testsuite/25_algorithms/equal/94013.cc: New test.
	* testsuite/25_algorithms/fill/94013.cc: New test.
	* testsuite/25_algorithms/lexicographical_compare/94013.cc: New test.
	* testsuite/25_algorithms/move/94013.cc: New test.
	* testsuite/25_algorithms/move_backward/94013.cc: New test.

	* include/bits/stl_algobase.h (lexicographical_compare_three_way):
	Avoid redundant iterator comparisons (LWG 3410).

2020-03-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93972
	* include/bits/stl_algobase.h (__memcmp): Allow pointer types to
	differ.
	* testsuite/25_algorithms/lexicographical_compare/uchar.cc: New test.

	* include/std/ranges (__detail::__maybe_empty_t): Rename to
	__maybe_present_t.
	(__adaptor::_RangeAdaptor, join_view, split_view): Use new name.

	* include/bits/ranges_algo.h (shift_right): Add 'typename' to
	dependent type.

2020-03-01  H.J. Lu  <hongjiu.lu@intel.com>

	* config/abi/post/x86_64-linux-gnu/x32/baseline_symbols.txt: Updated.

2020-02-29  John David Anglin  <danglin@gcc.gnu.org>

	* testsuite/17_intro/headers/c++1998/charset.cc: Skip on *-*-hpux*.
	* testsuite/17_intro/headers/c++2011/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2014/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2017/charset.cc: Likewise.
	* testsuite/17_intro/headers/c++2020/charset.cc: Likewise.

	* testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc:
	Add libatomic option.
	* testsuite/30_threads/jthread/jthread.cc: Likewise.

2020-02-29  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_algo.h
	(__find_if, __count_if, __is_permutation, std::is_permutation): Move...
	* include/bits/stl_algobase.h: ...here.
	* include/bits/hashtable_policy.h: Remove <bits/stl_algo.h> include.

2020-02-29  John David Anglin  <danglin@gcc.gnu.org>

	* testsuite/30_threads/stop_token/stop_callback.cc: Add libatomic
	option.
	* testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc:
	Likewise.
	* testsuite/30_threads/stop_token/stop_callback/deadlock.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_callback/destroy.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_callback/invoke.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_source.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_source/assign.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_token.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_token/stop_possible.cc:
	Likewise.

	PR libstdc++/92906
	* config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.

2020-02-28  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/93972
	* include/bits/ranges_algo.h (__lexicographical_compare_fn::operator()):
	Fix condition for when to use memcmp, making it consistent with the
	corresponding condition used in std::lexicographical_compare.
	* testsuite/25_algorithms/lexicographical_compare/93972.cc: New test.

	* testsuite/26_numerics/headers/numeric/synopsis.cc: Add signatures for
	functions introduced in C++11, C++17 and C++2a.  Add 'constexpr' to
	existing signatures for C++2a.

2020-02-28  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/24_iterators/range_operations/advance_debug_neg.cc: Run
	test instead of just compiling it.

2020-02-28  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (reverse_view::_S_needs_cached_begin): Set to false
	whenever the underlying range models common_range.

	* include/std/ranges (__detail::_CachedPosition): New struct.
	(views::filter_view::_S_needs_cached_begin): New member variable.
	(views::filter_view::_M_cached_begin): New member variable.
	(views::filter_view::begin): Use _M_cached_begin to cache its
	result.
	(views::drop_view::_S_needs_cached_begin): New static member variable.
	(views::drop_view::_M_cached_begin): New member variable.
	(views::drop_view::begin): Use _M_cached_begin to cache its result
	when _S_needs_cached_begin.
	(views::drop_while_view::_M_cached_begin): New member variable.
	(views::drop_while_view::begin): Use _M_cached_begin to cache its
	result.
	(views::reverse_view::_S_needs_cached_begin): New static member
	variable.
	(views::reverse_view::_M_cached_begin): New member variable.
	(views::reverse_view::begin): Use _M_cached_begin to cache its result
	when _S_needs_cached_begin.
	* testsuite/std/ranges/adaptors/drop.cc: Augment test to check that
	drop_view::begin caches its result.
	* testsuite/std/ranges/adaptors/drop_while.cc: Augment test to check
	that drop_while_view::begin caches its result.
	* testsuite/std/ranges/adaptors/filter.cc: Augment test to check that
	filter_view::begin caches its result.
	* testsuite/std/ranges/adaptors/reverse.cc: Augment test to check that
	reverse_view::begin caches its result.

2020-02-28  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/operations/last_write_time.cc: Fixes for
	filesystems that silently truncate timestamps.
	* testsuite/experimental/filesystem/operations/last_write_time.cc:
	Likewise.

	* testsuite/21_strings/basic_string/cons/char/1.cc: Disable
	-Wstringop-overflow warnings.

2020-02-27  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp (v3_target_compile): Add
	-fdiagnostics-urls=never to options.

2020-02-27  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (transform_view::_Iterator<_Const>): Befriend
	_Iterator<!_Const>.
	(transform_view::_Sentinel<_Const>): Befriend _Sentinel<!_Const>.
	(take_view::_Sentinel<_Const>): Likewise.
	(take_while_view::_Sentinel<_Const>): Likewise.
	(split_view::_OuterIter<_Const>): Befriend _OuterIter<!_Const>.
	* testsuite/std/ranges/adaptors/split.cc: Augment test.
	* testsuite/std/ranges/adaptors/take.cc: Augment test.
	* testsuite/std/ranges/adaptors/take_while.cc: Augment test.
	* testsuite/std/ranges/adaptors/transform.cc: Augment test.

	* testsuite/25_algorithms/copy/constrained.cc: Don't assume that the
	base() of a vector<>::iterator is a pointer.
	* testsuite/25_algorithms/copy_backward/constrained.cc: Likewise.
	* testsuite/25_algorithms/move/constrained.cc: Likewise.
	* testsuite/25_algorithms/move_backward/constrained.cc: Likewise.
	* testsuite/25_algorithms/inplace_merge/constrained.cc: Use foo.data()
	instead of &foo[0].
	* testsuite/25_algorithms/partial_sort/constrained.cc: Likewise.
	* testsuite/25_algorithms/partial_sort_copy/constrained.cc: Likewise.
	* testsuite/25_algorithms/shuffle/constrained.cc: Likewise.
	* testsuite/25_algorithms/sort/constrained.cc: Likewise.
	* testsuite/25_algorithms/stable_sort/constrained.cc: Likewise.

2020-02-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/debug/array (operator<=>): Define for C++20.
	* testsuite/23_containers/array/tuple_interface/get_debug_neg.cc:
	Adjust dg-error line numbers.
	* testsuite/23_containers/array/tuple_interface/
	tuple_element_debug_neg.cc: Likewise.

	* testsuite/23_containers/span/back_assert_neg.cc: Add #undef before
	defining _GLIBCXX_ASSERTIONS.
	* testsuite/23_containers/span/first_2_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/first_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/front_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/index_op_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/last_2_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/last_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/subspan_2_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/subspan_3_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/subspan_4_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/subspan_5_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/subspan_6_assert_neg.cc: Likewise.
	* testsuite/23_containers/span/subspan_assert_neg.cc: Likewise.

	* include/debug/string (__gnu_debug::basic_string::insert): Fix for
	C++98 where the member function of the base class returns void.

	* testsuite/util/testsuite_iterators.h (forward_iterator_wrapper): Add
	equality comparisons that support value-initialized iterators.

	* include/bits/boost_concept_check.h (__function_requires): Add
	_GLIBCXX14_CONSTEXPR.
	* testsuite/25_algorithms/min/concept_checks.cc: New test.

2020-02-26  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/93936
	* include/std/ranges (split_view::_InnerIter::operator==): Compare
	the operands' _M_i rather than their _M_i.current().
	* testsuite/std/ranges/adaptors/split.cc: Augment test.

	P1645R1 constexpr for <numeric> algorithms
	* include/bits/stl_numeric.h (iota, accumulate, inner_product,
	partial_sum, adjacent_difference): Make conditionally constexpr for
	C++20.
	* include/std/numeric (__cpp_lib_constexpr_numeric): Define this feature
	test macro.
	(reduce, transform_reduce, exclusive_scan, inclusive_scan,
	transform_exclusive_scan, transform_inclusive_scan): Make conditionally
	constexpr for C++20.
	* include/std/version (__cpp_lib_constexpr_numeric): Define.
	* testsuite/26_numerics/accumulate/constexpr.cc: New test.
	* testsuite/26_numerics/adjacent_difference/constexpr.cc: Likewise.
	* testsuite/26_numerics/exclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/inclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/inner_product/constexpr.cc: Likewise.
	* testsuite/26_numerics/iota/constexpr.cc: Likewise.
	* testsuite/26_numerics/partial_sum/constexpr.cc: Likewise.
	* testsuite/26_numerics/reduce/constexpr.cc: Likewise.
	* testsuite/26_numerics/transform_exclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/transform_inclusive_scan/constexpr.cc: Likewise.
	* testsuite/26_numerics/transform_reduce/constexpr.cc: Likewise.

2020-02-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_algo.h (__lexicographical_compare_fn): Declare
	variables in smaller scope and avoid calling ranges::distance when we
	know they are pointers. Remove statically-unreachable use of
	__builtin_unreachable().
	* include/bits/stl_algobase.h (__lexicographical_compare::__lc):
	Define inline.

	* include/std/ranges (__detail::__maybe_empty_t): Define new helper
	alias.
	(__detail::__maybe_const_t): Likewise.
	(__adaptor::_RangeAdaptor): Use __maybe_empty_t.
	(transform_view, take_view, take_while_view, elements_view): Use
	__maybe_const_t.
	(join_view, split_view): Use both.

2020-02-25  Patrick Palka  <ppalka@redhat.com>

	LWG 3397 basic_istream_view::iterator should not provide
	iterator_category
	* include/std/ranges (basic_istream_view:_Iterator::iterator_category):
	Rename to ...
	(basic_istream_view:_Iterator::iterator_concept): ... this.
	* testsuite/std/ranges/istream_view.cc: Augment test.

	LWG 3325 Constrain return type of transformation function for
	transform_view
	* include/std/ranges (transform_view): Constrain the return type of the
	transformation function as per LWG 3325.
	* testsuite/std/ranges/adaptors/lwg3325_neg.cc: New test.

	LWG 3313 join_view::_Iterator::operator-- is incorrectly constrained
	* include/std/ranges (join_view::_Iterator::operator--): Require that
	range_reference_t<_Base> models common_range.
	* testsuite/std/ranges/adaptors/lwg3313_neg.cc: New test.

	LWG 3301 transform_view::_Iterator has incorrect iterator_category
	* include/std/ranges (transform_view::_Iterator::_S_iter_cat): Adjust
	determination of iterator_category as per LWG 3301.
	* testsuite/std/ranges/adaptors/transform.cc: Augment test.

	LWG 3292 iota_view is under-constrained
	* include/std/ranges (iota_view): Require that _Winc models semiregular
	  as per LWG 3292.
	* testsuite/std/ranges/iota/lwg3292_neg.cc: New test.

2020-02-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_algobase.h (__copy_or_move): Do not use memmove
	during constant evaluation. Call __builtin_memmove directly instead of
	__memmove.
	(__copy_or_move_backward): Likewise.
	* include/bits/stl_algobase.h (__memmove): Remove.
	(__copy_move<M, true, random_access_iterator_tag>::__copy_m)
	(__copy_move_backward<M, true, random_access_iterator_tag>::__copy_m):
	Use __builtin_memmove directly instead of __memmove.
	(__copy_move_a2): Do not use memmove during constant evaluation.
	(__copy_move_backward_a2): Use _IsMove constant to select correct
	__copy_move_backward specialization.
	* testsuite/25_algorithms/copy_backward/constexpr.cc: Check for copies
	begin turned into moves during constant evaluation.

	* testsuite/25_algorithms/move_backward/93872.cc: Add test left out of
	previous commit.

	PR libstdc++/93872
	* include/bits/stl_algobase.h (__memmove): Cast away const before
	doing move assignment.
	* testsuite/25_algorithms/move/93872.cc: New test.
	* testsuite/25_algorithms/move_backward/93872.cc: New test.

2020-02-24  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/93884
	* include/bits/ranges_algobase.h (__copy_or_move,
	__copy_or_move_backward): Don't inspect the iter_value_t of the output
	iterator, instead inspect its iterator_traits directly.
	* include/bits/stl_iterator.h (back_insert_iterator::container):
	Conditionally initialize.
	(back_insert_iterator::difference_type): Conditionally define.
	(back_insert_iterator::back_insert_iterator): Conditionally define this
	default constructor.
	(front_insert_iterator::container): Conditionally initialize.
	(front_insert_iterator::difference_type): Conditionally define.
	(front_insert_iterator::front_insert_iterator): Conditionally define
	this default constructor.
	* 24_iterators/back_insert_iterator/pr93884.cc: New test.
	* 24_iterators/front_insert_iterator/pr93884.cc: New test.

	P0769R2 Add shift to <algorithm>
	* include/bits/ranges_algo.h (shift_left, shift_right): New.
	* testsuite/25_algorithms/shift_left/1.cc: New test.
	* testsuite/25_algorithms/shift_right/1.cc: New test.

2020-02-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
	Make noexcept-specifier conditional.
	* testsuite/24_iterators/istream_iterator/cons/sentinel.cc: Check
	noexcept-specifier.

	* include/bits/stream_iterator.h (istream_iterator(default_sentinel_t)):
	Add constructor.
	(operator==(istream_iterator, default_sentinel_t)): Add operator.
	(ostream_iterator::difference_type): Define to ptrdiff_t for C++20.
	* include/bits/streambuf_iterator.h
	(istreambuf_iterator(default_sentinel_t)): Add constructor.
	(operator==(istreambuf_iterator, default_sentinel_t)): Add operator.
	* testsuite/24_iterators/istream_iterator/cons/sentinel.cc:
	New test.
	* testsuite/24_iterators/istream_iterator/sentinel.cc: New test.
	* testsuite/24_iterators/istreambuf_iterator/cons/sentinel.cc:
	New test.
	* testsuite/24_iterators/istreambuf_iterator/sentinel.cc: New test.

	* include/std/ranges (__deep_const_range, __enable_view_impl): Remove.
	(ranges::enable_view): Simplify (LWG 3326).
	* include/bits/range_access.h (ranges::enable_view): Declare.
	* include/bits/regex.h (__enable_view_impl): Remove partial
	specialization.
	* include/bits/stl_multiset.h (__enable_view_impl): Likewise.
	* include/bits/stl_set.h (__enable_view_impl): Likewise.
	* include/bits/unordered_set.h (__enable_view_impl): Likewise.
	* include/debug/multiset.h (__enable_view_impl): Likewise.
	* include/debug/set.h (__enable_view_impl): Likewise.
	* include/debug/unordered_set (__enable_view_impl): Likewise.
	* include/experimental/string_view (ranges::enable_view): Define
	partial specialization.
	* include/std/span (ranges::enable_view): Likewise.
	* include/std/string_view (ranges::enable_view): Likewise.
	* testsuite/std/ranges/view.cc: Check satisfaction of updated concept.

2020-02-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/optional (operator<=>(optional<T>, optional<U>))
	(operator<=>(optional<T>, nullopt), operator<=>(optional<T>, U)):
	Define for C++20.
	* include/std/tuple (__tuple_cmp): New helper function for <=>.
	(operator<=>(tuple<T...>, tuple<U>...)): Define for C++20.
	* include/std/variant (operator<=>(variant<T...>, variant<T...>))
	(operator<=>(monostate, monostate)): Define for C++20.
	* testsuite/20_util/optional/relops/three_way.cc: New test.
	* testsuite/20_util/tuple/comparison_operators/three_way.cc: New test.
	* testsuite/20_util/variant/89851.cc: Move to ...
	* testsuite/20_util/variant/relops/89851.cc: ... here.
	* testsuite/20_util/variant/90008.cc: Move to ...
	* testsuite/20_util/variant/relops/90008.cc: ... here.
	* testsuite/20_util/variant/relops/three_way.cc: New test.

2020-02-20  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (views::__adaptor::__maybe_refwrap): New utility
	function.
	(views::__adaptor::_RangeAdaptor::operator()): Add comments.  Use
	__maybe_refwrap to capture lvalue references by reference, and then use
	unwrap_reference_t to forward the by-reference captures as references.
	* testsuite/std/ranges/adaptors/split.cc: Augment test.
	* testsuite/std/ranges/adaptors/split_neg.cc: New test.

	* include/std/ranges (iota_view): Forward declare _Sentinel.
	(iota_view::_Iterator): Befriend _Sentinel.
	(iota_view::_Sentinel::_M_equal): New member function.
	(iota_view::_Sentinel::operator==): Use it.
	(views::_Iota::operator()): Forward __f using the correct type.
	* testsuite/std/ranges/access/ssize.cc (test06): Don't call views::iota
	with integers of different signedness, to appease iota_view's deduction
	guide.
	* testsuite/std/ranges/iota/iota_view.cc: Augment test.

2020-02-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (ranges::begin): Reject array of
	incomplete type.
	(ranges::end, ranges::size): Require arrays to be bounded.
	(ranges::data): Require lvalue or borrowed_range.
	(ranges::iterator_t): Remove constraint.
	* testsuite/std/ranges/access/begin.cc: Do not check array of
	incomplete type.
	* testsuite/std/ranges/access/begin_neg.cc: New test.
	* testsuite/std/ranges/access/end_neg.cc: Adjust expected error.
	* testsuite/std/ranges/access/size_neg.cc: Adjust expected error.
	* testsuite/std/ranges/access/ssize.cc: Do not check array of
	incomplete type.

	* include/std/system_error (error_category::operator<=>)
	(operator<=>(const error_code&, const error_code&))
	(operator<=>(const error_condition&, const error_condition&)): Define
	for C++20.
	* testsuite/19_diagnostics/error_category/operators/less.cc: New test.
	* testsuite/19_diagnostics/error_category/operators/three_way.cc: New
	test.
	* testsuite/19_diagnostics/error_code/operators/equal.cc: Remove
	incorrect comment.
	* testsuite/19_diagnostics/error_code/operators/less.cc: New test.
	* testsuite/19_diagnostics/error_code/operators/not_equal.cc: Remove
	incorrect comment.
	* testsuite/19_diagnostics/error_code/operators/three_way.cc: New test.
	* testsuite/19_diagnostics/error_condition/operators/equal.cc: Remove
	incorrect comment.
	* testsuite/19_diagnostics/error_condition/operators/less.cc: New test.
	* testsuite/19_diagnostics/error_condition/operators/not_equal.cc:
	Remove incorrect comment.
	* testsuite/19_diagnostics/error_condition/operators/three_way.cc: New
	test.

	* libsupc++/typeinfo (type_info::operator!=): Remove for C++20.

	* include/std/thread (thread::id::operator<=>): Define for C++20.
	* testsuite/30_threads/thread/id/70294.cc: Do not take addresses of
	functions in namespace std.
	* testsuite/30_threads/thread/id/operators_c++20.cc: New test.

2020-02-19  Patrick Palka  <ppalka@redhat.com>

	* testsuite/std/ranges/adaptors/split.cc (test03): Don't include the
	null terminator of the underlying string as part of the test_range.
	(main): Call test03.

2020-02-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (common_iterator): Add copyable<I>
	requirement (LWG 3385).
	* testsuite/24_iterators/headers/iterator/synopsis_c++20.cc: Adjust
	expected declaration.

	* include/std/ranges (take_while_view, drop_view, drop_while_view)
	(elements_view:_Iterator): Initialize data members (LWG 3364).

	* libsupc++/compare (three_way_comparable): Remove always-false check
	that should have been removed with weak_equality (P1959R0).
	(three_way_comparable_with): Likewise. Reorder requirements (LWG 3360).

	* include/std/concepts (__detail::__partially_ordered_with): Move here
	from <compare>.
	(totally_ordered, totally_ordered_with): Use __partially_ordered_with
	to simplify definition (LWG 3331).
	* libsupc++/compare (__detail::__partially_ordered_with): Move to
	<concepts>.

	* include/std/concepts (totally_ordered_with): Remove redundant
	requirement (LWG 3329).

	* include/std/ranges (__detail::__convertible_to_non_slicing): New
	helper concept.
	(__detail::__pair_like_convertible_to): Remove.
	(__detail::__pair_like_convertible_from): Add requirements for
	non-slicing conversions.
	(subrange): Constrain constructors with __convertible_to_non_slicing.
	Remove constructors from pair-like types. Add new deduction guide.
	* testsuite/std/ranges/subrange/lwg3282_neg.cc: New test.

	* include/bits/iterator_concepts.h (iter_move): Add declaration to
	prevent unqualified lookup finding a suitable declaration (LWG 3247).

	* include/std/memory_resource (polymorphic_allocator::allocate)
	(polymorphic_allocator::allocate_object): Change type of exception to
	bad_array_new_length (LWG 3237).
	* testsuite/20_util/polymorphic_allocator/lwg3237.cc: New test.

	* include/std/type_traits (__cpp_lib_unwrap_ref): Define (LWG 3348).
	* include/std/version (__cpp_lib_unwrap_ref): Likewise.
	* testsuite/20_util/unwrap_reference/1.cc: Check macro.
	* testsuite/20_util/unwrap_reference/3.cc: New test.

	* include/std/numeric (midpoint(T8, T*)): Do not check for complete
	type during overload resolution, use static assert instead (LWG 3200).
	* testsuite/26_numerics/midpoint/pointer.cc: Do not test with
	incomplete type.
	* testsuite/26_numerics/midpoint/pointer_neg.cc: New test.

	* include/std/span (span(T (&)[N])): Use non-deduced context to
	prevent first parameter from interfering with class template argument
	deduction (LWG 3369).
	* testsuite/23_containers/span/deduction.cc: Add missing 'const'.
	* testsuite/23_containers/span/lwg3255.cc: Check for construction from
	rvalues.

	* include/std/span (span::const_iterator, span::const_reverse_iterator)
	(span::cbegin(), span::cend(), span::crbegin(), span::crend()):
	Remove (LWG 3320).
	* testsuite/23_containers/span/everything.cc: Replace uses of cbegin
	and cend.
	* testsuite/20_util/specialized_algorithms/destroy/constrained.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_copy/
	constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/
	uninitialized_default_construct/constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_fill/
	constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_move/
	constrained.cc: Likewise.
	* testsuite/20_util/specialized_algorithms/
	uninitialized_value_construct/constrained.cc: Likewise.

	* include/bits/range_access.h (range_size_t): Define alias template.
	* include/std/ranges (all_view): Rename to views::all_t (LWG 3335).
	* testsuite/std/ranges/adaptors/filter.cc: Adjust to new name.

	* include/std/ranges (filter_view, transform_view, take_view)
	(join_view, split_view, reverse_view): Remove commented-out converting
	constructors (LWG 3280).

	* include/std/memory (uninitialized_construct_using_allocator): Use
	std::construct_at (LWG 3321).

	* include/std/memory_resource (polymorphic_allocator::allocate_bytes)
	(polymorphic_allocator::allocate_object)
	(polymorphic_allocator::new_object): Add nodiscard attribute (LWG3304).

	LWG 3379. "safe" in several library names is misleading
	* include/bits/range_access.h (enable_safe_range): Rename to
	enable_borrowed_range.
	(__detail::__maybe_safe_range): Rename to __maybe_borrowed_range.
	(safe_range): Rename to borrowed_range.
	* include/bits/ranges_algo.h: Adjust to use new names.
	* include/bits/ranges_algobase.h: Likewise.
	* include/bits/ranges_uninitialized.h: Likewise.
	* include/std/ranges: Likewise.
	(safe_iterator_t): Rename to borrowed_iterator_t.
	(safe_subrange_t): Rename to borrowed_subrange_t.
	* include/std/span: Adjust to use new names.
	* include/std/string_view: Likewise.
	* include/experimental/string_view: Likewise.
	* testsuite/std/ranges/access/begin.cc: Likewise.
	* testsuite/std/ranges/access/cbegin.cc: Likewise.
	* testsuite/std/ranges/access/cdata.cc: Likewise.
	* testsuite/std/ranges/access/cend.cc: Likewise.
	* testsuite/std/ranges/access/crbegin.cc: Likewise.
	* testsuite/std/ranges/access/crend.cc: Likewise.
	* testsuite/std/ranges/access/data.cc: Likewise.
	* testsuite/std/ranges/access/end.cc: Likewise.
	* testsuite/std/ranges/access/rbegin.cc: Likewise.
	* testsuite/std/ranges/access/rend.cc: Likewise.
	* testsuite/std/ranges/safe_range.cc: Likewise.
	* testsuite/std/ranges/safe_range_types.cc: Likewise.
	* testsuite/util/testsuite_iterators.h: Likewise.

	* include/std/ranges (tuple_element<0, const subrange<I, S, K>>)
	(tuple_element<1, const subrange<I, S, K>>): Add partial
	specializations (LWG 3398).
	* testsuite/std/ranges/subrange/tuple_like.cc: New test.

	* include/bits/ranges_algo.h (__find_fn, __find_first_of_fn)
	(__adjacent_find_fn, __remove_if_fn, __remove_copy_if_fn)
	(__unique_fn, __unique_copy_fn): Remove redundant conversions to bool.

2020-02-18  Patrick Palka  <ppalka@redhat.com>

	P1983R0 Wording for GB301, US296, US292, US291, and US283
	* include/std/ranges (filter_view::pred): New member function.
	(join_view::_Iterator::_Iterator): Remove now-redundant comment since
	P1983R0 fixes the highlighted issue in the same way.
	(join_view::_Iterator<_Const>): Add friend
	join_view::_Iterator<!_Const>.
	(join_view::_M_inner): Remove mutable specifier, effectively reverting
	the proposed wording changes of P3278.
	(join_view::begin): Refine the condition for when to return a const
	iterator.
	(split_view::_OuterIter::_OuterIter): Adjust constraints.
	* testsuite/std/ranges/adaptors/filter.cc: Test that filter_view::pred
	exists and works.

2020-02-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93818
	* include/std/ranges (_RangeAdaptor): Add deduction guide.
	(filter_view::_Iterator): Add alias _Vp_iter and use in place of
	iterator_t<_Vp>.
	(filter_view::_Iterator::_S_iter_cat()): Add 'typename'.
	(transform_view::_Iterator): Add alias _Base_iter and use in place of
	iterator_t<_Base>.
	(transform_view::_Iterator::_S_iter_cat()): Add 'typename'.
	(join_view::_Iterator): Add _Outer_iter and _Inner_iter aliases.
	(join_view::_Iterator::_S_iter_cat()): Add 'typename'.
	(split_view::_InnerIter::_S_iter_cat()): Likewise.

	* testsuite/20_util/integer_comparisons/equal.cc: Fix invalid
	assumption that long is wider than int.
	* testsuite/20_util/integer_comparisons/greater_equal.cc: Likewise.
	* testsuite/20_util/integer_comparisons/less.cc: Likewise.
	* testsuite/20_util/integer_comparisons/less_equal.cc: Likewise.
	* testsuite/20_util/integer_comparisons/not_equal.cc: Likewise.

	P1976R2 Fixed-size span construction from dynamic range
	* include/std/span (__cpp_lib_span): Update value.
	(span(It, size_type), span(It, End)): Make conditionally explicit. Add
	assertion.
	(span(R&&), span(const span<OType, OExtent>&)): Likewise and relax
	constraints.
	(span::first<Count>(), span::last<Count>()): Use explicit type in
	return statement.
	(as_bytes, as_writable_bytes): Likewise.
	* include/std/version (__cpp_lib_span): Update value.
	* testsuite/23_containers/span/1.cc: Check new value.
	* testsuite/23_containers/span/2.cc: Check new value.
	* testsuite/23_containers/span/explicit.cc: New test.

	* include/std/span (span::__is_compatible_array): Simplify alias
	template by using requires-clause.
	(span::__is_compatible_ref): New alias template for constraining
	constructors.
	(span::__is_compatible_iterator, span::__is_compatible_range): Remove.
	(span(It, size_type), span(It, End)): Use __is_compatible_ref.
	(span(T(&)[N], span(array<T, N>&), span(const array<T, N>&)): Remove
	redundant parentheses.
	(span(R&&)): Add missing constraints.

	* include/std/span (span): Reorder members and rename template
	parameters to match declarations in the C++2a working paper.

	P2116R0 Remove tuple-like protocol support from fixed-extent span
	* include/std/span (get, tuple_size, tuple_element): Remove.
	* testsuite/23_containers/span/everything.cc: Remove checks for
	tuple-like API.
	* testsuite/23_containers/span/get_neg.cc: Remove.
	* testsuite/23_containers/span/tuple_element_dynamic_neg.cc: Remove.
	* testsuite/23_containers/span/tuple_element_oob_neg.cc: Remove.
	* testsuite/23_containers/span/tuple_size_neg.cc: Remove.

2020-02-17  Patrick Palka  <ppalka@redhat.com>

	P2106R0 Alternative wording for GB315 and GB316
	* include/bits/ranges_algo.h (in_fun_result): New.
	(for_each_result, for_each_n_result): Change into an alias of
	in_fun_result.
	(in_in_result): New.
	(mismatch_result): Change into an alias of in_in_result.
	(copy_if_result): Change into an alias of in_out_result.
	(swap_ranges_result): Change into an alias of in_in_result.
	(unary_transform_result): Change into an alias of in_out_result.
	(in_in_out_result): New.
	(binary_transform_result): Change into an alias of in_in_out_result.
	(replace_copy_result, replace_copy_if_result, remove_copy_if_result,
	remove_copy_result, unique_copy_result, reverse_copy_result,
	rotate_copy_result, partial_sort_copy_result): Change into an alias of
	in_out_result.
	(in_out_out_result): New.
	(partition_copy_result, merge_result): Change into an alias of
	in_out_out_result.
	(set_union_result, set_intersection_result): Change into an alias of
	in_in_out_result.
	(set_difference_result): Change into an alias of in_out_result.
	(set_symmetric_difference): Change into an alias of in_in_out_result.
	(min_max_result): New.
	(minmax_result, minmax_element_result): Change into an alias of
	min_max_result.
	(in_found_result): New.
	(next_permutation_result, prev_permutation_result): Change into an alias
	of in_found_result.
	(__next_permutation_fn::operator(), __prev_permutation_fn::operator()):
	Adjust following changes to next_permutation_result and
	prev_permutation_result.
	* include/bits/ranges_algobase.h (in_out_result): New.
	(copy_result, move_result, move_backward_result, copy_backward_result,
	copy_n_result): Change into an alias of in_out_result.
	* include/bits/ranges_uninitialized.h (uninitialized_copy_result,
	uninitialized_copy_n_result, uninitialized_move_result,
	uninitialized_move_n_result): Likewise.
	* testsuite/25_algorithms/next_permutation/constrained.cc: Adjust uses of
	structured bindings.
	* testsuite/25_algorithms/prev_permutation/constrained.cc: Likewise.

	P1243R4 Rangify new algorithms
	* include/bits/ranges_algo.h (for_each_n_result, __for_each_n_fn,
	for_each_n, __sample_fn, sample, __clamp_fn, clamp): New.
	* testsuite/25_algorithms/clamp/constrained.cc: New test.
	* testsuite/25_algorithms/for_each/constrained.cc: Augment test.
	* testsuite/25_algorithms/sample/constrained.cc: New test.

2020-02-17  Jonathan Wakely  <jwakely@redhat.com>

	P1964R2 Wording for boolean-testable
	* include/bits/ranges_algo.h (__find_fn, __find_first_of_fn)
	(__adjacent_find_fn): Cast result of predicate to bool.
	* include/std/concepts (__boolean): Remove.
	(__detail::__boolean_testable_impl, __detail::__boolean_testable): Add
	new helper concepts.
	(__detail::__weakly_eq_cmp_with, totally_ordered, totally_ordered_with)
	(predicate): Use __boolean_testable instead of boolean.
	* libsupc++/compare (__detail::__partially_ordered, _Synth3way):
	Likewise.

	P1970R2 Consistency for size() functions: Add ranges::ssize
	* include/bits/range_access.h (_SSize, ssize): Define for C++20.
	* testsuite/std/ranges/access/ssize.cc: New test.

	P1956R1 On the names of low-level bit manipulation functions
	* include/bits/hashtable_policy.h: Update comment.
	* include/std/bit (__ispow2, __ceil2, __floor2, __log2p1): Rename.
	(ispow2, ceil2, floor2, log2p1): Likewise.
	(__cpp_lib_int_pow2): Add feature test macro.
	* include/std/charconv (__to_chars_len_2): Adjust use of __log2p1.
	* include/std/memory (assume_aligned): Adjust use of ispow2.
	* include/std/version (__cpp_lib_int_pow2): Add.
	* libsupc++/new_opa.cc: Adjust use of __ispow2.
	* src/c++17/memory_resource.cc: Likewise, and for __ceil2 and __log2p1.
	* testsuite/17_intro/freestanding.cc: Adjust use of ispow2.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_ceil.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_ceil_neg.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_floor.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/bit_width.cc: ... here.
	* testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Rename to ...
	* testsuite/26_numerics/bit/bit.pow.two/has_single_bit.cc: ... here.

	* include/std/charconv: Add comment.

	PR libstdc++/92546 (partial)
	* include/bits/random.h (uniform_random_bit_generator): Move definition
	to <bits/uniform_int_dist.h>.
	* include/bits/ranges_algo.h: Include <bits/uniform_int_dist.h> instead
	of <bits/random.h>.
	* include/bits/ranges_algobase.h: Do not include <cmath>.
	* include/bits/uniform_int_dist.h (uniform_random_bit_generator):
	Move here.
	* include/std/ranges: Do not include <limits>.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error lineno.

	PR libstdc++/92546 (partial)
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/bits/int_limits.h: New header.
	* include/bits/parse_numbers.h (__select_int::_Select_int): Replace
	numeric_limits with __detail::__int_limits.
	* include/std/bit (__rotl, __rotr, __countl_zero, __countl_one)
	(__countr_zero, __countr_one, __popcount, __ceil2, __floor2, __log2p1):
	Likewise.
	* include/std/charconv (__to_chars_8, __from_chars_binary)
	(__from_chars_alpha_to_num, from_chars): Likewise.
	* include/std/memory_resource (polymorphic_allocator::allocate)
	(polymorphic_allocator::allocate_object): Likewise.
	* include/std/string_view (basic_string_view::_S_compare): Likewise.
	* include/std/utility (in_range): Likewise.
	* testsuite/20_util/integer_comparisons/in_range_neg.cc: Adjust for
	extra error about incomplete type __int_limits<bool>.
	* testsuite/26_numerics/bit/bit.count/countl_one.cc: Include <limits>.
	* testsuite/26_numerics/bit/bit.count/countl_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bit.count/countr_one.cc: Likewise.
	* testsuite/26_numerics/bit/bit.count/countr_zero.cc: Likewise.
	* testsuite/26_numerics/bit/bit.count/popcount.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2_neg.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/ceil2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/floor2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/ispow2.cc: Likewise.
	* testsuite/26_numerics/bit/bit.pow.two/log2p1.cc: Likewise.
	* testsuite/26_numerics/bit/bit.rotate/rotl.cc: Likewise.
	* testsuite/26_numerics/bit/bit.rotate/rotr.cc: Likewise.

	* python/libstdcxx/v6/printers.py (StdCmpCatPrinter.to_string): Update
	value for partial_ordering::unordered.

	* include/bits/iterator_concepts.h (indirectly_copyable_storable): Add
	const-qualified expression variations.
	* include/std/concepts (copyable): Likewise.

	* include/std/type_traits (__is_standard_integer): New helper trait.
	* include/std/utility (cmp_equal, cmp_not_equal, cmp_less, cmp_greater)
	(cmp_less_equal, cmp_greater_equal, in_range): Define for C++20.
	* include/std/version (__cpp_lib_integer_comparison_functions): Define.
	* testsuite/20_util/integer_comparisons/1.cc: New test.
	* testsuite/20_util/integer_comparisons/2.cc: New test.
	* testsuite/20_util/integer_comparisons/equal.cc: New test.
	* testsuite/20_util/integer_comparisons/equal_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/greater_equal.cc: New test.
	* testsuite/20_util/integer_comparisons/greater_equal_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/greater_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/in_range.cc: New test.
	* testsuite/20_util/integer_comparisons/in_range_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/less.cc: New test.
	* testsuite/20_util/integer_comparisons/less_equal.cc: New test.
	* testsuite/20_util/integer_comparisons/less_equal_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/less_neg.cc: New test.
	* testsuite/20_util/integer_comparisons/not_equal.cc: New test.
	* testsuite/20_util/integer_comparisons/not_equal_neg.cc: New test.

2020-02-16  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_algo.h (__lexicographical_compare_fn::operator()):
	Move code after an early exit constexpr if to under an else branch.
	* include/bits/ranges_algobase.h (__equal_fn::operator()): Likewise.

2020-02-15  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_algo.h: Adjust whitespace and formatting.
	* include/bits/ranges_algobase.h: Likewise.
	* include/bits/ranges_uninitialized.h: Likewise.

	* include/bits/ranges_algo.h: (adjacent_find, all_of, any_of,
	binary_search, copy_if, count, count_if, equal_range, find, find_end,
	find_first_of, find_if, find_if_not, for_each, generate, generate_n,
	includes, inplace_merge, is_heap, is_heap_until, is_partitioned,
	is_permutation, is_sorted, is_sorted_until, lexicographical_compare,
	lower_bound, make_heap, max, max_element, merge, min, min_element,
	minmax, minmax_element, mismatch, next_permutation, none_of,
	nth_element, partial_sort, partial_sort_copy, partition, partition_copy,
	partition_point, pop_heap, prev_permutation, push_heap, remove,
	remove_copy, remove_copy_if, remove_if, replace, replace_copy,
	replace_copy_if, replace_if, reverse, reverse_copy, rotate, rotate_copy,
	search, search_n, set_difference, set_intersection,
	set_symmetric_difference, set_union, shuffle, sort, sort_heap,
	stable_partition, stable_sort, swap_ranges, transform, unique,
	unique_copy, upper_bound): Convert into function objects.
	* include/bits/ranges_algobase.h: (equal, copy, move, copy_n, fill_n,
	fill, move_backward, copy_backward): Likewise.
	* include/bits/ranges_uninitialized.h (uninitialized_default_construct,
	uninitialized_default_construct_n, uninitialized_value_construct,
	uninitialized_value_construct_n, uninitialized_copy,
	uninitialized_copy_n, uninitialized_move, uninitialized_move_n,
	uninitialized_fill, uninitialized_fill_n, construct_at, destroy_at,
	destroy, destroy_n): Likewise.

	* include/bits/ranges_algo.h (ranges::__find_end): Fold into ...
	(ranges::find_end): ... here.
	(ranges::__lexicographical_compare): Fold into ...
	(ranges::lexicographical_compare): ... here.
	* include/bits/ranges_algobase.h (ranges::__equal): Fold into ...
	(ranges::equal): ... here.

2020-02-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/erase_if.h (__cpp_lib_erase_if): Define to 202002L.
	* include/std/deque: Likewise.
	* include/std/forward_list: Likewise.
	* include/std/list: Likewise.
	* include/std/string: Likewise.
	* include/std/vector: Likewise.
	* include/std/version: Likewise.
	* testsuite/23_containers/deque/erasure.cc: Test for new value.
	* testsuite/23_containers/forward_list/erasure.cc: Likewise.
	* testsuite/23_containers/list/erasure.cc: Likewise.
	* testsuite/23_containers/map/erasure.cc: Likewise.
	* testsuite/23_containers/set/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_map/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_set/erasure.cc: Likewise.
	* testsuite/23_containers/vector/erasure.cc: Likewise.

2020-02-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (uniform_random_bit_generator): Require min()
	and max() to be constant expressions and min() to be less than max().
	* testsuite/26_numerics/random/concept.cc: Check additional cases.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error lineno.

2020-02-13  Patrick Palka  <ppalka@redhat.com>

	* include/Makefile.am: Add <bits/ranges_uninitialized.h>.
	* include/Makefile.in: Regenerate.
	* include/bits/ranges_uninitialized.h: New header.
	* include/std/memory: Include it.
	* testsuite/20_util/specialized_algorithms/destroy/constrained.cc: New
	test.
	* .../uninitialized_copy/constrained.cc: New test.
	* .../uninitialized_default_construct/constrained.cc: New test.
	* .../uninitialized_fill/constrained.cc: New test.
	* .../uninitialized_move/constrained.cc: New test.
	* .../uninitialized_value_construct/constrained.cc: New test.

	* include/Makefile.am: Add bits/ranges_algobase.h
	* include/Makefile.in: Regenerate.
	* bits/ranges_algo.h: Include <bits/ranges_algobase.h> and refactor
	existing #includes.
	(__detail::__is_normal_iterator, __detail::is_reverse_iterator,
	__detail::__is_move_iterator, copy_result, move_result,
	__equal, equal, copy_result, move_result, move_backward_result,
	copy_backward_result, __copy_or_move_backward, __copy_or_move, copy,
	move, copy_backward, move_backward, copy_n_result, copy_n, fill_n,
	fill): Split out into ...
	* bits/range_algobase.h: ... this new header.

2020-02-12  Patrick Palka  <ppalka@redhat.com>

	LWG 3389 and LWG 3390
	* include/bits/stl_iterator.h (move_move_iterator): Use std::move when
	constructing the move_iterator with __i.
	(counted_iterator::counted_iterator): Use std::move when initializing
	M_current with __i.
	* testsuite/24_iterators/counted_iterator/lwg3389.cc: New test.
	* testsuite/24_iterators/move_iterator/lwg3390.cc: New test.

2020-02-12  Sandra Loosemore  <sandra@codesourcery.com>

	PR libstdc++/79193
	PR libstdc++/88999

	* configure: Regenerated.

2020-02-12  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable.h
	(_Hashtable<>(_Hashtable&&, std::allocator_type&)): Add
	missing std namespace qualification to forward call.

2020-02-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/function_objects/range.cmp/equal_to.cc: Fix
	comment.
	* testsuite/20_util/function_objects/range.cmp/less.ccL Likewise.

	* include/std/ranges: Fix non-ASCII characters in comment.

	* include/bits/range_cmp.h (__detail::__eq_builtin_ptr_cmp): Require
	equality comparison to be valid and return bool.
	(__detail::__less_builtin_ptr_cmp): Likewise for less-than comparison.
	* testsuite/20_util/function_objects/range.cmp/equal_to.cc: Check
	type with ambiguous conversion to fundamental types.
	* testsuite/20_util/function_objects/range.cmp/less.cc: Likewise.

2020-02-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (iter_difference_t, iter_value_t):
	Use remove_cvref_t.
	(readable_traits): Rename to indirectly_readable_traits.
	(readable): Rename to indirectly_readable.
	(writable): Rename to indirectly_writable.
	(__detail::__iter_exchange_move): Do not use remove_reference_t.
	(indirectly_swappable): Adjust requires expression parameter types.
	expression.
	* include/bits/ranges_algo.h (ranges::transform, ranges::replace)
	(ranges::replace_if, ranges::generate_n, ranges::generate)
	(ranges::remove): Use new name for writable.
	* include/bits/stl_iterator.h (__detail::__common_iter_has_arrow):
	Use new name for readable.
	* include/ext/pointer.h (readable_traits<_Pointer_adapter<P>>): Use
	new name for readable_traits.
	* testsuite/24_iterators/associated_types/readable.traits.cc: Likewise.
	* testsuite/24_iterators/indirect_callable/projected.cc: Adjust for
	new definition of indirectly_readable.

	* include/bits/stl_iterator.h (__detail::__common_iter_ptr): Change
	to take parameters of common_iterator, instead of the common_iterator
	type itself. Fix argument for __common_iter_has_arrow constraint.
	(iterator_traits<common_iterator<I, S>>::pointer): Adjust.

2020-02-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (iota_view): Add braces to prevent -Wempty-body
	warning.
	(basic_istream_view::_Iterator::operator++()): Add missing return.

2020-02-07  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_algo.h: Remove extraneous &&.

	* include/std/ranges (ranges::__detail::__stream_extractable,
	ranges::basic_istream_view, ranges::istream_view): Define.
	* testsuite/std/ranges/istream_view: New test.

	Implement C++20 range adaptors
	* include/std/ranges: Include <bits/refwrap.h> and <tuple>.
	(subrange::_S_store_size): Mark as const instead of constexpr to
	avoid what seems to be a bug in GCC.
	(__detail::__box): Give it defaulted copy and move constructors.
	(ranges::views::_Single::operator()): Mark constexpr.
	(ranges::views::_Iota::operator()): Mark constexpr.
	(__detail::Empty): Define.
	(ranges::views::__closure::_RangeAdaptor,
	ranges::views::__closure::_RangeAdaptorClosure, ref_view, all_view,
	ranges::views::all, ranges::__detail::find_if,
	ranges::__detail::find_if_not, ranges::__detail::mismatch,
	ranges::detail::min, filter_view, ranges::views::filter, transform_view,
	ranges::views::transform, take_view, ranges::views::take,
	take_while_view, ranges::views::take_while, drop_view,
	ranges::views::drop, join_view, ranges::views::join,
	__detail::require_constant, __detail::tiny_range, split_view,
	ranges::views::split, ranges::views::_Counted, ranges::views::counted,
	common_view, ranges::views::common, reverse_view,
	ranges::views::reverse,
	ranges::views::__detail::__is_reversible_subrange,
	ranges::views::__detail::__is_reverse_view, reverse_view,
	ranges::views::reverse, __detail::__has_tuple_element, elements_view,
	ranges::views::elements, ranges::views::keys, ranges::views::values):
	Define.
	(views): Alias for ranges::views.
	(tuple_size<ranges::subrange<>>, tuple_element<0, ranges::subrange>,
	tuple_element<1, ranges::subrange>): New partial specializations.
	* testsuite/std/ranges/adaptors/all.cc: New test.
	* testsuite/std/ranges/adaptors/common.cc: Likewise.
	* testsuite/std/ranges/adaptors/counted.cc: Likewise.
	* testsuite/std/ranges/adaptors/drop.cc: Likewise.
	* testsuite/std/ranges/adaptors/drop_while.cc: Likewise.
	* testsuite/std/ranges/adaptors/elements.cc: Likewise.
	* testsuite/std/ranges/adaptors/filter.cc: Likewise.
	* testsuite/std/ranges/adaptors/join.cc: Likewise.
	* testsuite/std/ranges/adaptors/reverse.cc: Likewise.
	* testsuite/std/ranges/adaptors/split.cc: Likewise.
	* testsuite/std/ranges/adaptors/take.cc: Likewise.
	* testsuite/std/ranges/adaptors/take_while.cc: Likewise.
	* testsuite/std/ranges/adaptors/transform.cc: Likewise.

2020-02-07  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (__cmp_cat::type): Define typedef for underlying
	type of enumerations and comparison category types.
	(__cmp_cat::_Ord, __cmp_cat::_Ncmp): Add underlying type.
	(__cmp_cat::_Ncmp::unordered): Change value to 2.
	(partial_ordering::_M_value, weak_ordering::_M_value)
	(strong_ordering::_M_value): Change type to __cmp_cat::type.
	(partial_ordering::_M_is_ordered): Remove data member.
	(partial_ordering): Use second bit of _M_value for unordered. Adjust
	comparison operators.
	(weak_ordering::operator partial_ordering): Simplify to remove
	branches.
	(operator<=>(unspecified, weak_ordering)): Likewise.
	(strong_ordering::operator partial_ordering): Likewise.
	(strong_ordering::operator weak_ordering): Likewise.
	(operator<=>(unspecified, strong_ordering)): Likewise.
	* testsuite/18_support/comparisons/categories/partialord.cc: New test.
	* testsuite/18_support/comparisons/categories/strongord.cc: New test.
	* testsuite/18_support/comparisons/categories/weakord.cc: New test.

	* include/std/ranges (iota_view::_Iterator): Fix typo in name of
	__cpp_lib_three_way_comparison macro and use deduced return type for
	operator<=>.
	* testsuite/std/ranges/iota/iterator.cc: New test.

2020-02-07  Patrick Palka  <ppalka@redhat.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	Implement C++20 constrained algorithms
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/std/algorithm: Include <bits/ranges_algo.h>.
	* include/bits/ranges_algo.h: New file.
	* testsuite/25_algorithms/adjacent_find/constrained.cc: New test.
	* testsuite/25_algorithms/all_of/constrained.cc: New test.
	* testsuite/25_algorithms/any_of/constrained.cc: New test.
	* testsuite/25_algorithms/binary_search/constrained.cc: New test.
	* testsuite/25_algorithms/copy/constrained.cc: New test.
	* testsuite/25_algorithms/copy_backward/constrained.cc: New test.
	* testsuite/25_algorithms/copy_if/constrained.cc: New test.
	* testsuite/25_algorithms/copy_n/constrained.cc: New test.
	* testsuite/25_algorithms/count/constrained.cc: New test.
	* testsuite/25_algorithms/count_if/constrained.cc: New test.
	* testsuite/25_algorithms/equal/constrained.cc: New test.
	* testsuite/25_algorithms/equal_range/constrained.cc: New test.
	* testsuite/25_algorithms/fill/constrained.cc: New test.
	* testsuite/25_algorithms/fill_n/constrained.cc: New test.
	* testsuite/25_algorithms/find/constrained.cc: New test.
	* testsuite/25_algorithms/find_end/constrained.cc: New test.
	* testsuite/25_algorithms/find_first_of/constrained.cc: New test.
	* testsuite/25_algorithms/find_if/constrained.cc: New test.
	* testsuite/25_algorithms/find_if_not/constrained.cc: New test.
	* testsuite/25_algorithms/for_each/constrained.cc: New test.
	* testsuite/25_algorithms/generate/constrained.cc: New test.
	* testsuite/25_algorithms/generate_n/constrained.cc: New test.
	* testsuite/25_algorithms/heap/constrained.cc: New test.
	* testsuite/25_algorithms/includes/constrained.cc: New test.
	* testsuite/25_algorithms/inplace_merge/constrained.cc: New test.
	* testsuite/25_algorithms/is_partitioned/constrained.cc: New test.
	* testsuite/25_algorithms/is_permutation/constrained.cc: New test.
	* testsuite/25_algorithms/is_sorted/constrained.cc: New test.
	* testsuite/25_algorithms/is_sorted_until/constrained.cc: New test.
	* testsuite/25_algorithms/lexicographical_compare/constrained.cc: New
	test.
	* testsuite/25_algorithms/lower_bound/constrained.cc: New test.
	* testsuite/25_algorithms/max/constrained.cc: New test.
	* testsuite/25_algorithms/max_element/constrained.cc: New test.
	* testsuite/25_algorithms/merge/constrained.cc: New test.
	* testsuite/25_algorithms/min/constrained.cc: New test.
	* testsuite/25_algorithms/min_element/constrained.cc: New test.
	* testsuite/25_algorithms/minmax/constrained.cc: New test.
	* testsuite/25_algorithms/minmax_element/constrained.cc: New test.
	* testsuite/25_algorithms/mismatch/constrained.cc: New test.
	* testsuite/25_algorithms/move/constrained.cc: New test.
	* testsuite/25_algorithms/move_backward/constrained.cc: New test.
	* testsuite/25_algorithms/next_permutation/constrained.cc: New test.
	* testsuite/25_algorithms/none_of/constrained.cc: New test.
	* testsuite/25_algorithms/nth_element/constrained.cc: New test.
	* testsuite/25_algorithms/partial_sort/constrained.cc: New test.
	* testsuite/25_algorithms/partial_sort_copy/constrained.cc: New test.
	* testsuite/25_algorithms/partition/constrained.cc: New test.
	* testsuite/25_algorithms/partition_copy/constrained.cc: New test.
	* testsuite/25_algorithms/partition_point/constrained.cc: New test.
	* testsuite/25_algorithms/prev_permutation/constrained.cc: New test.
	* testsuite/25_algorithms/remove/constrained.cc: New test.
	* testsuite/25_algorithms/remove_copy/constrained.cc: New test.
	* testsuite/25_algorithms/remove_copy_if/constrained.cc: New test.
	* testsuite/25_algorithms/remove_if/constrained.cc: New test.
	* testsuite/25_algorithms/replace/constrained.cc: New test.
	* testsuite/25_algorithms/replace_copy/constrained.cc: New test.
	* testsuite/25_algorithms/replace_copy_if/constrained.cc: New test.
	* testsuite/25_algorithms/replace_if/constrained.cc: New test.
	* testsuite/25_algorithms/reverse/constrained.cc: New test.
	* testsuite/25_algorithms/reverse_copy/constrained.cc: New test.
	* testsuite/25_algorithms/rotate/constrained.cc: New test.
	* testsuite/25_algorithms/rotate_copy/constrained.cc: New test.
	* testsuite/25_algorithms/search/constrained.cc: New test.
	* testsuite/25_algorithms/search_n/constrained.cc: New test.
	* testsuite/25_algorithms/set_difference/constrained.cc: New test.
	* testsuite/25_algorithms/set_intersection/constrained.cc: New test.
	* testsuite/25_algorithms/set_symmetric_difference/constrained.cc: New
	test.
	* testsuite/25_algorithms/set_union/constrained.cc: New test.
	* testsuite/25_algorithms/shuffle/constrained.cc: New test.
	* testsuite/25_algorithms/sort/constrained.cc: New test.
	* testsuite/25_algorithms/stable_partition/constrained.cc: New test.
	* testsuite/25_algorithms/stable_sort/constrained.cc: New test.
	* testsuite/25_algorithms/swap_ranges/constrained.cc: New test.
	* testsuite/25_algorithms/transform/constrained.cc: New test.
	* testsuite/25_algorithms/unique/constrained.cc: New test.
	* testsuite/25_algorithms/unique_copy/constrained.cc: New test.
	* testsuite/25_algorithms/upper_bound/constrained.cc: New test.

2020-02-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (__detail::__common_iter_ptr): Fix PR
	number in comment. Fix indentation.

	* include/bits/stl_algobase.h (__iter_swap, __iter_swap<true>): Remove
	redundant _GLIBCXX20_CONSTEXPR.

	* include/std/ranges (viewable_range): Replace decay_t with
	remove_cvref_t (LWG 3375).

2020-02-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (iter_reference_t)
	(iter_rvalue_reference_t, iter_common_reference_t, indirect_result_t):
	Remove workarounds for PR c++/67704.
	* testsuite/24_iterators/aliases.cc: New test.

2020-02-05  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_iterator.h (move_iterator::move_iterator): Move __i
	when initializing _M_current.
	(move_iterator::base): Split into two overloads differing in
	ref-qualifiers as in P1207R4 for C++20.

2020-02-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/functional (_GLIBCXX_NOT_FN_CALL_OP): Un-define after
	use.

	PR libstdc++/93562
	* include/bits/unique_ptr.h (__uniq_ptr_impl::swap): Define.
	(unique_ptr::swap, unique_ptr<T[], D>::swap): Call it.
	* testsuite/20_util/unique_ptr/modifiers/93562.cc: New test.

2020-02-01  Andrew Burgess  <andrew.burgess@embecosm.com>

	* configure: Regenerate.

2020-01-31  Patrick Palka  <ppalka@redhat.com>

	* testsuite/24_iterators/range_operations/distance.cc: Do not assume
	test_range::end() returns the same type as test_range::begin().
	* testsuite/24_iterators/range_operations/next.cc: Likewise.
	* testsuite/24_iterators/range_operations/prev.cc: Likewise.
	* testsuite/util/testsuite_iterators.h (__gnu_test::test_range::end):
	Always return a sentinel<I>.

2020-01-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92895
	* include/std/stop_token (stop_token::stop_possible()): Call new
	_M_stop_possible() function.
	(stop_token::stop_requested()): Do not use stop_possible().
	(stop_token::binary_semaphore): New class, as temporary stand-in for
	std::binary_semaphore.
	(stop_token::_Stop_cb::_M_callback): Add noexcept to type.
	(stop_token::_Stop_cb::_M_destroyed, stop_token::_Stop_cb::_M_done):
	New data members for symchronization with stop_callback destruction.
	(stop_token::_Stop_cb::_Stop_cb): Make non-template.
	(stop_token::_Stop_cb::_M_linked, stop_token::_Stop_cb::_S_execute):
	Remove.
	(stop_token::_Stop_cb::_M_run): New member function.
	(stop_token::_Stop_state::_M_stopped, stop_token::_Stop_state::_M_mtx):
	Remove.
	(stop_token::_Stop_state::_M_owners): New data member to track
	reference count for ownership.
	(stop_token::_Stop_state::_M_value): New data member combining a
	spinlock, the stop requested flag, and the reference count for
	associated stop_source objects.
	(stop_token::_Stop_state::_M_requester): New data member for
	synchronization with stop_callback destruction.
	(stop_token::_Stop_state::_M_stop_possible()): New member function.
	(stop_token::_Stop_state::_M_stop_requested()): Inspect relevant bit
	of _M_value.
	(stop_token::_Stop_state::_M_add_owner)
	(stop_token::_Stop_state::_M_release_ownership)
	(stop_token::_Stop_state::_M_add_ssrc)
	(stop_token::_Stop_state::_M_sub_ssrc): New member functions for
	updating reference counts.
	(stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
	(stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
	(stop_token::_Stop_state::_M_try_lock)
	(stop_token::_Stop_state::_M_try_lock_and_stop)
	(stop_token::_Stop_state::_M_do_try_lock): New member functions for
	managing spinlock.
	(stop_token::_Stop_state::_M_request_stop): Use atomic operations to
	read and update state. Release lock while running callbacks. Use new
	data members to synchronize with callback destruction.
	(stop_token::_Stop_state::_M_remove_callback): Likewise.
	(stop_token::_Stop_state::_M_register_callback): Use atomic operations
	to read and update state.
	(stop_token::_Stop_state_ref): Handle type to manage _Stop_state,
	replacing shared_ptr.
	(stop_source::stop_source(const stop_source&)): Update reference count.
	(stop_source::operator=(const stop_source&)): Likewise.
	(stop_source::~stop_source()): Likewise.
	(stop_source::stop_source(stop_source&&)): Define as defaulted.
	(stop_source::operator=(stop_source&&)): Establish postcondition on
	parameter.
	(stop_callback): Enforce preconditions on template parameter. Replace
	base class with data member of new _Cb_impl type.
	(stop_callback::stop_callback(const stop_token&, Cb&&))
	(stop_callback::stop_callback(stop_token&&, Cb&&)): Fix TOCTTOU race.
	(stop_callback::_Cb_impl): New type wrapping _Callback member and
	defining the _S_execute member function.
	* testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc: New
	test.
	* testsuite/30_threads/stop_token/stop_callback/deadlock.cc: New test.
	* testsuite/30_threads/stop_token/stop_callback/destroy.cc: New test.
	* testsuite/30_threads/stop_token/stop_callback/destructible_neg.cc:
	New test.
	* testsuite/30_threads/stop_token/stop_callback/invocable_neg.cc: New
	test.
	* testsuite/30_threads/stop_token/stop_callback/invoke.cc: New test.
	* testsuite/30_threads/stop_token/stop_source/assign.cc: New test.
	* testsuite/30_threads/stop_token/stop_token/stop_possible.cc: New
	test.

	* libsupc++/compare (__detail::__3way_builtin_ptr_cmp): Use
	three_way_comparable_with.
	(__detail::__3way_cmp_with): Remove workaround for fixed bug.
	(compare_three_way::operator()): Remove redundant constraint from
	requires-clause.
	(__detail::_Synth3way::operator()): Use three_way_comparable_with
	instead of workaround.
	* testsuite/18_support/comparisons/object/93479.cc: Prune extra
	output due to simplified constraints on compare_three_way::operator().

	PR libstdc++/93479
	* libsupc++/compare (__3way_builtin_ptr_cmp): Require <=> to be valid.
	* testsuite/18_support/comparisons/object/93479.cc: New test.

	* testsuite/std/ranges/access/end.cc: Do not assume test_range::end()
	returns the same type as test_range::begin(). Add comments.
	* testsuite/std/ranges/access/rbegin.cc: Likewise.
	* testsuite/std/ranges/access/rend.cc: Likewise.
	* testsuite/std/ranges/range.cc: Do not assume the sentinel for
	test_range is the same as its iterator type.
	* testsuite/util/testsuite_iterators.h (test_range::sentinel): Add
	operator- overloads to satisfy sized_sentinel_for when the iterator
	satisfies random_access_iterator.

2020-01-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93470
	* include/bits/refwrap.h (reference_wrapper::operator()): Restrict
	static assertion to object types.

	PR libstdc++/93325
	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Use AC_SEARCH_LIBS for
	clock_gettime instead of explicit glibc version check.
	* configure: Regenerate.

2020-01-28  Martin Liska  <mliska@suse.cz>

	PR libstdc++/93478
	* include/std/atomic: Fix typo.
	* include/std/optional: Likewise.

2020-01-27  Andrew Burgess  <andrew.burgess@embecosm.com>

	* configure: Regenerate.

2020-01-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93426
	* include/std/span (span): Fix deduction guide.
	* testsuite/23_containers/span/deduction.cc: New test.

2020-01-24  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (__cmp_cat::_Eq): Remove enumeration type.
	(__cmp_cat::_Ord::equivalent): Add enumerator.
	(__cmp_cat::_Ord::_Less, __cmp_cat::_Ord::_Greater): Rename to less
	and greater.
	(partial_ordering, weak_ordering, strong_ordering): Remove
	constructors taking __cmp_cat::_Eq parameters. Use renamed
	enumerators.

2020-01-24  Maciej W. Rozycki  <macro@wdc.com>

	* acinclude.m4: Handle `--with-toolexeclibdir='.
	* Makefile.in: Regenerate.
	* aclocal.m4: Regenerate.
	* configure: Regenerate.
	* doc/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

2020-01-23  Alexandre Oliva <oliva@adacore.com>

	* crossconfig.m4 (GLIBCXX_CHECK_MATH_DECL): Reject macros.
	* configure: Rebuild.

	* testsuite/27_io/fpos/mbstate_t/1.cc: Zero-init mbstate_t.

2020-01-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91947
	* include/Makefile.am (${host_builddir}/largefile-config.h): Simplify
	rule.
	* include/Makefile.in: Regenerate.

2020-01-20  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/faq.xml: Fix grammar.
	* doc/xml/manual/appendix_contributing.xml: Improve instructions.
	* doc/xml/manual/spine.xml: Update copyright years.
	* doc/html/*: Regenerate.

2020-01-19  Eric S. Raymond <esr@thyrsus.com>

	* doc/xml/faq.xml: Update for SVN -> Git transition.
	* doc/xml/manual/appendix_contributing.xml: Likewise.
	* doc/xml/manual/status_cxx1998.xml: Likewise.
	* doc/xml/manual/status_cxx2011.xml: Likewise.
	* doc/xml/manual/status_cxx2014.xml: Likewise.
	* doc/xml/manual/status_cxx2017.xml: Likewise.
	* doc/xml/manual/status_cxx2020.xml: Likewise.
	* doc/xml/manual/status_cxxtr1.xml: Likewise.
	* doc/xml/manual/status_cxxtr24733.xml: Likewise.

2020-01-18  Iain Sandoe  <iain@sandoe.co.uk>

	* include/Makefile.am: Add coroutine to the std set.
	* include/Makefile.in: Regenerated.
	* include/std/coroutine: New file.

2020-01-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92376
	* include/bits/c++config: Only do PSTL config when the header is
	present, to fix freestanding.
	* libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Declare allocation
	functions if they were detected by configure.

2020-01-16  Kai-Uwe Eckhardt  <kuehro@gmx.de>
	    Matthew Bauer  <mjbauer95@gmail.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR bootstrap/64271 (partial)
	* config/os/bsd/netbsd/ctype_base.h (ctype_base::mask): Change type
	to unsigned short.
	(ctype_base::alpha, ctype_base::digit, ctype_base::xdigit)
	(ctype_base::print, ctype_base::graph, ctype_base::alnum): Sync
	definitions with NetBSD upstream.
	(ctype_base::blank): Use _CTYPE_BL.
	* config/os/bsd/netbsd/ctype_configure_char.cc (_C_ctype_): Remove
	Declaration.
	(ctype<char>::classic_table): Use _C_ctype_tab_ instead of _C_ctype_.
	(ctype<char>::do_toupper, ctype<char>::do_tolower): Cast char
	parameters to unsigned char.
	* config/os/bsd/netbsd/ctype_inline.h (ctype<char>::is): Likewise.

2020-01-16  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/91263
	* include/bits/hashtable.h (_Hashtable<>): Make _Equality<> friend.
	* include/bits/hashtable_policy.h: Include <bits/stl_algo.h>.
	(_Equality_base): Remove.
	(_Equality<>::_M_equal): Review implementation. Use
	std::is_permutation.
	* testsuite/23_containers/unordered_multiset/operators/1.cc
	(Hash, Equal, test02, test03): New.
	* testsuite/23_containers/unordered_set/operators/1.cc
	(Hash, Equal, test02, test03): New.

2020-01-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93267
	* include/bits/iterator_concepts.h (__max_diff_type, __max_size_type):
	Move here from <bits/range_access.h> and define using __int128 when
	available.
	(__is_integer_like, __is_signed_integer_like): Move here from
	<bits/range_access.h>.
	(weakly_incrementable): Use __is_signed_integer_like.
	* include/bits/range_access.h (__max_diff_type, __max_size_type)
	(__is_integer_like, __is_signed_integer_like): Move to
	<bits/iterator_concepts.h>.
	(__make_unsigned_like_t): Move here from <ranges>.
	* include/std/ranges (__make_unsigned_like_t): Move to
	<bits/range_access.h>.
	(iota_view): Replace using-directive with using-declarations.
	* testsuite/std/ranges/iota/93267.cc: New test.
	* testsuite/std/ranges/iota_view.cc: Move to new 'iota' sub-directory.

2020-01-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93244
	* include/bits/fs_path.h (path::generic_string<C,A>)
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Convert root-dir to forward-slash.
	* testsuite/27_io/filesystem/path/generic/generic_string.cc: Check
	root-dir is converted to forward slash in generic pathname.
	* testsuite/27_io/filesystem/path/generic/utf.cc: New test.
	* testsuite/27_io/filesystem/path/generic/wchar_t.cc: New test.

	PR libstdc++/58605
	* include/bits/atomic_base.h (__cpp_lib_atomic_value_initialization):
	Define.
	(__atomic_flag_base, __atomic_base, __atomic_base<_PTp*>)
	(__atomic_float): Add default member initializer for C++20.
	* include/std/atomic (atomic): Likewise.
	(atomic::atomic()): Remove noexcept-specifier on default constructor.
	* include/std/version (__cpp_lib_atomic_value_initialization): Define.
	* testsuite/29_atomics/atomic/cons/assign_neg.cc: Adjust dg-error line
	number.
	* testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic/cons/value_init.cc: New test.
	* testsuite/29_atomics/atomic_flag/cons/value_init.cc: New test.
	* testsuite/29_atomics/atomic_flag/requirements/trivial.cc: Adjust
	expected result for is_trivially_default_constructible.
	* testsuite/29_atomics/atomic_float/requirements.cc: Likewise.
	* testsuite/29_atomics/atomic_float/value_init.cc: New test.
	* testsuite/29_atomics/atomic_integral/cons/assign_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/value_init.cc
	* testsuite/29_atomics/atomic_integral/requirements/trivial.cc: Adjust
	expected results for is_trivially_default_constructible.
	* testsuite/util/testsuite_common_types.h (has_trivial_dtor): Add
	new test generator.

2020-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_iterators.h: Improve comment.

	* testsuite/25_algorithms/equal/deque_iterators/1.cc: Don't use C++11
	initialization syntax.

	PR libstdc++/92285
	* include/bits/streambuf_iterator.h (istreambuf_iterator): Make type
	of base class independent of __cplusplus value.
	[__cplusplus < 201103L] (istreambuf_iterator::reference): Override the
	type defined in the base class
	* testsuite/24_iterators/istreambuf_iterator/92285.cc: New test.
	* testsuite/24_iterators/istreambuf_iterator/requirements/
	base_classes.cc: Adjust expected base class for C++98.

2020-01-09  Olivier Hainque  <hainque@adacore.com>

	* doc/xml/manual/appendix_contributing.xml: Document _C2
	as a reserved identifier, by VxWorks.
	* include/bits/stl_map.h: Rename _C2 template typenames	as _Cmp2.
	* include/bits/stl_multimap.h: Likewise.

2020-01-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/extptr_allocator.h (_ExtPtr_allocator::operator==)
	(_ExtPtr_allocator::operator!=): Add missing const qualifiers.
	* include/ext/pointer.h (readable_traits<_Pointer_adapter<S>>): Add
	partial specialization to disambiguate the two constrained
	specializations.

	* include/experimental/type_traits (experimental::is_pod_v): Disable
	-Wdeprecated-declarations warnings around reference to std::is_pod.
	* include/std/type_traits (is_pod_v): Likewise.
	* testsuite/18_support/max_align_t/requirements/2.cc: Also check
	is_standard_layout and is_trivial. Do not check is_pod for C++20.
	* testsuite/20_util/is_pod/requirements/explicit_instantiation.cc:
	Add -Wno-deprecated for C++20.
	* testsuite/20_util/is_pod/requirements/typedefs.cc: Likewise.
	* testsuite/20_util/is_pod/value.cc: Likewise.
	* testsuite/experimental/type_traits/value.cc: Likewise.

2020-01-09  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>

	* include/bits/c++config (_GLIBCXX20_DEPRECATED): Add new macro.
	* include/std/type_traits (is_pod, is_pod_v): Deprecate for C++20.
	* testuite/20_util/is_pod/deprecated-2a.cc: New test.

2020-01-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93205
	* include/bits/random.h (operator>>): Check stream operation succeeds.
	* include/bits/random.tcc (operator<<): Remove redundant __ostream_type
	typedefs.
	(operator>>): Remove redundant __istream_type typedefs. Check stream
	operations succeed.
	(__extract_params): New function to fill a vector from a stream.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error line.

	PR libstdc++/93208
	* config/abi/pre/gnu.ver: Add new exports.
	* include/std/memory_resource (memory_resource::~memory_resource()):
	Do not define inline.
	(monotonic_buffer_resource::~monotonic_buffer_resource()): Likewise.
	* src/c++17/memory_resource.cc (memory_resource::~memory_resource()):
	Define.
	(monotonic_buffer_resource::~monotonic_buffer_resource()): Define.
	* testsuite/20_util/monotonic_buffer_resource/93208.cc: New test.

2020-01-09  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/92124
	* include/bits/hashtable.h (_Hashtable<>::__alloc_node_gen_t): New
	template alias.
	(_Hashtable<>::__fwd_value_for): New.
	(_Hashtable<>::_M_assign_elements<>): Remove _NodeGenerator template
	parameter.
	(_Hashtable<>::_M_assign<>): Add _Ht template parameter.
	(_Hashtable<>::operator=(const _Hashtable<>&)): Adapt.
	(_Hashtable<>::_M_move_assign): Adapt. Replace std::move_if_noexcept
	with std::move.
	(_Hashtable<>::_Hashtable(const _Hashtable&)): Adapt.
	(_Hashtable<>::_Hashtable(const _Hashtable&, const allocator_type&)):
	Adapt.
	(_Hashtable<>::_Hashtable(_Hashtable&&, const allocator_type&)):
	Adapt.
	* testsuite/23_containers/unordered_set/92124.cc: New.

2020-01-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93201
	* src/c++17/fs_ops.cc (do_remove_all): New function implementing more
	detailed error reporting for remove_all. Check result of recursive
	call before incrementing iterator.
	(remove_all(const path&), remove_all(const path&, error_code&)): Use
	do_remove_all.
	* src/filesystem/ops.cc (remove_all(const path&, error_code&)): Check
	result of recursive call before incrementing iterator.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Check errors
	are reported correctly.
	* testsuite/experimental/filesystem/operations/remove_all.cc: Likewise.

2020-01-07  Thomas Rodgers  <trodgers@redhat.com>

	* include/std/condition_variable
	(condition_variable_any::wait_on): Rename to match current draft
	standard.
	(condition_variable_any::wait_on_until): Likewise.
	(condition_variable_any::wait_on_for): Likewise.
	* testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc:
	Adjust tests to account for renamed methods.

2020-01-07  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/92124
	* include/bits/stl_tree.h
	(_Rb_tree<>::_M_move_assign(_Rb_tree&, false_type)): Replace
	std::move_if_noexcept by std::move.
	* testsuite/23_containers/map/92124.cc: New.
	* testsuite/23_containers/set/92124.cc: New.

2020-01-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stop_token (stop_token): Remove operator!= (LWG 3254).
	(stop_source): Likewise (LWG 3362).
	* testsuite/30_threads/stop_token/stop_source.cc: Test equality
	comparisons.

	* include/bits/stl_algobase.h (__is_byte_iter, __min_cmp)
	(lexicographical_compare_three_way): Do not depend on
	__cpp_lib_concepts.
	* include/std/version (__cpp_lib_three_way_comparison): Only define
	when __cpp_lib_concepts is defined.
	* libsupc++/compare (__cpp_lib_three_way_comparison): Likewise.

2020-01-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_algobase.h (lexicographical_compare_three_way):
	Only define four-argument overload when __cpp_lib_concepts is defined.

2020-01-01  John David Anglin  <danglin@gcc.gnu.org>

	* config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.

2020-01-01  Jakub Jelinek  <jakub@redhat.com>

	Update copyright years.

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