2022-04-27  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/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/powerpc-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt: Update.

2022-04-27  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (SharedPointerPrinter): Add
	support for atomic<shared_ptr<T>> and atomic<weak_ptr<T>>.
	(StdAtomicPrinter): New printer.
	(build_libstdcxx_dictionary): Register new printer.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Test std::atomic.
	* testsuite/libstdc++-prettyprinters/cxx20.cc: Test atomic smart
	pointers.

2022-04-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_atomic.h (atomic<shared_ptr>): Add
	constructor for constant initialization from nullptr_t.
	* testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
	Check for new constructor.

2022-04-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (hash<filesystem::path>): Define.
	* testsuite/27_io/filesystem/path/nonmember/hash_value.cc:
	Check std::hash specialization.

2022-04-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ptr_traits.h (__cpp_lib_constexpr_memory): Define
	conditionally.
	* include/bits/unique_ptr.h (__cpp_lib_constexpr_memory):
	Define for C++23.
	(default_delete, default_delete<T[]>, __uniq_ptr_impl)
	(unique_ptr, unique_ptr<T[], D>): Add constexpr to all member
	functions.
	* include/std/version (__cpp_lib_constexpr_memory): Define new
	value for C++23.
	* testsuite/20_util/unique_ptr/assign/constexpr.cc: New test.
	* testsuite/20_util/unique_ptr/comparison/constexpr.cc: New test.
	* testsuite/20_util/unique_ptr/cons/constexpr_c++20.cc: New test.
	* testsuite/20_util/unique_ptr/creation/constexpr.cc: New test.
	* testsuite/20_util/unique_ptr/modifiers/constexpr.cc: New test.
	* testsuite/20_util/unique_ptr/specialized_algorithms/constexpr.cc:
	New test.

2022-04-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105375
	* include/std/future (packaged_task): Add deduction guides.
	* testsuite/30_threads/packaged_task/cons/deduction.cc: New test.

2022-04-25  Philipp Fent  <fent@in.tum.de>

	* python/libstdcxx/v6/printers.py (StdSpanPrinter._iterator):
	Rename as iterator.
	(StdInitializerListPrinter): Define new printer.
	(build_libstdcxx_dictionary): Register new printer.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Check printer for
	initializer_list.

2022-04-22  Thomas W Rodgers  <trodgers@redhat.com>

	PR libstdc++/102994
	* include/bits/atomic_base.h (atomic_flag::notify_one,
	notify_all): Remove const qualification.
	(__atomic_base::notify_one, notify_all): Likewise.
	* include/std/atomic (atomic<bool>::notify_one, notify_all):
	Likewise.
	(atomic::notify_one, notify_all): Likewise.
	(atomic<T*>::notify_one, notify_all): Likewise.
	(atomic_notify_one, atomic_notify_all): Likewise.
	* testsuite/29_atomics/atomic/wait_notify/102994.cc: Adjust test
	to account for change in notify_one/notify_all signature.

2022-04-21  Patrick Palka  <ppalka@redhat.com>

	* include/std/charconv (__from_chars_alnum_to_val_table):
	Simplify initialization of __lower/__upper_letters.
	(__from_chars_alnum_to_val): Default the template parameter to
	false.
	* src/c++17/floating_from_chars.cc (starts_with_ci): Don't
	assume the uppercase and lowercase letters are contiguous.
	(__floating_from_chars_hex): Likewise.

2022-04-21  Patrick Palka  <ppalka@redhat.com>

	PR c++/105297
	PR c++/105322
	* include/std/charconv (__from_chars_alnum_to_val): Make
	initializer for __table dependent in an artificial way.

2022-04-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105324
	* src/c++17/floating_from_chars.cc (buffer_resource::do_allocate):
	Remove assertion.
	* testsuite/20_util/from_chars/pr105324.cc: New test.

2022-04-20  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string_view/operations/copy/char/constexpr.cc:
	Check correct feature test macro.

2022-04-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/93602
	* doc/xml/manual/prerequisites.xml: Document libiconv
	workarounds.
	* doc/html/manual/setup.html: Regenerate.
	* src/Makefile.am (CXXLINK): Add $(LTLIBICONV).
	* src/Makefile.in: Regenerate.

2022-04-19  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_to_chars.cc (_GLIBCXX_ASSERTIONS): Don't
	define.
	(__floating_to_chars_shortest): Add __builtin_unreachable calls to
	squelch false-positive -Wmaybe-uninitialized and -Wreturn-type
	warnings.
	(__floating_to_chars_precision): Likewise.

2022-04-19  Philipp Fent  <fent@in.tum.de>

	* python/libstdcxx/v6/printers.py (StdSpanPrinter): Define.
	* testsuite/libstdc++-prettyprinters/cxx20.cc: Test it.

2022-04-19  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): Fix shell operators.
	* configure: Regenerate.

2022-04-18  Patrick Palka  <ppalka@redhat.com>

	* include/std/charconv (__from_chars_pow2_base): Manually
	unroll the first iteration of the main loop and simplify
	accordingly.

2022-04-15  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/104858
	* include/bits/ranges_algo.h (__minmax_fn): Avoid dereferencing
	__first twice at the start.
	* testsuite/25_algorithms/minmax/constrained.cc (test06): New test.

2022-04-15  Patrick Palka  <ppalka@redhat.com>

	* include/std/charconv (__from_chars_alnum_to_val_table): Define.
	(__from_chars_alnum_to_val): Define.
	(__from_chars_binary): Rename to ...
	(__from_chars_pow2_base): ... this.  Generalize to handle any
	power-of-two base using __from_chars_alnum_to_val.
	(__from_chars_digit): Optimize digit recognition to a single
	test instead of two tests.  Use [[__unlikely___]] attribute.
	(__from_chars_alpha_to_num): Remove.
	(__from_chars_alnum): Use __from_chars_alnum_to_val.  Use a
	nested loop for the overflow case.  Maintain a lower bound
	on the number of available bits in the result and use it to
	omit the overflow check.
	(from_chars): Adjust appropriately.
	* src/c++17/floating_from_chars.cc (ascii_to_hexit): Remove.
	(__floating_from_chars_hex): Use __from_chars_alnum_to_val
	to recognize a hex digit instead.

2022-04-14  Palmer Dabbelt  <palmer@rivosinc.com>

	* acinclude.m4 (GLIBCXX_ENABLE_LOCK_POLICY): Force auto to mutex
	for RISC-V.
	* configure: Regenerate.

2022-04-14  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/intro.xml: Fix comment.

2022-04-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/precompiled/stdc++.h: Include <stacktrace> and
	<stdatomic.h> for C++23.

2022-04-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105269
	* include/bits/stl_vector.h (__cpp_lib_constexpr_vector):
	Define.
	* include/c_compatibility/stdatomic.h (__cpp_lib_stdatomic_h):
	Define.
	* include/std/optional (__cpp_lib_optional): Define new value
	for C++23.
	(__cpp_lib_monadic_optional): Remove.
	* include/std/version (__cpp_lib_constexpr_vector): Define.
	(__cpp_lib_stdatomic_h): Define.
	(__cpp_lib_optional): Define new value for C++23.
	(__cpp_lib_monadic_optional): Remove.
	* testsuite/20_util/optional/monadic/and_then.cc: Adjust.
	* testsuite/20_util/optional/requirements.cc: Adjust for C++23.
	* testsuite/20_util/optional/version.cc: Likewise.
	* testsuite/23_containers/vector/cons/constexpr.cc: Check
	feature test macro.
	* testsuite/29_atomics/headers/stdatomic.h/c_compat.cc:
	Likewise.
	* testsuite/20_util/optional/monadic/version.cc: Removed.
	* testsuite/23_containers/vector/requirements/version.cc: New test.
	* testsuite/29_atomics/headers/stdatomic.h/version.cc: New test.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): Check for mmap.
	* config.h.in: Regenerate.
	* configure: Regenerate.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (basic_stacktrace::current): Reallocate
	a smaller container if the unused capacity is larger than the
	used size.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (basic_stacktrace): Use _Impl::_M_clone
	or _Impl::_M_assign to initialize elements in allocated storage.
	(basic_stacktrace::_M_clear()): Use _Impl::_M_resize instead of
	_Impl::_M_destroy.
	(basic_stacktrace::_Impl::_M_destroy()): Replace with ...
	(basic_stacktrace::_Impl::_M_resize(size_type, allocator&)): New
	function.
	(basic_stacktrace::_Impl::_M_push_back): Use _M_xclone. Construct
	new element using allocator.
	(basic_stacktrace::_Impl::_M_clone): New function.
	(basic_stacktrace::_Impl::_M_xclone): New function.
	(basic_stacktrace::_Impl::_M_assign): New function.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (basic_stacktrace::_Impl::_M_allocate):
	Use nothrow new instead of try block for std::allocator.
	(basic_stacktrace::_Impl::_M_deallocate): Use delete for
	std::allocator.

2022-04-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (basic_stacktrace::current): Replace
	calls to _M_reserve and _S_curr_cb with call to _M_prepare.
	Check return value of backtrace_simple when max depth given.
	(basic_stacktrace::_M_reserve): Remove.
	(basic_stacktrace::_S_curr_cb): Remove.
	(basic_stacktrace::_M_prepare(size_type)): New function to
	reserve initial capacity and return callback.
	(basic_stacktrace::_Impl::_M_allocate): Remove check for 0 < n
	and remove redundant zeroing of _M_frames and _M_capacity.
	(basic_stacktrace::_Impl::_M_push_back): Add [[unlikely]]
	attribute. Assign _Impl instead of swapping.
	* testsuite/19_diagnostics/stacktrace/current.cc: New test.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (basic_stacktrace::_Impl::_M_allocate):
	Change [[unlikely]] attribute to [[likely]].

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105031
	* include/std/stacktrace (basic_stacktrace::basic_stacktrace):
	Fix allocator usage in constructors.
	(basic_stacktrace::operator=(const basic_stacktrace&)): Do not
	try to reallocate using const allocator.
	(basic_stacktrace::operator=(basic_stacktrace&&)): Fix
	if-constexpr with non-constant condition. Do not allocate new
	storage if allocator propagates. Do not set _M_size if
	allocation fails.
	(basic_stacktrace::swap(basic_stacktrace&)): Fix typo. Add
	assertion that non-propagating allocators are equal.
	* testsuite/19_diagnostics/stacktrace/stacktrace.cc: New test.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (basic_stacktrace::current): Duplicate
	implementation into each overload. Add noinline attribute and
	skip current frame.
	(basic_stacktrace::max_size()): Call _Impl::_S_max_size.
	(basic_stacktrace::_S_curr_cb()): New function defining lambda.
	(basic_stacktrace::_Impl::_S_max_size): New function defining
	maximum size in terms of allocator and size_type.
	(basic_stacktrace::_Impl::_M_allocate): Check against
	max_size().
	* testsuite/19_diagnostics/stacktrace/entry.cc: Call function
	for non-constexpr checks. Check line number is correct.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/stacktrace/entry.cc: Moved to...
	* testsuite/19_diagnostics/stacktrace/entry.cc: ...here.
	* testsuite/20_util/stacktrace/synopsis.cc: Moved to...
	* testsuite/19_diagnostics/stacktrace/synopsis.cc: ...here.
	* testsuite/20_util/stacktrace/version.cc: Moved to...
	* testsuite/19_diagnostics/stacktrace/version.cc: ...here.

2022-04-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/fs_path.h (path): Define special
	members after path::_Cmpt is complete.

2022-04-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105153
	* include/std/expected
	(expected<void,E>::expected(expected<U,G>&&)): Fix constraints.
	* testsuite/20_util/expected/cons.cc: Check constructor.

2022-04-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105154
	* include/std/expected (expected<void, E>::swap): Set
	_M_has_value to false for objects that previously had a value.
	* testsuite/20_util/expected/swap.cc: Fix test to check void
	specialization.

2022-04-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105146
	* include/std/expected (bad_expected_access): Move constructor
	parameter.
	* testsuite/20_util/expected/bad.cc: New test.

2022-04-07  Hans-Peter Nilsson  <hp@axis.com>

	* testsuite/20_util/expected/requirements.cc: Correct minimal-size
	test.

2022-04-02  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/105128
	* include/std/source_location (std::source_location::__impl): Move
	definition before using __builtin_ret_type.

2022-04-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/utility (unreachable): Define for C++23.
	* include/std/version (__cpp_lib_unreachable): Define.
	* src/c++11/debug.cc (__glibcxx_assert_fail): Check for valid
	arguments. Handle only the function being given.
	* testsuite/20_util/unreachable/1.cc: New test.
	* testsuite/20_util/unreachable/version.cc: New test.

2022-04-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/fs_fwd.h (copy_file): Remove
	incorrect noexcept from declaration.
	* include/experimental/bits/fs_path.h (path::begin, path::end):
	Add noexcept to declarations, to match definitions.

2022-04-01  Timm Bäder  <tbaeder@redhat.com>

	* include/bits/fs_ops.h: Fix filename in Doxygen comment.
	* include/experimental/bits/fs_ops.h: Likewise.

2022-03-31  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/new_opa.cc (aligned_alloc): Add comment.

2022-03-29  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/exception/38732.cc: Disable for C++23.
	* testsuite/18_support/headers/exception/synopsis.cc: Likewise.
	* testsuite/18_support/unexpected_handler.cc: Likewise.

2022-03-29  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (_Strong_order) [!__cpp_using_enum]: Add
	static data members for _Fp_fmt enumerators.

2022-03-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/version (__cpp_lib_variant): Fix conditions to
	match <variant>.
	(__cpp_lib_expected): Fix condition to match <expected>.

2022-03-28  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/optional/monadic/and_then.cc: Fix typo.
	* testsuite/20_util/optional/monadic/transform.cc: Likewise.
	* testsuite/22_locale/codecvt/always_noconv/char/1.cc: Likewise.
	* testsuite/22_locale/codecvt/encoding/char/1.cc: Likewise.
	* testsuite/22_locale/codecvt/in/char/1.cc: Likewise.
	* testsuite/22_locale/codecvt/max_length/char/1.cc: Likewise.
	* testsuite/22_locale/codecvt/out/char/1.cc: Likewise.
	* testsuite/22_locale/codecvt/unshift/char/1.cc: Likewise.

2022-03-27  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in: Add new header.
	* include/Makefile.am: Likewise.
	* include/Makefile.in: Regenerate.
	* include/precompiled/stdc++.h: Add new header.
	* include/std/version (__cpp_lib_expected): Define.
	* libsupc++/exception [__cplusplus > 202002] (unexpected)
	(unexpected_handler, set_unexpected): Do not declare for C++23.
	* include/std/expected: New file.
	* testsuite/20_util/expected/assign.cc: New test.
	* testsuite/20_util/expected/cons.cc: New test.
	* testsuite/20_util/expected/illformed_neg.cc: New test.
	* testsuite/20_util/expected/observers.cc: New test.
	* testsuite/20_util/expected/requirements.cc: New test.
	* testsuite/20_util/expected/swap.cc: New test.
	* testsuite/20_util/expected/synopsis.cc: New test.
	* testsuite/20_util/expected/unexpected.cc: New test.
	* testsuite/20_util/expected/version.cc: New test.

2022-03-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/bit (bit_cast, byteswap, endian): Add doxygen
	comments.

2022-03-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105027
	* include/std/bit (bit_cast): Add constraints.
	* testsuite/26_numerics/bit/bit.cast/105027.cc: New test.

2022-03-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/version [!_GLIBCXX_HOSTED]
	(__cpp_lib_hardware_interference_size): Define for freestanding.
	(__cpp_lib_bit_cast): Likewise.
	(__cpp_lib_is_layout_compatible): Likewise.
	(__cpp_lib_is_pointer_interconvertible): Likewise.
	(__cpp_lib_adaptor_iterator_pair_constructor): Do not define for
	freestanding.
	(__cpp_lib_invoke_r): Likewise.
	(__cpp_lib_ios_noreplace): Likewise.
	(__cpp_lib_monadic_optional): Likewise.
	(__cpp_lib_move_only_function): Likewise.
	(__cpp_lib_spanstream): Likewise.
	(__cpp_lib_stacktrace): Likewise.
	(__cpp_lib_string_contains): Likewise.
	(__cpp_lib_string_resize_and_overwrite): Likewise.
	(__cpp_lib_to_underlying): Likewise.

2022-03-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105021
	* include/bits/atomic_base.h [!_GLIBCXX_HOSTED]: Do not include
	<bits/atomic_wait.h> for freestanding.

2022-03-22  Hans-Peter Nilsson  <hp@axis.com>

	* testsuite/20_util/from_chars/6.cc (test01) [FE_DOWNWARD]:
	Conditionalize call to fesetround.

2022-03-21  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/104990
	* include/bits/locale_facets_nonio.tcc (get): Don't check if do_get
	isn't overloaded if __clang__ is defined.

2022-03-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104242
	* include/std/any (any(T&&)): Revert change to constraints.
	* testsuite/20_util/any/cons/104242.cc: New test.

2022-03-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92546
	* include/pstl/glue_algorithm_defs.h: Replace <functional> with
	<bits/stl_pair.h>.
	* include/pstl/utils.h: Replace <iterator> with <type_traits>.
	(__pstl::__internal::__except_handler): Use std::__terminate
	instead of std::terminate.
	* src/c++17/fs_path.cc: Include <array>.
	* testsuite/25_algorithms/adjacent_find/constexpr.cc: Include
	<functional>.
	* testsuite/25_algorithms/binary_search/constexpr.cc: Likewise.
	* testsuite/25_algorithms/clamp/constrained.cc: Likewise.
	* testsuite/25_algorithms/equal/constrained.cc: Likewise.
	* testsuite/25_algorithms/for_each/constrained.cc: Likewise.
	* testsuite/25_algorithms/includes/constrained.cc: Likewise.
	* testsuite/25_algorithms/is_heap/constexpr.cc: Likewise.
	* testsuite/25_algorithms/is_heap_until/constexpr.cc: Likewise.
	* testsuite/25_algorithms/is_permutation/constrained.cc: Include
	<iterator>.
	* testsuite/25_algorithms/is_sorted/constexpr.cc: Include
	<functional>.
	* testsuite/25_algorithms/is_sorted_until/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/lexicographical_compare/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/lexicographical_compare/constrained.cc:
	Likewise.
	* testsuite/25_algorithms/lexicographical_compare_three_way/1.cc:
	Include <array>.
	* testsuite/25_algorithms/lower_bound/constexpr.cc: Include
	<functional>.
	* testsuite/25_algorithms/max/constrained.cc: Likewise.
	* testsuite/25_algorithms/max_element/constrained.cc: Likewise.
	* testsuite/25_algorithms/min/constrained.cc: Likewise.
	* testsuite/25_algorithms/min_element/constrained.cc: Likewise.
	* testsuite/25_algorithms/minmax_element/constrained.cc:
	Likewise.
	* testsuite/25_algorithms/mismatch/constexpr.cc: Likewise.
	* testsuite/25_algorithms/move/93872.cc: Likewise.
	* testsuite/25_algorithms/move_backward/93872.cc: Include
	<iterator>.
	* testsuite/25_algorithms/nth_element/constexpr.cc: Include
	<functional>.
	* testsuite/25_algorithms/partial_sort/constexpr.cc: Likewise.
	* testsuite/25_algorithms/partial_sort_copy/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/search/constexpr.cc: Likewise.
	* testsuite/25_algorithms/search_n/constrained.cc: Likewise.
	* testsuite/25_algorithms/set_difference/constexpr.cc: Likewise.
	* testsuite/25_algorithms/set_difference/constrained.cc:
	Likewise.
	* testsuite/25_algorithms/set_intersection/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/set_intersection/constrained.cc:
	Likewise.
	* testsuite/25_algorithms/set_symmetric_difference/constexpr.cc:
	Likewise.
	* testsuite/25_algorithms/set_union/constexpr.cc: Likewise.
	* testsuite/25_algorithms/set_union/constrained.cc: Likewise.
	* testsuite/25_algorithms/sort/constexpr.cc: Likewise.
	* testsuite/25_algorithms/sort_heap/constexpr.cc: Likewise.
	* testsuite/25_algorithms/transform/constrained.cc: Likewise.
	* testsuite/25_algorithms/unique/constexpr.cc: Likewise.
	* testsuite/25_algorithms/unique/constrained.cc: Likewise.
	* testsuite/25_algorithms/unique_copy/constexpr.cc: Likewise.
	* testsuite/25_algorithms/upper_bound/constexpr.cc: Likewise.
	* testsuite/std/ranges/adaptors/elements.cc: Include <vector>.
	* testsuite/std/ranges/adaptors/lazy_split.cc: Likewise.
	* testsuite/std/ranges/adaptors/split.cc: Likewise.

2022-03-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/92546
	* include/bits/fs_path.h (path::make_preferred): Use
	handwritten loop instead of std::replace.

2022-03-17  Jonathan Wakely  <jwakely@redhat.com>

	PR middle-end/104966
	* include/bits/locale_facets_nonio.tcc
	(__moneypunct_cache::_M_cache): Replace try-catch with RAII and
	make all string copies before any stores to *this.

2022-03-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_character.h: Fix comment.

2022-03-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103407
	* config/abi/pre/gnu.ver: Make version for std::from_chars
	depend on HAVE_USELOCALE macro.
	* testsuite/util/testsuite_abi.cc (compare_symbols): Treat
	std::from_chars for floating-point types as undesignated if
	not found in the baseline symbols file.

2022-03-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/charconv (__cpp_lib_to_chars): Only define when
	both from_chars and to_chars are supported for floating-point
	types.
	(from_chars, to_chars): Adjust preprocessor conditions guarding
	declarations.
	* include/std/version (__cpp_lib_to_chars): Adjust condition to
	match <charconv> definition.
	* src/c++17/floating_from_chars.cc (from_chars_strtod): New
	function template.
	(from_chars): Simplify preprocessor checks and use
	from_chars_strtod when appropriate.

2022-03-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104875
	* src/c++11/codecvt.cc (read_utf8_code_point): Use char32_t to
	hold octets that will be left-shifted.

2022-03-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104870
	* src/c++17/floating_from_chars.cc: Check __SIZE_WIDTH__ >= 32
	before using fast_float.

2022-03-10  Detlef Vollmann  <dv@vollmann.ch>

	PR libstdc++/104866
	* include/bits/this_thread_sleep.h: Fix order of #endif and
	closing brace of namespace.

2022-03-10  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (_Strong_order::_S_fp_cmp) [__vax__]:
	Handle NaN.

2022-03-10  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (_Strong_ordering::_S_fp_cmp) [__vax__]: Use
	<=> comparison.

2022-03-09  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/104859
	* src/c++17/floating_to_chars.cc (__floating_to_chars_hex):
	Be explicit when narrowing the shifted effective_mantissa,
	since it may have an integer-class type.

2022-03-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/uses_allocator_args.h: Remove incorrect copyright
	notice.

2022-03-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104807
	* include/bits/c++config (__terminate, __glibcxx_assert_fail):
	Replace _GLIBCXX_VISIBILITY on function with visibility pragma.
	(__is_constant_evaluated): Add visibility pragma.

2022-03-07  Rasmus Villemoes  <rasmus.villemoes@prevas.dk>

	* config/locale/vxworks/ctype_members.cc: Remove <iostream>
	  include.

2022-03-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (__glibcxx_assert_fail): Add visibility
	attribute.
	(__terminate): Likewise.

2022-03-04  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (strong_order::_S_fp_cmp): Move typedef
	inside #if condition.

2022-03-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104748
	* testsuite/std/ranges/adaptors/all.cc: Use non-debug vector for
	constexpr test.

2022-03-03  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/names.cc (func): Undef on AIX.

2022-03-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96526
	* libsupc++/compare (strong_order): Add missing support for
	floating-point types.
	* testsuite/18_support/comparisons/algorithms/strong_order_floats.cc:
	New test.

2022-03-01  Jonathan Wakely  <jwakely@redhat.com>

	PR middle-end/103984
	* include/bits/regex_compiler.h (_BracketMatcher::_M_char): Use
	default member initializer.

2022-02-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104602
	* include/std/source_location (source_location::current): Use
	deduced type of __builtin_source_location().

2022-02-22  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_base.h (__detail::__is_initializer_list):
	Define.
	(viewable_range): Adjust as per P2415R2.
	* include/bits/ranges_cmp.h (__cpp_lib_ranges): Adjust value.
	* include/std/ranges (owning_view): Define as per P2415R2.
	(enable_borrowed_range<owning_view>): Likewise.
	(views::__detail::__can_subrange): Replace with ...
	(views::__detail::__can_owning_view): ... this.
	(views::_All::_S_noexcept): Sync with operator().
	(views::_All::operator()): Use owning_view instead of subrange
	as per P2415R2.
	* include/std/version (__cpp_lib_ranges): Adjust value.
	* testsuite/std/ranges/adaptors/all.cc (test06): Adjust now that
	views::all uses owning_view instead of subrange.
	(test08): New test.
	* testsuite/std/ranges/adaptors/lazy_split.cc (test09): Adjust
	now that rvalue non-view non-borrowed ranges are viewable.
	* testsuite/std/ranges/adaptors/split.cc (test06): Likewise.

2022-02-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104559
	* doc/xml/manual/evolution.xml: Document deprecation.
	* doc/html/manual/api.html: Regenerate.
	* include/bits/stl_bvector.h (insert(const_iterator, const bool&)):
	Remove default argument.
	(insert(const_iterator)): New overload with deprecated attribute.
	* testsuite/23_containers/vector/bool/modifiers/insert/104559.cc:
	New test.

2022-02-17  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Replace
	code that call cat->name() on std::error_category objects.
	Identify known categories by symbol name and use a hardcoded
	name. Print error code values as enumerators where appopriate.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Adjust expected
	name of custom category. Check io_errc and future_errc errors.

2022-02-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104542
	* include/bits/uses_allocator_args.h (make_obj_using_allocator)
	(uninitialized_construct_using_allocator): Add constexpr.
	* testsuite/20_util/uses_allocator/make_obj.cc: Check constexpr.
	* testsuite/20_util/uses_allocator/uninitialized_construct.cc: New test.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100912
	* config/locale/gnu/c_locale.h (__convert_from_v): Use inline
	namespace for IEEE128 long double mode.
	* config/os/gnu-linux/ldbl-ieee128-extra.ver: Add new symbol
	version and export __gnu_cxx_ieee128::__convert_from_v.
	* include/bits/locale_facets_nonio.tcc (money_put::__do_put):
	Make __ibm128 overload use snprintf directly
	* testsuite/util/testsuite_abi.cc: Add new symbol version.
	Remove stable IEEE128/LDBL versions.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103891
	* include/bits/c++config (_GLIBCXX_HAVE_COND_TRIVIAL_SPECIAL_MEMBERS):
	Remove.
	* include/std/variant: Check feature test macros instead.
	* include/std/version: Likewise.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/unsynchronized_pool_resource/allocate.cc:
	Fix typo.

2022-02-14  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/floating_to_chars.cc (FLOAT128_TO_CHARS): Depend on
	LONG_DOUBLE_ALT128_COMPAT instead of USE_FLOAT128.

2022-02-11  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/temporary_buffer.cc: Fix dg-warning target
	selector.

2022-02-11  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/monotonic_buffer_resource/allocate.cc:
	Ignore -Walloc-larger-than warning.
	* testsuite/20_util/unsynchronized_pool_resource/allocate.cc:
	Likewise.
	* testsuite/29_atomics/atomic/cons/user_pod.cc: Compile with -O1
	to avoid linker error for __atomic_is_lock_free.

2022-02-10  Thomas Rodgers  <rodgert@appliantology.com>

	* include/bits/atomic_wait.h (__waiter_base::_S_do_spin,
	__waiter_base::_S_do_spin_v): Change memory order from relaxed
	to acquire.

2022-02-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/c_compatibility/stdatomic.h (atomic_fetch_xor): Add
	using-declaration.
	(atomic_fetch_xor_explicit): Likewise.
	* testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: Check
	arithmetic and logical operations for atomic_int.

2022-02-10  Jonathan Wakely  <jwakely@redhat.com>

	* src/filesystem/dir-common.h (_GLIBCXX_HAVE_DIRFD): Undefine
	when <dirent.h> is not available.
	(_GLIBCXX_HAVE_UNLINKAT):  Likewise.

2022-02-09  Thomas Rodgers  <rodgert@appliantology.com>

	PR libstdc++/104442
	* include/bits/atomic_wait.h (__waiter::_M_do_wait_v): Move spin
	 loop inside do loop so that threads failing the wait, reload
	 _M_ver.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_dir.cc (_Dir(DIR*, const path&)): Change first
	parameter to _Dir_base&&.
	* src/filesystem/dir-common.h (_Dir_base(DIR*)): Remove.
	* src/filesystem/dir.cc (_Dir(DIR*, const path&)): Change first
	parameter to _Dir_base&&.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_LOCK_POLICY): Add comment about
	checking for CAS on correct word size.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/filesystem/operations/create_directories.cc:
	Adjust expected results for Windows.

2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104161
	* src/c++17/fs_dir.cc (fs::recursive_directory_iterator::__erase):
	[i_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Refresh entry._M_type member,
	instead of checking for errno values indicating a directory.
	* src/c++17/fs_ops.cc (fs::remove_all(const path&)): Use similar
	logic to non-throwing overload.
	(fs::remove_all(const path&, error_code&)): Add comments.
	* src/filesystem/ops-common.h: Likewise.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

	* src/filesystem/dir-common.h (_Dir_base::openat): Change return
	type to use portable posix::DIR alias.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/c_compatibility/stdatomic.h [__clang__]: Use
	#include_next <stdatomic.h>.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/fs_ops.h (fs::copy_file): Remove
	noexcept.
	(fs::create_directories): Likewise.
	(fs::remove_all): Likewise.
	* src/filesystem/ops.cc (fs::copy_file): Remove noexcept.
	(fs::create_directories): Likewise.
	(fs::remove_all): Likewise.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104161
	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for dirfd
	and unlinkat.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/bits/fs_dir.h (recursive_directory_iterator): Declare
	remove_all overloads as friends.
	(recursive_directory_iterator::__erase): Declare new member
	function.
	* include/bits/fs_fwd.h (remove, remove_all): Declare.
	* src/c++17/fs_dir.cc (_Dir): Add filename_only parameter to
	constructor. Pass file descriptor argument to base constructor.
	(_Dir::dir_and_pathname, _Dir::open_subdir, _Dir::do_unlink)
	(_Dir::unlink, _Dir::rmdir): Define new member functions.
	(directory_iterator): Pass filename_only argument to _Dir
	constructor.
	(recursive_directory_iterator::_Dir_stack): Adjust constructor
	parameters to take a _Dir rvalue instead of creating one.
	(_Dir_stack::orig): Add data member for storing original path.
	(_Dir_stack::report_error): Define new member function.
	(__directory_iterator_nofollow): Move here from dir-common.h and
	fix value to be a power of two.
	(__directory_iterator_filename_only): Define new constant.
	(recursive_directory_iterator): Construct _Dir object and move
	into _M_dirs stack. Pass skip_permission_denied argument to first
	advance call.
	(recursive_directory_iterator::increment): Use _Dir::open_subdir.
	(recursive_directory_iterator::__erase): Define new member
	function.
	* src/c++17/fs_ops.cc (ErrorReporter, do_remove_all): Remove.
	(fs::remove_all): Use new recursive_directory_iterator::__erase
	member function.
	* src/filesystem/dir-common.h (_Dir_base): Add int parameter to
	constructor and use openat to implement nofollow semantics.
	(_Dir_base::fdcwd, _Dir_base::set_close_on_exec, _Dir_base::openat):
	Define new member functions.
	(__directory_iterator_nofollow): Move to fs_dir.cc.
	* src/filesystem/dir.cc (_Dir): Pass file descriptor argument to
	base constructor.
	(_Dir::dir_and_pathname, _Dir::open_subdir): Define new member
	functions.
	(recursive_directory_iterator::_Dir_stack): Adjust constructor
	parameters to take a _Dir rvalue instead of creating one.
	(recursive_directory_iterator): Check for new nofollow option.
	Construct _Dir object and move into _M_dirs stack. Pass
	skip_permission_denied argument to first advance call.
	(recursive_directory_iterator::increment): Use _Dir::open_subdir.
	* src/filesystem/ops.cc (fs::remove_all): Use C++17 remove_all.

2022-02-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/allocator.h: Qualify std::allocator_traits in
	deprecated warnings.
	* libsupc++/exception (uncaught_exception): Add suggestion to
	deprecated warning.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_dir.cc (fs::recursive_directory_iterator::pop):
	Add [[maybe_unused]] attribute.
	* src/filesystem/dir.cc (fs::recursive_directory_iterator::pop):
	Likewise.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/multiset/operators/cmp_c++20.cc: Use
	custom comparison function for multiset.
	* testsuite/23_containers/set/operators/cmp_c++20.cc: Use custom
	comparison function for set.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/boost_concept_check.h (_OutputIteratorConcept):
	Change member function to data member of function pointer type.

2022-02-02  Martin Sebor  <msebor@redhat.com>

	PR libstdc++/101831
	* include/std/array (begin): Declare const member function attribute
	const.
	(end, rbegin, rend, size, max_size, empty, data): Same.
	* testsuite/23_containers/array/capacity/empty.cc: Add test cases.
	* testsuite/23_containers/array/capacity/max_size.cc: Same.
	* testsuite/23_containers/array/capacity/size.cc: Same.
	* testsuite/23_containers/array/iterators/begin_end.cc: New test.

2022-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/iterators/error_reporting.cc: Use
	autoconf macro to check whether d_type is present.
	* testsuite/experimental/filesystem/iterators/error_reporting.cc:
	Likewise.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/iterators/97731.cc: New test.
	* testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
	Check follow_directory_symlink option.
	* testsuite/experimental/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_dir.cc (recursive_directory_iterator::increment):
	Reset state to past-the-end iterator on error.
	(fs::recursive_directory_iterator::pop(error_code&)): Likewise.
	(fs::recursive_directory_iterator::pop()): Check _M_dirs before
	it might get reset.
	* src/filesystem/dir.cc (recursive_directory_iterator): Likewise,
	for the TS implementation.
	* testsuite/27_io/filesystem/iterators/error_reporting.cc: New test.
	* testsuite/experimental/filesystem/iterators/error_reporting.cc: New test.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_fwd.h (filesystem::perms): Fix comment.

2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104301
	* acinclude.m4 (GLIBCXX_ENABLE_CSTDIO): Print different messages
	for stdio_pure and stdio_posix options.
	* configure: Regenerate.

2022-02-01  Thomas Rodgers  <rodgert@appliantology.com>

	* include/bits/atomic_wait.h: Change memory order from
	Acquire/Release with relaxed loads to SeqCst+Release for
	accesses to the waiter's count.

2022-01-31  Martin Liska  <mliska@suse.cz>

	* acinclude.m4: Detect *_ld_is_mold and use it.
	* configure: Regenerate.

2022-01-30  Hans-Peter Nilsson  <hp@axis.com>

	* testsuite/27_io/basic_istream/get/char/lwg3464.cc: Don't run on
	simulator targets.
	* testsuite/27_io/basic_istream/get/wchar_t/lwg3464.cc: Likewise.

2022-01-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100516
	* include/bits/deque.tcc (_M_range_initialize<ForwardIterator>):
	Add __builtin_unreachable to loop.
	* testsuite/23_containers/deque/100516.cc: New test.

2022-01-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_base.h (ranges::advance): Avoid signed
	overflow. Do nothing if already equal to desired result.
	* testsuite/24_iterators/range_operations/advance_overflow.cc:
	New test.

2022-01-27  Martin Liska  <mliska@suse.cz>

	PR libstdc++/104259
	* acinclude.m4: Fix typo.
	* configure: Regenerate.

2022-01-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104019
	* include/bits/istream.tcc (basic_istream::sentry): Add braces
	around try-block.
	* include/bits/shared_ptr_base.h (_Sp_counted_array_base::_M_init):
	Add pragmas to disable bogus warnings from PR 61596.

2022-01-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104217
	* src/c++17/fs_ops.cc (_GNU_SOURCE): Define.
	* src/filesystem/dir.cc (_GNU_SOURCE): Define.
	* src/filesystem/ops.cc (_GNU_SOURCE): Define.

2022-01-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104161
	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for
	fdopendir.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* src/c++17/fs_dir.cc (_Dir): Add nofollow flag to constructor
	and pass it to base class constructor.
	(directory_iterator): Pass nofollow flag to _Dir constructor.
	(fs::recursive_directory_iterator::increment): Likewise.
	* src/c++17/fs_ops.cc (do_remove_all): Use nofollow option for
	directory_iterator constructor. Move error check outside loop.
	* src/filesystem/dir-common.h (_Dir_base): Add nofollow flag to
	constructor and when it's set use ::open with O_NOFOLLOW and
	O_DIRECTORY.
	* src/filesystem/dir.cc (_Dir): Add nofollow flag to constructor
	and pass it to base class constructor.
	(directory_iterator): Pass nofollow flag to _Dir constructor.
	(fs::recursive_directory_iterator::increment): Likewise.
	* src/filesystem/ops.cc (remove_all): Use nofollow option for
	directory_iterator constructor. Move error check outside loop.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104032
	* include/std/spanstream (basic_spanbuf(basic_spanbuf&&)): Use
	mem-initializer for _M_buf.
	(basic_spanbuf::Operator=(basic_spanbuf&&)): Fix ill-formed
	member access.
	* testsuite/27_io/spanstream/2.cc: New test.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/floating_from_chars.cc (USE_STRTOD_FOR_FROM_CHARS):
	Define macro for case where std::from_chars is implemented in
	terms of strtod, strtof or strtold.
	(buffer_resource, valid_fmt, find_end_of_float, pattern)
	(from_chars_impl, make_result, reserve_string): Do not define
	unless USE_STRTOD_FOR_FROM_CHARS is defined.
	(from_chars): Define when at least one of USE_LIB_FAST_FLOAT and
	USE_STRTOD_FOR_FROM_CHARS is defined, instead of
	_GLIBCXX_HAVE_USELOCALE. Use fast_float for long double when it
	is binary64.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104174
	* include/bits/hashtable_policy.h (_Map_base): Add partial
	specialization for maps with const key types.
	* testsuite/23_containers/unordered_map/104174.cc: New test.

2022-01-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104019
	* include/bits/shared_ptr_base.h (_Sp_counted_base<>::_M_release):
	Set members to zero without type punning.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/shared_ptr/cons/array.cc: Fix comment.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/87193
	PR libstdc++/104019
	* include/bits/alloc_traits.h (__cpp_lib_allocator_traits_is_always_equal):
	Define as type long.
	* include/bits/allocator.h (__cpp_lib_incomplete_container_elements):
	Likewise.
	* include/bits/basic_string.h (__cpp_lib_string_udls): Likewise.
	* include/bits/chrono.h (__cpp_lib_chrono): Likewise.
	(__cpp_lib_chrono_udls): Likewise.
	* include/bits/move.h (__cpp_lib_addressof_constexpr): Likewise.
	* include/bits/node_handle.h (__cpp_lib_node_extract): Likewise.
	* include/bits/range_access.h (__cpp_lib_nonmember_container_access):
	Likewise.
	* include/bits/shared_ptr.h (__cpp_lib_enable_shared_from_this):
	Likewise.
	* include/bits/stl_algo.h (__cpp_lib_clamp): Likewise.
	(__cpp_lib_sample): Likewise.
	* include/bits/stl_algobase.h (__cpp_lib_robust_nonmodifying_seq_ops):
	Likewise.
	* include/bits/stl_function.h (__cpp_lib_transparent_operators):
	Likewise.
	* include/bits/stl_iterator.h (__cpp_lib_make_reverse_iterator):
	Likewise.
	* include/bits/stl_map.h (__cpp_lib_map_try_emplace):
	Likewise.
	* include/bits/stl_tree.h (__cpp_lib_generic_associative_lookup):
	Likewise.
	* include/bits/unique_ptr.h (__cpp_lib_make_unique):
	Likewise.
	* include/bits/unordered_map.h (__cpp_lib_unordered_map_try_emplace):
	Likewise.
	* include/c_global/cmath (__cpp_lib_hypot): Likewise.
	* include/c_global/cstddef (__cpp_lib_byte): Likewise.
	* include/std/atomic (__cpp_lib_atomic_is_always_lock_free):
	Likewise.
	* include/std/complex (__cpp_lib_complex_udls): Likewise.
	* include/std/filesystem (__cpp_lib_filesystem): Likewise.
	* include/std/functional (__cpp_lib_not_fn): Likewise.
	(__cpp_lib_boyer_moore_searcher): Likewise.
	* include/std/iomanip (__cpp_lib_quoted_string_io): Likewise.
	* include/std/mutex (__cpp_lib_scoped_lock): Likewise.
	* include/std/numeric (__cpp_lib_gcd_lcm): Likewise.
	(__cpp_lib_gcd, __cpp_lib_lcm): Likewise.
	* include/std/tuple (__cpp_lib_apply): Likewise.
	(__cpp_lib_make_from_tuple): Likewise.
	* include/std/type_traits (__cpp_lib_integral_constant_callable)
	(__cpp_lib_bool_constant, __cpp_lib_logical_traits)
	(__cpp_lib_is_null_pointer, __cpp_lib_transformation_trait_aliases)
	(__cpp_lib_result_of_sfinae, __cpp_lib_void_t)
	(__cpp_lib_is_swappable, __cpp_lib_is_invocable)
	(__cpp_lib_has_unique_object_representations)
	(__cpp_lib_is_aggregate): Likewise.
	* include/std/version: Likewise.
	* libsupc++/new (__cpp_lib_launder): Likewise.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/version (__cpp_lib_shared_ptr_arrays): Fix
	condition for C++17 definition.

2022-01-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_atomic.h (_Sp_atomic::_Atomic_count):
	Add constexpr.
	(_Sp_atomic::_M_ptr): Add default member-initializer.
	* testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
	Check constant initialization.
	* testsuite/20_util/weak_ptr/atomic_weak_ptr.cc: Likewise.

2022-01-20  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/cxx11-ios_failure.cc (__constinit): Define as
	equivalent attribute for Clang.
	* src/c++11/future.cc (__constinit): Likewise.
	* src/c++11/system_error.cc (__constinit): Likewise.
	* src/c++17/memory_resource.cc (__constinit): Likewise.

2022-01-20  Jonathan Wakely  <jwakely@redhat.com>

	* scripts/testsuite_flags.in: Only add src/filesystem/.libs and
	src/libbacktrace/.libs to LDFLAGS if those directories exist.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

	* configure.ac (GLIBCXX_ENABLE_DEBUG_FLAGS): Remove -gdwarf-4
	from default flags.
	* configure: Regenerate.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104123
	* testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: Include
	<stddef.h>.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

	* scripts/testsuite_flags.in: Add src/libbacktrace/.libs to
	linker search paths.
	* src/Makefile.am: Fix src/debug/libbacktrace build.
	* src/Makefile.in: Regenerate.
	* src/libbacktrace/Makefile.am: Use per-library CPPFLAGS
	variable. Use symlinks for the source files.
	* src/libbacktrace/Makefile.in: Regenerate.

2022-01-19  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd.h (__floating_point_flags): Do
	not rely on math_errhandling to expand to a constant expression.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/evolution.xml: Document deprecations.
	* doc/xml/manual/status_cxx2017.xml: Update status.
	* doc/html/*: Regenerate.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_tempbuf.h (get_temporary_buffer): Change
	_GLIBCXX14_DEPRECATED to _GLIBCXX17_DEPRECATED.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_pair.h (_PCC::_DeprConsPair): Remove unused
	function.

2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104101
	* include/bits/shared_ptr_atomic.h (_Sp_atomic::_Atomic_count::lock):
	Only use __thread_relax if __cpp_lib_atomic_wait is defined.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104099
	* include/bits/basic_string.h (basic_string(nullptr_t)): Only
	define for C++23.
	(operator=(nullptr_t)): Likewise.
	* include/bits/cow_string.h: Likewise.
	* include/std/string_view (basic_string_view(nullptr_t)):
	Likewise.
	* testsuite/21_strings/basic_string/cons/char/nullptr.cc: Adjust
	expected error. Add examples that become ill-formed in C++23.
	* testsuite/21_strings/basic_string_view/cons/char/nonnull.cc:
	Adjust expected errors.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/nonnull.cc:
	Likewise.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104098
	* include/bits/stl_iterator.h (reverse_iterator): Check
	__cpp_lib_concepts instead of __cplusplus.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101124
	* include/bits/stl_pair.h (pair): Adjust constraints on
	deprecated constructors accepting literal zero as null pointer
	constant. Improve wording of deprecated attribute.
	* testsuite/20_util/pair/cons/99957.cc: Check that deprecated
	constructors do not cause ambiguities for copyable types.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_function.h (ptr_fun): Fix suggestion for
	non-deprecated alternative.

2022-01-18  Tom Honermann  <tom@honermann.net>

	* acinclude.m4: Define config macros if uchar.h provides
	c8rtomb() and mbrtoc8().
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/c_compatibility/uchar.h (c8rtomb, mbrtoc8): Define.
	* include/c_global/cuchar (c8rtomb, mbrtoc8): Likewise.
	* include/c_std/cuchar (c8rtomb, mbrtoc8): Likewise.
	* testsuite/21_strings/headers/cuchar/functions_std_cxx20.cc:
	New test.
	* testsuite/21_strings/headers/cuchar/functions_std_fchar8_t.cc:
	New test.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/Makefile.am: Install new header.
	* include/Makefile.in: Regenerate.
	* include/c_compatibility/stdatomic.h: New file.
	* testsuite/29_atomics/headers/stdatomic.h/c_compat.cc: New test.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104080
	* src/c++17/fast_float/LOCAL_PATCHES: Update.
	* src/c++17/fast_float/fast_float.h (FASTFLOAT_IS_BIG_ENDIAN):
	Define in terms of __BYTE_ORDER__.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104080
	* src/c++17/fast_float/LOCAL_PATCHES: UPDATE.
	* src/c++17/fast_float/fast_float.h (round): Use explicit
	template argument list for std::min.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2017.xml: Update C++17 status.
	* doc/xml/manual/status_cxx2020.xml: Use 12.1 instead of 12 for
	upcoming release.
	* doc/html/manual/status.html: Regenerate.

2022-01-18  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_FULLY_DYNAMIC_STRING): Improve
	comments.
	* configure: Regenerate.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_from_chars.cc: (USE_LIB_FAST_FLOAT):
	Conditionally define, and use it to conditionally include
	fast_float.
	(from_chars): Use fast_float for float and double when
	USE_LIB_FAST_FLOAT.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/fast_float/LOCAL_PATCHES: Update.
	* src/c++17/fast_float/fast_float.h (from_chars_advanced): In
	case of over/underflow, return errc::result_out_of_range and don't
	modify 'value'.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/fast_float/LOCAL_PATCHES: Update.
	* src/c++17/fast_float/fast_float.h: Apply local modifications.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/fast_float/LOCAL_PATCHES: New file.
	* src/c++17/fast_float/MERGE: New file.
	* src/c++17/fast_float/README.md: New file, copied from the
	fast_float repository.
	* src/c++17/fast_float/fast_float.h: New file, an amalgamation
	of the fast_float library.

2022-01-17  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_from_chars.cc: Include <bit>.
	(ascii_to_hexit, starts_with_ci): Conditionally define.
	(__floating_from_chars_hex):  Conditionally define.
	(from_chars): Use __floating_from_chars_hex for
	chars_format::hex parsing of binary32/64 float/double.
	(testsuite/20_util/from_chars/7.cc): New test.
	* testsuite/20_util/from_chars/7.cc: New file.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_BACKTRACE): New macro.
	* configure.ac: Use GLIBCXX_ENABLE_BACKTRACE.
	* include/Makefile.am: Add new header.
	* include/Makefile.in: Regenerate.
	* include/std/stacktrace: New header.
	* include/std/version (__cpp_lib_stacktrace): Define.
	* Makefile.in: Regenerate.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* doc/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.am: Regenerate.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++20/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.
	* src/libbacktrace/Makefile.am: New file.
	* src/libbacktrace/Makefile.in: New file.
	* src/libbacktrace/backtrace-rename.h: New file.
	* src/libbacktrace/backtrace-supported.h.in: New file.
	* src/libbacktrace/config.h.in: New file.
	* testsuite/lib/libstdc++.exp (check_effective_target_stacktrace):
	New proc.
	* testsuite/20_util/stacktrace/entry.cc: New test.
	* testsuite/20_util/stacktrace/synopsis.cc: New test.
	* testsuite/20_util/stacktrace/version.cc: New test.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Use final C++20 option
	names.
	* doc/html/manual/status.html: Regenerate.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103650
	* include/Makefile.am: Rename LT_OBJDIR and STDC_HEADERS.
	* include/Makefile.in: Regenerate.
	* testsuite/17_intro/headers/c++1998/103650.cc: New test.

2022-01-17  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd.h (__floating_point_flags): Do
	not rely on the presence of the math_errhandling macro.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_atomic.h (_Sp_atomic): Add typename
	to qualified-id for dependent type.

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>

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

2022-01-17  Jonathan Wakely  <jwakely@redhat.com>
	    Thomas Rodgers  <trodgers@redhat.com>

	* include/bits/shared_ptr_atomic.h (__cpp_lib_atomic_shared_ptr):
	New macro.
	(_Sp_atomic): New class template.
	(atomic<shared_ptr<T>>, atomic<weak_ptr<T>>): New partial
	specializations.
	* include/bits/shared_ptr_base.h (__shared_count, __weak_count)
	(__shared_ptr, __weak_ptr): Declare _Sp_atomic as a friend.
	* include/std/version (__cpp_lib_atomic_shared_ptr): New macro.
	* testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc: New
	test.
	* testsuite/20_util/weak_ptr/atomic_weak_ptr.cc: New test.

2022-01-15  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd.h: Move feature detection bools
	and add __have_avx512bitalg, __have_avx512vbmi2,
	__have_avx512vbmi, __have_avx512ifma, __have_avx512cd,
	__have_avx512vnni, __have_avx512vpopcntdq.
	(__detail::__machine_flags): New function which returns a unique
	uint64 depending on relevant -m and -f flags.
	(__detail::__odr_helper): New type alias for either an anonymous
	type or a type specialized with the __machine_flags number.
	(_SimdIntOperators): Change template parameters from _Impl to
	_Tp, _Abi because _Impl now has an __odr_helper parameter which
	may be _OdrEnforcer from the anonymous namespace, which makes
	for a bad base class.
	(many): Either add __odr_helper template parameter or mark as
	always_inline.
	* include/experimental/bits/simd_detail.h: Add defines for
	AVX512BITALG, AVX512VBMI2, AVX512VBMI, AVX512IFMA, AVX512CD,
	AVX512VNNI, AVX512VPOPCNTDQ, and AVX512VP2INTERSECT.
	* include/experimental/bits/simd_builtin.h: Add __odr_helper
	template parameter or mark as always_inline.
	* include/experimental/bits/simd_fixed_size.h: Ditto.
	* include/experimental/bits/simd_math.h: Ditto.
	* include/experimental/bits/simd_scalar.h: Ditto.
	* include/experimental/bits/simd_neon.h: Add __odr_helper
	template parameter.
	* include/experimental/bits/simd_ppc.h: Ditto.
	* include/experimental/bits/simd_x86.h: Ditto.

2022-01-14  Uroš Bizjak  <ubizjak@gmail.com>

	* testsuite/22_locale/numpunct/members/char/3.cc:
	Require pt_PT locale instead of nl_NL.
	(test02): Use pt_PT locale instead of nl_NL.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91260
	PR libstdc++/91383
	PR libstdc++/95065
	* include/backward/binders.h (bind1st, bind2nd): Add deprecated
	attribute.
	* include/bits/refwrap.h (_Maybe_unary_or_binary_function):
	Disable deprecated warnings for base classes.
	(_Reference_wrapper_base): Likewise.
	* include/bits/shared_ptr_base.h (_Sp_owner_less): Likewise.
	* include/bits/stl_bvector.h (_Bit_iterator_base): Likewise.
	* include/bits/stl_function.h (unary_function, binary_function):
	Add deprecated attribute.
	(unary_negate, not1, binary_negate, not2, ptr_fun)
	(pointer_to_unary_function, pointer_to_binary_function)
	(mem_fun_t, const_mem_fun_t, mem_fun_ref_t, const_mem_fun_ref_t)
	(mem_fun1_t, const_mem_fun1_t, mem_fun_ref1_t)
	(const_mem_fun1_ref_t, mem_fun, mem_fun_ref): Add deprecated
	attributes.
	* include/bits/stl_iterator.h: Disable deprecated warnings for
	std::iterator base classes.
	* include/bits/stl_iterator_base_types.h (iterator): Add
	deprecated attribute.
	* include/bits/stl_map.h (map::value_compare): Disable
	deprecated warnings for base class.
	* include/bits/stl_multimap.h (multimap::value_compare):
	Likewise.
	* include/bits/stl_raw_storage_iter.h (raw_storage_iterator):
	Add deprecated attribute.
	* include/bits/stl_tempbuf.h (get_temporary_buffer): Likewise.
	* include/bits/stream_iterator.h: Disable deprecated warnings.
	* include/bits/streambuf_iterator.h: Likewise.
	* include/ext/bitmap_allocator.h: Remove unary_function base
	classes.
	* include/ext/functional: Disable deprecated warnings.
	* include/ext/rope: Likewise.
	* include/ext/throw_allocator.h: Likewise.
	* include/std/type_traits (result_of): Add deprecated attribute.
	* include/tr1/functional: Disable deprecated warnings.
	* include/tr1/functional_hash.h: Likewise.
	* testsuite/20_util/function_objects/binders/1.cc: Add
	-Wno-disable-deprecations.
	* testsuite/20_util/function_objects/binders/3113.cc: Likewise.
	* testsuite/20_util/function_objects/constexpr.cc: Add
	dg-warning.
	* testsuite/20_util/raw_storage_iterator/base.cc: Likewise.
	* testsuite/20_util/raw_storage_iterator/dr2127.cc: Likewise.
	* testsuite/20_util/raw_storage_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/20_util/raw_storage_iterator/requirements/explicit_instantiation/1.cc:
	Likewise.
	* testsuite/20_util/raw_storage_iterator/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/reference_wrapper/24803.cc:
	Likewise.
	* testsuite/20_util/reference_wrapper/typedefs.cc: Enable for
	C++20 and check for absence of nested types.
	* testsuite/20_util/shared_ptr/comparison/less.cc: Remove
	std::binary_function base class.
	* testsuite/20_util/temporary_buffer.cc: Add dg-warning.
	* testsuite/21_strings/basic_string/cons/char/69092.cc: Remove
	std::iterator base class.
	* testsuite/24_iterators/back_insert_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/24_iterators/front_insert_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/24_iterators/insert_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/24_iterators/istream_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/24_iterators/istreambuf_iterator/92285.cc:
	Likewise.
	* testsuite/24_iterators/istreambuf_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/24_iterators/ostream_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/24_iterators/ostreambuf_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/24_iterators/reverse_iterator/requirements/base_classes.cc:
	Likewise.
	* testsuite/25_algorithms/copy/34595.cc:
	Likewise.
	* testsuite/25_algorithms/minmax/3.cc: Remove std::binary_function
	base class.
	* testsuite/25_algorithms/all_of/requirements/explicit_instantiation/2.cc:
	Disable deprecated warnings.
	* testsuite/25_algorithms/all_of/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/any_of/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/any_of/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/copy_if/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/copy_if/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/count_if/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/count_if/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/find_end/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/find_end/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/find_first_of/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/find_first_of/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/find_if/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/find_if/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/find_if_not/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/find_if_not/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/for_each/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/for_each/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/is_partitioned/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/is_partitioned/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/is_permutation/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/is_permutation/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/none_of/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/none_of/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/partition/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/partition/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/partition_copy/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/partition_copy/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/partition_point/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/partition_point/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/random_shuffle/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/random_shuffle/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/remove_copy_if/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/remove_copy_if/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/remove_if/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/remove_if/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/replace_copy_if/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/replace_copy_if/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/replace_if/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/replace_if/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/search/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/search/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/search_n/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/search_n/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/stable_partition/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/stable_partition/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/25_algorithms/transform/requirements/explicit_instantiation/2.cc:
	Likewise.
	* testsuite/25_algorithms/transform/requirements/explicit_instantiation/pod.cc:
	Likewise.
	* testsuite/27_io/basic_filebuf/underflow/wchar_t/9178.cc: Add
	dg-warning.
	* testsuite/ext/pb_ds/example/priority_queue_erase_if.cc:
	Likewise.
	* testsuite/ext/pb_ds/example/priority_queue_split_join.cc:
	Likewise.
	* testsuite/tr1/3_function_objects/reference_wrapper/typedefs.cc:
	Disable deprecated warnings.
	* testsuite/tr1/6_containers/hash/requirements/base_classes.cc:
	Likewise.
	* testsuite/util/regression/trait/erase_if_fn.hpp: Remove
	std::unary_function base classes.
	* testsuite/util/testsuite_iterators.h (output_iterator_wrapper):
	Remove std::iterator base classes.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr.h (__cpp_lib_shared_ptr_weak_type):
	Correct type of macro value.
	(shared_ptr): Add additional friend declarations.
	(make_shared, allocate_shared): Constrain existing overloads and
	remove static_assert.
	* include/bits/shared_ptr_base.h (__cpp_lib_smart_ptr_for_overwrite):
	New macro.
	(_Sp_counted_ptr_inplace<T, Alloc, Lp>): New partial
	specialization for use with make_shared_for_overwrite.
	(__cpp_lib_shared_ptr_arrays): Update value for C++20.
	(_Sp_counted_array_base): New class template.
	(_Sp_counted_array): New class template.
	(__shared_count(_Tp*&, const _Sp_counted_array_base&, _Init)):
	New constructor for allocating shared arrays.
	(__shared_ptr(const _Sp_counted_array_base&, _Init)): Likewise.
	* include/std/version (__cpp_lib_shared_ptr_weak_type): Correct
	type.
	(__cpp_lib_shared_ptr_arrays): Update value for C++20.
	(__cpp_lib_smart_ptr_for_overwrite): New macro.
	* testsuite/20_util/shared_ptr/creation/99006.cc: Adjust
	expected errors.
	* testsuite/20_util/shared_ptr/creation/array.cc: New test.
	* testsuite/20_util/shared_ptr/creation/overwrite.cc: New test.
	* testsuite/20_util/shared_ptr/creation/version.cc: New test.
	* testsuite/20_util/unique_ptr/creation/for_overwrite.cc: Check
	feature test macro. Test non-trivial default-initialization.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_construct.h (_Construct, _Construct_novalue):
	Also cast away cv-qualifiers when converting pointer to void.
	* testsuite/20_util/allocator/void.cc: Test construct function
	with cv-qualified types.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103992
	* include/bits/stl_iterator.h (common_iterator): Use
	std::construct_at instead of placement new.
	* testsuite/24_iterators/common_iterator/1.cc: Check copy
	construction is usable in constant expressions.

2022-01-14  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2011.xml: Document new tokens
	accepted by std::random_device constructor.
	* doc/html/manual/status.html: Regenerate.

2022-01-12  Patrick Palka  <ppalka@redhat.com>

	* testsuite/20_util/to_chars/103955.cc: Add explicit dg-do
	directive.

2022-01-12  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/103955
	* src/c++17/floating_to_chars.cc (__floating_to_chars_hex):
	Track the excess precision separately from the effective
	precision.  Avoid overflow in bounds check by splitting it into
	two checks.
	(__floating_to_chars_precision): Avoid overflow in bounds checks
	similarly.
	* testsuite/20_util/to_chars/103955.cc: New test.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103726
	* include/Makefile.am: Install <source_location> for
	freestanding.
	* include/Makefile.in: Regenerate.
	* include/std/version (__cpp_lib_source_location): Define for
	freestanding.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (ranges::lazy_split_view::_InnerIter::end()):
	Add neoxcept (LWG 3593).

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (ranges::__detail::__box): Add constexpr to
	assignment operators (LWG 3572).
	* testsuite/std/ranges/adaptors/filter.cc: Check assignment of a
	view that uses copyable-box.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103726
	* include/Makefile.am: Install <coroutine> for freestanding.
	* include/Makefile.in: Regenerate.
	* include/std/coroutine: Adjust headers and preprocessor
	conditions.
	(__coroutine_traits_impl): Use concepts when available.
	[_GLIBCXX_HOSTED] (hash<coroutine_handle>): Define.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ostream (operator<<(basic_ostream&, charT)):
	Use unformatted input if no padding is needed.
	(operator<<(basic_ostream<char>&, char)): Likewise.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103891
	* include/bits/c++config (_GLIBCXX_HAVE_COND_TRIVIAL_SPECIAL_MEMBERS):
	Define.
	* include/std/variant (__cpp_lib_variant): Only define C++20
	value when the compiler is known to support conditionally
	trivial destructors.
	* include/std/version (__cpp_lib_variant): Likewise.

2022-01-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (common_iterator): Add constexpr
	to all member functions (LWG 3574).
	* testsuite/24_iterators/common_iterator/1.cc: Evaluate some
	tests as constant expressions.
	* testsuite/24_iterators/common_iterator/2.cc: Likewise.

2022-01-10  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/77760
	* include/bits/locale_facets_nonio.h (__time_get_state): New struct.
	(time_get::_M_extract_via_format): Declare new method with
	__time_get_state& as an extra argument.
	* include/bits/locale_facets_nonio.tcc (_M_extract_via_format): Add
	__state argument, set various fields in it while parsing.  Handle %j,
	%U, %w and %W, fix up handling of %y, %Y and %C, don't adjust tm_hour
	for %p immediately.  Add a wrapper around the method without the
	__state argument for backwards compatibility.
	(_M_extract_num): Remove all __len == 4 special cases.
	(time_get::do_get_time, time_get::do_get_date, time_get::do_get): Zero
	initialize __state, pass it to _M_extract_via_format and finalize it
	at the end.
	(do_get_year): For 1-2 digit parsed years, map 0-68 to 2000-2068,
	69-99 to 1969-1999.  For 3-4 digit parsed years use that as year.
	(get): If do_get isn't overloaded from the locale_facets_nonio.tcc
	version, don't call do_get but call _M_extract_via_format instead to
	pass around state.
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.30): Export _M_extract_via_format
	with extra __time_get_state and __time_get_state::_M_finalize_state.
	* src/c++98/locale_facets.cc (is_leap, day_of_the_week,
	day_of_the_year): New functions in anon namespace.
	(mon_yday): New var in anon namespace.
	(__time_get_state::_M_finalize_state): Define.
	* testsuite/22_locale/time_get/get/char/4.cc: New test.
	* testsuite/22_locale/time_get/get/wchar_t/4.cc: New test.
	* testsuite/22_locale/time_get/get_year/char/1.cc (test01): Parse 197
	as year 197AD instead of error.
	* testsuite/22_locale/time_get/get_year/char/5.cc (test01): Parse 1 as
	year 2001 instead of error.
	* testsuite/22_locale/time_get/get_year/char/6.cc: New test.
	* testsuite/22_locale/time_get/get_year/wchar_t/1.cc (test01): Parse
	197 as year 197AD instead of error.
	* testsuite/22_locale/time_get/get_year/wchar_t/5.cc (test01): Parse
	1 as year 2001 instead of error.
	* testsuite/22_locale/time_get/get_year/wchar_t/6.cc: New test.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103866
	* acinclude.m4 (GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS): Do
	nothing for freestanding builds.
	(GLIBCXX_ENABLE_HOSTED): Define FREESTANDING_FLAGS.
	* configure.ac: Do not use AC_LIBTOOL_DLOPEN when configured
	with --without-headers.  Do not use GCC_HEADER_STDINT for
	freestanding builds.
	* libsupc++/Makefile.am (HOSTED_CXXFLAGS): Use -ffreestanding
	for freestanding builds.
	* configure: Regenerate.
	* Makefile.in: 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++20/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/28_regex/algorithms/regex_replace/char/103664.cc:
	Add dg-timeout-factor directive.
	* testsuite/28_regex/basic_regex/84110.cc: Likewise.
	* testsuite/28_regex/basic_regex/ctors/char/other.cc: Likewise.
	* testsuite/28_regex/match_results/102667.cc: Likewise.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/using.xml: Update documentation around default
	-std option.
	* doc/html/*: Regenerate.

2022-01-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100017
	* src/c++17/Makefile.am (AM_CXXFLAGS): Add -nostdinc++.
	* src/c++17/Makefile.in: Regenerate.

2022-01-09  Sandra Loosemore  <sandra@codesourcery.com>

	* testsuite/18_support/type_info/constexpr.cc: Add explicit
	-fdelete-null-pointer-checks option.

2022-01-06  Pavel I. Kryukov  <pavel.kryukov@phystech.edu>
	    Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103853
	* include/bits/forward_list.tcc (forward_list::merge): Check for
	self-merge.
	* testsuite/23_containers/forward_list/operations/merge.cc: New test.

2022-01-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h (basic_regex, match_results): Qualify
	name in friend declaration, to work around Clang bug.

2022-01-06  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/ext/rope/pthread7-rope.cc: Add dg-timeout-factor.

2022-01-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103911
	* include/std/charconv (__from_chars_alpha_to_num): Return
	char instead of unsigned char. Change invalid return value to
	127 instead of using numeric trait.
	(__from_chars_alnum): Fix comment. Do not use std::isdigit.
	Change type of variable to char.

2022-01-05  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/68303
	* include/bits/hashtable_policy.h
	(_Hashtable_hash_traits<_Hash>): New.
	(_Hash_code_base<>::_M_hash_code(const _Hash_node_value<>&)): New.
	(_Hashtable_base<>::_M_key_equals): New.
	(_Hashtable_base<>::_M_equals): Use latter.
	(_Hashtable_base<>::_M_key_equals_tr): New.
	(_Hashtable_base<>::_M_equals_tr): Use latter.
	* include/bits/hashtable.h
	(_Hashtable<>::__small_size_threshold()): New, use _Hashtable_hash_traits.
	(_Hashtable<>::find): Loop through elements to look for key if size is lower
	than __small_size_threshold().
	(_Hashtable<>::_M_emplace(true_type, _Args&&...)): Likewise.
	(_Hashtable<>::_M_insert_unique(_Kt&&, _Args&&, const _NodeGenerator&)): Likewise.
	(_Hashtable<>::_M_compute_hash_code(const_iterator, const key_type&)): New.
	(_Hashtable<>::_M_emplace(const_iterator, false_type, _Args&&...)): Use latter.
	(_Hashtable<>::_M_find_before_node(const key_type&)): New.
	(_Hashtable<>::_M_erase(true_type, const key_type&)): Use latter.
	(_Hashtable<>::_M_erase(false_type, const key_type&)): Likewise.
	* src/c++11/hashtable_c++0x.cc: Include <bits/functional_hash.h>.
	* testsuite/util/testsuite_performance.h
	(report_performance): Use 9 width to display memory.
	* testsuite/performance/23_containers/insert_erase/unordered_small_size.cc:
	New performance test case.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103919
	* include/bits/basic_string.h (basic_string(const T&, size_t, size_t)):
	Relax constraints on string_view parameter.
	* include/bits/cow_string.h (basic_string(const T&, size_t, size_t)):
	Likewise.
	* testsuite/21_strings/basic_string/cons/char/103919.cc: New test.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.30): Export new symbol for
	ARM EABI.
	* include/bits/c++config (_GLIBCXX23_CONSTEXPR): Define.
	* include/std/version (__cpp_lib_constexpr_typeinfo): Define.
	* libsupc++/tinfo.cc: Add #error to ensure non-inline definition
	is emitted.
	(type_info::__equal): Define alias symbol.
	* libsupc++/typeinfo (type_info::before): Combine different
	implementations into one.
	(type_info::operator==): Likewise. Use address equality for
	constant evaluation. Call __equal for targets that require the
	definition to be non-inline.
	* testsuite/18_support/type_info/constexpr.cc: New test.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/cxx11-ios_failure.cc (io_error_category): Define
	class and virtual functions as 'final'.
	(io_category_instance): Use constinit union to make the object
	immortal.
	* src/c++11/future.cc (future_error_category): Define class and
	virtual functions as 'final'.
	(future_category_instance): Use constinit union.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Strip
	versioned namespace from the type name that is printed.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdRegexStatePrinter): New
	printer for std::regex NFA states.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/forward_list/operations/1.cc: Fill in
	placeholders in comments.
	* testsuite/23_containers/forward_list/operations/2.cc:
	Likewise.
	* testsuite/23_containers/forward_list/operations/3.cc:
	Likewise.
	* testsuite/23_containers/forward_list/operations/4.cc:
	Likewise.
	* testsuite/23_containers/forward_list/operations/5.cc:
	Likewise.
	* testsuite/23_containers/forward_list/operations/6.cc:
	Likewise.
	* testsuite/23_containers/forward_list/operations/7.cc:
	Likewise.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103848
	* include/bits/stl_deque.h (operator-): Do not use 0 as null
	pointer constant.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/alloc_traits.h (allocator_traits<allocator<void>>):
	Use std::_Construct for construct.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103877
	* doc/xml/faq.xml: Add '-x c++' to preprocessor command.
	* doc/html/faq.html: Regenerate.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h (__regex_algo_impl): Change __policy and
	__match_mode template parameters to be function parameters.
	(regex_match, regex_search): Pass policy and match mode as
	function arguments.
	* include/bits/regex.tcc (__regex_algo_impl): Change template
	parameters to function parameters.
	* include/bits/regex_compiler.h (_RegexTranslatorBase): Use
	'if constexpr' for conditions using template parameters.
	(_RegexTranslator): Likewise.
	* include/bits/regex_executor.tcc (_Executor::_M_handle_accept):
	Likewise.
	* testsuite/util/testsuite_regex.h (regex_match_debug)
	(regex_search_debug): Move template arguments to function
	arguments.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_regex.h (regex_match_debug): Compare
	results even if the match failed.

2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex_compiler.tcc: Adjust all calls to
	__throw_regex_error.
	* include/bits/regex_error.h (__throw_regex_error): Add noreturn
	attribute.
	* include/bits/regex_scanner.tcc: Likewise.
	* src/c++11/regex.cc (desc): New helper function.
	(regex_error::regex_error(error_type)): Use desc to get a string
	corresponding to the error code.


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