2022-04-21  Release Manager

	* GCC 11.3.0 released.

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

	* doc/xml/manual/status_cxx1998.xml: Refer to GCC 11 not
	mainline.
	* 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.
	* doc/html/manual/status.html: Regenerate.

2022-04-14  Iain Sandoe  <iain@sandoe.co.uk>

	Backported from master:
	2021-11-19  Iain Sandoe  <iain@sandoe.co.uk>

	* testsuite/lib/prune.exp: Prune dsymutil (ld64) warning.

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

	Backported from master:
	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.

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

	Backported from master:
	2021-12-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103630
	* libsupc++/exception_ptr.h (exception_ptr): Fix exception
	specifications on inline definitions.
	(make_exception_ptr): Decay the template parameter. Use typeid
	of the static type.
	* testsuite/18_support/exception_ptr/103630.cc: New test.

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

	Backported from master:
	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.

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

	Backported from master:
	2021-12-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103638
	* include/bits/atomic_timed_wait.h: Check _GLIBCXX_HAS_GTHREADS
	before using std::mutex and std::__condvar.

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

	Backported from master:
	2021-10-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant (__detail::__variant::__as): Add missing
	noexcept to first overload.

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

	Backported from master:
	2021-10-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90943
	* include/std/variant (__cpp_lib_variant): Update value.
	(__detail::__variant::__as): New helpers implementing the
	as-variant exposition-only function templates.
	(visit, visit<R>): Use __as to upcast the variant parameters.
	* include/std/version (__cpp_lib_variant): Update value.
	* testsuite/20_util/variant/visit_inherited.cc: New test.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	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.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-21  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_iterator.h (common_iterator::__arrow_proxy):
	Make fully constexpr as per LWG 3595.
	(common_iterator::__postfix_proxy): Likewise.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-21  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (split_view::base): Add forward_range
	constraint as per LWG 3591.
	(split_view::begin, lazy_split_view::end): Also check
	simpleness of _Pattern as per LWG 3592.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-21  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (join_view::__iter_cat::_S_iter_cat): Adjust
	criteria for returning bidirectional_iterator_tag as per LWG 3535.
	(join_view::_Iterator::_S_iter_concept): Likewise.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-21  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_base.h (viewable_range): Adjust as per
	LWG 3481.
	* testsuite/std/ranges/adaptors/all.cc (test07): New test.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-19  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (iota_view::_Iterator::operator+): Adjust
	definition as per LWG 3580.
	(iota_view::_Iterator::operator-): Likewise.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-19  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_util.h
	(__detail::__uses_nonqualification_pointer_conversion): Define
	and use it ...
	(__detail::__convertible_to_nonslicing): ... here, as per LWG 3470.
	* testsuite/std/ranges/subrange/1.cc: New test.

2022-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-19  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (iota_view::_Iterator): Befriend iota_view.
	(iota_view::_Sentinel): Likewise.
	(iota_view::iota_view): Add three overloads, each taking an
	iterator/sentinel pair as per LWG 3523.
	* testsuite/std/ranges/iota/iota_view.cc (test06): New test.

2022-04-07  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	2022-02-08  Jonathan Wakely  <jwakely@redhat.com>

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

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

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

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

	Backported from master:
	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.

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

	Backported from master:
	2022-02-01  Jonathan Wakely  <jwakely@redhat.com>

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

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	2022-01-19  Jonathan Wakely  <jwakely@redhat.com>

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

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	2022-03-08  Jonathan Wakely  <jwakely@redhat.com>

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

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

	Backported from master:
	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.

2022-02-17  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-10-21  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/102358
	* include/bits/stl_iterator.h (__niter_base): Make constexpr
	for C++20.
	(__miter_base): Likewise.
	* testsuite/25_algorithms/move/constexpr.cc: New test.

2022-02-11  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/103904
	* include/std/ranges (__detail::__box): Revert r11-9555 changes
	to the constraints on the partial specialization and the
	now-unnecessary special member functions.
	(__detail::__non_propagating_cache::operator=): Remove
	now-unused overload added by r11-9555.
	(split_view::_OuterIter::__current): Adjust after reverting the
	r11-9555 change to the type of _M_current.
	(split_view::_M_current): Revert r11-9555 change to its type.
	(split_view::split_view): Constrain the default constructor
	further.
	* testsuite/std/ranges/adaptors/detail/copyable_box.cc: Disable
	now-irrelevant test for the r11-9555 changes to the partial
	specialization of __box.

2022-02-11  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-07-16  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/103904
	PR libstdc++/101231
	* include/std/ranges (_CachedPosition::_M_get): For non-forward
	ranges, just call __builtin_unreachable.
	* testsuite/std/ranges/istream_view.cc (test05): New test.

2022-02-11  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-21  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/103904
	* include/bits/ranges_cmp.h (__cpp_lib_ranges): Adjust value.

2022-02-11  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/103904
	* include/bits/iterator_concepts.h (weakly_incrementable): Remove
	default_initializable requirement.
	* include/bits/ranges_base.h (ranges::view): Likewise.
	* include/bits/ranges_util.h (subrange): Constrain the default
	ctor.
	* include/bits/stl_iterator.h (common_iterator): Constrain the
	default ctor.
	(counted_iterator): Likewise.
	* include/std/ranges (__detail::__box::operator=): Handle
	self-assignment in the primary template.
	(__detail::__box): In the partial specialization: adjust
	constraints as per P2325.  Add specialized operator= for the
	case when the wrapped type is not copyable.  Constrain the
	default ctor.  Avoid list-initialization.
	(single_view): Constraint the default ctor.
	(iota_view): Relax semiregular constraint to copyable.
	Constrain the default ctor.
	(iota_view::_Iterator): Constraint the default ctor.
	(ref_view): Remove the default ctor.  Remove NSDMIs.
	(ref_view::_Iterator): Constrain the default ctor.
	(__detail::__non_propagating_cache::operator=): Define overload
	for assigning from a value of the underlying type.
	(filter_view): Likewise.
	(filter_view::_Iterator): Likewise.
	(transform_view): Likewise.
	(transform_view::_Iterator): Likewise.
	(take_view): Likewise.
	(take_view::_Iterator): Likewise.
	(take_while_view): Likewise.
	(take_while_view::_Iterator): Likewise.
	(drop_while_view): Likewise.
	(drop_while_view::_Iterator): Likewise.
	(join_view): Likewise.
	(split_view::_OuterIter::__current): Adjust after changing the
	type of _M_current.
	(split_view::_M_current): Wrap it in a __non_propagating_cache.
	(split_view::split_view): Constrain the default ctor.
	(common_view): Constrain the default ctor.
	(reverse_view): Likewise.
	(elements_view): Likewise.
	* include/std/span (enable_view<span<_ElementType, _Extent>>):
	Define this partial specialization to true unconditionally.
	* include/std/version (__cpp_lib_ranges): Adjust value.
	* testsuite/std/ranges/adaptors/detail/semiregular_box.cc:
	Rename to ...
	* testsuite/std/ranges/adaptors/detail/copyable_box.cc: ... this.
	(test02): Adjust now that __box is copyable-box not
	semiregular-box.
	(test03): New test.
	* testsuite/std/ranges/p2325.cc: New test.
	* testsuite/std/ranges/single_view.cc (test06): New test.
	* testsuite/std/ranges/view.cc: Adjust now that view doesn't
	require default_initializable.

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	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.

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

	Backported from master:
	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>

	Backported from master:
	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.

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

	Backported from master:
	2021-11-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/char_traits.h (__gnu_cxx::char_traits::move):
	Do not compare unrelated pointers during constant evaluation.
	* testsuite/21_strings/char_traits/requirements/constexpr_functions_c++20.cc:
	Improve tests for char_traits::move.

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

	Backported from master:
	2021-12-10  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Add _GLIBCXX_
	prefix to NO_SLEEP macro.
	* config.h.in: Regenerate.
	* configure: Regenerate.

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

	Backported from master:
	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>

	Backported from master:
	2021-12-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103501
	* include/bits/stl_tree.h (_Rb_tree(_Rb_tree&&, false_type)):
	Clear container if elements have been moved-from.
	* testsuite/23_containers/map/allocator/move_cons.cc: Expect
	moved-from container to be empty.
	* testsuite/23_containers/multimap/allocator/move_cons.cc:
	Likewise.
	* testsuite/23_containers/multiset/allocator/103501.cc: New test.
	* testsuite/23_containers/set/allocator/103501.cc: New test.

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

	Backported from master:
	2021-12-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103549
	* include/bits/regex.h (match_results): Give names to template
	parameters in first declaration.
	(match_results::_M_begin): Add default member-initializer.

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

	Backported from master:
	2021-11-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103453
	* config/allocator/malloc_allocator_base.h
	(_GLIBCXX_SANITIZE_STD_ALLOCATOR): Define for Clang.
	* config/allocator/new_allocator_base.h
	(_GLIBCXX_SANITIZE_STD_ALLOCATOR): Likewise.

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

	Backported from master:
	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.
	[!_GLIBCXX_USE_CXX11_ABI] (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>

	Backported from master:
	2022-01-05  Jonathan Wakely  <jwakely@redhat.com>

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

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

	Backported from master:
	2021-08-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/alloc_traits.h (allocator_traits): Add explicit
	specialization for allocator<void>. Improve doxygen comments.
	* include/bits/allocator.h (allocator<void>): Restore for the
	versioned namespace.
	(allocator<void>::construct, allocator<void>::destroy): Remove.
	* include/ext/extptr_allocator.h (_Extptr_allocator<void>):
	Add default constructor and converting constructor.

2021-12-10  Thomas Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2021-12-10  Thomas Rodgers  <rodgert@twrodgers.com>

	PR libstdc++/102994
	* include/bits/atomic_base.h (__atomic_base<_PTp*>::wait()):
	Add const qualifier.
	* include/std/atomic (atomic<_Tp*>::wait(), atomic_wait()):
	Likewise.
	* testsuite/29_atomics/atomic/wait_notify/102994.cc:
	New test.

2021-11-26  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/29_atomics/atomic_float/1.cc: Reorder directives.

2021-11-26  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-26  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/unordered_map/modifiers/move_assign.cc:
	Change dg-do compile to run.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/lwg2499.cc:
	Likewise.

2021-11-26  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96416
	* include/bits/ptr_traits.h (pointer_traits): Remove
	static_assert checking for valid element_type.
	(pointer_traits::element_type, pointer_traits::pointer_to):
	Do not define when element type cannot be deduced.
	* testsuite/20_util/pointer_traits/lwg3545.cc: New test.
	* testsuite/20_util/to_address/1_neg.cc: Adjust dg-error line.
	* testsuite/20_util/to_address/lwg3545.cc: New test.

2021-11-25  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101608
	* include/bits/ranges_algobase.h (__fill_n_fn): Check for
	constant evaluation before using memset.
	* testsuite/25_algorithms/fill_n/constrained.cc: Check
	byte-sized values as well.

2021-11-25  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-18  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdBitReferencePrinter): Use
	'std::vector<bool>::reference' as type name, not _Bit_reference.
	(build_libstdcxx_dictionary): Register printers for vector<bool>
	types in debug mode too.
	* testsuite/libstdc++-prettyprinters/simple.cc: Adjust expected
	output for invalid _Bit_reference. Use vector<bool>::reference
	instead of _Bit_reference.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.

2021-11-25  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/libstdc++-prettyprinters/80276.cc: Add xfail for
	debug mode.
	* testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.

2021-11-25  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/libstdc++.exp: Rename effective target keywords
	to avoid dashes in the name.
	* testsuite/*: Update effective targe keywords.

2021-11-24  François Dumont  <fdumont@gcc.gnu.org>

	Backported from master:
	2021-08-08  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite/25_algorithms/copy/debug/constexpr_neg.cc: Replace 'failed_assertion'
	dg-prune-output reason with 'builtin_unreachable'.
	* testsuite/25_algorithms/copy_backward/debug/constexpr_neg.cc: Likewise.
	* testsuite/25_algorithms/equal/debug/constexpr_neg.cc: Likewise.
	* testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_neg.cc: Likewise.
	* testsuite/25_algorithms/lower_bound/debug/constexpr_partitioned_pred_neg.cc: Likewise.
	* testsuite/25_algorithms/lower_bound/debug/constexpr_valid_range_neg.cc: Likewise.
	* testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_neg.cc: Likewise.
	* testsuite/25_algorithms/upper_bound/debug/constexpr_partitioned_pred_neg.cc: Likewise.
	* testsuite/25_algorithms/upper_bound/debug/constexpr_valid_range_neg.cc: Likewise.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/unordered_map/cons/default.cc: Add
	equality comparison operators to allocator.
	* testsuite/23_containers/unordered_set/cons/default.cc:
	Likewise.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/utility (__is_in_place_type_v): Define
	variable template to detect in_place_type_t specializations.
	(__is_in_place_type): Replace class template with alias
	template using __is_in_place_type_v.
	* include/std/any (any(T&&)): Check __is_in_place_type first and
	avoid instantiating is_copy_constructible unnecessarily.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/alloc_traits.h: Suppress doxygen documentation.
	* include/bits/allocated_ptr.h: Likewise.
	* include/bits/enable_special_members.h: Likewise.
	* include/bits/hashtable.h: Likewise.
	* include/bits/hashtable_policy.h: Likewise.
	* include/bits/uses_allocator.h: Likewise.
	* include/bits/node_handle.h: Document node handles and suppress
	documentation for protected members.
	* include/std/any: Suppress documentation for implementation
	details.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100748
	PR libstdc++/103133
	* config/os/gnu-linux/os_defines.h (_GLIBCXX_GTHREAD_USE_WEAK):
	Define for glibc 2.34 and later.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/random/random_device/cons/token.cc:
	Print results of random_device_available checks.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/random/random_device/cons/token.cc:
	Retry if random devices produce the same value.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_construct.h (_Construct): Use
	std::construct_at when constant evaluated.
	* include/std/optional (_Storage, _Optional_payload, optional):
	Add constexpr as specified by P2231R1.
	* include/std/version (__cpp_lib_optional): Update value for
	C++20.
	* testsuite/20_util/optional/requirements.cc: Check feature test
	macro.
	* testsuite/20_util/optional/constexpr/assign.cc: New test.
	* testsuite/20_util/optional/constexpr/cons/conv.cc: New test.
	* testsuite/20_util/optional/constexpr/modifiers.cc: New test.
	* testsuite/20_util/optional/constexpr/swap.cc: New test.
	* testsuite/20_util/optional/version.cc: New test.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/optional (__throw_bad_optional_access):
	Replace GNU attribute with C++11 attribute.
	(optional::value, optional::value_or): Use if statements
	instead of conditional expressions.
	* include/std/optional (__throw_bad_optional_access)
	(optional::value, optional::value_or): Likewise.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/optional (nullptr_t): Make constructor noexcept.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98725
	* include/std/ostream (operator<<(basic_ostream<char, Tr>&, wchar_t))
	(operator<<(basic_ostream<char, Tr>&, const wchar_t*)): Always
	define as deleted. Do not check _GLIBCXX_USE_WCHAR_T.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ostream (operator<<(const volatile void*)):
	Add new overload, as per P1147R1.
	* testsuite/27_io/basic_ostream/inserters_other/char/volatile_ptr.cc:
	New test.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102894
	* include/std/any (make_any): Add SFINAE constraint.
	* testsuite/20_util/any/102894.cc: New test.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-23  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/system_error.cc (generic_error_category): Define
	class and virtual functions as 'final'.
	(generic_error_category::equivalent(int, const error_condition&)):
	Override.
	(system_error_category): Define class and virtual functions as
	'final'.
	(system_error_category::equivalent(int, const error_condition&)):
	Override.
	(generic_category_instance, system_category_instance): Use
	constinit union to make the objects immortal.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-31  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98421
	* include/std/span (span(Iter, size_type), span(Iter, Iter)):
	Add valid range checks.
	* testsuite/23_containers/span/cons_1_assert_neg.cc: New test.
	* testsuite/23_containers/span/cons_2_assert_neg.cc: New test.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_function.h (function::function(F&&)): Give
	name to defaulted template parameter, to improve diagnostics.
	Use markdown for more doxygen comments.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_function.h (_function_base::_Base_manager):
	Replace _M_init_functor with a function template using a
	forwarding reference, and a pair of _M_create function
	templates. Reuse _M_create for the clone operation.
	(function::_Decay_t): New alias template.
	(function::_Callable): Simplify by using _Decay.
	(function::function(F)): Change parameter to forwarding
	reference, as per LWG 2447. Add noexcept-specifier. Simplify
	constraints.
	(function::operator=(F&&)): Add noexcept-specifier.
	* testsuite/20_util/function/cons/lwg2774.cc: New test.
	* testsuite/20_util/function/cons/noexcept.cc: New test.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-19  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in: Update to Doxygen 1.9.2

2021-11-24  Antony Polukhin  <antoshkka@gmail.com>

	Backported from master:
	2021-08-17  Antony Polukhin  <antoshkka@gmail.com>
		    Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.tcc (seed_seq::seed_seq): Reserve capacity
	if distance is O(1).
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line number.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_function.h (function::function(F)): Add
	static assertions to check constructibility requirements.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_function.h (_Function_base): Add
	default member initializers and define constructor as defaulted.
	(function::_M_invoker): Add default member initializer.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_function.h: Improve doxygen comments.

2021-11-24  Tim Adye  <Tim.Adye@cern.ch>

	Backported from master:
	2021-06-04  Tim Adye  <Tim.Adye@cern.ch>

	* include/std/any (any::_Manager::_S_access): New static
	function to access the contained value.
	(any::emplace, __any_caster): Use _S_access member of the
	manager type.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/syncstream (basic_syncbuf::swap()): Remove
	noexcept, as per LWG 3498.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100153
	* include/bits/vector.tcc (vector<bool>::_M_shrink_to_fit()):
	When size() is zero just deallocate and reset.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/move.h (forward(remove_reference_t<T>&&)):
	Improve text of static_assert.
	* testsuite/20_util/forward/c_neg.cc: Adjust dg-error.
	* testsuite/20_util/forward/f_neg.cc: Likewise.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-08  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/22_locale/conversions/buffer/1.cc: Check
	_GLIBCXX_USE_WCHAR_T.
	* testsuite/22_locale/conversions/buffer/3.cc: Likewise. Add
	test using char16_t.
	* testsuite/22_locale/conversions/string/1.cc: Check
	_GLIBCXX_USE_WCHAR_T.
	* testsuite/27_io/filesystem/path/generic/generic_string.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/make_preferred.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/native/alloc.cc: Likewise.
	* testsuite/27_io/filesystem/path/native/string-char8_t.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/native/string.cc: Likewise.
	* testsuite/28_regex/algorithms/regex_match/extended/wstring_locale.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/generic/generic_string.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/native/alloc.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/native/string-char8_t.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/native/string.cc:
	Likewise.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/gdb-test.exp: Add target selector support to the
	dg-final directives.
	* testsuite/libstdc++-prettyprinters/80276.cc: Add xfail for
	C++20.
	* testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/prettyprinters.exp: Tweak
	comment.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100117
	* testsuite/17_intro/headers/c++1998/49745.cc: Explicitly list
	all C++ headers instead of including <bits/stdc++.h>

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-16  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/modifiers/append/wchar_t/1.cc:
	Fix reads past the end of strings.
	* testsuite/21_strings/basic_string/operations/compare/wchar_t/1.cc:
	Likewise.
	* testsuite/experimental/string_view/operations/compare/wchar_t/1.cc:
	Likewise.

2021-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103086
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Check unique_ptr
	with non-empty pointer and non-empty deleter.

2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103086
	* python/libstdcxx/v6/printers.py (_tuple_impl_get): New helper
	for accessing the tuple element stored in a _Tuple_impl node.
	(tuple_get): New function for accessing a tuple element.
	(unique_ptr_get): New function for accessing a unique_ptr.
	(UniquePointerPrinter, StdPathPrinter): Use unique_ptr_get.
	* python/libstdcxx/v6/xmethods.py (UniquePtrGetWorker): Cast
	tuple to its base class before accessing _M_head_impl.

2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103240
	* libsupc++/tinfo2.cc (type_info::before): Use unadjusted name
	to check for the '*' prefix.
	* testsuite/util/testsuite_shared.cc: Add type_info object for
	use in new test.
	* testsuite/18_support/type_info/103240.cc: New test.

2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103381
	* include/ext/bitmap_allocator.h: Include <bits/stl_function.h>
	instead of <functional>.

2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101571
	* include/bits/ranges_uninitialized.h (_DestroyGuard): Change
	constructor parameter to reference and use addressof.
	* testsuite/util/testsuite_iterators.h: Define deleted operator&
	overloads for test iterators.

2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_wait.h (_GLIBCXX_HAVE_PLATFORM_WAIT):
	Define before first attempt to check it.

2021-11-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_timed_wait.h (__platform_wait_until_impl):
	Return false for ETIMEDOUT and true otherwise.

2021-11-22  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (begin(valarray), end(valarray)):
	Add noexcept.

2021-11-01  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-11-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103022
	* include/std/valarray (begin, end): Do not dereference an empty
	valarray. Add noexcept and [[nodiscard]].
	* testsuite/26_numerics/valarray/range_access.cc: Check empty
	valarray. Check iterator properties. Run as well as compiling.
	* testsuite/26_numerics/valarray/range_access2.cc: Likewise.
	* testsuite/26_numerics/valarray/103022.cc: New test.

2021-10-19  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-19  Jonathan Wakely  <jwakely@redhat.com>

	* doc/Makefile.am (stamp-html-doxygen, stamp-html-doxygen)
	(stamp-latex-doxygen, stamp-man-doxygen): Fix recipes for
	relative ${top_srcdir}.
	* doc/Makefile.in: Regenerate.

2021-10-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101583
	* include/bits/hashtable.h (_Hashtable): Replace mixin with
	_Enable_default_ctor. Construct it explicitly in all
	non-forwarding, non-defaulted constructors.
	* testsuite/23_containers/unordered_map/cons/default.cc: Check
	non-default constructors can be used.
	* testsuite/23_containers/unordered_set/cons/default.cc:
	Likewise.

2021-10-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-13  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/path/construct/102592.C: Moved to...
	* testsuite/27_io/filesystem/path/construct/102592.cc: ...here.
	* testsuite/28_regex/match_results/102667.C: Moved to...
	* testsuite/28_regex/match_results/102667.cc: ...here.

2021-10-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102592
	* include/bits/fs_path.h (path::path(Iter, Iter, format))
	(path::append(Iter, Iter), path::concat(Iter, Iter)): Call
	__string_from_range directly, instead of two-argument overload
	of _S_convert.
	(path::_S_convert(Iter, Iter)): Remove.
	* testsuite/27_io/filesystem/path/construct/102592.C: New test.

2021-10-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/string_view (basic_string_view(It, End)): Add
	noexcept-specifier.
	* testsuite/21_strings/basic_string_view/cons/char/range.cc:
	Check noexcept-specifier. Also check construction without CTAD.

2021-10-13  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-04-28  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100187
	PR libstdc++/100237
	PR libstdc++/100249
	PR libstdc++/100287
	* include/bits/ranges_algo.h (__search_n_fn::operator()): Give
	the __value_comp lambda an explicit bool return type.
	(__is_permutation_fn::operator()): Give the __proj_scan local
	variable auto&& return type.  Give the __comp_scan lambda an
	explicit bool return type.
	(__remove_fn::operator()): Give the __pred lambda an explicit
	bool return type.
	(__partition_fn::operator()): Don't std::move __first twice
	when returning an empty subrange.
	(__min_fn::operator()): Don't std::move __comp.
	(__max_fn::operator()): Likewise.
	(__minmax_fn::operator()): Likewise.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/net/internet/resolver/ops/lookup.cc:
	Try other service if "http" fails.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100285
	* configure.ac: Check for O_NONBLOCK.
	* configure: Regenerate.
	* include/experimental/internet: Include <ws2tcpip.h> for
	Windows.  Use preprocessor conditions around more constants.
	* include/experimental/socket: Use preprocessor conditions
	around more constants.
	* testsuite/experimental/net/internet/resolver/base.cc: Only use
	constants when the corresponding C macro is defined.
	* testsuite/experimental/net/socket/basic_socket.cc: Likewise.
	* testsuite/experimental/net/socket/socket_base.cc: Likewise.
	Make preprocessor checks more fine-grained.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100863
	* include/bits/hashtable.h (_Hashtable): Conditionally delete
	default constructor by deriving from _Enable_special_members.
	* testsuite/23_containers/unordered_map/cons/default.cc: New test.
	* testsuite/23_containers/unordered_set/cons/default.cc: New test.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100863
	PR libstdc++/65816
	* include/bits/hashtable_policy.h (_Hashtable_ebo_helper):
	Value-initialize subobject.
	* testsuite/23_containers/unordered_map/allocator/default_init.cc:
	Remove XFAIL.
	* testsuite/23_containers/unordered_set/allocator/default_init.cc:
	Remove XFAIL.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-17  Jonathan Wakely  <jwakely@redhat.com>

	* doc/Makefile.am: Simplify doxygen recipes and use --latex_cmd.
	* doc/Makefile.in: Regenerate.
	* doc/doxygen/user.cfg.in (LATEX_CMD_NAME): Add placeholder
	value.
	* scripts/run_doxygen (print_usage): Always print to stdout and
	do not exit.
	(fail): New function for exiting on error.
	(parse_options): Handle --latex_cmd. Do not treat --help the
	same as errors. Simplify handling of required arguments.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-28  Jonathan Wakely  <jwakely@redhat.com>

	* doc/Makefile.am (stamp-pdf-doxygen): Improve comment about
	dealing with errors. Use '@' to prevent shell command being
	echoed.
	* doc/Makefile.in: Regenerate.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/allocator.h (allocator::is_always_equal): Deprecate.
	* include/bits/iterator_concepts.h (indirectly_readable_traits):
	Add LWG issue number to comment.
	* include/std/memory_resource (polymorphic_allocator::release):
	Deprecate.
	* testsuite/20_util/allocator/requirements/typedefs.cc: Add
	dg-warning for deprecation. Also check std::allocator<void>.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-31  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/names.cc: Undefine some more names used
	by Solaris system headers.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102048
	* include/ext/rope (rope::erase(size_type)): Remove broken
	function.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90787
	* testsuite/27_io/filesystem/iterators/directory_iterator.cc:
	Use new __gnu_test::permissions_are_testable() function.
	* testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/exists.cc: Likewise.
	* testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Likewise.
	* testsuite/27_io/filesystem/operations/status.cc: Likewise.
	* testsuite/27_io/filesystem/operations/symlink_status.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/temp_directory_path.cc:
	Likewise.
	* testsuite/experimental/filesystem/iterators/directory_iterator.cc:
	Likewise.
	* testsuite/experimental/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/exists.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/is_empty.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/remove.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/remove_all.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/temp_directory_path.cc:
	Likewise.
	* testsuite/util/testsuite_fs.h (__gnu_test::permissions_are_testable):
	New function to guess whether testing permissions will work.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-08-02  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/101599
	* include/bits/ranges_algo.h (__reverse_copy_fn::operator()):
	Add missing std::move in return statement.
	(__partition_copy_fn::operator()): Rename templtae parameter
	_O2 to _Out2.  Uglify function parameters out_true and out_false.
	* include/bits/ranges_algobase.h (__copy_or_move): Add missing
	std::move to recursive call that unwraps a __normal_iterator
	output iterator.
	* testsuite/25_algorithms/copy/constrained.cc (test06): New test.
	* testsuite/25_algorithms/move/constrained.cc (test05): New test.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-08-02  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/101589
	* include/std/ranges (lazy_split_view::_InnerIter::base): Make
	the const& overload unconstrained and return a const reference
	as per LWG 3533.  Make unconditionally noexcept.
	(elements_view::base): Revert accidental r12-569 change.
	(elements_view::_Iterator::base): Make the const& overload
	unconstrained and return a const reference as per LWG 3533.
	Make unconditionally noexcept.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-08-02  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/101483
	* include/std/ranges (join_view::_Iterator::_Iterator): Add
	missing std::move.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-20  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (split_view::_InnerIter::base): Define as
	per P2210.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-19  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (transform_view::_Iterator::_S_iter_concept):
	Consider _Base instead of _Vp as per LWG 3555.
	(elements_view::_Iterator::_S_iter_concept): Likewise.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-19  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (split_view::_OuterIter::value_type::begin):
	Remove the non-const overload, and remove the copyable constraint
	on the const overload as per LWG 3553.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-19  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_iterator.h
	(__detail::__common_iter_use_postfix_proxy): Add
	move_constructible constraint as per LWG 3546.
	(common_iterator::__postfix_proxy): Adjust initializer of
	_M_keep as per LWG 3546.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-18  Patrick Palka  <ppalka@redhat.com>

	* include/std/concepts (convertible_to): Just use declval as per
	LWG 3557.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-18  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_algo.h (__find_fn, find, __find_if_fn)
	(find_if, __find_if_not_fn, find_if_not, _in_in_result)
	(__mismatch_fn, mismatch, __search_fn, search): Move to ...
	* include/bits/ranges_util.h: ... here.
	* include/std/ranges (__detail::find, __detail::find_if)
	(__detail::find_if_not, __detail::mismatch): Remove.
	(filter_view): Use ranges::find_if instead.
	(drop_while_view): Use ranges::find_if_not instead.
	(split_view): Use ranges::find and ranges::mismatch instead.

2021-10-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-21  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100606
	* include/std/ranges (drop_while_view::begin): Assert the
	precondition added by LWG 3490.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/tuple/comparison_operators/overloaded.cc:
	Restore test for operator<.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101960
	* include/std/tuple (_Tuple_impl(_Tuple_impl&&)): Define as
	defauled.
	* testsuite/20_util/tuple/cons/101960.cc: Check tuples with
	array elements before the last element.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-05  Jonathan Wakely  <jwakely@redhat.com>

	PR c++/102535
	* testsuite/20_util/is_trivially_constructible/value.cc: Adjust
	expected value for C++20.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-08  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_filebuf/close/81256.cc: Moved to...
	* testsuite/27_io/basic_filebuf/close/wchar_t/81256.cc: ...here.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string_view/requirements/trivially_copyable.cc:
	New test.
	* testsuite/23_containers/span/trivially_copyable.cc: New test.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-11  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/numeric_limits/lowest.cc: Use
	numeric_limits<T>::is_integer instead of is_integral<T>::value.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101960
	* include/std/tuple (_Tuple_impl(_Tuple_impl&&)): Use base
	class' move constructor. Define as defaulted for versioned
	namespace.
	* testsuite/20_util/tuple/cons/101960.cc: New test.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-18  Jonathan Wakely  <jwakely@redhat.com>

	* include/debug/deque (deque(size_type, const T&, const A&)):
	Prevent class template argument deduction and replace with a
	deduction guide.
	* include/debug/forward_list (forward_list(size_type, const T&, const A&)):
	Likewise.
	* include/debug/list (list(size_type, const T&, const A&)):
	Likewise.
	* include/debug/vector (vector(size_type, const T&, const A&)):
	Likewise.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-16  Jonathan Wakely  <jwakely@redhat.com>

	* python/Makefile.am [GLIBCXX_BUILD_DEBUG] (install-data-local):
	Install another copy of the GDB hook.
	* python/Makefile.in: Regenerate.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101870
	* include/c_global/cmath (hypot): Use __promoted_t.
	(lerp): Add new overload accepting any arithmetic types.
	* include/ext/type_traits.h (__promoted_t): New alias template.
	* testsuite/26_numerics/lerp.cc: Moved to...
	* testsuite/26_numerics/lerp/1.cc: ...here.
	* testsuite/26_numerics/lerp/constexpr.cc: New test.
	* testsuite/26_numerics/lerp/version.cc: New test.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-17  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Define.
	(build_libstdcxx_dictionary): Register printer for
	std::error_code and std::error_condition.
	* testsuite/libstdc++-prettyprinters/cxx11.cc: Test it.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101923
	* include/bits/std_function.h (function(function&&)): Check for
	non-empty parameter before doing any work.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102425
	* src/c++11/system_error.cc
	(system_error_category::default_error_condition): Add 0 to
	switch.
	* testsuite/19_diagnostics/error_category/102425.cc: New test.

2021-10-12  Thomas Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2021-09-16  Thomas Rodgers  <rodgert@twrodgers.com>

	PR libstdc++/101761
	* testsuite/29_atomics/atomic_ref/wait_notify.cc (test): Use
	va and vb as arguments to wait/notify, remove unused bb local.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (advance): Remove non-deducible
	template parameter.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99876
	* src/c++17/fs_ops.cc (fs::absolute): Call non-throwing form,
	to avoid unnecessary current_path() call.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-31  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102074
	* include/bits/atomic_timed_wait.h (__timed_waiter_pool)
	[!_GLIBCXX_HAVE_PLATFORM_TIMED_WAIT]: Add missing return.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102270
	* include/std/tuple (_Tuple_impl): Add constexpr to constructor
	missed in previous patch.
	* testsuite/20_util/tuple/cons/102270.C: Moved to...
	* testsuite/20_util/tuple/cons/102270.cc: ...here.
	* testsuite/util/testsuite_allocator.h (SimpleAllocator): Add
	constexpr to constructor so it can be used for C++20 tests.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102270
	* include/std/tuple (_Head_base, _Tuple_impl): Add
	_GLIBCXX20_CONSTEXPR to allocator-extended constructors.
	(tuple<>::swap(tuple&)): Add _GLIBCXX20_CONSTEXPR.
	* testsuite/20_util/tuple/cons/102270.C: New test.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/valarray/dr630-3.C: Moved to...
	* testsuite/26_numerics/valarray/dr630-3.cc: ...here.
	* testsuite/27_io/basic_iostream/cons/16251.C: Moved to...
	* testsuite/27_io/basic_iostream/cons/16251.cc: ...here.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-09-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102280
	* include/std/span (span(Range&&)): Add constraint to deduction
	guide.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/25_algorithms/is_permutation/2.cc: Include <iterator>.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/integer_comparisons/greater.cc: New test.

2021-10-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-10-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/102667
	* include/bits/regex.h (match_result::empty()): Optimize by
	calling the base function directly.
	(match_results::end()): Check _Base_type::empty() not empty().
	* testsuite/28_regex/match_results/102667.C: New test.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101965
	* include/std/charconv (__to_chars_i): Remove redundant check.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/random/seed_seq/cons/range.cc: Check
	construction from input iterators.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100682
	* doc/xml/manual/debug_mode.xml: Update documentation about
	debug capability of std::array.
	* doc/html/*: Regenerate.
	* include/debug/array: New file.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h (basic_string::contains): Do not
	define for -std=gnu++20.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/semaphore_base.h: Include <exception> and <errno.h>.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h (seed_seq): Constrain initializer-list
	constructor.
	* include/bits/random.tcc (seed_seq): Add template parameter.
	* testsuite/26_numerics/random/seed_seq/cons/default.cc: Check
	for noexcept.
	* testsuite/26_numerics/random/seed_seq/cons/initlist.cc: Check
	constraints.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100285
	* include/experimental/socket (__basic_socket_impl::set_option)
	(__basic_socket_impl::get_option) [!_GLIBCXX_HAVE_SYS_SOCKET_H]:
	Just set error code.
	* testsuite/experimental/net/socket/socket_base.cc: CHeck
	for <sys/socket.h> not <socket.h>.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100180
	PR libstdc++/100286
	PR libstdc++/100351
	* testsuite/experimental/net/internet/address/v4/comparisons.cc:
	Use new effective-target keyword.
	* testsuite/experimental/net/internet/address/v4/cons.cc:
	Likewise.
	* testsuite/experimental/net/internet/address/v4/creation.cc:
	Likewise.
	* testsuite/experimental/net/internet/address/v4/members.cc:
	Likewise.
	* testsuite/experimental/net/internet/address/v6/members.cc:
	Likewise.
	* testsuite/experimental/net/internet/resolver/base.cc:
	Likewise.
	* testsuite/experimental/net/internet/resolver/ops/lookup.cc:
	Likewise.
	* testsuite/experimental/net/internet/resolver/ops/reverse.cc:
	Likewise.
	* testsuite/experimental/net/internet/socket/opt.cc:
	Likewise.
	* testsuite/experimental/net/internet/tcp.cc:
	Likewise.
	* testsuite/experimental/net/internet/udp.cc:
	Likewise.
	* testsuite/lib/libstdc++.exp (check_effective_target_net_ts_ip):
	New proc to check net_ts_ip et.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/internet (address_v6::bytes_type): Adjust
	formatting.
	(basic_endpoint): Define _M_is_v6() to put all checks for
	AF_INET6 in one place.
	(basic_endpoint::resize): Simplify.
	(operator==(const tcp&, const tcp&)): Add constexpr and noexcept.
	(operator!=(const tcp&, const tcp&)): Likewise.
	(operator==(const udp&, const udp&)): Likewise.
	(operator!=(const udp&, const udp&)): Likewise.
	* testsuite/experimental/net/internet/tcp.cc: New test.
	* testsuite/experimental/net/internet/udp.cc: New test.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100286
	* include/experimental/internet (resolver_errc, resolver_category())
	(make_error_code, make_error_condition): Define unconditionally,
	only make enumerators and use of gai_strerror depend on the
	availability of <netdb.h>.
	(address_v4::to_string): Use correct constant for string length.
	(address_v4::to_string, address_v6::to_string): Define
	unconditionally, throw if unsupported.
	(make_address_v4, make_address_v6): Define unconditionally.
	Return an error if unsupported.
	(tcp, udp, v6_only, unicast::hops, multicast::*): Define
	conditionally,
	* testsuite/experimental/net/internet/socket/opt.cc: Check for
	<netinet/in.h> and <netinet/tcp.h> before using types from
	namespace net::ip.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100285
	* include/experimental/internet (resolver_base::flags):
	Define overloaded operators as hidden friends.
	* include/experimental/socket (socket_base::message_flags):
	Likewise.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/internet (tcp::no_delay, v6_only)
	(unicast::hops, multicast::hops, multicast::enable_loopback):
	Change access of base class and static data members. Add
	using-declaration for __socket_crtp::operator=(_Tp).
	(multicast::__mcastopt): New type.
	(multicast::join_group, multicast::leave_group): Derive from
	__mcastopt for common implementation.
	* include/experimental/socket: Add comment.
	* testsuite/experimental/net/internet/socket/opt.cc: New test.
	* testsuite/experimental/net/socket/socket_base.cc: Check for
	protected constructor/destructor of socket_base. Check for
	explicit constructors of socket option classes.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/net.h (__socket_base): Add
	bool template parameter to allow BooleanSocketOption and
	IntegerSocketOption to have different __socket_base<int>
	base classes.
	(__socket_base<bool>): Adjust base class.
	(__socket_base<int>): Add partial specialization.
	(__socket_crtp::operator=(_Tp)): Add noexcept-specifier.
	* include/experimental/socket (socket_base::broadcast)
	(socket_base::debug, socket_base::do_not_route)
	(socket_base::keep_alive, socket_base::linger)
	(socket_base::out_of_band_inline)
	(socket_base::receive_buffer_size)
	(socket_base::receive_low_watermark)
	(socket_base::reuse_address, socket_base::send_buffer_size)
	(socket_base::send_low_watermark): Add using-declaration for
	__socket_crtp::operator=(_Tp).
	* testsuite/experimental/net/socket/socket_base.cc: Check
	properties of socket option types.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/internet (resolver_base::flags): Remove
	enumerators. Initialize constants directly with desired values.
	Make all operators constexpr and noexcept.
	* testsuite/experimental/net/internet/resolver/base.cc: Use
	__gnu_test::test_bitmask_values for bitmask type. Check
	construction and destruction is protected.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100180
	* include/experimental/io_context (io_context): Define
	dummy_pollfd type so that most member functions still compile
	without <poll.h> and struct pollfd.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/io_context (io_context::async_wait): Add
	comment.
	* include/experimental/socket (basic_socket::async_connect):
	Cast wait_type constant to int.
	(basic_datagram_socket::async_receive): Likewise.
	(basic_datagram_socket::async_receive_from): Likewise.
	(basic_datagram_socket::async_send): Likewise.
	(basic_datagram_socket::async_send_to): Likewise.
	(basic_stream_socket::async_receive): Likewise.
	(basic_stream_socket::async_send): Likewise. Use io_context
	parameter directly, instead of via an executor.
	(basic_socket_acceptor::async_accept): Likewise.

2021-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/socket (socket_base::shutdown_type):
	(socket_base::wait_type, socket_base::message_flags):
	Remove enumerators. Initialize constants directly with desired
	values.
	(socket_base::message_flags): Make all operators constexpr and
	noexcept.
	* testsuite/util/testsuite_common_types.h (test_bitmask_values):
	New test utility.
	* testsuite/experimental/net/socket/socket_base.cc: New test.

2021-08-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ranges (basic_istream_view): Add default template
	argument.
	* testsuite/std/ranges/istream_view.cc: Check it.

2021-08-19  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-19  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Move row  earlier in table.
	* doc/html/manual/status.html: Regenerate.

2021-08-19  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100139
	* doc/xml/manual/status_cxx2020.xml: Add P1739R4 to status table.
	* doc/html/manual/status.html: Regenerate.

2021-08-17  Thomas Schwinge  <thomas@codesourcery.com>

	Backported from master:
	2021-08-17  Thomas Schwinge  <thomas@codesourcery.com>

	* testsuite/lib/libstdc++.exp: Avoid illegal argument to verbose,
	continued.

2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101866
	* testsuite/experimental/random/randint.cc: Loop and retry if
	reseed() produces the same sequence.

2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101510
	* src/c++17/fs_ops.cc (fs::create_directories): Use status
	instead of symlink_status.
	* src/filesystem/ops.cc (fs::create_directories): Likewise.
	* testsuite/27_io/filesystem/operations/create_directories.cc:
	Check symlink to existing directory.
	* testsuite/27_io/filesystem/operations/create_directory.cc: Do
	not test with symlinks on Windows.
	* testsuite/experimental/filesystem/operations/create_directories.cc:
	Check symlink to existing directory.
	* testsuite/experimental/filesystem/operations/create_directory.cc:
	Do not test with symlinks on Windows.

2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101510
	* src/c++17/fs_ops.cc (create_dir): Adjust whitespace.
	* testsuite/27_io/filesystem/operations/create_directory.cc:
	Test creating directory with name of existing symlink to
	directory.
	* testsuite/experimental/filesystem/operations/create_directory.cc:
	Likewise.

2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101056
	* libsupc++/compare (compare_partial_order_fallback): Add
	constraint using reversed parameter order, as per LWG 3465.
	* testsuite/18_support/comparisons/algorithms/fallback.cc:
	Adjust expected result.

2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/compare (__decayed_same_as): New helper concept.
	(strong_order, weak_order, partial_order): Constrain with new
	concept instead of using static_assert.
	(compare_strong_order_fallback, compare_weak_order_fallback)
	(compare_partial_order_fallback): Likewise. Do not deduce return
	types. Remove redundant if-constexpr checks.
	* testsuite/18_support/comparisons/algorithms/fallback.cc: New test.

2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-01  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/doxygroups.cc: Fix docs for std::literals.
	* doc/doxygen/user.cfg.in: Exclude the Networking TS header.
	Add some more predefined macros.
	* include/bits/fs_fwd.h: Move @addtogroup commands inside
	namespaces. Add better documentation.
	* include/bits/fs_path.h: Likewise.
	* include/experimental/bits/fs_fwd.h: Likewise.
	* include/experimental/bits/fs_path.h: Likewise.
	* include/ext/throw_allocator.h: Fix typo and improve docs.
	* include/std/chrono: Move @addtogroup commands.
	* include/std/system_error: Move @addtogroup commands.
	* libsupc++/exception: Improve documentation.
	* libsupc++/exception.h: Add @since documentation.

2021-08-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101258
	* doc/doxygen/user.cfg.in (INPUT): Add <experimental/simd>.
	(COLS_IN_ALPHA_INDEX): Remove obsolete tag.
	(PREDEFINED): Add/fix some more macros that need to be expanded.
	* include/bits/random.h: Stop Doxygen from documenting internal
	implementation details.
	* include/bits/random.tcc: Likewise.
	* include/bits/this_thread_sleep.h: Fix @file name.
	* include/experimental/bits/simd.h: Add to Doxygen group. Do not
	document internal implementation details.
	* include/experimental/bits/simd_detail.h: Do not document
	internal implementation details.
	* include/experimental/simd: Define Doxygen groups.
	* include/experimental/type_traits: Improve documentation for
	the header file. Define groups. Use @since commands.
	* include/std/scoped_allocator (scoped_allocator_adaptor): Move
	declaration before undocumented region.
	* include/std/type_traits (true_type, false_type): Use using
	declaration instead of typedef.
	(is_invocable_v, is_nothrow_invocable_v, is_invocable_r_v)
	(is_nothrow_invocable_r_v): Move definitions next to other C++17
	variable templates.
	Do not document internal implementation details. Move misplaced
	group-end command. Define group for variable templates.
	* include/std/variant: Do not document internal implementation
	details.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line number.

2021-07-28  Release Manager

	* GCC 11.2.0 released.

2021-07-19  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc:
	Increase dg-timeout-factor to 4. Fix -Wunused-parameter
	warnings. Replace bitwise AND with logical AND in loop
	condition.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc:
	Replace bitwise AND with logical AND in loop condition.
	* testsuite/util/pstl/test_utils.h: Remove unused parameter
	names.

2021-07-19  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_util.h (subrange): Add __size_type typedef
	and use it to simplify declarations.
	(subrange(i, s, n)): Remove assertion.
	* testsuite/std/ranges/subrange/constexpr.cc: New test.

2021-07-19  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101427
	* include/std/tuple (tuple_element): Improve static_assert text.
	(__get_helper): Add deleted overload.
	(get<i>(tuple<T...>&&), get<i>(const tuple<T...>&&)): Use
	__get_helper directly.
	(__get_helper2): Remove.
	(__find_uniq_type_in_pack): New constexpr helper function.
	(get<T>): Use __find_uniq_type_in_pack and __get_helper instead
	of __get_helper2.
	* testsuite/20_util/tuple/element_access/get_neg.cc: Adjust
	expected errors.
	* testsuite/20_util/tuple/element_access/101427.cc: New test.

2021-07-16  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (__cust_access::__decay_copy):
	Replace with function object.
	(__cust_access::__member_begin, ___cust_access::_adl_begin): Use
	__decay_copy unqualified.
	* include/bits/ranges_base.h (__member_end, __adl_end):
	Likewise. Use __range_iter_t for type of ranges::begin.
	(__member_rend): Use correct value category for rbegin argument.
	(__member_data): Use __decay_copy unqualified.
	(__begin_data): Use __range_iter_t for type of ranges::begin.

2021-07-15  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_base.h (ranges::empty): Check whether
	conversion to bool can throw.
	* testsuite/std/ranges/access/empty.cc: Check for correct
	noexcept-specifier.

2021-07-15  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/simd: Do not define anything pre-C++17.

2021-07-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-13  Jonathan Wakely  <jwakely@redhat.com>

	PR c++/101361
	* include/std/string_view (ends_with): Use traits_type::compare
	directly.

2021-07-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/string_view: Only include <bits/ranges_base.h>
	once, and only for C++20 and later.

2021-07-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-07-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101411
	* include/std/span (as_writable_bytes): Add requires-clause.
	* testsuite/23_containers/span/101411.cc: New test.

2021-07-13  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100387
	* include/bits/ranges_algo.h (__minmax_fn::operator()): Rewrite
	to limit comparison complexity to 3*N/2.
	(__minmax_element_fn::operator()): Likewise.
	(shift_right): Avoid premature std::move of __result.
	* testsuite/25_algorithms/minmax/constrained.cc (test04, test05):
	New tests.
	* testsuite/25_algorithms/minmax_element/constrained.cc (test02):
	Likewise.

2021-06-22  Thomas Rodgers  <rodgert@appliantology.com>

	Backported from master:
	2021-06-22  Thomas Rodgers  <rodgert@appliantology.com>

	PR libstdc++/100806
	* include/bits/semaphore_base.h (__atomic_semaphore::_M_release):
	Force _M_release() to wake all waiting threads.
	* testsuite/30_threads/semaphore/100806.cc: New test.

2021-06-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95833
	* include/std/numeric (reduce(Iter, Iter, T, BinaryOp)): Replace
	incorrect static_assert with ones matching the 'Mandates'
	conditions in the standard.
	* testsuite/26_numerics/reduce/95833.cc: New test.

2021-06-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-18  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/cons/char/1.cc: Use
	diagnostic pragma to suppress -Wstringop-overread error.

2021-06-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91488
	* include/bits/basic_string.h (__cpp_lib_constexpr_string): Only
	define C++20 value when std::is_constant_evaluated is available.
	* include/bits/char_traits.h (__cpp_lib_constexpr_char_traits):
	Likewise.
	(__constant_string_p, __constant_array_p): Give external
	linkage.
	* include/std/version (__cpp_lib_constexpr_char_traits)
	(__cpp_lib_constexpr_string): Only define C++20 values when
	is_constant_evaluated is available.

2021-06-18  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-17  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100940
	* include/std/ranges (__adaptor::_Partial): For the "simple"
	forwarding partial specializations, also require that
	the extra arguments are trivially copyable.
	* testsuite/std/ranges/adaptors/100577.cc (test04): New test.

2021-06-18  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-17  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100940
	* include/std/ranges (__adaptor::_RangeAdaptor): Document the
	template form of _S_has_simple_extra_args.
	(__adaptor::__adaptor_has_simple_extra_args): Add _Args template
	parameter pack.  Try to treat _S_has_simple_extra_args as a
	variable template parameterized by _Args.
	(__adaptor::_Partial): Pass _Arg/_Args to the constraint
	__adaptor_has_simple_extra_args.
	(views::_Take::_S_has_simple_extra_args): Templatize according
	to the type of the extra argument.
	(views::_Drop::_S_has_simple_extra_args): Likewise.
	(views::_Split::_S_has_simple_extra_args): Define.
	* testsuite/std/ranges/adaptors/100577.cc (test01, test02):
	Adjust after changes to _S_has_simple_extra_args mechanism.
	(test03): Define.

2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100894
	* include/std/type_traits (__common_ref_impl<X&, Y&>): Only
	use the type if it's a reference.
	* testsuite/20_util/common_reference/100894.cc: New test.

2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.tcc (__representable_as_double)
	(__p1_representable_as_double): Add "" to static asserts.

2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/filesystem/path/native/conv_c++23.cc:
	Add dg-require-filesystem-ts directive.

2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101034
	* include/std/any (any(in_place_t<T>, initializer_list<U>, A&&...))
	(any::emplace<T>(initializer_list<U>, A&&...)): Fix constraint
	to use lvalue.
	* testsuite/20_util/any/cons/101034.cc: New test.

2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/headers/c++2017/all_attributes.cc: Add
	-std=gnu++17 option.

2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/101055
	* include/std/tuple: Use reserved form of attribute name.
	* testsuite/17_intro/headers/c++2011/all_attributes.cc: Add
	check for no_unique_address.
	* testsuite/17_intro/headers/c++2014/all_attributes.cc:
	Likewise.
	* testsuite/17_intro/headers/c++2017/all_attributes.cc:
	Likewise.

2021-06-14  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100475
	* include/std/ranges (__box::__box): Use non-list-initialization
	in member initializer list of in-place constructor of the
	partial specialization for semiregular types.
	(__box::operator->): Use std::__addressof.
	* testsuite/std/ranges/adaptors/detail/semiregular_box.cc
	(test02): New test.
	* testsuite/std/ranges/single_view.cc (test04): New test.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (operator==, operator<=>): Use new
	_S_compare function.
	(path::_S_compare): New function to call path::compare in a
	context where path::iterator is complete.
	* include/experimental/bits/fs_path.h (operator<, operator==):
	Define after path::iterator is complete.
	* testsuite/27_io/filesystem/path/native/conv_c++23.cc: New
	test.
	* testsuite/experimental/filesystem/path/native/conv_c++23.cc:
	New test.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/propagate_const (swap): Constrain.
	* testsuite/experimental/propagate_const/swap/lwg3413.cc: New test.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100982
	* include/std/optional (optional::operator=(const optional<U>&)):
	Fix value category used in is_assignable check.
	* testsuite/20_util/optional/assignment/100982.cc: New test.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98842
	* include/std/optional (operator<=>(const optional<T>& const U&)):
	Add missing constraint and add workaround for template
	recursion.
	* testsuite/20_util/optional/relops/three_way.cc: Check that
	type without equality comparison cannot be compared when wrapped
	in std::optional.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100824
	* include/bits/ranges_base.h (_SSize): Return signed type.
	* testsuite/std/ranges/access/ssize.cc: Check with __int128.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_base.h (_SSize): Return the result of
	ranges::size converted to the wider of make-signed-like-t<S> and
	ptrdiff_t, rather than the ranges different type.
	* testsuite/std/ranges/access/ssize.cc: Adjust expected result
	for an iota_view that uses an integer class type for its
	difference_type.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100824
	* include/bits/ranges_base.h (__member_data): Use __decay_copy.
	* testsuite/std/ranges/access/data.cc: Add testcase from PR.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100824
	* include/bits/iterator_concepts.h (__detail::__decay_copy)
	(__detail::__member_begin, __detail::__adl_begin): Move to
	namespace ranges::__cust_access.
	(__detail::__ranges_begin): Likewise, and rename to __begin.
	Remove redundant static assertion.
	* include/bits/ranges_base.h (_Begin, _End, _RBegin, _REnd):
	Use lvalue in noexcept specifier.
	(__as_const): Add non-deduced parameter for value category.
	(_CBegin, _CEnd, _CRBegin, _CREnd, _CData): Adjust uses of
	__as_const.
	(__member_size, __adl_size, __member_empty, __size0_empty):
	(__eq_iter_empty, __adl_data): Use lvalue objects in
	requirements.
	(__sentinel_size): Likewise. Add check for conversion to
	unsigned-like.
	(__member_data): Allow non-lvalue types to satisfy the concept,
	but use lvalue object in requirements.
	(_Size, _SSize): Remove forwarding to always use an lvalue.
	(_Data): Likewise. Add static assertion for arrays.
	* testsuite/std/ranges/access/cdata.cc: Adjust expected
	behaviour for rvalues. Add negative tests for ill-formed
	expressions.
	* testsuite/std/ranges/access/data.cc: Likewise.
	* testsuite/std/ranges/access/empty.cc: Adjust expected
	behaviour for rvalues.
	* testsuite/std/ranges/access/size.cc: Likewise.

2021-06-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-04  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml:
	* doc/html/*: Regenerate.
	* include/bits/hashtable.h (__cpp_lib_generic_unordered_lookup):
	Define.
	* include/std/version (__cpp_lib_generic_unordered_lookup):
	Define.
	* testsuite/23_containers/unordered_map/operations/1.cc: Check
	feature test macro.
	* testsuite/23_containers/unordered_set/operations/1.cc:
	Likewise.

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-03  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100577
	* include/std/ranges (_RangeAdaptorClosure): Document
	_S_has_simple_call_op mechanism.
	(_RangeAdaptor): Document _S_has_simple_extra_args mechanism.
	(__closure_has_simple_call_op): New concept.
	(__adaptor_has_simple_extra_args): Likewise.
	(_Partial<_Adaptor, _Args...>): New partial specialization.
	(_Partial<_Adaptor, _Arg>): Likewise.
	(_Pipe<_Lhs, _Rhs>): Likewise.
	(views::_All::_S_has_simple_call_op): Define to true.
	(views::_Filter::_S_has_simple_extra_args): Likewise.
	(views::_Transform::_S_has_simple_extra_args): Likewise.
	(views::_Take::_S_has_simple_extra_args): Likewise.
	(views::_TakeWhile::_S_has_simple_extra_args): Likewise.
	(views::_Drop::_S_has_simple_extra_args): Likewise.
	(views::_DropWhile::_S_has_simple_extra_args): Likewise.
	(views::_Join::_S_has_simple_call_op): Likewise.
	(views::_Split): Document why we don't define
	_S_has_simple_extra_args to true for this adaptor.
	(views::_Common::_S_has_simple_call_op): Define to true.
	(views::_Reverse::_S_has_simple_call_op): Likewise.
	(views::_Elements::_S_has_simple_call_op): Likewise.
	* testsuite/std/ranges/adaptors/100577.cc: New test.

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-06-03  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100770
	* include/bits/ranges_algo.h (__detail::__can_reread_output):
	Factor out this concept from ...
	(__unique_copy_fn::operator()): ... here.  Use the concept
	throughout.
	* testsuite/std/ranges/range.cc: Remove now ill-formed use
	of range_value_t on an output_range.
	* testsuite/util/testsuite_iterators.h (output_iterator_wrapper):
	Define value_type, pointer and reference member types to void.

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-21  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100690
	* include/std/ranges (iota_view::_Sentinel::_M_distance_from):
	Split out this member function from ...
	(iota_view::_Sentinel::operator-): ... here, for sake of access
	control.
	* testsuite/std/ranges/iota/iota_view.cc (test05): New test.

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-06  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (filter_view::_Iterator::base): Make the
	const& overload unconstrained and return a const reference as
	per LWG 3533.  Make unconditionally noexcept.
	(transform_view::_Iterator::base): Likewise.
	(elements_view::_Iterator::base): Likewise.

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-06  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_iterator.h (move_iterator::base): Make the
	const& overload unconstrained and return a const reference as
	per LWG 3391.  Make unconditionally noexcept.
	(counted_iterator::base): Likewise.
	* testsuite/24_iterators/move_iterator/lwg3391.cc: New test.
	* testsuite/24_iterators/move_iterator/move_only.cc: Adjust
	has_member_base concept to decay-copy the result of base().

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100631
	* include/std/ranges (elements_view::_Sentinel::operator-): Use
	_M_distance_from in the other operator- overload too.
	* testsuite/std/ranges/adaptors/elements.cc (test06): Augment test.

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-18  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100631
	* include/std/ranges (elements_view::_Iterator): Also befriend
	_Sentinel<!_Const>.
	(elements_view::_Sentinel::_M_equal): Templatize.
	(elements_view::_Sentinel::_M_distance_from): Split out from ...
	(elements_view::_Sentinel::operator-): ... here.  Depend on
	_Base2 instead of _Base in the return type.
	* testsuite/std/ranges/adaptors/elements.cc (test06, test07):
	New tests.

2021-06-10  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-20  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100639
	* include/bits/stl_iterator.h (reverse_iterator::difference_type):
	In C++20 mode, define in terms of iter_difference_t as per P0896R4.
	(reverse_iterator::reference): Likewise, but with iter_reference_t.
	(reverse_iterator::value_type): Likewise, but with iter_value_t.
	* testsuite/std/ranges/adaptors/reverse.cc (test08): New test.
	* testsuite/24_iterators/reverse_iterator/100639.cc: New test.

2021-06-09  Thomas Rodgers  <rodgert@appliantology.com>

	Backported from master:
	2021-06-09  Thomas Rodgers  <rodgert@appliantology.com>

	* testsuite/29_atomics/atomic_ref/wait_notify.cc: Guard
	test logic with constexpr check for is_always_lock_free.

2021-06-08  Thomas Rodgers  <rodgert@appliantology.com>

	Backported from master:
	2021-06-08  Thomas Rodgers  <rodgert@appliantology.com>

	PR libstdc++/100889
	* include/bits/atomic_base.h (atomic_ref<_Tp*>::wait):
	Change parameter type from _Tp to _Tp*.
	* testsuite/29_atomics/atomic_ref/wait_notify.cc: Extend
	coverage of types tested.

2021-06-08  Thomas Rodgers  <rodgert@appliantology.com>

	Backported from master:
	2021-06-08  Thomas Rodgers  <rodgert@appliantology.com>

	* include/std/barrier (__tree_barrier::_M_arrive): Remove
	unnecessary hasher instantiation.

2021-06-07  Avi Kivity  <avi@scylladb.com>

	Backported from master:
	2021-06-07  Avi Kivity  <avi@scylladb.com>

	PR libstdc++/100900
	* include/std/ranges (elements_view::__iter_cat::_S_iter_cat):
	Add missing typename.

2021-06-02  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100676
	* include/bits/c++config (__glibcxx_assert_1): Rename to ...
	(__glibcxx_constexpr_assert): ... this.
	(__glibcxx_assert_impl): Use __glibcxx_constexpr_assert.
	(__glibcxx_assert): Define as either __glibcxx_constexpr_assert
	or __glibcxx_assert_impl.
	(__glibcxx_assert_2): Remove
	* include/debug/macros.h (_GLIBCXX_DEBUG_VERIFY_AT_F): Use
	__glibcxx_constexpr_assert instead of __glibcxx_assert_1.
	* testsuite/21_strings/basic_string_view/element_access/char/back_constexpr_neg.cc:
	Adjust expected error.
	* testsuite/21_strings/basic_string_view/element_access/char/constexpr_neg.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/front_constexpr_neg.cc:
	Likewise.
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/back_constexpr_neg.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr_neg.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/front_constexpr_neg.cc:
	Likewise.
	* testsuite/23_containers/span/back_neg.cc: Likewise.
	* testsuite/23_containers/span/front_neg.cc: Likewise.
	* testsuite/23_containers/span/index_op_neg.cc: Likewise.

2021-06-02  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100833
	* include/bits/ranges_base.h (ranges::advance(iter, n, sentinel)):
	Fix return value for no-op case.
	* testsuite/24_iterators/range_operations/advance.cc: Test
	return values of three-argument overload.

2021-06-02  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100768
	* include/bits/ranges_base.h (advance, distance, next, prev):
	Replace function templates with function objects.
	* testsuite/24_iterators/headers/iterator/synopsis_c++20.cc:
	Adjust for changes to function objects.
	* testsuite/std/ranges/adaptors/elements.cc: Add using
	declarations for names from namespace ranges.
	* testsuite/std/ranges/adaptors/transform.cc: Likewise.
	* testsuite/24_iterators/range_operations/100768.cc: New test.

2021-06-02  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-06-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99453
	* python/Makefile.am: Use archive name for printer hook if no
	dynamic library name is available.
	* python/Makefile.in: Regenerate.

2021-05-28  David Edelsohn  <dje.gcc@gmail.com>

	Backported from master:
	2021-04-24  David Edelsohn  <dje.gcc@gmail.com>

	* testsuite/lib/dg-options.exp (atomic_link_flags): New.
	(add_options_for_libatomic): Use atomic_link_flags.

2021-05-28  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-04-30  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (__detail::__non_propating_cache): Define
	as per P2328.
	(join_view): Remove constraints on the value and reference types
	of the wrapped iterator type as per P2328.
	(join_view::_Iterator::_M_satisfy): Adjust as per P2328.
	(join_view::_Iterator::operator++): Likewise.
	(join_view::_M_inner): Use __non_propating_cache as per P2328.
	Remove now-redundant use of __maybe_present_t.
	* testsuite/std/ranges/adaptors/join.cc: Include <array>.
	(test10): New test.

2021-05-28  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-24  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100479
	* include/std/ranges (__detail::__non_propagating_cache): Move
	definition up to before that of _CachedPosition.  Make base
	class _Optional_base protected instead of private.  Add const
	overload for operator*.
	(__detail::_CachedPosition): Rewrite the partial specialization
	for forward ranges as a derived class of __non_propagating_cache.
	Remove the size constraint on the partial specialization for
	random access ranges.  Add copy/move/copy-assignment/move-assignment
	members to the offset partial specialization for random
	access ranges that propagate the cached value but additionally
	invalidate it in the source object on move.
	* testsuite/std/ranges/adaptors/100479.cc: New test.

2021-05-20  Joern Rennecke  <joern.rennecke@riscy-ip.com>

	PR libstdc++/100361
	* include/std/charconv (to_chars): Hide the overloads for
	floating-point types for 16 bit targets.
	* src/c++17/floating_to_chars.cc: Don't compile for 16 bit targets.
	* testsuite/20_util/to_chars/double.cc: Run this test only on
	size32plus targets.
	* testsuite/20_util/to_chars/float.cc: Likewise.
	* testsuite/20_util/to_chars/long_double.cc: Likewise.

2021-05-17  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-17  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100630
	* include/experimental/bits/fs_path.h (__is_constructible_from):
	Test construction from a const lvalue, not an rvalue.
	* testsuite/27_io/filesystem/path/construct/100630.cc: New test.
	* testsuite/experimental/filesystem/path/construct/100630.cc:
	New test.

2021-05-17  Thomas Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2021-05-17  Thomas Rodgers  <rodgert@twrodgers.com>

	* include/bits/atomic_wait.h (__waiter::_M_do_wait_v): loop
	until value change observed.
	(__waiter_base::_M_laundered): New member.
	(__waiter_base::_M_notify): Check _M_laundered to determine
	whether to wake one or all.
	(__detail::__atomic_compare): Return true if call to
	__builtin_memcmp() == 0.
	(__waiter_base::_S_do_spin_v): Adjust predicate.
	* testsuite/29_atomics/atomic/wait_notify/100334.cc: New
	test.

2021-05-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-04-30  Patrick Palka  <ppalka@redhat.com>

	* include/bits/ranges_util.h (subrange::subrange): Avoid
	list-initialization in delegating constructor.
	* include/std/ranges (single_view): Replace implicit guide
	with explicit deduction guide that decays its argument.
	(_Single::operator()): Avoid CTAD when constructing the
	single_view object.
	(_Iota::operator()): Avoid list-initialization.
	(__detail::__can_filter_view, _Filter::operator()): Likewise.
	(__detail::__can_transform_view, _Transform::operator()): Likewise.
	(take_view::begin): Likewise.
	(__detail::__can_take_view, _Take::operator()): Likewise.
	(__detail::__can_take_while_view, _TakeWhile::operator()): Likewise.
	(__detail::__can_drop_view, _Drop::operator()): Likewise.
	(__detail::__can_drop_while_view, _DropWhile::operator()): Likewise.
	(split_view::split_view): Use views::single when initializing
	_M_pattern.
	(__detail::__can_split_view, _Split::operator()): Avoid
	list-initialization.
	(_Counted::operator()): Likewise.
	* testsuite/std/ranges/p2367.cc: New test.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/headers/memory/synopsis.cc: Define C++98
	alternative for macro.
	* testsuite/20_util/shared_ptr/creation/99006.cc: Add effective
	target keyword.
	* testsuite/25_algorithms/copy/debug/99402.cc: Avoid C++11
	syntax.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/allocator.h (allocator<void>) [C++20]: Add
	missing noexcept to constructor. Restore missing POCMA and
	is_always_equal_traits.
	[C++17]: Make construct and destroy members private and
	declare allocator_traits as a friend.
	* include/bits/memoryfwd.h (allocator_traits): Declare.
	* include/ext/malloc_allocator.h (malloc_allocator::allocate):
	Add nodiscard attribute. Add static assertion for LWG 3307.
	* include/ext/new_allocator.h (new_allocator::allocate): Add
	static assertion for LWG 3307.
	* testsuite/20_util/allocator/void.cc: Check that converting
	constructor is noexcept. Check for propagation traits and
	size_type and difference_type. Check that pointer and
	const_pointer are gone in C++20.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stop_token: Remove TODO comment.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_base.h (__shared_count(unique_ptr&&)):
	Initialize a non-reference deleter from an rvalue, as per LWG
	3548.
	(__shared_ptr::_UniqCompatible): Add missing constraint.
	* testsuite/20_util/shared_ptr/cons/lwg3548.cc: New test.
	* testsuite/20_util/shared_ptr/cons/unique_ptr_deleter.cc: Check
	constraints.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/headers/c++2017/all_attributes.cc: Remove
	-std=gnu++17 from dg-options directive.
	* testsuite/17_intro/headers/c++2017/all_no_exceptions.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/parallel_mode.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/aligned_alloc/aligned_alloc.cc: Likewise.
	* testsuite/18_support/byte/81076.cc: Likewise.
	* testsuite/18_support/byte/global_neg.cc: Likewise.
	* testsuite/18_support/byte/ops.cc: Likewise.
	* testsuite/18_support/byte/requirements.cc: Likewise.
	* testsuite/18_support/headers/cfloat/values_c++17.cc: Likewise.
	* testsuite/18_support/launder/1.cc: Likewise.
	* testsuite/18_support/launder/nodiscard.cc: Likewise.
	* testsuite/18_support/launder/requirements.cc: Likewise.
	* testsuite/18_support/launder/requirements_neg.cc: Likewise.
	* testsuite/18_support/new_aligned.cc: Likewise.
	* testsuite/18_support/uncaught_exceptions/uncaught_exceptions.cc:
	Likewise.
	* testsuite/19_diagnostics/error_code/is_error_code_v.cc:
	Likewise.
	* testsuite/19_diagnostics/error_condition/hash.cc: Likewise.
	* testsuite/20_util/addressof/requirements/constexpr.cc:
	Likewise.
	* testsuite/20_util/as_const/1.cc: Likewise.
	* testsuite/20_util/as_const/rvalue_neg.cc: Likewise.
	* testsuite/20_util/bind/83427.cc: Likewise.
	* testsuite/20_util/bind/is_placeholder_v.cc: Likewise.
	* testsuite/20_util/bool_constant/requirements.cc: Likewise.
	* testsuite/20_util/duration/arithmetic/constexpr_c++17.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/from_chars/1_neg.cc: Likewise.
	* testsuite/20_util/from_chars/requirements.cc: Likewise.
	* testsuite/20_util/function/91456.cc: Likewise.
	* testsuite/20_util/function/cons/deduction.cc: Likewise.
	* testsuite/20_util/function_objects/83607.cc: Likewise.
	* testsuite/20_util/function_objects/invoke/59768.cc: Likewise.
	* testsuite/20_util/function_objects/mem_fn/80478.cc: Likewise.
	* testsuite/20_util/function_objects/not_fn/1.cc: Likewise.
	* testsuite/20_util/function_objects/not_fn/87538.cc: Likewise.
	* testsuite/20_util/has_unique_object_representations/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/has_unique_object_representations/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/has_unique_object_representations/value.cc:
	Likewise.
	* testsuite/20_util/hash/nullptr.cc: Likewise.
	* testsuite/20_util/in_place/requirements.cc: Likewise.
	* testsuite/20_util/is_aggregate/incomplete_neg.cc: Likewise.
	* testsuite/20_util/is_aggregate/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/20_util/is_aggregate/requirements/typedefs.cc:
	Likewise.
	* testsuite/20_util/is_aggregate/value.cc: Likewise.
	* testsuite/20_util/is_invocable/83395.cc: Likewise.
	* testsuite/20_util/is_invocable/91456.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_literal_type/deprecated-1z.cc: Likewise.
	* testsuite/20_util/is_nothrow_constructible/94003.cc: Likewise.
	* testsuite/20_util/is_nothrow_invocable/83395.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_invocable/value.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/83134.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/pair/cons/deduction.cc: Likewise.
	* testsuite/20_util/pair/swap_cxx17.cc: Likewise.
	* testsuite/20_util/ratio/requirements/ratio_equal_v.cc:
	Likewise.
	* testsuite/20_util/reference_wrapper/83427.cc: Likewise.
	* testsuite/20_util/reference_wrapper/deduction.cc: Likewise.
	* testsuite/20_util/shared_ptr/casts/reinterpret.cc: Likewise.
	* testsuite/20_util/shared_ptr/cons/deduction.cc: Likewise.
	* testsuite/20_util/shared_ptr/requirements/weak_type.cc:
	Likewise.
	* testsuite/20_util/time_point/arithmetic/constexpr.cc:
	Likewise.
	* testsuite/20_util/time_point_cast/rounding.cc: Likewise.
	* testsuite/20_util/to_chars/3.cc: Likewise.
	* testsuite/20_util/to_chars/chars_format.cc: Likewise.
	* testsuite/20_util/to_chars/lwg3266.cc: Likewise.
	* testsuite/20_util/to_chars/requirements.cc: Likewise.
	* testsuite/20_util/tuple/78939.cc: Likewise.
	* testsuite/20_util/tuple/apply/1.cc: Likewise.
	* testsuite/20_util/tuple/apply/2.cc: Likewise.
	* testsuite/20_util/tuple/cons/deduction.cc: Likewise.
	* testsuite/20_util/tuple/make_from_tuple/1.cc: Likewise.
	* testsuite/20_util/tuple/make_from_tuple/2.cc: Likewise.
	* testsuite/20_util/tuple/swap_cxx17.cc: Likewise.
	* testsuite/20_util/tuple/tuple_size_v.cc: Likewise.
	* testsuite/20_util/unique_ptr/cons/deduction_neg.cc: Likewise.
	* testsuite/20_util/uses_allocator/requirements/uses_allocator_v.cc:
	Likewise.
	* testsuite/20_util/variable_templates_for_traits.cc: Likewise.
	* testsuite/20_util/void_t/1.cc: Likewise.
	* testsuite/20_util/weak_ptr/cons/deduction.cc: Likewise.
	* testsuite/24_iterators/container_access.cc: Likewise.
	* testsuite/24_iterators/headers/iterator/range_access_c++17.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/synopsis_c++17.cc:
	Likewise.
	* testsuite/24_iterators/range_access/range_access_cpp17.cc:
	Likewise.
	* testsuite/24_iterators/range_access/range_access_cpp17_neg.cc:
	Likewise.
	* testsuite/26_numerics/gcd/gcd_neg.cc: Likewise.
	* testsuite/26_numerics/headers/cmath/functions_std_c++17.cc:
	Likewise.
	* testsuite/26_numerics/headers/cmath/hypot.cc: Likewise.
	* testsuite/26_numerics/headers/cmath/special_functions_global.cc:
	Likewise.
	* testsuite/26_numerics/lcm/1.cc: Likewise.
	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.
	* testsuite/26_numerics/valarray/deduction.cc: Likewise.
	* testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc:
	Likewise.
	* testsuite/27_io/manipulators/standard/char/quoted_sv.cc:
	Likewise.
	* testsuite/27_io/manipulators/standard/wchar_t/quoted_sv.cc:
	Likewise.
	* testsuite/27_io/types/4.cc: Likewise.
	* testsuite/28_regex/basic_regex/ctors/deduction.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/91997.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/cxx17.cc: Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/function_objects/searchers.cc: Remove
	-std=gnu++17 from dg-options directive.
	* testsuite/20_util/specialized_algorithms/memory_management_tools/1.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/memory_management_tools/destroy_neg.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct/94540.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct/94831.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct_n/94540.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct_n/sizes.cc:
	Likewise.
	* testsuite/20_util/unique_ptr/specialized_algorithms/swap_cxx17.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/25_algorithms/for_each/for_each_n.cc: Likewise.
	* testsuite/25_algorithms/for_each/for_each_n_debug.cc:
	Likewise.
	* testsuite/25_algorithms/sample/1.cc: Likewise.
	* testsuite/25_algorithms/sample/2.cc: Likewise.
	* testsuite/25_algorithms/sample/3.cc: Likewise.
	* testsuite/25_algorithms/sample/81221.cc: Likewise.
	* testsuite/25_algorithms/search/searcher.cc: Likewise.
	* testsuite/26_numerics/exclusive_scan/1.cc: Likewise.
	* testsuite/26_numerics/inclusive_scan/1.cc: Likewise.
	* testsuite/26_numerics/reduce/1.cc: Likewise.
	* testsuite/26_numerics/reduce/2.cc: Likewise.
	* testsuite/26_numerics/transform_exclusive_scan/1.cc: Likewise.
	* testsuite/26_numerics/transform_inclusive_scan/1.cc: Likewise.
	* testsuite/26_numerics/transform_reduce/1.cc: Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/array/cons/deduction.cc: Remove
	-std=gnu++17 from dg-options directive.
	* testsuite/23_containers/array/cons/deduction_neg.cc: Likewise.
	* testsuite/23_containers/array/element_access/constexpr_c++17.cc:
	Likewise.
	* testsuite/23_containers/array/requirements/constexpr_iter.cc:
	Likewise.
	* testsuite/23_containers/array/specialized_algorithms/swap_cxx17.cc:
	Likewise.
	* testsuite/23_containers/deque/cons/deduction.cc: Likewise.
	* testsuite/23_containers/deque/modifiers/emplace/cxx17_return.cc:
	Likewise.
	* testsuite/23_containers/forward_list/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/forward_list/modifiers/emplace_cxx17_return.cc:
	Likewise.
	* testsuite/23_containers/list/cons/deduction.cc: Likewise.
	* testsuite/23_containers/list/modifiers/emplace/cxx17_return.cc:
	Likewise.
	* testsuite/23_containers/map/cons/deduction.cc: Likewise.
	* testsuite/23_containers/map/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/map/modifiers/insert/83226.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/cons/deduction.cc: Likewise.
	* testsuite/23_containers/multimap/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/multimap/modifiers/merge.cc: Likewise.
	* testsuite/23_containers/multiset/cons/deduction.cc: Likewise.
	* testsuite/23_containers/multiset/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/multiset/modifiers/merge.cc: Likewise.
	* testsuite/23_containers/priority_queue/deduction.cc: Likewise.
	* testsuite/23_containers/queue/deduction.cc: Likewise.
	* testsuite/23_containers/queue/members/emplace_cxx17_return.cc:
	Likewise.
	* testsuite/23_containers/set/cons/deduction.cc: Likewise.
	* testsuite/23_containers/set/modifiers/extract.cc: Likewise.
	* testsuite/23_containers/set/modifiers/merge.cc: Likewise.
	* testsuite/23_containers/set/modifiers/node_swap.cc: Likewise.
	* testsuite/23_containers/stack/deduction.cc: Likewise.
	* testsuite/23_containers/stack/members/emplace_cxx17_return.cc:
	Likewise.
	* testsuite/23_containers/unordered_map/cons/deduction.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/cons/deduction.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/cons/deduction.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/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/modifiers/extract.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/modifiers/merge.cc:
	Likewise.
	* testsuite/23_containers/vector/bool/emplace_cxx17_return.cc:
	Likewise.
	* testsuite/23_containers/vector/cons/89164_c++17.cc: Likewise.
	* testsuite/23_containers/vector/cons/deduction.cc: Likewise.
	* testsuite/23_containers/vector/modifiers/emplace/cxx17_return.cc:
	Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/79162.cc: Remove
	-std=gnu++17 from dg-options directive.
	* testsuite/21_strings/basic_string/cons/char/7.cc: Likewise.
	* testsuite/21_strings/basic_string/cons/char/79162.cc:
	Likewise.
	* testsuite/21_strings/basic_string/cons/char/86138.cc:
	Likewise.
	* testsuite/21_strings/basic_string/cons/char/9.cc: Likewise.
	* testsuite/21_strings/basic_string/cons/char/deduction.cc:
	Likewise.
	* testsuite/21_strings/basic_string/cons/char/moveable2_c++17.cc:
	Likewise.
	* testsuite/21_strings/basic_string/cons/wchar_t/7.cc: Likewise.
	* testsuite/21_strings/basic_string/cons/wchar_t/79162.cc:
	Likewise.
	* testsuite/21_strings/basic_string/cons/wchar_t/86138.cc:
	Likewise.
	* testsuite/21_strings/basic_string/cons/wchar_t/9.cc: Likewise.
	* testsuite/21_strings/basic_string/cons/wchar_t/deduction.cc:
	Likewise.
	* testsuite/21_strings/basic_string/cons/wchar_t/moveable2_c++17.cc:
	Likewise.
	* testsuite/21_strings/basic_string/hash/hash.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/char/86169.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/capacity/empty_neg.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/char/nonnull.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/cons/wchar_t/nonnull.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/back_constexpr_neg.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/constexpr.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/constexpr_neg.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/char/front_back_constexpr.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/char/front_constexpr_neg.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/back_constexpr_neg.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/element_access/wchar_t/constexpr_neg.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/element_access/wchar_t/front_constexpr_neg.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/include.cc: Likewise.
	* testsuite/21_strings/basic_string_view/inserters/94051.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/modifiers/swap/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/modifiers/swap/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/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/char/70483.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/compare/char/nonnull.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/compare/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/copy/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/copy/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/copy/wchar_t/2.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/char/nonnull.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/char/nonnull.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/char/83511.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/substr/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operations/substr/wchar_t/83511.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operators/char/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operators/char/89446.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operators/wchar_t/2.cc:
	Likewise.
	* testsuite/21_strings/basic_string_view/operators/wchar_t/89446.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/traits_neg.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/21_strings/char_traits/requirements/char/99181.cc:
	Likewise.
	* testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc:

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/memory_resource/1.cc: Remove -std=gnu++17
	from dg-options directive.
	* testsuite/20_util/memory_resource/2.cc: Likewise.
	* testsuite/20_util/monotonic_buffer_resource/1.cc: Likewise.
	* testsuite/20_util/monotonic_buffer_resource/93208.cc:
	Likewise.
	* testsuite/20_util/monotonic_buffer_resource/allocate.cc:
	Likewise.
	* testsuite/20_util/monotonic_buffer_resource/deallocate.cc:
	Likewise.
	* testsuite/20_util/monotonic_buffer_resource/release.cc:
	Likewise.
	* testsuite/20_util/monotonic_buffer_resource/upstream_resource.cc:
	Likewise.
	* testsuite/20_util/polymorphic_allocator/1.cc: Likewise.
	* testsuite/20_util/polymorphic_allocator/construct_pair.cc:
	Likewise.
	* testsuite/20_util/polymorphic_allocator/resource.cc: Likewise.
	* testsuite/20_util/polymorphic_allocator/select.cc: Likewise.
	* testsuite/20_util/synchronized_pool_resource/allocate.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/allocate_single.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/cons.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/cons_single.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/is_equal.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/multithreaded.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/options.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/release.cc:
	Likewise.
	* testsuite/20_util/synchronized_pool_resource/release_single.cc:
	Likewise.
	* testsuite/20_util/unsynchronized_pool_resource/allocate-max-chunks.cc:
	Likewise.
	* testsuite/20_util/unsynchronized_pool_resource/allocate.cc:
	Likewise.
	* testsuite/20_util/unsynchronized_pool_resource/cons.cc:
	Likewise.
	* testsuite/20_util/unsynchronized_pool_resource/is_equal.cc:
	Likewise.
	* testsuite/20_util/unsynchronized_pool_resource/options.cc:
	Likewise.
	* testsuite/20_util/unsynchronized_pool_resource/release.cc:
	Likewise.
	* testsuite/21_strings/basic_string/types/pmr_typedefs.cc:
	Likewise.
	* testsuite/23_containers/deque/types/pmr_typedefs.cc: Likewise.
	* testsuite/23_containers/deque/types/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/forward_list/pmr_typedefs.cc:
	Likewise.
	* testsuite/23_containers/forward_list/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/list/pmr_typedefs.cc: Likewise.
	* testsuite/23_containers/list/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/map/pmr_typedefs.cc: Likewise.
	* testsuite/23_containers/map/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/multimap/pmr_typedefs.cc: Likewise.
	* testsuite/23_containers/multimap/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/multiset/pmr_typedefs.cc: Likewise.
	* testsuite/23_containers/multiset/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/set/pmr_typedefs.cc: Likewise.
	* testsuite/23_containers/set/pmr_typedefs_debug.cc: Likewise.
	* testsuite/23_containers/unordered_map/pmr_typedefs.cc:
	Likewise.
	* testsuite/23_containers/unordered_map/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/pmr_typedefs.cc:
	Likewise.
	* testsuite/23_containers/unordered_multimap/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/pmr_typedefs.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/pmr_typedefs.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/23_containers/vector/pmr_typedefs.cc: Likewise.
	* testsuite/23_containers/vector/types/pmr_typedefs_debug.cc:
	Likewise.
	* testsuite/28_regex/match_results/pmr_typedefs.cc: Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/29_atomics/atomic/69769.cc: Remove -std=gnu++17 from
	dg-options.
	* testsuite/29_atomics/atomic/is_always_lock_free.cc:
	* testsuite/29_atomics/atomic/requirements/typedefs.cc:
	* testsuite/29_atomics/atomic_integral/is_always_lock_free.cc:
	* testsuite/29_atomics/atomic_integral/requirements/typedefs.cc:
	* testsuite/30_threads/lock_guard/cons/deduction.cc: Likewise.
	* testsuite/30_threads/scoped_lock/cons/1.cc: Likewise.
	* testsuite/30_threads/scoped_lock/cons/deduction.cc: Likewise.
	* testsuite/30_threads/scoped_lock/requirements/explicit_instantiation.cc:
	Likewise.
	* testsuite/30_threads/scoped_lock/requirements/typedefs.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.
	* testsuite/30_threads/unique_lock/cons/deduction.cc: Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/any/assign/1.cc: Remove -std=gnu++17 from
	dg-options directive.
	* 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/90415.cc: Likewise.
	* testsuite/20_util/any/cons/92156.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_neg.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/modifiers/83658.cc: Likewise.
	* testsuite/20_util/any/modifiers/92156.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/optional/77288.cc: Likewise.
	* testsuite/20_util/optional/84601.cc: Likewise.
	* testsuite/20_util/optional/assignment/1.cc: Likewise.
	* testsuite/20_util/optional/assignment/2.cc: Likewise.
	* testsuite/20_util/optional/assignment/3.cc: Likewise.
	* testsuite/20_util/optional/assignment/4.cc: Likewise.
	* testsuite/20_util/optional/assignment/5.cc: Likewise.
	* testsuite/20_util/optional/assignment/6.cc: Likewise.
	* testsuite/20_util/optional/assignment/7.cc: Likewise.
	* testsuite/20_util/optional/assignment/8.cc: Likewise.
	* testsuite/20_util/optional/assignment/9.cc: Likewise.
	* testsuite/20_util/optional/bad_access.cc: Likewise.
	* testsuite/20_util/optional/cons/77727.cc: Likewise.
	* testsuite/20_util/optional/cons/85642.cc: Likewise.
	* testsuite/20_util/optional/cons/copy.cc: Likewise.
	* testsuite/20_util/optional/cons/deduction.cc: Likewise.
	* testsuite/20_util/optional/cons/default.cc: Likewise.
	* testsuite/20_util/optional/cons/move.cc: Likewise.
	* testsuite/20_util/optional/cons/trivial.cc: Likewise.
	* testsuite/20_util/optional/cons/value.cc: Likewise.
	* testsuite/20_util/optional/cons/value_neg.cc: Likewise.
	* testsuite/20_util/optional/constexpr/cons/default.cc:
	Likewise.
	* testsuite/20_util/optional/constexpr/cons/value.cc: Likewise.
	* testsuite/20_util/optional/constexpr/in_place.cc: Likewise.
	* testsuite/20_util/optional/constexpr/make_optional.cc:
	Likewise.
	* testsuite/20_util/optional/constexpr/nullopt.cc: Likewise.
	* testsuite/20_util/optional/constexpr/observers/1.cc: Likewise.
	* testsuite/20_util/optional/constexpr/observers/2.cc: Likewise.
	* testsuite/20_util/optional/constexpr/observers/3.cc: Likewise.
	* testsuite/20_util/optional/constexpr/observers/4.cc: Likewise.
	* testsuite/20_util/optional/constexpr/observers/5.cc: Likewise.
	* testsuite/20_util/optional/constexpr/relops/1.cc: Likewise.
	* testsuite/20_util/optional/constexpr/relops/2.cc: Likewise.
	* testsuite/20_util/optional/constexpr/relops/3.cc: Likewise.
	* testsuite/20_util/optional/constexpr/relops/4.cc: Likewise.
	* testsuite/20_util/optional/constexpr/relops/5.cc: Likewise.
	* testsuite/20_util/optional/constexpr/relops/6.cc: Likewise.
	* testsuite/20_util/optional/hash.cc: Likewise.
	* testsuite/20_util/optional/in_place.cc: Likewise.
	* testsuite/20_util/optional/make_optional.cc: Likewise.
	* testsuite/20_util/optional/nullopt.cc: Likewise.
	* testsuite/20_util/optional/observers/1.cc: Likewise.
	* testsuite/20_util/optional/observers/2.cc: Likewise.
	* testsuite/20_util/optional/observers/3.cc: Likewise.
	* testsuite/20_util/optional/observers/4.cc: Likewise.
	* testsuite/20_util/optional/observers/5.cc: Likewise.
	* testsuite/20_util/optional/observers/6.cc: Likewise.
	* testsuite/20_util/optional/relops/1.cc: Likewise.
	* testsuite/20_util/optional/relops/2.cc: Likewise.
	* testsuite/20_util/optional/relops/3.cc: Likewise.
	* testsuite/20_util/optional/relops/4.cc: Likewise.
	* testsuite/20_util/optional/relops/5.cc: Likewise.
	* testsuite/20_util/optional/relops/6.cc: Likewise.
	* testsuite/20_util/optional/relops/7.cc: Likewise.
	* testsuite/20_util/optional/requirements.cc: Likewise.
	* testsuite/20_util/optional/swap/1.cc: Likewise.
	* testsuite/20_util/optional/swap/2.cc: Likewise.
	* testsuite/20_util/optional/typedefs.cc: Likewise.
	* testsuite/20_util/variant/80165.cc: Likewise.
	* testsuite/20_util/variant/85183.cc: Likewise.
	* testsuite/20_util/variant/86874.cc: Likewise.
	* testsuite/20_util/variant/87431.cc: Likewise.
	* testsuite/20_util/variant/87619.cc: Likewise.
	* testsuite/20_util/variant/91807.cc: Likewise.
	* testsuite/20_util/variant/any.cc: Likewise.
	* testsuite/20_util/variant/compile.cc: Likewise.
	* testsuite/20_util/variant/deduction.cc: Likewise.
	* testsuite/20_util/variant/exception_safety.cc: Likewise.
	* testsuite/20_util/variant/hash.cc: Likewise.
	* testsuite/20_util/variant/index_type.cc: Likewise.
	* testsuite/20_util/variant/relops/89851.cc: Likewise.
	* testsuite/20_util/variant/relops/90008.cc: Likewise.
	* testsuite/20_util/variant/run.cc: Likewise.
	* testsuite/20_util/variant/visit.cc: Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_filebuf/open/char/path.cc: Remove
	-std=gnu++17 from dg-options directive.
	* testsuite/27_io/basic_fstream/cons/char/path.cc: Likewise.
	* testsuite/27_io/basic_fstream/open/char/path.cc: Likewise.
	* testsuite/27_io/basic_ifstream/cons/char/path.cc: Likewise.
	* testsuite/27_io/basic_ifstream/open/char/path.cc: Likewise.
	* testsuite/27_io/basic_ofstream/cons/char/path.cc: Likewise.
	* testsuite/27_io/basic_ofstream/open/char/path.cc: Likewise.
	* testsuite/27_io/filesystem/directory_entry/86597.cc: Likewise.
	* testsuite/27_io/filesystem/directory_entry/lwg3171.cc:
	Likewise.
	* testsuite/27_io/filesystem/file_status/1.cc: Likewise.
	* testsuite/27_io/filesystem/filesystem_error/cons.cc: Likewise.
	* testsuite/27_io/filesystem/filesystem_error/copy.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/91067.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/caching.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/directory_iterator.cc:
	Likewise.
	* testsuite/27_io/filesystem/iterators/pop.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/recursion_pending.cc:
	Likewise.
	* testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/absolute.cc: Likewise.
	* testsuite/27_io/filesystem/operations/all.cc: Likewise.
	* testsuite/27_io/filesystem/operations/canonical.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy_file.cc: Likewise.
	* testsuite/27_io/filesystem/operations/create_directories.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/create_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/create_symlink.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/current_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/equivalent.cc: Likewise.
	* testsuite/27_io/filesystem/operations/exists.cc: Likewise.
	* testsuite/27_io/filesystem/operations/file_size.cc: Likewise.
	* testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/27_io/filesystem/operations/last_write_time.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/permissions.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/proximate.cc: Likewise.
	* testsuite/27_io/filesystem/operations/read_symlink.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/relative.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Likewise.
	* testsuite/27_io/filesystem/operations/rename.cc: Likewise.
	* testsuite/27_io/filesystem/operations/resize_file.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/space.cc: Likewise.
	* testsuite/27_io/filesystem/operations/status.cc: Likewise.
	* testsuite/27_io/filesystem/operations/symlink_status.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/temp_directory_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/weakly_canonical.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/append/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/append/source.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/assign.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/compare.cc: Likewise.
	* 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.
	* testsuite/27_io/filesystem/path/concat/92853.cc: Likewise.
	* testsuite/27_io/filesystem/path/concat/94063.cc: Likewise.
	* testsuite/27_io/filesystem/path/concat/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/concat/strings.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/80762.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/90281.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/90634.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/default.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/construct/format.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/locale.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/range.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/string_view.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_name.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/stem.cc: Likewise.
	* testsuite/27_io/filesystem/path/factory/u8path-char8_t.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/factory/u8path.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/normal.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/generation/normal2.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/generation/proximate.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/generation/relative.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/generic/94242.cc: Likewise.
	* testsuite/27_io/filesystem/path/generic/generic_string.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/generic/utf.cc: Likewise.
	* testsuite/27_io/filesystem/path/generic/wchar_t.cc: Likewise.
	* testsuite/27_io/filesystem/path/io/dr2989.cc: Likewise.
	* testsuite/27_io/filesystem/path/itr/components.cc: Likewise.
	* testsuite/27_io/filesystem/path/itr/traversal.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/clear.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/make_preferred.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/modifiers/swap.cc: Likewise.
	* testsuite/27_io/filesystem/path/native/alloc.cc: Likewise.
	* testsuite/27_io/filesystem/path/native/string-char8_t.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/native/string.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/hash_value.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/empty.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/empty_neg.cc:
	* 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_absolute.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/is_relative.cc:
	Likewise.
	* testsuite/experimental/filesystem/path/construct/string_view.cc:
	Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_construct.cc:
	Remove -std=gnu++17 from dg-options.
	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_copy_move.cc:
	Likewise.
	* testsuite/20_util/specialized_algorithms/pstl/uninitialized_fill_destroy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_merge/inplace_merge.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_merge/merge.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/copy_if.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/copy_move.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/fill.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/generate.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/is_partitioned.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/partition.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/partition_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/remove.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/remove_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/replace.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/replace_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/rotate.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/rotate_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/swap_ranges.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/transform_binary.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/transform_unary.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/unique.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_modifying_operations/unique_copy_equal.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/adjacent_find.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/all_of.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/any_of.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/count.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/equal.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_end.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_first_of.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/find_if.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/for_each.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/mismatch.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/none_of.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/nth_element.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/reverse.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/reverse_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_nonmodifying/search_n.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/includes.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/is_heap.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/is_sorted.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/lexicographical_compare.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/minmax_element.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/partial_sort.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/partial_sort_copy.cc:
	Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/set.cc: Likewise.
	* testsuite/25_algorithms/pstl/alg_sorting/sort.cc: Likewise.
	* testsuite/25_algorithms/pstl/feature_test-2.cc: Likewise.
	* testsuite/25_algorithms/pstl/feature_test-3.cc: Likewise.
	* testsuite/25_algorithms/pstl/feature_test-4.cc: Likewise.
	* testsuite/25_algorithms/pstl/feature_test-5.cc: Likewise.
	* testsuite/25_algorithms/pstl/feature_test.cc: Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/adjacent_difference.cc:
	Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/reduce.cc: Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/scan.cc: Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/transform_reduce.cc:
	Likewise.
	* testsuite/26_numerics/pstl/numeric_ops/transform_scan.cc:
	Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/scoped_allocator/69293_neg.cc: Add dg-error
	for additional errors in C++20.
	* testsuite/20_util/specialized_algorithms/memory_management_tools/destroy_neg.cc:
	Likewise.
	* testsuite/20_util/uses_allocator/69293_neg.cc: Likewise.
	* testsuite/27_io/filesystem/path/io/dr2989.cc: Likewise.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/variant/compile.cc: Rename 'any' to avoid
	clash with std::any.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (remove_cvref_t): Define in terms of
	remove_cvref.
	* testsuite/20_util/remove_cvref/value.cc: Check alias.

2021-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99006
	* include/bits/shared_ptr.h (allocate_shared): Assert that _Tp
	is not an array type.
	* include/bits/shared_ptr_base.h (__allocate_shared): Likewise.
	* testsuite/20_util/shared_ptr/creation/99006.cc: New test.

2021-05-11  Philippe Blain  <levraiphilippeblain@gmail.com>

	Backported from master:
	2021-04-21  Philippe Blain  <levraiphilippeblain@gmail.com>
		    Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99453
	* python/Makefile.am: Install libstdc++*-gdb.py more robustly.
	* python/Makefile.in: Regenerate.

2021-05-11  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-11  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/ryu/LOCAL_PATCHES: Update.
	* src/c++17/ryu/ryu_generic_128.h: Remove extern "C".
	Remove declarations for never-defined functions.
	* testsuite/20_util/to_chars/4.cc: New test.

2021-05-07  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/istream (__rvalue_stream_extraction_t): Replace
	use of __rval_streamable.
	* include/std/ostream (__rvalue_stream_insertion_t): Likewise.
	(__rval_streamable): Remove.
	(_Require_derived_from_ios_base, __derived_from_ios_base): New
	helper for checking constraints.
	* testsuite/27_io/basic_istream/extractors_other/char/4.cc: Fix
	reference to the wrong subclause of the standard.
	* testsuite/27_io/basic_istream/extractors_other/wchar_t/4.cc:
	Likewise.
	* testsuite/27_io/basic_ostream/inserters_other/char/6.cc:
	Likewise.
	* testsuite/27_io/basic_ostream/inserters_other/wchar_t/6.cc:
	Likewise.
	* testsuite/27_io/basic_ostream/inserters_other/char/99692.cc:
	New test.
	* testsuite/27_io/filesystem/path/io/dr2989.cc: Adjust pruned
	errors.

2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/istream (operator>>(Istream&&, x&)): Simplify, as
	per LWG 1203.
	* include/std/ostream (operator<<(Ostream&&, const x&)):
	Likewise.
	* testsuite/27_io/basic_istream/extractors_character/char/lwg2499_neg.cc:
	Adjust dg-error pattern.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/lwg2499_neg.cc:
	Likewise.
	* testsuite/27_io/basic_istream/extractors_other/char/4.cc: Define
	is_extractable trait to replace std::__is_extractable. Make it
	work with rvalue streams as well as lvalues, to replace f() and
	g() helper functions.
	* testsuite/27_io/basic_istream/extractors_other/wchar_t/4.cc:
	Likewise.
	* testsuite/27_io/basic_ostream/inserters_other/char/6.cc:
	Define is_insertable trait to replace std::__is_insertable. Make
	it work with rvalue streams as well as lvalues, to replace f()
	and g() helper functions.
	* testsuite/27_io/basic_ostream/inserters_other/wchar_t/6.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/io/dr2989.cc: Prune additional
	errors from new constraints.
	* testsuite/27_io/rvalue_streams-2.cc: Remove PR 80675 checks,
	which are no longer expected to compile.
	* testsuite/27_io/rvalue_streams.cc: Adjust existing test.
	Verify LWG 1203 changes.

2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-05  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/function_objects/invoke/3.cc: Check feature
	test macro.
	* testsuite/20_util/function_objects/invoke/version.cc: New test.

2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/future (promise::set_value): Check for existence
	of shared state before dereferncing it.
	(promise::set_exception, promise::set_value_at_thread_exit)
	(promise::set_exception_at_thread_exit): Likewise.
	(promise<R&>::set_value, promise<R&>::set_exception)
	(promise<R&>::set_value_at_thread_exit)
	(promise<R&>::set_exception_at_thread_exit): Likewise.
	(promise<void>::set_value, promise<void>::set_exception)
	(promise<void>::set_value_at_thread_exit)
	(promise<void>::set_exception_at_thread_exit): Likewise.
	* testsuite/30_threads/promise/members/at_thread_exit2.cc:
	Remove unused variable.

2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h (basic_string(const CharT*, const A&)):
	Do not do arithmetic on null pointer.

2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp
	(find_key_pointer(key_const_reference, false_type))
	(find_key_pointer(key_const_reference, true_type)): Do not
	dereference null pointer.

2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-04  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/from_chars/3.cc: Use unsigned type to avoid
	overflow.
	* testsuite/24_iterators/reverse_iterator/2.cc: Do not add
	non-zero value to null pointer.
	* testsuite/25_algorithms/copy_backward/move_iterators/69478.cc:
	Use past-the-end iterator for result.
	* testsuite/25_algorithms/move_backward/69478.cc: Likewise.
	* testsuite/25_algorithms/move_backward/93872.cc: Likewise.

2021-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-05-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100384
	* include/std/variant (__get_t): New alias template yielding the
	return type of std::get<N> on a variant.
	(__visit_result_t): New alias template yielding the result of
	std::visit.
	(__same_types): Move into namespace __detail::__variant.
	(__check_visitor_results): Likewise. Use __invoke_result_t and
	__get_t.
	(__check_visitor_result): Remove.
	(visit): Use __visit_result_t for return type.
	* testsuite/20_util/variant/100384.cc: New test.

2021-05-05  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-05-05  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (transform_view::_Iterator::iter_swap):
	Remove as per LWG 3520.
	(join_view::_Iterator::iter_swap): Add indirectly_swappable
	constraint as per LWG 3517.

2021-05-04  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-04-30  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (split_view::_InnerIter::operator++):
	Depend on _Base instead of _Vp directly, as per LWG 3532.

2021-04-30  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h (__cpp_lib_constexpr_string):
	Only define for C++17 and later.
	* include/std/version (__cpp_lib_semaphore): Fix condition
	to match the one in <semaphore>.

2021-04-29  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100259
	* include/experimental/internet (net::ip::make_error_code)
	(net::ip::make_error_condition, net::ip::make_network_v4)
	(net::ip::operator==(const udp&, const udp&)): Add 'inline'.

2021-04-29  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h (__cpp_lib_constexpr_string): Define.
	* include/std/version (__cpp_lib_constexpr_string): Define.
	* testsuite/21_strings/char_traits/requirements/constexpr_functions_c++17.cc:
	Check for __cpp_lib_constexpr_string.
	* testsuite/21_strings/char_traits/requirements/constexpr_functions_c++20.cc:
	Likewise.
	* testsuite/21_strings/char_traits/requirements/version.cc: New test.

2021-04-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100298
	* include/bits/std_thread.h (thread::hardware_concurrency): Add
	missing noexcept to inline definition for non-gthreads targets.

2021-04-28  Jakub Jelinek  <jakub@redhat.com>

	Revert:
	2021-04-22  Jakub Jelinek  <jakub@redhat.com>

	PR target/100182
	* testsuite/29_atomics/atomic_float/1.cc: Add dg-xfail-run-if for
	ia32.
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Add dg-skip-if for
	ia32.

2021-04-27  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-04-27  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/100290
	* include/std/ranges (join_view::_Iterator::operator++): Correct
	the return type of the lambda to avoid returning a copy of
	_M_parent->_M_inner.
	* testsuite/std/ranges/adaptors/join.cc (test10): New test.

2021-04-27  Release Manager

	* GCC 11.1.0 released.

2021-04-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_timed_wait.h (__cond_wait_until_impl):
	Handle system_clock as well as steady_clock.
	* testsuite/30_threads/semaphore/try_acquire_for.cc: Re-enable.
	* testsuite/30_threads/semaphore/try_acquire_until.cc:
	Re-enable.

2021-04-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-22  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/semaphore/try_acquire_posix.cc: Add
	options for libatomic.

2021-04-22  Thomas Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2021-04-22  Thomas Rodgers  <rodgert@twrodgers.com>

	* include/bits/atomic_wait.h: Always notify waiters in the
	case of 'bare' address notification.

2021-04-22  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100179
	* include/bits/semaphore_base.h: Remove #error.
	* include/std/semaphore: Do not define anything unless one of
	the implementations is available.

2021-04-22  Jakub Jelinek  <jakub@redhat.com>

	Backported from master:
	2021-04-22  Jakub Jelinek  <jakub@redhat.com>

	PR target/100182
	* testsuite/29_atomics/atomic_float/1.cc: Add dg-xfail-run-if for
	ia32.
	* testsuite/29_atomics/atomic_float/wait_notify.cc: Add dg-skip-if for
	ia32.

2021-04-22  Thomas Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2021-04-21  Thomas Rodgers  <rodgert@twrodgers.com>

	* include/bits/semaphore_base.h: Always reload __old in
	__atomic_semaphore::_S_do_try_acquire().
	* testsuite/30_threads/stop_token/stop_callback/destroy.cc:
	re-enable testcase.

2021-04-21  Thomas Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2021-04-21  Thomas Rodgers  <rodgert@twrodgers.com>

	* include/bits/semaphore_base.h: Add missing _M_try_acquire()
	member to __platform_wait.

2021-04-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/latch: Replace tab characters in license text.
	* include/std/semaphore: Likewise.

2021-04-21  Jakub Jelinek  <jakub@redhat.com>

	Backported from master:
	2021-04-21  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/100164
	* acinclude.m4: For POSIX semaphores AC_DEFINE HAVE_POSIX_SEMAPHORE
	rather than _GLIBCXX_HAVE_POSIX_SEMAPHORE.
	* configure: Regenerated.
	* config.h.in: Regenerated.

2021-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-20  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/semaphore/try_acquire_for.cc: Disable
	test for targets not using futexes for semaphores.
	* testsuite/30_threads/semaphore/try_acquire_until.cc: Likewise.
	* testsuite/30_threads/stop_token/stop_callback/destroy.cc:
	Disable for all targets.

2021-04-20  Thomas Rodgers  <trodgers@redhat.com>

	Backported from master:
	2021-04-20  Thomas Rodgers  <trodgers@redhat.com>

	* include/Makefile.am: Add new <bits/this_thread_sleep.h> header.
	* include/Makefile.in: Regenerate.
	* include/bits/this_thread_sleep.h: New file.
	* include/bits/atomic_base.h: Adjust all calls
	to __atomic_wait/__atomic_notify for new call signatures.
	* include/bits/atomic_timed_wait.h: Extensive rewrite.
	* include/bits/atomic_wait.h: Likewise.
	* include/bits/semaphore_base.h: Adjust all calls
	to __atomic_wait/__atomic_notify for new call signatures.
	* include/std/atomic: Likewise.
	* include/std/barrier: Likewise.
	* include/std/latch: Likewise.
	* include/std/semaphore: Likewise.
	* include/std/thread (this_thread::sleep_for)
	(this_thread::sleep_until): Move to new header.
	* testsuite/29_atomics/atomic/wait_notify/bool.cc: Simplify
	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/29_atomics/atomic_ref/wait_notify.cc: Likewise.

2021-04-20  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2021-04-20  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/95983
	* include/bits/stl_iterator.h (__detail::__move_iter_cat):
	Define.
	(move_iterator): Derive from the above in C++20 in order to
	conditionally define iterator_category as per P2259.
	(move_iterator::__base_cat): No longer used, so remove.
	(move_iterator::iterator_category): Remove in C++20.
	(__detail::__common_iter_use_postfix_proxy): Define.
	(common_iterator::_Proxy): Rename to ...
	(common_iterator:__arrow_proxy): ... this.
	(common_iterator::__postfix_proxy): Define as per P2259.
	(common_iterator::operator->): Adjust.
	(common_iterator::operator++): Adjust as per P2259.
	(iterator_traits<common_iterator>::_S_iter_cat): Define.
	(iterator_traits<common_iterator>::iterator_category): Change as
	per P2259.
	(__detail::__counted_iter_value_type): Define.
	(__detail::__counted_iter_concept): Define.
	(__detail::__counted_iter_cat): Define.
	(counted_iterator): Derive from the above three classes in order
	to conditionally define value_type, iterator_concept and
	iterator category respectively as per P2259.
	(counted_iterator::operator->): Define as per P2259.
	(incrementable_traits<counted_iterator>): Remove as per P2259.
	(iterator_traits<counted_iterator>): Adjust as per P2259.
	* include/std/ranges (__detail::__iota_view_iter_cat): Define.
	(iota_view::_Iterator): Derive from the above in order to
	conditionally define iterator_category as per P2259.
	(iota_view::_S_iter_cat): Rename to ...
	(iota_view::_S_iter_concept): ... this.
	(iota_view::iterator_concept): Use it to apply LWG 3291 changes.
	(iota_view::iterator_category): Remove.
	(__detail::__filter_view_iter_cat): Define.
	(filter_view::_Iterator): Derive from the above in order to
	conditionally define iterator_category as per P2259.
	(filter_view::_Iterator): Move to struct __filter_view_iter_cat.
	(filter_view::_Iterator::iterator_category): Remove.
	(transform_view::_Base): Define.
	(transform_view::__iter_cat): Define.
	(transform_view::_Iterator): Derive from the above in order to
	conditionally define iterator_category as per P2259.
	(transform_view::_Iterator::_Base): Just alias
	transform_view::_Base.
	(transform_view::_Iterator::_S_iter_cat): Move to struct
	transform_view::__iter_cat.
	(transform_view::_Iterator::iterator_category): Remove.
	(transform_view::_Sentinel::_Base): Just alias
	transform_view::_Base.
	(join_view::_Base): Define.
	(join_view::_Outer_iter): Define.
	(join_view::_Inner_iter): Define.
	(join_view::_S_ref_is_glvalue): Define.
	(join_view::__iter_cat): Define.
	(join_view::_Iterator): Derive from it in order to conditionally
	define iterator_category as per P2259.
	(join_view::_Iterator::_Base): Just alias join_view::_Base.
	(join_view::_Iterator::_S_ref_is_glvalue): Just alias
	join_view::_S_ref_is_glvalue.
	(join_view::_Iterator::_S_iter_cat): Move to struct
	transform_view::__iter_cat.
	(join_view::_Iterator::_Outer_iter): Just alias
	join_view::_Outer_iter.
	(join_view::_Iterator::_Inner_iter): Just alias
	join_view::_Inner_iter.
	(join_view::_Iterator::iterator_category): Remove.
	(join_view::_Sentinel::_Base): Just alias join_view::_Base.
	(__detail::__split_view_outer_iter_cat): Define.
	(__detail::__split_view_inner_iter_cat): Define.
	(split_view::_Base): Define.
	(split_view::_Outer_iter): Derive from __split_view_outer_iter_cat
	in order to conditionally define iterator_category as per P2259.
	(split_view::_Outer_iter::iterator_category): Remove.
	(split_view::_Inner_iter): Derive from __split_view_inner_iter_cat
	in order to conditionally define iterator_category as per P2259.
	(split_view::_Inner_iter::_S_iter_cat): Move to
	__split_view_inner_iter_cat.
	(split_view::_Inner_iter::iterator_category): Remove.
	(elements_view::_Base): Define.
	(elements_view::__iter_cat): Define.
	(elements_view::_Iterator): Derive from the above in order to
	conditionall define iterator_category as per P2259.
	(elements_view::_Iterator::_Base): Just alias
	elements_view::_Base.
	(elements_view::_Iterator::_S_iter_concept)
	(elements_view::_Iterator::iterator_concept): Define as per
	P2259.
	(elements_view::_Iterator::iterator_category): Remove.
	(elements_view::_Sentinel::_Base): Just alias
	elements_view::_Base.
	* testsuite/24_iterators/headers/iterator/synopsis_c++20.cc:
	Adjust constraints on iterator_traits<counted_iterator>.
	* testsuite/std/ranges/p2259.cc: New test.

2021-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2021-04-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100146
	* include/std/charconv (__cpp_lib_to_chars): Define
	conditionally.
	* include/std/version (__cpp_lib_to_chars): Likewise..
	* testsuite/20_util/from_chars/4.cc: Only check feature test
	macro, not _GLIBCXX_HAVE_USELOCALE.
	* testsuite/20_util/from_chars/5.cc: Likewise.
	* testsuite/20_util/from_chars/6.cc: Likewise.
	* testsuite/20_util/to_chars/long_double.cc: Likewise.

2021-04-20  Jakub Jelinek  <jakub@redhat.com>

	Backported from master:
	2021-04-20  Jakub Jelinek  <jakub@redhat.com>

	* testsuite/util/testsuite_abi.cc (compare_symbols): If any symbol
	versions with _IEEE128_ substring are found, set ieee_version_found
	to true.  Ignore missing symbols with _IEEE128_ in version name if
	!ieee_version_found.  Use i->first as version_name instead of
	i->second.version_name if the latter is empty.
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.

2021-04-19  H.J. Lu  <hjl.tools@gmail.com>

	* config/abi/post/x86_64-linux-gnu/x32/baseline_symbols.txt:
	Updated.

2021-04-17  Jakub Jelinek  <jakub@redhat.com>

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

2021-04-17  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/s390x-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.

2021-04-15  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/lib/dg-options.exp (add_options_for_libatomic): Also
	add libatomic options for 32-bit sparc*-*-linux-gnu.

2021-04-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/96657
	* libsupc++/Makefile.am: Add atomicity.cc here.
	* src/c++98/Makefile.am: Remove it from here.
	* libsupc++/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* testsuite/18_support/exception_ptr/96657.cc: New test.

2021-04-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100060
	* include/std/bit: Only include <ext/numeric_traits.h> for
	hosted build, use <limits> otherwise.

2021-04-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/backwards_compatibility.xml: Remove porting
	notes for libg++ and libstdc++-v2, and bibliography.
	* doc/html/*: Regenerated.

2021-04-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100044
	* include/bits/ranges_util.h (__detail::__iterator_sentinel_pair):
	Remove helper concept.
	(subrange(_Pr), subrange(Pr, __make_unsigned_like<...>)): Remove
	deduction guides, as per LWG 3404.
	* testsuite/std/ranges/subrange/lwg3282_neg.cc: Check that class
	template argument deduction fails.

2021-04-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/random/linear_congruential_engine/requirements/non_uint_neg.cc:
	Adjust expected error for C++20 mode.
	* testsuite/tr1/5_numerical_facilities/random/linear_congruential/requirements/non_uint_neg.cc:
	Likewise.

2021-04-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99995
	* testsuite/17_intro/headers/c++1998/49745.cc: Include all
	standard headers and XFAIL for effective-target c++20.

2021-04-09  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/99402
	* include/debug/helper_functions.h (__can_advance(_InputIterator,
	const std::pair<_Diff, _Distance_precision>&, int)): New.
	(__can_advance(const _Safe_iterator<>&,
	const std::pair<_Diff, _Distance_precision>&, int)): New.
	* include/debug/macros.h (__glibcxx_check_can_increment_dist): New,
	use latter.
	(__glibcxx_check_can_increment_range): Adapt to use latter.
	(__glibcxx_check_can_decrement_range): Likewise.
	* include/debug/safe_iterator.h
	(_Safe_iterator<>::_M_can_advance(const std::pair<_Diff, _Distance_precision>&,
	int)): New.
	(__can_advance(const _Safe_iterator<>&,
	const std::pair<_Diff, _Distance_precision>&, int)): New.
	* include/debug/safe_iterator.tcc
	(_Safe_iterator<>::_M_can_advance(const std::pair<_Diff, _Distance_precision>&,
	int)): New.
	(_Safe_iterator<>::_M_valid_range(const _Safe_iterator<>&,
	std::pair<difference_type, _Distance_precision>&, bool)): Adapt for
	__dp_sign_max_size.
	(__copy_move_a): Adapt to use __glibcxx_check_can_increment_dist.
	(__copy_move_backward_a): Likewise.
	(__equal_aux): Likewise.
	* include/debug/stl_iterator.h (__can_advance(const std::reverse_iterator<>&,
	const std::pair<_Diff, _Distance_precision>&, int)): New.
	(__can_advance(const std::move_iterator<>&,
	const std::pair<_Diff, _Distance_precision>&, int)): New.
	* testsuite/25_algorithms/copy/debug/99402.cc: New test.

2021-04-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99985
	* include/bits/hashtable.h (_Hashtable::_S_nothrow_move()): Fix
	to be a valid constexpr function in C++11.
	* testsuite/23_containers/unordered_set/cons/99985.cc: New test.

2021-04-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_fwd.h: Fix doxygen group command.
	* include/bits/streambuf_iterator.h: Likewise.
	* include/bits/uses_allocator_args.h: Likewise.
	* include/std/memory: Likewise.
	* include/tr1/complex: Likewise.

2021-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h: Tweak doxygen comment.

2021-04-08  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (__detail::find): Define.
	(split_view::_OuterIter::operator++): Apply proposed resolution
	of LWG 3505.
	* testsuite/std/ranges/adaptors/split.cc (test10): New test.

2021-04-08  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (__detail::find_if): Simplify.
	(__detail::find_if_not): Likewise.
	(__detail::min): Remove.
	(__detail::mismatch): Simplify.
	(take_view::size): Use std::min instead of __detail::min.

2021-04-08  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (__detail::__returnable_element): New
	concept.
	(elements_view): Use this concept in its constraints.  Add
	missing private access specifier.
	(elements_view::_S_get_element): Define as per LWG 3502.
	(elements_view::operator*, elements_view::operator[]): Use
	_S_get_element.
	(elements_view::operator++): Remove unnecessary constraint
	as per LWG 3492.
	* testsuite/std/ranges/adaptors/elements.cc (test05): New test.

2021-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* doc/Makefile.am (stamp-pdf-doxygen): Also grep for
	out-of-memory error in log file.
	* doc/Makefile.in: Regenerate.

2021-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* configure: Regenerate.

2021-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/random.h: Fix doxygen group commands.
	* include/bits/regex_constants.h: Likewise.
	* include/tr1/random.h: Likewise.

2021-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/hashtable.h (_Hashtable::_S_nothrow_move()):
	New function to determine noexcept-specifier for move
	constructors.
	(_Hashtable): Use _S_nothrow_move() on move constructors.
	* testsuite/23_containers/unordered_map/cons/noexcept_move_construct.cc:
	Correct static assertion message.
	* testsuite/23_containers/unordered_multimap/cons/noexcept_move_construct.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/cons/noexcept_move_construct.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/cons/noexcept_move_construct.cc:
	Likewise.

2021-04-08  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/98384
	* testsuite/20_util/to_chars/long_double.cc: Don't run the test
	on targets without a large long double.  XFAIL the execution on
	targets with a non-conforming printf.

2021-04-08  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/99433
	* include/std/ranges (__adaptor::__maybe_refwrap): Remove.
	(__adaptor::__adaptor_invocable): New concept.
	(__adaptor::__adaptor_partial_app_viable): New concept.
	(__adaptor::_RangeAdaptorClosure): Rewrite, turning it into a
	non-template base class.
	(__adaptor::_RangeAdaptor): Rewrite, turning it into a CRTP base
	class template.
	(__adaptor::_Partial): New class template that represents
	partial application of a range adaptor non-closure.
	(__adaptor::__pipe_invocable): New concept.
	(__adaptor::_Pipe): New class template.
	(__detail::__can_ref_view): New concept.
	(__detail::__can_subrange): New concept.
	(all): Replace the lambda here with ...
	(_All): ... this functor.  Add appropriate constraints.
	(__detail::__can_filter_view): New concept.
	(filter, _Filter): As in all/_All.
	(__detail::__can_transform): New concept.
	(transform, _Transform): As in all/_All.
	(__detail::__can_take_view): New concept.
	(take, _Take): As in all/_All.
	(__detail::__can_take_while_view): New concept.
	(take_while, _TakeWhile): As in all/_All.
	(__detail::__can_drop_view): New concept.
	(drop, _Drop): As in all/_All.
	(__detail::__can_drop_while_view): New concept.
	(drop_while, _DropWhile): As in all/_All.
	(__detail::__can_join_view): New concept.
	(join, _Join): As in all/_All.
	(__detail::__can_split_view): New concept.
	(split, _Split): As in all/_All.  Rename template parameter
	_Fp to _Pattern.
	(__detail::__already_common): New concept.
	(__detail::__can_common_view): New concept.
	(common, _Common): As in all/_All.
	(__detail::__can_reverse_view): New concept.
	(reverse, _Reverse): As in all/_All.
	(__detail::__can_elements_view): New concept.
	(elements, _Elements): As in all/_All.
	(keys, values): Adjust.
	* testsuite/std/ranges/adaptors/99433.cc: New test.
	* testsuite/std/ranges/adaptors/all.cc: No longer expect that
	adding empty range adaptor closure objects to a pipeline doesn't
	increase the size of the pipeline.
	(test05): New test.
	* testsuite/std/ranges/adaptors/common.cc (test03): New test.
	* testsuite/std/ranges/adaptors/drop.cc (test09): New test.
	* testsuite/std/ranges/adaptors/drop_while.cc (test04): New test.
	* testsuite/std/ranges/adaptors/elements.cc (test04): New test.
	* testsuite/std/ranges/adaptors/filter.cc (test06): New test.
	* testsuite/std/ranges/adaptors/join.cc (test09): New test.
	* testsuite/std/ranges/adaptors/p2281.cc: New test.
	* testsuite/std/ranges/adaptors/reverse.cc (test07): New test.
	* testsuite/std/ranges/adaptors/split.cc (test01, test04):
	Adjust.
	(test09): New test.
	* testsuite/std/ranges/adaptors/split_neg.cc (test01): Adjust
	expected error message.
	(test02): Likewise.  Extend test.
	* testsuite/std/ranges/adaptors/take.cc (test06): New test.
	* testsuite/std/ranges/adaptors/take_while.cc (test05): New test.
	* testsuite/std/ranges/adaptors/transform.cc (test07, test08):
	New test.

2021-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/string_view: Adjust Doxygen @file comment.

2021-04-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (is_scoped_enum<T>): Constrain partial
	specialization to not match incomplete enum types. Use a
	requires-expression instead of instantiating is_convertible.
	(is_scoped_enum<const T>): Add as workaround for PR c++/99968.
	* testsuite/20_util/is_scoped_enum/value.cc: Check with
	incomplete types and opaque-enum-declarations.

2021-04-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99805
	* src/c++17/fs_path.cc (path::_M_split_cmpts): Do not call
	non-const member on _M_pathname, to avoid copy-on-write.
	* testsuite/27_io/filesystem/path/decompose/parent_path.cc:
	Check construction from strings that might be shared.

2021-04-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/move.h (forward, move, move_if_noexcept)
	(addressof): Add _GLIBCXX_NODISCARD.
	* include/bits/ranges_cmp.h (identity::operator()): Add
	nodiscard attribute.
	* include/c_global/cstddef (to_integer): Likewise.
	* include/std/bit (bit_cast): Likewise.
	* include/std/utility (as_const, to_underlying): Likewise.

2021-04-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/move.h (forward): Change static_assert message
	to be unambiguous about what must be true.
	* testsuite/20_util/forward/c_neg.cc: Adjust dg-error.
	* testsuite/20_util/forward/f_neg.cc: Likewise.

2021-04-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/alloc_traits.h: Use markdown for code font.
	* include/bits/basic_string.h: Fix @param names.
	* include/bits/max_size_type.h: Remove period after @file.
	* include/bits/regex.h: Fix duplicate @retval names, and rename.
	* include/ext/pb_ds/detail/priority_queue_base_dispatch.hpp: Add
	group open to match existing group close.
	* include/ext/pb_ds/priority_queue.hpp: Add blank line before group
	open.

2021-04-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_base.h: Fix doxygen group close.
	* include/bits/basic_ios.h: Likewise.
	* include/bits/forward_list.h: Likewise.
	* include/bits/fs_dir.h: Likewise.
	* include/bits/fs_ops.h: Likewise.
	* include/bits/fs_path.h: Likewise.
	* include/bits/functional_hash.h: Likewise.
	* include/bits/gslice.h: Likewise.
	* include/bits/gslice_array.h: Likewise.
	* include/bits/hashtable_policy.h: Likewise.
	* include/bits/indirect_array.h: Likewise.
	* include/bits/locale_classes.h: Likewise.
	* include/bits/locale_facets.h: Likewise.
	* include/bits/locale_facets_nonio.h: Likewise.
	* include/bits/mask_array.h: Likewise.
	* include/bits/refwrap.h: Likewise.
	* include/bits/regex.h: Likewise.
	* include/bits/regex_automaton.h: Likewise.
	* include/bits/regex_compiler.h: Likewise.
	* include/bits/regex_constants.h: Likewise.
	* include/bits/regex_error.h: Likewise.
	* include/bits/regex_executor.h: Likewise.
	* include/bits/regex_scanner.h: Likewise.
	* include/bits/shared_ptr.h: Likewise.
	* include/bits/shared_ptr_atomic.h: Likewise.
	* include/bits/shared_ptr_base.h: Likewise.
	* include/bits/slice_array.h: Likewise.
	* include/bits/specfun.h: Likewise.
	* include/bits/std_function.h: Likewise.
	* include/bits/std_mutex.h: Likewise.
	* include/bits/stl_deque.h: Likewise.
	* include/bits/stl_iterator.h: Likewise.
	* include/bits/stl_iterator_base_types.h: Likewise.
	* include/bits/stl_map.h: Likewise.
	* include/bits/stl_multimap.h: Likewise.
	* include/bits/stl_multiset.h: Likewise.
	* include/bits/stl_numeric.h: Likewise.
	* include/bits/stl_pair.h: Likewise.
	* include/bits/stl_set.h: Likewise.
	* include/bits/stl_uninitialized.h: Likewise.
	* include/bits/stream_iterator.h: Likewise.
	* include/bits/streambuf_iterator.h: Likewise.
	* include/bits/unique_ptr.h: Likewise.
	* include/bits/unordered_map.h: Likewise.
	* include/bits/unordered_set.h: Likewise.
	* include/decimal/decimal: Likewise.
	* include/experimental/any: Likewise.
	* include/experimental/array: Likewise.
	* include/experimental/bits/fs_dir.h: Likewise.
	* include/experimental/bits/fs_fwd.h: Likewise.
	* include/experimental/bits/fs_ops.h: Likewise.
	* include/experimental/bits/fs_path.h: Likewise.
	* include/experimental/buffer: Likewise.
	* include/experimental/internet: Likewise.
	* include/experimental/optional: Likewise.
	* include/experimental/propagate_const: Likewise.
	* include/experimental/socket: Likewise.
	* include/ext/pb_ds/assoc_container.hpp: Likewise.
	* include/ext/pb_ds/detail/priority_queue_base_dispatch.hpp:
	Likewise.
	* include/ext/pb_ds/detail/tree_policy/node_metadata_selector.hpp: Likewise.
	* include/ext/pb_ds/detail/trie_policy/node_metadata_selector.hpp: Likewise.
	* include/ext/pb_ds/detail/types_traits.hpp: Likewise.
	* include/ext/pb_ds/exception.hpp: Likewise.
	* include/ext/pb_ds/priority_queue.hpp: Likewise.
	* include/ext/pb_ds/tag_and_trait.hpp: Likewise.
	* include/ext/random: Likewise.
	* include/std/any: Likewise.
	* include/std/atomic: Likewise.
	* include/std/bitset: Likewise.
	* include/std/chrono: Likewise.
	* include/std/complex: Likewise.
	* include/std/condition_variable: Likewise.
	* include/std/fstream: Likewise.
	* include/std/future: Likewise.
	* include/std/iostream: Likewise.
	* include/std/istream: Likewise.
	* include/std/mutex: Likewise.
	* include/std/numeric: Likewise.
	* include/std/ostream: Likewise.
	* include/std/ratio: Likewise.
	* include/std/shared_mutex: Likewise.
	* include/std/stdexcept: Likewise.
	* include/std/streambuf: Likewise.
	* include/std/system_error: Likewise.
	* include/std/thread: Likewise.
	* include/std/valarray: Likewise.
	* include/std/variant: Likewise.
	* include/tr1/cmath: Likewise.
	* include/tr1/regex: Likewise.
	* include/tr2/dynamic_bitset: Likewise.
	* libsupc++/atomic_lockfree_defines.h: Likewise.
	* libsupc++/exception: Likewise.
	* libsupc++/exception.h: Likewise.
	* libsupc++/exception_ptr.h: Likewise.
	* libsupc++/nested_exception.h: Likewise.

2021-03-31  Alexandre Oliva  <oliva@adacore.com>

	* testsuite/30_threads/future/members/poll.cc: Use faster
	after-ready call in the calibration loop.

2021-03-29  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2017.xml: Adjust link for PSTL.
	* doc/html/manual/status.html: Regenerate.

2021-03-28  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/forward_list
	(forward_list(forward_list&&, const allocator_type&)): Add noexcept qualification.
	* include/debug/list (list(list&&, const allocator_type&)): Likewise and add
	call to safe container allocator aware move constructor.
	* include/debug/vector (vector(vector&&, const allocator_type&)):
	Fix noexcept qualification.
	* testsuite/23_containers/forward_list/cons/noexcept_move_construct.cc:
	Add allocator-extended move constructor noexceot qualification check.
	* testsuite/23_containers/list/cons/noexcept_move_construct.cc: Likewise.

2021-03-26  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/random.cc (USE_LCG): Define when a pseudo-random
	fallback is needed.
	[USE_LCG] (bad_seed, construct_lcg_at, destroy_lcg_at, __lcg):
	New helper functions and callback.
	(random_device::_M_init): Add 'prng' and 'all' enumerators.
	Replace switch with fallthrough with a series of 'if' statements.
	[USE_LCG]: Construct an lcg_type engine and use __lcg when cpuid
	checks fail.
	(random_device::_M_init_pretr1) [USE_MT19937]: Accept "prng"
	token.
	(random_device::_M_getval): Check for callback unconditionally
	and always pass _M_file pointer.
	* testsuite/26_numerics/random/random_device/85494.cc: Remove
	effective-target check. Use new random_device_available helper.
	* testsuite/26_numerics/random/random_device/94087.cc: Likewise.
	* testsuite/26_numerics/random/random_device/cons/default-cow.cc:
	Remove effective-target check.
	* testsuite/26_numerics/random/random_device/cons/default.cc:
	Likewise.
	* testsuite/26_numerics/random/random_device/cons/token.cc: Use
	new random_device_available helper. Test "prng" token.
	* testsuite/util/testsuite_random.h (random_device_available):
	New helper function.

2021-03-25  François Dumont  <fdumont@gcc.gnu.org>

	* include/debug/string
	(basic_string(const basic_string&, const _Alloc&)): Define even if !_GLIBCXX_USE_CXX11_ABI.
	(basic_string(basic_string&&, const _Alloc&)): Likewise and add noexcept qualification.
	(basic_string<>::erase): Adapt to take __const_iterator.
	(basic_string(const _CharT*, const _Allocator&)): Remove assign call.
	(basic_string<>::insert(const_iterator, _InputIte, _InputIte)): Try to
	remove iterator debug layer even if !_GLIBCXX_USE_CXX11_ABI.
	[_GLIBCXX_USE_CHAR8_T] (__gnu_debug::u8string): New.
	(__gnu_debug::u16string, __gnu_debug::u32string): New.
	(std::hash<__gnu_debug::basic_string<>>): New partial specialization.
	(std::__is_fast_hash<__gnu_debug::basic_string<>>): Likewise.
	* testsuite/util/exception/safety.h
	(erase_base<__gnu_debug::basic_string<>>): New partial specialization.
	(insert_base<__gnu_debug::basic_string<>>): Likewise.
	* testsuite/util/testsuite_container_traits.h (traits<__gnu_debug::basic_string<>>):
	New partial specialization.
	* testsuite/21_strings/basic_string/hash/debug.cc: New test.
	* testsuite/21_strings/basic_string/requirements/citerators.cc:
	Add test on __gnu_debug::string.
	* testsuite/21_strings/basic_string/requirements/dr438/constructor.cc: Likewise.
	* testsuite/21_strings/basic_string/requirements/exception/basic.cc: Likewise.
	* testsuite/21_strings/basic_string/requirements/exception/generation_prohibited.cc:
	Likewise.
	* testsuite/21_strings/basic_string/requirements/exception/propagation_consistent.cc:
	Likewise.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char16_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char32_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/char8_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/requirements/explicit_instantiation/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/requirements/typedefs.cc: Likewise.

2021-03-25  Jakub Jelinek  <jakub@redhat.com>

	PR c++/99672
	* testsuite/18_support/source_location/consteval.cc (main): Adjust
	expected column numbers.
	* testsuite/18_support/source_location/1.cc (main): Likewise.

2021-03-25  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Declare malloc.

2021-03-25  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/exception/safety.h (setup_base::generate):
	Support seeding random engine.
	(erase_point, erase_range): Adjust range of random numbers to
	ensure dereferenceable iterators are used where required.
	(generation_prohibited::run): Do not try to erase from empty
	containers.
	* testsuite/util/testsuite_containergen.h (test_containers):
	Support seeding random engine.

2021-03-23  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/std/ranges/adaptors/reverse.cc: Replace duplicated
	line with a check that uses the const being/end overloads.

2021-03-23  Moritz Sichert  <sichert@in.tum.de>

	* include/std/ranges (reverse_view::begin, reverse_view::end):
	Qualify make_reverse_iterator calls to avoid ADL.
	* testsuite/std/ranges/adaptors/reverse.cc: Test that
	views::reverse works when make_reverse_iterator is defined
	in an associated namespace.

2021-03-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/c++config (_GLIBCXX_LONG_DOUBLE_ALT128_COMPAT):
	Do not define when compiling with Clang.

2021-03-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/string_view (basic_string_view(Range&&)): Define new
	constructor and deduction guide.
	* testsuite/21_strings/basic_string_view/cons/char/range_c++20.cc: New test.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/range_c++20.cc: New test.

2021-03-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/range_access.h (begin(T (&)[N]), end(T (&)[N])):
	Add missing 'noexcept' as per LWG 2280.
	(rbegin(T (&)[N]), rend(T (&)[N]), rbegin(initializer_list<T>))
	(rend(initializer_list<T>)): Add 'noexcept' as per LWG 3537.
	* testsuite/24_iterators/range_access/range_access.cc: Check for
	expected noexcept specifiers. Check result types of generic
	std::begin and std::end overloads.
	* testsuite/24_iterators/range_access/range_access_cpp14.cc:
	Check for expected noexcept specifiers.
	* testsuite/24_iterators/range_access/range_access_cpp17.cc:
	Likewise.

2021-03-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (is_scoped_enum): Define.
	* include/std/version (__cpp_lib_is_scoped_enum): Define.
	* testsuite/20_util/is_scoped_enum/value.cc: New test.
	* testsuite/20_util/is_scoped_enum/version.cc: New test.

2021-03-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99341
	* config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Remove
	std::once_flag symbols.
	* config/abi/post/ia64-linux-gnu/baseline_symbols.txt: Likewise.
	* config/abi/post/m68k-linux-gnu/baseline_symbols.txt: Likewise.
	* config/abi/post/riscv64-linux-gnu/baseline_symbols.txt:
	Likewise.
	* config/abi/pre/gnu.ver: Likewise.
	* src/c++11/mutex.cc [_GLIBCXX_HAVE_LINUX_FUTEX]
	(struct __once_flag_compat): Remove.
	(_ZNSt9once_flag11_M_activateEv): Remove.
	(_ZNSt9once_flag9_M_finishEb): Remove.

2021-03-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99341
	* include/std/mutex [_GLIBCXX_HAVE_LINUX_FUTEX] (once_flag):
	Revert to pthread_once_t implementation.
	[_GLIBCXX_HAVE_LINUX_FUTEX] (call_once): Likewise.
	* src/c++11/mutex.cc [_GLIBCXX_HAVE_LINUX_FUTEX]
	(struct __once_flag_compat): New type matching the reverted
	implementation of once_flag using futexes.
	(once_flag::_M_activate): Remove, replace with ...
	(_ZNSt9once_flag11_M_activateEv): ... alias symbol.
	(once_flag::_M_finish): Remove, replace with ...
	(_ZNSt9once_flag9_M_finishEb): ... alias symbol.
	* testsuite/30_threads/call_once/66146.cc: Removed.

2021-03-15  Iain Sandoe  <iain@sandoe.co.uk>

	* testsuite/17_intro/names.cc: Exclude j from the list
	of test symbols for Darwin.

2021-03-15  Iain Sandoe  <iain@sandoe.co.uk>

	* config/os/bsd/darwin/ppc-extra.ver: Add matching for
	to_chars and from_chars for long double.

2021-03-15  Patrick Palka  <ppalka@redhat.com>

	* include/bits/max_size_type.h (__max_size_type::operator _Tp):
	Fix formatting.
	(__max_size_type::operator++): Define.
	(__max_size_type::operator--): Likewise.
	(__max_size_type::operator<=>): Conditionally define (in place
	of the other comparison operators).
	(__max_diff_type::operator _Tp): Fix formatting.
	(__max_diff_type::operator++): Define.
	(__max_diff_type::operator--): Likewise.
	(__max_diff_type::operator<=>): Conditionally define (in place
	of the other comparison operators).
	* testsuite/std/ranges/iota/max_size_type.cc (test01): Test
	these operator overloads.

2021-03-15  Caroline Tice  <cmtice@google.com>

	PR libstdc++/99172
	* src/Makefile.am (AM_CXXFLAGS_PRE, AM_CXXFLAGS): Add
	AM_CXXFLAGS_PRE with the old definition of AM_CXXFLAGS; make
	AM_CXXFLAGS to be AM_CXXFLAGS_PRE with '-fvtable-verify=std'
	filtered out.
	* src/Makefile.in: Regenerate.

2021-03-11  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_to_chars.cc: Simplify the file as if
	__SIZEOF_INT128__ is always defined.
	[!defined __SIZEOF_INT128__]: Include "uint128_t.h".  Define
	a base-10 to_chars overload for the uint128_t class type.
	* src/c++17/uint128_t.h: New file.
	* testsuite/20_util/to_chars/long_double.cc: No longer expect an
	execution FAIL on targets that have a large long double type
	but lack __int128.

2021-03-11  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/ryu/LOCAL_PATCHES: Update.
	* src/c++17/ryu/d2s_intrinsics.h: Don't define uint128_t.
	* src/c++17/ryu/generic_128.h: Likewise.
	* src/c++17/ryu/ryu_generic_128.h (struct floating_decimal_128):
	Use uint128_t instead of __uint128_t.
	(generic_binary_to_decimal): Likewise.

2021-03-11  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/ryu/LOCAL_PATCHES: New file.

2021-03-11  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_to_chars.cc (uint128_t): New conditionally
	defined alias of unsigned __int128.
	(floating_type_traits_binary128::mantissa_t): Use uint128_t
	instead of unsigned __int128.
	(floating_type_traits<long double>::mantissa_t)
	[LONG_DOUBLE_KIND == LDK_IBM128]: Likewise.
	(get_ieee_repr): Likewise.  Make casts from uint_t to mantissa_t
	and uint32_t explicit.  Simplify the extraction of mantissa,
	exponent and sign bit.

2021-03-11  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/barrier (barrier::arrival_token): New move-only
	class that encapsulates the underlying token value.

2021-03-11  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (find_type): Use tag attribute
	instead of unqualified() method.

2021-03-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99537
	* include/std/stop_token (_Stop_state_t::_M_release_ownership):
	Use acq_rel memory ordering.

2021-03-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99533
	* src/c++17/fs_dir.cc (recursive_directory_iterator): Use new
	helper function to check for permission denied errors.
	* src/filesystem/dir.cc (recursive_directory_iterator):
	Likewise.
	* src/filesystem/dir-common.h (is_permission_denied_error): New
	helper function.

2021-03-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99536
	* include/bits/random.h (normal_distribution): Use
	default-initializer for _M_saved and _M_saved_available.

2021-03-10  John David Anglin  <danglin@gcc.gnu.org>

	* testsuite/29_atomics/atomic/wait_notify/bool.cc: Add options to
	link with libatomic.
	* 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/30_threads/barrier/arrive.cc: Likewise.
	* testsuite/30_threads/barrier/arrive_and_drop.cc: Likewise.
	* testsuite/30_threads/barrier/arrive_and_wait.cc: Likewise.
	* testsuite/30_threads/barrier/completion.cc: Likewise.
	* testsuite/30_threads/latch/3.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_until.cc: Likewise.

2021-03-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99413
	* include/bits/align.h: Include debug/assertions.h.
	* include/bits/codecvt.h: Include bits/c++config.h.
	* include/bits/enable_special_members.h: Likewise.
	* include/bits/erase_if.h: Likewise.
	* include/bits/functional_hash.h: Include <type_traits>.
	* include/bits/invoke.h: Include bits/move.h.
	* include/bits/ostream_insert.h: Include bits/exception_defines.h.
	* include/bits/parse_numbers.h: Include <type_traits>.
	* include/bits/predefined_ops.h: Include bits/c++config.h.
	* include/bits/range_access.h: Include bits/stl_iterator.h.
	* include/bits/stl_bvector.h: Do not include bits/stl_vector.h.
	* include/bits/stl_iterator.h: Include bits/stl_iterator_base_types.h.
	* include/bits/stl_uninitialized.h: Include bits/stl_algobase.h.
	* include/bits/uniform_int_dist.h: Include bits/concept_check.h.
	* include/bits/unique_lock.h: Include bits/std_mutex.h.
	* include/debug/assertions.h: Include bits/c++config.h.

2021-03-10  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_cmp.h (__eq_builtin_ptr_cmp): Remove.
	(ranges::equal_to, ranges::not_equal_to): Do not constrain
	with __eq_builtin_ptr_cmp.
	(ranges::less, ranges::greater, ranges::less_equal)
	(ranges::greater_equal): Do not constrain with
	__less_builtin_ptr_cmp.
	* libsupc++/compare (compare_three_way): Do not constrain with
	__3way_builtin_ptr_cmp.
	* testsuite/18_support/comparisons/object/builtin-ptr-three-way.cc: Moved to...
	* testsuite/18_support/comparisons/object/lwg3530.cc: ...here.
	* testsuite/20_util/function_objects/range.cmp/lwg3530.cc: New test.

2021-03-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/std/time/syn_c++20.cc: Enable synopsis checks for
	C++20 calendar types.

2021-03-06  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/99396
	* include/std/bit (__rotl, __rotr): Add optimized variants for power of
	two _Nd which the compiler can pattern match the rotates.

2021-03-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99382
	* testsuite/20_util/specialized_algorithms/uninitialized_default_n/sizes.cc:
	Make storage larger than required. Verify no write to the last
	element.
	* testsuite/20_util/specialized_algorithms/uninitialized_value_construct_n/sizes.cc:
	Likewise.

2021-03-03  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.

2021-03-03  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* include/experimental/bits/simd.h: Replace reserved _X, _B by
	_Xp, _Bp.
	* include/experimental/bits/simd_builtin.h: Likewise.
	* include/experimental/bits/simd_x86.h: Likewise.

2021-02-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99301
	* include/std/chrono (year_month_day::_M_days_since_epoch()):
	Convert chrono::month and chrono::day to unsigned before
	converting to uint32_t.

2021-02-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/chrono (year_month_day::_S_from_days): Perform
	all calculations with type uint32_t.

2021-02-25  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/abi.xml: Document versioning for GCC 11.
	* doc/html/manual/abi.html: Regenerate.

2021-02-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99270
	* testsuite/27_io/headers/cstdio/types_std.cc: Use pointer to
	FILE instead of FILE.

2021-02-25  Andreas Schwab  <schwab@suse.de>

	* config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/ia64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/m68k-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/riscv64-linux-gnu/baseline_symbols.txt: Update.

2021-02-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99265
	* include/std/chrono (year_month_day::_S_from_days): Cast long
	to int explicitly.

2021-02-25  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/utility (to_underlying): Define.
	* include/std/version (__cpp_lib_to_underlying): Define.
	* testsuite/20_util/to_underlying/1.cc: New test.
	* testsuite/20_util/to_underlying/version.cc: New test.

2021-02-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99261
	* src/c++17/floating_to_chars.cc (sprintf_ld): Add extra args
	before value to be printed.

2021-02-24  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_to_chars.cc (__floating_to_chars_precision):
	Relax the condition that guards the printf code path to accept
	F128_type as well as long double.

2021-02-24  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (year_month_day_last:day): New
	implementation.

2021-02-24  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (year::is_leap): New implementation.
	* testsuite/std/time/year/2.cc: New test.

2021-02-24  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (year_month_day::_M_days_since_epoch):
	New implementation.
	* testsuite/std/time/year_month_day/4.cc: New test.

2021-02-24  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (year_month_day::_S_from_days): New
	implementation.
	* testsuite/std/time/year_month_day/3.cc: New test.

2021-02-24  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/98384
	* testsuite/20_util/to_chars/long_double.cc: Include <optional>.
	(test01): Simplify verifying the nearby values by using a
	2-iteration loop and a dedicated output buffer to check that the
	nearby values are different.  Factor out the printf-based
	verification into a local function, and check that the leading
	hex digits agree before comparing to the output of printf.  Also
	verify the output by round-tripping it through from_chars.

2021-02-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98389
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.29): Do not match to_chars
	symbols for long double arguments mangled as 'g'.
	* config/os/gnu-linux/ldbl-extra.ver: Likewise.
	* config/os/gnu-linux/ldbl-ieee128-extra.ver: Likewise.
	* src/c++17/Makefile.am [GLIBCXX_LDBL_ALT128_COMPAT_TRUE]:
	Use -mabi=ibmlongdouble for floating_to_chars.cc.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/floating_to_chars.cc (floating_type_traits_binary128):
	New type defining type traits of IEEE binary128 format.
	(floating_type_traits<__float128>): Define specialization.
	(floating_type_traits<long double>): Define in terms of
	floating_type_traits_binary128 when appropriate.
	(floating_to_shortest_scientific): Handle __float128.
	(sprintf_ld): New function template for printing a long double
	or __ieee128 value using sprintf.
	(__floating_to_chars_shortest, __floating_to_chars_precision):
	Use sprintf_ld.
	(to_chars): Define overloads for __float128.

2021-02-24  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/17_intro/names.cc: Undefine 'u' on powerpc*-linux*.

2021-02-23  Martin Sebor  <msebor@redhat.com>

	PR c++/99074
	* libsupc++/dyncast.cc (__dynamic_cast): Return null when
	first argument is null.

2021-02-23  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/99181
	* testsuite/21_strings/char_traits/requirements/char/99181.cc: New
	test.

2021-02-23  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/99181
	* include/bits/char_traits.h (char_traits<char>::compare): For
	constexpr evaluation don't call
	__gnu_cxx::char_traits<char_type>::compare but do the comparison loop
	directly.

2021-02-23  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/97549
	* include/pstl/parallel_backend_serial.h: Remove __pstl::__par_backend.

2021-02-23  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/98384
	* src/c++17/floating_to_chars.cc (get_ieee_repr): Extract
	the high- and low-order parts from an IBM long double value
	in an endian-agnostic way.

2021-02-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_wait.h (__thread_relax()): Call
	__thread_yield() not __gthread_yield().

2021-02-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/atomic_wait.h (__thread_yield()): Check
	_GLIBCXX_HAS_GTHREADS before using __gthread_yield.
	(__thread_relax()): Use __thread_yield() instead of repeating
	the preprocessor checks for __gthread_yield.

2021-02-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/mutex (once_flag::_M_activate()): Add explicit
	return statement for passive case.
	(once_flag::_M_finish(bool)): Use reserved name for parameter.

2021-02-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99096
	* testsuite/util/testsuite_fs.h: Always include <unistd.h>.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88881
	* src/c++17/fs_ops.cc (fs::symlink_status): Re-enable workaround.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2014.xml: Document implementation
	specific properties of std::experimental::filesystem::rename.
	* doc/xml/manual/status_cxx2017.xml: Document implementation
	specific properties of std::filesystem::rename.
	* doc/html/*: Regenerate.
	* src/c++17/fs_ops.cc (fs::rename): Implement correct behaviour
	for directories on Windows.
	* src/filesystem/ops-common.h (__gnu_posix::rename): Use
	MoveFileExW on Windows.
	* testsuite/27_io/filesystem/operations/rename.cc: New test.
	* testsuite/experimental/filesystem/operations/rename.cc: New test.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_fs.h (nonexistent_path): Add
	random number to the path.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/internet (address_v6::to_string): Include
	scope ID in string.
	* testsuite/experimental/net/internet/address/v6/members.cc:
	Test to_string() results.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/internet (address_v6::any): Avoid using
	memcpy in constexpr function.
	(address_v6::loopback): Likewise.
	(make_address_v6): Fix missing return statements on error paths.
	* include/experimental/io_context: Avoid -Wdangling-else
	warning.
	* testsuite/experimental/net/internet/address/v4/members.cc:
	Remove unused variables.
	* testsuite/experimental/net/internet/address/v6/members.cc:
	New test.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_base.h (__shared_ptr::_M_get_deleter):
	Add unused attribute to parameter.
	* src/c++11/shared_ptr.cc (_Sp_make_shared_tag::_S_eq):
	Likewise.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_ostream/emit/1.cc: Expect test to fail
	if -fno-rtti is used.
	* testsuite/30_threads/async/forced_unwind.cc: Expect test
	to abort if -fno-rtti is used.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_allocator.h (memory_resource):
	Remove requirement for RTTI and exceptions to be enabled.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_istringstream/rdbuf/char/2832.cc: Use
	static_cast when RTTI is disabled.
	* testsuite/27_io/basic_istringstream/rdbuf/wchar_t/2832.cc:
	Likewise.
	* testsuite/27_io/basic_ostringstream/rdbuf/char/2832.cc:
	Likewise.
	* testsuite/27_io/basic_ostringstream/rdbuf/wchar_t/2832.cc:
	Likewise.
	* testsuite/27_io/basic_stringstream/str/char/2.cc:
	Likewise.
	* testsuite/27_io/basic_stringstream/str/wchar_t/2.cc:
	Likewise.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/ostream (__syncbuf_base::_S_get): Mark parameter
	as unused and only use dynamic_cast when RTTI is enabled.

2021-02-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99077
	* src/c++11/cxx11-ios_failure.cc (__ios_failure(const char*, int)):
	Change int parameter to error_code, to match std::ios_failure.
	(__throw_ios_failure(const char*, int)): Construct error_code
	from int parameter.

2021-02-11  Jonathan Wakely  <jwakely@redhat.com>

	* libsupc++/eh_ptr.cc (_GLIBCXX_EH_PTR_RELOPS_COMPAT): Define
	new macro.
	* libsupc++/exception_ptr.h (_GLIBCXX_EH_PTR_USED): Check new
	macro instead of _GLIBCXX_EH_PTR_COMPAT.
	(operator==): Likewise.

2021-02-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99058
	* doc/xml/manual/status_cxx2011.xml: Document when support
	became stable.
	* doc/xml/manual/status_cxx2014.xml: Likewise.
	* doc/xml/manual/status_cxx2017.xml: Likewise.
	* doc/html/manual/status.html: Regenerate.

2021-02-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88881
	* src/c++17/fs_ops.cc (fs::status): Re-enable workaround.

2021-02-10  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_ops.cc (fs::create_hard_link, fs::equivalent)
	(fs::remove): Use std::system_category() for error codes from
	GetLastError().
	* src/filesystem/ops.cc (fs::create_hard_link, fs::remove):
	Likewise.

2021-02-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/operations/proximate.cc: Fix typo
	in __MINGW32__ macro name.
	* testsuite/27_io/filesystem/path/compare/lwg2936.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/proximate.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/generation/relative.cc:
	Likewise.
	* testsuite/util/testsuite_fs.h: Likewise.

2021-02-09  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_tree.h
	(__has_is_transparent, __has_is_transparent_t): Move...
	* include/bits/stl_function.h: ...here.
	* include/bits/hashtable_policy.h (_Hash_code_base<>::_M_hash_code_tr): New..
	(_Hashtable_base<>::_M_equals_tr): New.
	* include/bits/hashtable.h (_Hashtable<>::_M_find_tr, _Hashtable<>::_M_count_tr,
	_Hashtable<>::_M_equal_range_tr): New member function templates to perform
	heterogeneous lookup.
	(_Hashtable<>::_M_find_before_node_tr): New.
	(_Hashtable<>::_M_find_node_tr): New.
	* include/bits/unordered_map.h (unordered_map::find<>, unordered_map::count<>,
	unordered_map::contains<>, unordered_map::equal_range<>): New member function
	templates to perform heterogeneous lookup.
	(unordered_multimap::find<>, unordered_multimap::count<>,
	unordered_multimap::contains<>, unordered_multimap::equal_range<>): Likewise.
	* include/bits/unordered_set.h  (unordered_set::find<>, unordered_set::count<>,
	unordered_set::contains<>, unordered_set::equal_range<>): Likewise.
	(unordered_multiset::find<>, unordered_multiset::count<>,
	unordered_multiset::contains<>, unordered_multiset::equal_range<>): Likewise.
	* include/debug/unordered_map
	(unordered_map::find<>, unordered_map::equal_range<>): Likewise.
	(unordered_multimap::find<>, unordered_multimap::equal_range<>): Likewise.
	* include/debug/unordered_set
	(unordered_set::find<>, unordered_set::equal_range<>): Likewise.
	(unordered_multiset::find<>, unordered_multiset::equal_range<>): Likewise.
	* testsuite/23_containers/unordered_map/operations/1.cc: New test.
	* testsuite/23_containers/unordered_multimap/operations/1.cc: New test.
	* testsuite/23_containers/unordered_multiset/operations/1.cc: New test.
	* testsuite/23_containers/unordered_set/operations/1.cc: New test.

2021-02-09  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/stl_deque.h
	(std::operator-(deque::iterator, deque::iterator)): Replace if/then with
	a null pointer test.

2021-02-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/operations/remove_all.cc: Remove
	test directory after making it writable again.
	* testsuite/experimental/filesystem/operations/remove_all.cc:
	Likewise.

2021-02-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99021
	* include/std/coroutine (coroutine_handle<P>::from_address): Add
	noexcept.

2021-02-09  Vladimir Vishnevsky  <vv.os.swe@gmail.com>

	* include/ext/stdio_sync_filebuf.h: Remove unused <unistd.h>.
	* src/c++17/fs_ops.cc (fs::permissions): Qualify mode_t.

2021-02-09  Jakub Jelinek  <jakub@redhat.com>

	PR middle-end/98465
	* include/bits/basic_string.tcc (basic_string::_M_replace): When __s
	points to the characters moved by earlier _S_move, compute the source
	address using expression based on the __p pointer rather than __s
	pointer.

2021-02-03  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/19_diagnostics/error_code/operators/not_equal.cc:
	Add comparison with same category and different values.
	* testsuite/19_diagnostics/error_code/operators/less.cc:
	Likewise. Fix comparison involving different categories.
	* testsuite/19_diagnostics/error_code/operators/three_way.cc:
	Likewise.
	* testsuite/19_diagnostics/error_condition/operators/less.cc:
	Add comment.
	* testsuite/19_diagnostics/error_condition/operators/three_way.cc:
	Likewise.

2021-02-03  yaozhongxiao  <yaozhongxiao@linux.alibaba.com>

	* include/experimental/bits/simd_neon.h: Replace repeated vpadd
	calls with a single vaddv for aarch64.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/Makefile.am: Warn about the workaround. Add
	-fno-tree-vrp to CXXFLAGS passed to the check_simd script.
	Improve initial user feedback from make check-simd.
	* testsuite/Makefile.in: Regenerated.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* include/experimental/bits/simd.h: Add __detail::_Minimum and
	__detail::_Maximum to use them as _BinaryOperation to _S_reduce.
	Add hmin and hmax overloads for simd and const_where_expression.
	* include/experimental/bits/simd_scalar.h
	(_SimdImplScalar::_S_reduce): Make unused _BinaryOperation
	parameter const-ref to allow calling _S_reduce with an rvalue.
	* testsuite/experimental/simd/tests/reductions.cc: Add tests for
	hmin and hmax. Since the compiler statically determined that all
	tests pass, repeat the test after a call to make_value_unknown.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/tests/bits/verify.h (verify): Add
	instruction pointer data member. Ensure that the `if (m_failed)`
	branch is always inlined into the calling code. The body of the
	conditional can still be a function call. Move the get_ip call
	into the verify ctor to simplify the ctor calls.
	(COMPARE): Don't mention the use of all_of for reduction of a
	simd_mask. It only distracts from the real issue.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/driver.sh: Abstract reading test
	options into read_src_option function. Read skip, only,
	expensive, and xfail via read_src_option. Add timeout and
	timeout-factor options and adjust timeout variable accordingly.
	* testsuite/experimental/simd/tests/loadstore.cc: Set
	timeout-factor 2.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/driver.sh: When handling the pipe
	to log (and on verbose to stdout) count the lines. If it exceeds
	1000 log the issue and exit 125, which is then handled as a
	failure.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/tests/hypot3_fma.cc: Add skip:
	markup for long double on powerpc64*.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* include/experimental/bits/simd.h: Add __have_power10vec
	conditional on _ARCH_PWR10.
	* include/experimental/bits/simd_builtin.h: Forward declare
	_MaskImplPpc and use it as _MaskImpl when __ALTIVEC__ is
	defined.
	(_MaskImplBuiltin::_S_some_of): Call _S_popcount from the
	_SuperImpl for optimizations and correctness.
	* include/experimental/bits/simd_ppc.h: Add _MaskImplPpc.
	(_MaskImplPpc::_S_popcount): Implement via vec_cntm for POWER10.
	Otherwise, for >=int use -vec_sums divided by a sizeof factor.
	For <int use -vec_sums(vec_sum4s(...)) to sum all mask entries.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/driver.sh: Remove executable on
	SIGINT. Process compiler and test executable output: In verbose
	mode print messages immediately, limited to 1000 lines and
	breaking long lines to below $COLUMNS (or 1024 if not set).
	Communicating the exit status of the compiler / test with the
	necessary pipe is done via a message through stdout/-in.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/Makefile.am: Ensure .simd.summary is empty before
	collecting a new summary.
	* testsuite/Makefile.in: Regenerate.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/generate_makefile.sh: Use
	different variables internally than documented for user
	overrides. This makes internal append/prepend work as intended.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/driver.sh (verify_test): Print
	test output on run xfail. Do not repeat lines from the log that
	were already printed on stdout.
	(test_selector): Make the compiler flags pattern usable as a
	substring selector.
	(toplevel): Trap on SIGINT and remove the log and sum files.
	Call timout with --foreground to quickly terminate on SIGINT.
	* testsuite/experimental/simd/generate_makefile.sh: Simplify run
	targets via target patterns. Default DRIVEROPTS to -v for run
	targets. Remove log and sum files after completion of the run
	target (so that it's always recompiled).
	Place help text into text file for reasonable 'make help'
	performance.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* include/experimental/bits/simd.h: Remove unnecessary static
	assertion. Allow sizeof(8) integer __intrinsic_type to enable
	the necessary mask type.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* include/experimental/bits/simd.h: Let __intrinsic_type<long
	double, N> be valid if sizeof(long double) == sizeof(double) and
	use a __vector double as member type.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* include/experimental/bits/simd.h (__is_intrinsic_type): New
	internal type trait. Alias for __is_vector_type on x86.
	(_VectorTraitsImpl): Enable for __intrinsic_type in addition for
	__vector_type.
	(__intrin_bitcast): Allow casting to & from vector & intrinsic
	types.
	(__intrinsic_type): Explicitly specialize for NEON intrinsic
	vector types.

2021-02-03  Matthias Kretz  <kretz@kde.org>

	* testsuite/experimental/simd/driver.sh: Implement skip, only,
	expensive, and xfail markers. They can select on type, ABI tag
	subset number, target-triplet, and compiler flags.
	* testsuite/experimental/simd/generate_makefile.sh: The summary
	now includes lines for unexpected passes and expected failures.
	If the skip or only markers are only conditional on the type, do
	not generate rules for those types.
	* testsuite/experimental/simd/tests/abs.cc: Mark test expensive
	for ABI tag subsets 1-9.
	* testsuite/experimental/simd/tests/algorithms.cc: Ditto.
	* testsuite/experimental/simd/tests/broadcast.cc: Ditto.
	* testsuite/experimental/simd/tests/casts.cc: Ditto.
	* testsuite/experimental/simd/tests/generator.cc: Ditto.
	* testsuite/experimental/simd/tests/integer_operators.cc: Ditto.
	* testsuite/experimental/simd/tests/loadstore.cc: Ditto.
	* testsuite/experimental/simd/tests/mask_broadcast.cc: Ditto.
	* testsuite/experimental/simd/tests/mask_conversions.cc: Ditto.
	* testsuite/experimental/simd/tests/mask_implicit_cvt.cc: Ditto.
	* testsuite/experimental/simd/tests/mask_loadstore.cc: Ditto.
	* testsuite/experimental/simd/tests/mask_operator_cvt.cc: Ditto.
	* testsuite/experimental/simd/tests/mask_operators.cc: Ditto.
	* testsuite/experimental/simd/tests/mask_reductions.cc: Ditto.
	* testsuite/experimental/simd/tests/operator_cvt.cc: Ditto.
	* testsuite/experimental/simd/tests/operators.cc: Ditto.
	* testsuite/experimental/simd/tests/reductions.cc: Ditto.
	* testsuite/experimental/simd/tests/simd.cc: Ditto.
	* testsuite/experimental/simd/tests/split_concat.cc: Ditto.
	* testsuite/experimental/simd/tests/splits.cc: Ditto.
	* testsuite/experimental/simd/tests/where.cc: Ditto.
	* testsuite/experimental/simd/tests/fpclassify.cc: Ditto. In
	addition replace "test only floattypes" marker by unconditional
	"float|double|ldouble" only marker.
	* testsuite/experimental/simd/tests/frexp.cc: Ditto.
	* testsuite/experimental/simd/tests/hypot3_fma.cc: Ditto.
	* testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc:
	Ditto.
	* testsuite/experimental/simd/tests/logarithm.cc: Ditto.
	* testsuite/experimental/simd/tests/math_1arg.cc: Ditto.
	* testsuite/experimental/simd/tests/math_2arg.cc: Ditto.
	* testsuite/experimental/simd/tests/remqo.cc: Ditto.
	* testsuite/experimental/simd/tests/trigonometric.cc: Ditto.
	* testsuite/experimental/simd/tests/trunc_ceil_floor.cc: Ditto.
	* testsuite/experimental/simd/tests/sincos.cc: Ditto. In
	addition, xfail on run because the reference data is missing.

2021-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2011.xml: Remove stray table cell.
	* doc/xml/manual/status_cxx2014.xml: Likewise.
	* doc/xml/manual/status_cxx2017.xml: Likewise.
	* doc/html/manual/status.html: Regenerate.

2021-02-01  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/70303
	* include/bits/stl_deque.h (std::deque<>::operator-(iterator, iterator)):
	Return 0 if both iterators are value-initialized.
	* testsuite/23_containers/deque/70303.cc: New test.
	* testsuite/23_containers/vector/70303.cc: New test.

2021-02-01  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2011.xml: Update std::call_once
	status.
	* doc/xml/manual/status_cxx2014.xml: Likewise.
	* doc/xml/manual/status_cxx2017.xml: Likewise. Update
	std::from_chars and std::to_chars status. Fix formatting.
	* doc/html/manual/status.html: Regenerate.

2021-01-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/numeric_traits.h: Update copyright
	dates.
	* include/experimental/bits/simd.h: Likewise.
	* include/experimental/bits/simd_builtin.h: Likewise.
	* include/experimental/bits/simd_converter.h: Likewise.
	* include/experimental/bits/simd_detail.h: Likewise.
	* include/experimental/bits/simd_fixed_size.h: Likewise.
	* include/experimental/bits/simd_math.h: Likewise.
	* include/experimental/bits/simd_neon.h: Likewise.
	* include/experimental/bits/simd_ppc.h: Likewise.
	* include/experimental/bits/simd_scalar.h: Likewise.
	* include/experimental/bits/simd_x86.h: Likewise.
	* include/experimental/bits/simd_x86_conversions.h: Likewise.
	* include/experimental/simd: Likewise.
	* testsuite/experimental/simd/*: Likewise.

2021-01-27  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2017.xml: Replace invalid entity.
	* doc/html/*: Regenerate.

2021-01-27  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/simd/generate_makefile.sh: Use printf
	instead of echo when printing escape characters.

2021-01-27  Matthias Kretz  <kretz@kde.org>

	* scripts/check_simd: New file. This script is called from the
	the check-simd target. It determines a set of compiler flags and
	simulator setups for calling generate_makefile.sh and passes the
	information back to the check-simd target, which recurses to the
	generated Makefiles.
	* scripts/create_testsuite_files: Remove files below simd/tests/
	from testsuite_files and place them in testsuite_files_simd.
	* testsuite/Makefile.am: Add testsuite_files_simd. Add
	check-simd target.
	* testsuite/Makefile.in: Regenerate.
	* testsuite/experimental/simd/driver.sh: New file. This script
	compiles and runs a given simd test, logging its output and
	status. It uses the timeout command to implement compile and
	test timeouts.
	* testsuite/experimental/simd/generate_makefile.sh: New file.
	This script generates a Makefile which uses driver.sh to compile
	and run the tests and collect the logs into a single log file.
	* testsuite/experimental/simd/tests/abs.cc: New file. Tests
	abs(simd).
	* testsuite/experimental/simd/tests/algorithms.cc: New file.
	Tests min/max(simd, simd).
	* testsuite/experimental/simd/tests/bits/conversions.h: New
	file. Contains functions to support tests involving conversions.
	* testsuite/experimental/simd/tests/bits/make_vec.h: New file.
	Support functions make_mask and make_vec.
	* testsuite/experimental/simd/tests/bits/mathreference.h: New
	file. Support functions to supply precomputed math function
	reference data.
	* testsuite/experimental/simd/tests/bits/metahelpers.h: New
	file. Support code for SFINAE testing.
	* testsuite/experimental/simd/tests/bits/simd_view.h: New file.
	* testsuite/experimental/simd/tests/bits/test_values.h: New
	file. Test functions to easily drive a test with simd objects
	initialized from a given list of values and a range of random
	values.
	* testsuite/experimental/simd/tests/bits/ulp.h: New file.
	Support code to determine the ULP distance of simd objects.
	* testsuite/experimental/simd/tests/bits/verify.h: New file.
	Test framework for COMPARE'ing simd objects and instantiating
	the test templates with value_type and ABI tag.
	* testsuite/experimental/simd/tests/broadcast.cc: New file. Test
	simd broadcasts.
	* testsuite/experimental/simd/tests/casts.cc: New file. Test
	simd casts.
	* testsuite/experimental/simd/tests/fpclassify.cc: New file.
	Test floating-point classification functions.
	* testsuite/experimental/simd/tests/frexp.cc: New file. Test
	frexp(simd).
	* testsuite/experimental/simd/tests/generator.cc: New file. Test
	simd generator constructor.
	* testsuite/experimental/simd/tests/hypot3_fma.cc: New file.
	Test 3-arg hypot(simd,simd,simd) and fma(simd,simd,sim).
	* testsuite/experimental/simd/tests/integer_operators.cc: New
	file. Test integer operators.
	* testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc:
	New file. Test ldexp(simd), scalbn(simd), scalbln(simd), and
	modf(simd).
	* testsuite/experimental/simd/tests/loadstore.cc: New file. Test
	(converting) simd loads and stores.
	* testsuite/experimental/simd/tests/logarithm.cc: New file. Test
	log*(simd).
	* testsuite/experimental/simd/tests/mask_broadcast.cc: New file.
	Test simd_mask broadcasts.
	* testsuite/experimental/simd/tests/mask_conversions.cc: New
	file. Test simd_mask conversions.
	* testsuite/experimental/simd/tests/mask_implicit_cvt.cc: New
	file. Test simd_mask implicit conversions.
	* testsuite/experimental/simd/tests/mask_loadstore.cc: New file.
	Test simd_mask loads and stores.
	* testsuite/experimental/simd/tests/mask_operator_cvt.cc: New
	file. Test simd_mask operators convert as specified.
	* testsuite/experimental/simd/tests/mask_operators.cc: New file.
	Test simd_mask compares, subscripts, and negation.
	* testsuite/experimental/simd/tests/mask_reductions.cc: New
	file. Test simd_mask reductions.
	* testsuite/experimental/simd/tests/math_1arg.cc: New file. Test
	1-arg math functions on simd.
	* testsuite/experimental/simd/tests/math_2arg.cc: New file. Test
	2-arg math functions on simd.
	* testsuite/experimental/simd/tests/operator_cvt.cc: New file.
	Test implicit conversions on simd binary operators behave as
	specified.
	* testsuite/experimental/simd/tests/operators.cc: New file. Test
	simd compares, subscripts, not, unary minus, plus, minus,
	multiplies, divides, increment, and decrement.
	* testsuite/experimental/simd/tests/reductions.cc: New file.
	Test reduce(simd).
	* testsuite/experimental/simd/tests/remqo.cc: New file. Test
	remqo(simd).
	* testsuite/experimental/simd/tests/simd.cc: New file. Basic
	sanity checks of simd types.
	* testsuite/experimental/simd/tests/sincos.cc: New file. Test
	sin(simd) and cos(simd).
	* testsuite/experimental/simd/tests/split_concat.cc: New file.
	Test split(simd) and concat(simd, simd).
	* testsuite/experimental/simd/tests/splits.cc: New file. Test
	split(simd_mask).
	* testsuite/experimental/simd/tests/trigonometric.cc: New file.
	Test remaining trigonometric functions on simd.
	* testsuite/experimental/simd/tests/trunc_ceil_floor.cc: New
	file. Test trunc(simd), ceil(simd), and floor(simd).
	* testsuite/experimental/simd/tests/where.cc: New file. Test
	masked operations using where.

2021-01-27  Matthias Kretz  <kretz@kde.org>

	* doc/xml/manual/status_cxx2017.xml: Add implementation status
	of the Parallelism TS 2. Document implementation-defined types
	and behavior.
	* include/Makefile.am: Add new headers.
	* include/Makefile.in: Regenerate.
	* include/experimental/simd: New file. New header for
	Parallelism TS 2.
	* include/experimental/bits/numeric_traits.h: New file.
	Implementation of P1841R1 using internal naming. Addition of
	missing IEC559 functionality query.
	* include/experimental/bits/simd.h: New file. Definition of the
	public simd interfaces and general implementation helpers.
	* include/experimental/bits/simd_builtin.h: New file.
	Implementation of the _VecBuiltin simd_abi.
	* include/experimental/bits/simd_converter.h: New file. Generic
	simd conversions.
	* include/experimental/bits/simd_detail.h: New file. Internal
	macros for the simd implementation.
	* include/experimental/bits/simd_fixed_size.h: New file. Simd
	fixed_size ABI specific implementations.
	* include/experimental/bits/simd_math.h: New file. Math
	overloads for simd.
	* include/experimental/bits/simd_neon.h: New file. Simd NEON
	specific implementations.
	* include/experimental/bits/simd_ppc.h: New file. Implement bit
	shifts to avoid invalid results for integral types smaller than
	int.
	* include/experimental/bits/simd_scalar.h: New file. Simd scalar
	ABI specific implementations.
	* include/experimental/bits/simd_x86.h: New file. Simd x86
	specific implementations.
	* include/experimental/bits/simd_x86_conversions.h: New file.
	x86 specific conversion optimizations. The conversion patterns
	work around missing conversion patterns in the compiler and
	should be removed as soon as PR85048 is resolved.
	* testsuite/experimental/simd/standard_abi_usable.cc: New file.
	Test that all (not all fixed_size<N>, though) standard simd and
	simd_mask types are usable.
	* testsuite/experimental/simd/standard_abi_usable_2.cc: New
	file. As above but with -ffast-math.
	* testsuite/libstdc++-dg/conformance.exp: Don't build simd tests
	from the standard test loop. Instead use
	check_vect_support_and_set_flags to build simd tests with the
	relevant machine flags.

2021-01-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/66414
	* include/bits/string_view.tcc
	(basic_string_view::find(const CharT*, size_type, size_type)):
	Optimize.

2021-01-27  Paul Fee  <paul.f.fee@gmail.com>

	* include/bits/basic_string.h (basic_string::contains): New
	member functions.
	* include/std/string_view (basic_string_view::contains):
	Likewise.
	* include/std/version (__cpp_lib_string_contains): Define.
	* testsuite/21_strings/basic_string/operations/starts_with/char/1.cc:
	Remove trailing whitespace.
	* testsuite/21_strings/basic_string/operations/starts_with/wchar_t/1.cc:
	Likewise.
	* testsuite/21_strings/basic_string/operations/contains/char/1.cc: New test.
	* testsuite/21_strings/basic_string/operations/contains/wchar_t/1.cc: New test.
	* testsuite/21_strings/basic_string_view/operations/contains/char/1.cc: New test.
	* testsuite/21_strings/basic_string_view/operations/contains/char/2.cc: New test.
	* testsuite/21_strings/basic_string_view/operations/contains/wchar_t/1.cc: New test.

2021-01-21  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/Makefile.in: Regenerate.

2021-01-20  David Edelsohn  <dje.gcc@gmail.com>

	* config/os/aix/ctype_inline.h (bool ctype<char>:: is): Cast
	_OBJ_DATA subscript to unsigned char. Add _THREAD_SAFE access to
	__lc_type.
	(const char* ctype<char>:: is): Same.

2021-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98725
	* testsuite/20_util/unique_ptr/io/lwg2948.cc:  Do not try to
	write to a wide character stream if wide character support is
	disabled in the library.

2021-01-18  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/basic_stringstream/cons/char/1.cc: Use
	stringbuf not wstringbuf.

2021-01-18  Jakub Jelinek  <jakub@redhat.com>

	PR debug/98708
	* src/c++11/Makefile.am (cxx11-ios_failure-lt.s, cxx11-ios_failure.s):
	Compile with -gno-as-loc-support.
	* src/c++11/Makefile.in: Regenerated.

2021-01-16  H.J. Lu  <hjl.tools@gmail.com>

	* testsuite/29_atomics/atomic_flag/test_and_set/explicit-hle.cc:
	Add -fcf-protection=none to -march=i486.

2021-01-14  François Dumont  <fdumont@gcc.gnu.org>

	* testsuite/23_containers/deque/debug/98466.cc: Make it pre-C++11
	compliant.

2021-01-14  Alexandre Oliva  <oliva@adacore.com>

	* testsuite/30_threads/future/members/poll.cc: Calibrate
	iteration count.

2021-01-14  François Dumont  <fdumont@gcc.gnu.org>

	PR libstdc++/98466
	* include/bits/hashtable_policy.h (_Node_iterator_base()): Set _M_cur to nullptr.
	(_Node_iterator()): Make default.
	(_Node_const_iterator()): Make default.
	* include/debug/macros.h (__glibcxx_check_erae_range_after): Add _M_singular
	iterator checks.
	* include/debug/safe_iterator.h
	(_GLIBCXX_DEBUG_VERIFY_OPERANDS): Accept if both iterator are value initialized.
	* include/debug/safe_local_iterator.h (_GLIBCXX_DEBUG_VERIFY_OPERANDS):
	Likewise.
	* include/debug/safe_iterator.tcc (_Safe_iterator<>::_M_valid_range): Add
	_M_singular checks on input iterators.
	* src/c++11/debug.cc (_Safe_iterator_base::_M_can_compare): Remove _M_singular
	checks.
	* testsuite/23_containers/deque/debug/98466.cc: New test.
	* testsuite/23_containers/unordered_map/debug/98466.cc: New test.

2021-01-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/98471
	* include/bits/fs_path.h (__throw_conversion_error): New
	function to throw or abort on character conversion errors.
	(__wstr_from_utf8): Move definition after filesystem_error has
	been defined. Use __throw_conversion_error.
	(path::_S_convert<_EcharT>): Use __throw_conversion_error.
	(path::_S_str_convert<_CharT, _Traits, _Allocator>): Likewise.
	(path::u8string): Likewise.

2021-01-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/barrier: Update copyright years. Fix whitespace.
	* include/std/version: Fix whitespace.
	* testsuite/30_threads/barrier/1.cc: Update copyright years.
	* testsuite/30_threads/barrier/2.cc: Likewise.
	* testsuite/30_threads/barrier/arrive.cc: Likewise.
	* testsuite/30_threads/barrier/arrive_and_drop.cc: Likewise.
	* testsuite/30_threads/barrier/arrive_and_wait.cc: Likewise.
	* testsuite/30_threads/barrier/completion.cc: Likewise.

2021-01-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (INPUT): Remove include/debug/array.

2021-01-10  David Edelsohn  <dje.gcc@gmail.com>

	PR libstdc++/98613
	* testsuite/ext/vstring/cons/moveable.cc: Suppress false positive
	warning.
	* testsuite/ext/vstring/modifiers/assign/move_assign.cc: Same.

2021-01-08  Olivier Hainque  <hainque@adacore.com>

	* testsuite/20_util/bind/ref_neg.cc: Tweak the
	dg-prune-output regex for out-of-build-tree contexts.

2021-01-07  Thomas Rodgers  <trodgers@redhat.com>

	* doc/doxygen/user.cfg.in: Add new header.
	* include/Makefile.am (std_headers): likewise.
	* include/Makefile.in: Regenerate.
	* include/precompiled/stdc++.h: Add new header.
	* include/std/barrier: New file.
	* include/std/version: Add __cpp_lib_barrier feature test macro.
	* testsuite/30_threads/barrier/1.cc: New test.
	* testsuite/30_threads/barrier/2.cc: Likewise.
	* testsuite/30_threads/barrier/arrive_and_drop.cc: Likewise.
	* testsuite/30_threads/barrier/arrive_and_wait.cc: Likewise.
	* testsuite/30_threads/barrier/arrive.cc: Likewise.
	* testsuite/30_threads/barrier/completion.cc: Likewise.

2021-01-07  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/98384
	* testsuite/20_util/to_chars/long_double.cc: Use nexttowardl
	instead of the non-standard nextupl and nextdownl.

2021-01-05  Samuel Thibault  <samuel.thibault@ens-lyon.org>

	* configure: Re-generate.

2021-01-05  Ed Smith-Rowland  <3dw4rd@verizon.net>

	* include/precompiled/stdc++.h: Add <source_location> to C++20 section.

2021-01-01  Jakub Jelinek  <jakub@redhat.com>

	* ChangeLog-2020: Rotate ChangeLog.  New file.


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