2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-05-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/experimental/feat-cxx14.cc: Remove dependency on
	_GLIBCXX_USE_C99_STDINT_TR1.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-05-12  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string_view/typedefs.cc: Remove
	dependency on _GLIBCXX_USE_C99_STDINT_TR1.
	* testsuite/experimental/string_view/typedefs.cc: Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-11  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/Makefile.am: Add new file.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++11/debug.cc (__glibcxx_assert_fail): Move to ...
	* src/c++11/assert_fail.cc: New file.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-06-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/iterator_concepts.h (projected): Replace class
	template with alias template denoting an ADL-proofed helper.
	(incremental_traits<projected<Iter, Proj>>): Remove.
	* testsuite/24_iterators/indirect_callable/projected-adl.cc:
	New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/40380
	* include/bits/basic_string.h: Improve doxygen comments.
	* include/bits/cow_string.h: Likewise.
	* include/bits/forward_list.h: Likewise.
	* include/bits/fs_dir.h: Likewise.
	* include/bits/fs_path.h: Likewise.
	* include/bits/quoted_string.h: Likewise.
	* include/bits/stl_bvector.h: Likewise.
	* include/bits/stl_map.h: Likewise.
	* include/bits/stl_multimap.h: Likewise.
	* include/bits/stl_multiset.h: Likewise.
	* include/bits/stl_set.h: Likewise.
	* include/bits/stl_vector.h: Likewise.
	* include/bits/unordered_map.h: Likewise.
	* include/bits/unordered_set.h: Likewise.
	* include/std/filesystem: Likewise.
	* include/std/iomanip: Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ptr_traits.h (pointer_traits::pointer_to): Rename
	parameter.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/tuple: Add better Doxygen comments.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-08  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/18_support/new_nothrow.cc: Add missing noexcept
	to operator delete replacements.
	* testsuite/20_util/any/cons/92156.cc: Disable
	-Winit-list-lifetime warnings from instantiating invalid
	specialization of manager function.
	* testsuite/20_util/any/modifiers/92156.cc: Likewise.
	* testsuite/20_util/default_delete/void_neg.cc: Prune additional
	diagnostics.
	* testsuite/20_util/headers/memory/synopsis.cc: Add missing
	noexcept.
	* testsuite/20_util/shared_ptr/cons/void_neg.cc: Prune
	additional diagnostic.
	* testsuite/20_util/unique_ptr/creation/for_overwrite.cc: Add
	missing noexcept to operator delete replacements.
	* testsuite/21_strings/basic_string/cons/char/103919.cc:
	Likewise.
	* testsuite/23_containers/map/modifiers/emplace/92300.cc:
	Likewise.
	* testsuite/23_containers/map/modifiers/insert/92300.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/range_access_c++11.cc:
	Add missing noexcept to synopsis declarations.
	* testsuite/24_iterators/headers/iterator/range_access_c++14.cc:
	Likewise.
	* testsuite/24_iterators/headers/iterator/range_access_c++17.cc:
	Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-21  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/headers/memory/synopsis.cc: Add declarations
	from C++11 and later.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_tempbuf.h (_Temporary_buffer): Disable
	warnings about get_temporary_buffer being deprecated.
	* include/ext/functional (mem_fun1, mem_fun1_ref): Disable
	warnings about mem_fun1_t, const_mem_fun1_t, mem_fun1_ref_t and
	const_mem_fun1_ref_t being deprecated.
	* include/std/spanstream (basic_spanbuf::setbuf): Add assertion
	and adjust to avoid narrowing warning.
	* libsupc++/exception_ptr.h [!__cpp_rtti && !__cpp_exceptions]
	(make_exception_ptr): Add missing inline specifier.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (PREDEFINED): Define
	_GTHREAD_USE_MUTEX_TIMEDLOCK macro.
	* include/bits/std_mutex.h (mutex, lock_guard): Use @since and
	@headerfile.
	* include/bits/unique_lock.h (unique_lock): Likewise.
	* include/std/mutex (recursive_mutex, timed_mutex)
	(recursive_timed_mutex, scoped_lock): Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (PREDEFINED): Define
	_GLIBCXX23_CONSTEXPR macro.
	* include/backward/auto_ptr.h (auto_ptr): Use @deprecated.
	* include/bits/unique_ptr.h (default_delete): Use @since and
	@headerfile.
	* include/std/scoped_allocator: Remove @ingroup from @file
	block.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ostream_insert.h: Mark helper functions as
	undocumented by Doxygen.
	* include/bits/stl_algo.h: Use markdown for formatting and mark
	helper functions as undocumented.
	* include/bits/stl_numeric.h:  Likewise.
	* include/bits/stl_pair.h (pair): Add @headerfile.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (PREDEFINED): Define __allocator_base
	so that Doxygen shows the right base-class for std::allocator.
	* include/bits/alloc_traits.h: Improve doxygen docs.
	* include/bits/allocator.h: Likewise.
	* include/bits/new_allocator.h: Likewise.
	* include/ext/new_allocator.h: Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (PREDEFINED): Define macro
	_GLIBCXX_DOXYGEN_ONLY to expand its argument.
	* include/bits/c++config (_GLIBCXX_DOXYGEN_ONLY): Define.
	* include/bits/regex.h: Improve doxygen docs.
	* include/bits/regex_constants.h: Likewise.
	* include/bits/regex_error.h: Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/atomic: Suppress doxygen docs for
	implementation details.
	* include/bits/atomic_base.h: Likewise.
	* include/bits/shared_ptr_atomic.h: Use markdown. Fix grouping
	so that std::atomic is not added to the pointer abstractions
	group.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-17  Jonathan Wakely  <jwakely@redhat.com>

	* src/Makefile.am [ENABLE_SYMVERS_GNU_NAMESPACE] (cxx11_sources):
	Do not build the compatibility*-c++0x.cc objects.
	* src/Makefile.in: Regenerate.
	* src/c++11/compatibility-c++0x.cc [_GLIBCXX_INLINE_VERSION]:
	Refuse to build for the versioned namespace.
	* src/c++11/compatibility-chrono.cc: Likewise.
	* src/c++11/compatibility-condvar.cc: Likewise.
	* src/c++11/compatibility-thread-c++0x.cc: Likewise.
	* src/c++11/chrono.cc (system_clock, steady_clock):
	Use macros to define in inline namespace _V2, matching the
	declarations in <system_error>.
	* src/c++11/system_error.cc (system_category, generic_category):
	Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (PREDEFINED): Expand new macros to
	nothing.
	* include/bits/c++config (_GLIBCXX_BEGIN_INLINE_ABI_NAMESPACE)
	(_GLIBCXX_END_INLINE_ABI_NAMESPACE): Define new macros.
	* include/bits/algorithmfwd.h (_V2::__rotate): Use new macros
	for the namespace.
	* include/bits/chrono.h (chrono::_V2::system_clock): Likewise.
	* include/bits/stl_algo.h (_V2::__rotate): Likewise.
	* include/std/condition_variable (_V2::condition_variable_any):
	Likewise.
	* include/std/system_error (_V2::error_category): Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (GROUP_NESTED_COMPOUNDS): Set to NO.
	(CLASS_DIAGRAMS): Remove obsolete option.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (__is_path_iter_src): Replace class
	template with variable template.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ptr_traits.h (__ptr_traits_elem) [__cpp_concepts]:
	Also define the __ptr_traits_elem class template for the
	concepts case.
	(pointer_traits<Ptr>): Remove constrained partial
	specialization.
	* testsuite/20_util/pointer_traits/lwg3545.cc: Check for
	ambiguitiy with program-defined partial specialization.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-24  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/alloc_traits.h (allocator_traits::is_always_equal):
	Only instantiate is_empty if needed.
	* include/bits/ptr_traits.h (__ptr_traits_impl::difference_type)
	(__ptr_traits_impl::rebind): Use __detected_or.
	* include/experimental/type_traits (is_same_v): Add a partial
	specialization instead of instantiating the std::is_same class
	template.
	(detected_t): Redefine in terms of detected_or_t.
	(is_detected, is_detected_v): Redefine in terms of detected_t.
	* include/std/type_traits [__cpp_concepts] (__detected_or): Add
	new definition using concepts.
	(__detector::value_t): Rename to __is_detected.
	* testsuite/17_intro/names.cc: Check value_t isn't used.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ptr_traits.h: Add some doxygen comments.

2024-03-18  Xi Ruoyao  <xry111@xry111.site>

	Backported from master:
	2022-06-24  Xi Ruoyao  <xry111@xry111.site>

	* scripts/extract_symvers.in: Use grep -E instead of egrep.
	* scripts/run_doxygen: Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-10-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107376
	* include/bits/regex_executor.h (_Executor::_Executor): Use same
	allocator for _M_cur_results and _M_results.
	* include/bits/regex_executor.tcc (_Executor::_M_main_dispatch):
	Prevent possibly incorrect allocator propagating to
	_M_cur_results.
	* testsuite/28_regex/algorithms/regex_match/107376.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/sstream  (basic_stringbuf::view): Define for old
	std::string ABI.
	(basic_istringstream::view, basic_stringstream::view)
	(basic_stringstream::view): Likewise.
	* testsuite/27_io/basic_istringstream/view/char/1.cc: Remove
	{ dg-require-effective-target cxx11_abi }.
	* testsuite/27_io/basic_istringstream/view/wchar_t/1.cc:
	Likewise.
	* testsuite/27_io/basic_ostringstream/view/char/1.cc: Likewise.
	* testsuite/27_io/basic_ostringstream/view/wchar_t/1.cc:
	Likewise.
	* testsuite/27_io/basic_stringbuf/view/char/1.cc: Likewise.
	* testsuite/27_io/basic_stringbuf/view/wchar_t/1.cc: Likewise.
	* testsuite/27_io/basic_stringstream/view/char/1.cc: Likewise.
	* testsuite/27_io/basic_stringstream/view/wchar_t/1.cc:
	Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-07  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for mkdir,
	chmod, chdir, and getcwd.
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* src/c++17/fs_ops.cc (create_dir): Use USE_MKDIR macro.
	(fs::current_path): Use USE_GETCWD and USE_CHDIR macros.
	(fs::permissions): Use USE_CHMOD macro.
	* src/filesystem/ops-common.h [FILESYSTEM_IS_WINDOWS]
	(chmod, mkdir, getcwd, chdir): Define new macros.
	[FILESYSTEM_IS_WINDOWS] (chmod, mkdir, getcwd, chdir): Use
	new macros.
	* src/filesystem/ops.cc (create_dir): Use USE_MKDIR macro.
	(fs::current_path): Use USE_GETCWD and USE_CHDIR macros.
	(fs::permissions): Use USE_CHMOD macro.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-08-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/new_allocator.h (__new_allocator): Define copy
	assignment operator as defaulted.
	* include/std/complex (complex<float>, complex<double>)
	(complex<long double>): Define copy constructor as defaulted.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/112473
	* include/bits/utility.h (integer_sequence): Add static_assert.
	* testsuite/20_util/integer_sequence/112473.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/111172
	* include/std/variant (get<T>): Remove !is_void static
	assertions.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-10-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/112089
	* include/std/shared_mutex (shared_lock::unlock): Change errc
	constant to operation_not_permitted.
	* testsuite/30_threads/shared_lock/locking/112089.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-02-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/113960
	* include/bits/stl_algobase.h (__is_byte_iter): Replace with ...
	(__memcmp_ordered_with): New concept.
	(lexicographical_compare_three_way): Use __memcmp_ordered_with
	instead of __is_byte_iter. Use correct length for memcmp.
	* testsuite/25_algorithms/lexicographical_compare_three_way/113960.cc:
	New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108846
	* include/bits/stl_algobase.h (__copy_move<false, false, RA>)
	Add __assign_one static member function.
	(__copy_move<true, false, RA>): Likewise.
	(__copy_move<IsMove, true, RA>): Do not use memmove for a single
	value.
	(__copy_move_backward<IsMove, true, RA>): Likewise.
	* testsuite/25_algorithms/copy/108846.cc: New test.
	* testsuite/25_algorithms/copy_backward/108846.cc: New test.
	* testsuite/25_algorithms/copy_n/108846.cc: New test.
	* testsuite/25_algorithms/move/108846.cc: New test.
	* testsuite/25_algorithms/move_backward/108846.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stream_iterator.h (istream_iterator): Add
	constexpr to copy constructor, as per LWG 3600.
	* testsuite/24_iterators/istream_iterator/cons/constexpr.cc:
	Check copy construction.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h (match_results): Add allocator-extended
	copy and move constructors, as per LWG 2195.
	* testsuite/28_regex/match_results/ctors/char/alloc.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-28  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/codecvt.cc: Add [[likely]] and [[unlikely]]
	attributes.

2024-03-18  Dimitrij Mijoski  <dmjpp@hotmail.com>

	Backported from master:
	2023-01-13  Dimitrij Mijoski  <dmjpp@hotmail.com>

	PR libstdc++/86419
	* src/c++11/codecvt.cc (read_utf8_code_point): Correctly detect
	errors in incomplete multibyte sequences.
	(utf16_in): Remove surrogates parameter. Fix conditions for
	returning partial.
	(utf16_out): Fix condition for returning partial.
	(ucs2_in): Do not pass surrogates argument to utf16_in.
	* testsuite/22_locale/codecvt/codecvt_unicode.cc: New test.
	* testsuite/22_locale/codecvt/codecvt_unicode.h: New header for
	tests.
	* testsuite/22_locale/codecvt/codecvt_unicode_wchar_t.cc: New
	test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-07-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/algorithmfwd.h (random_shuffle): Add deprecated
	attribute.
	* include/bits/stl_algo.h (random_shuffle): Correct comments.
	* testsuite/25_algorithms/random_shuffle/1.cc: Disable
	deprecated warnings.
	* testsuite/25_algorithms/random_shuffle/59603.cc: Likewise.
	* testsuite/25_algorithms/random_shuffle/moveable.cc: Likewise.
	* testsuite/25_algorithms/random_shuffle/deprecated.cc: New
	test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-05-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109758
	* include/bits/std_abs.h (abs(__float128)): Handle negative NaN
	and negative zero correctly.
	* testsuite/26_numerics/headers/cmath/109758.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-05-12  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_CHECK_C99_TR1): Use a non-null pointer
	to check for nan, nanf, and nanl.
	* configure: Regenerate.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-05-31  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/scoped_allocator (scoped_allocator_adaptor): Add
	noexcept to all constructors except the default constructor.
	(scoped_allocator_adaptor::inner_allocator): Add noexcept.
	(scoped_allocator_adaptor::outer_allocator): Likewise.
	* testsuite/20_util/scoped_allocator/noexcept.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-06-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/pstl/numeric_ops/transform_reduce.cc:
	Add const to equality operator.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-06-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/deque/modifiers/emplace/52799.cc:
	Removed.
	* testsuite/23_containers/deque/modifiers/emplace/const_iterator.cc:
	Removed.
	* testsuite/23_containers/list/modifiers/emplace/52799.cc:
	Removed.
	* testsuite/23_containers/list/modifiers/emplace/const_iterator.cc:
	Removed.
	* testsuite/23_containers/vector/modifiers/emplace/52799.cc:
	Removed.
	* testsuite/23_containers/vector/modifiers/emplace/const_iterator.cc:
	Removed.
	* testsuite/23_containers/deque/modifiers/emplace/1.cc: New
	test.
	* testsuite/23_containers/list/modifiers/emplace/1.cc: New
	test.
	* testsuite/23_containers/vector/modifiers/emplace/1.cc: New
	test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-07-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/alloc_traits.h (_Destroy): Qualify call.
	* include/bits/stl_construct.h (_Destroy, _Destroy_n): Likewise.
	* testsuite/23_containers/vector/cons/destroy-adl.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-07-19  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/110593
	* include/bits/chrono.h (duration): Improve static assert
	messages.
	(__is_ratio): Move to ...
	* include/std/ratio (__is_ratio): ... here.
	(__is_ratio_v): New variable template and partial
	specialization.
	(__are_both_ratios): New function template.
	(__ratio_multiply, ratio_equal, ratio_less, __ratio_add):
	Add static assertion.
	* testsuite/20_util/ratio/requirements/type_constraints.cc:
	New test.
	* testsuite/20_util/duration/requirements/typedefs_neg1.cc:
	Adjust expected error.
	* testsuite/20_util/duration/requirements/typedefs_neg2.cc:
	Likewise.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-11  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/debug.cc (acquire_sequence_ptr_for_lock): New
	function.
	(reset_sequence_ptr): New function.
	(_Safe_iterator_base::_M_detach)
	(_Safe_local_iterator_base::_M_detach): Replace bare atomic_load
	with acquire_sequence_ptr_for_lock.
	(_Safe_iterator_base::_M_reset): Replace bare atomic_store with
	reset_sequence_ptr.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-08-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.tcc (resize_and_overwrite): Invoke
	the callable with the same size as resize_and_overwrite was
	called with.
	* testsuite/21_strings/basic_string/capacity/char/resize_and_overwrite.cc:
	Check with small values for the new size.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.tcc (basic_string::resize_and_overwrite):
	Pass rvalues to the callback, as now allowed by LWG 3645.
	Enforce preconditions on the return value.
	* testsuite/21_strings/basic_string/capacity/char/resize_and_overwrite.cc:
	Adjust.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-08-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_atomic.h (atomic): Change class-head
	to struct.
	* include/bits/stl_tree.h (_Rb_tree_merge_helper): Change
	class-head to struct in friend declaration.
	* include/std/future (_Task_state_base, _Task_state): Likewise.
	* include/std/scoped_allocator (__inner_type_impl): Likewise.
	* include/std/valarray (_BinClos, _SClos, _GClos, _IClos)
	(_ValFunClos, _RefFunClos): Change class-head to struct.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-08  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/test.xml: Update reference to -std=gnu++14 as
	the default.
	* doc/html/manual/test.html: Regenerate.

2024-03-18  Alexey Lapshin  <alexey.lapshin@espressif.com>

	Backported from master:
	2023-09-08  Alexey Lapshin  <alexey.lapshin@espressif.com>

	* src/libbacktrace/Makefile.am: Remove -Werror.
	* src/libbacktrace/Makefile.in: Regenerate.

2024-03-18  Nathaniel Shead  <nathanieloshead@gmail.com>

	Backported from master:
	2023-09-29  Nathaniel Shead  <nathanieloshead@gmail.com>

	* include/bits/basic_string.h: (basic_string(basic_string&&)):
	Activate _M_local_buf when needed.
	(basic_string(basic_string&&, const _Alloc&)): Likewise.
	* include/bits/basic_string.tcc: (basic_string::swap): Likewise.
	* include/std/variant: (__detail::__variant::__construct_n): New.
	(__detail::__variant::__emplace): Use __construct_n.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-02  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_ENABLE_C99): Fix snprintf checks.
	* configure: Regenerate.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/tr2/dynamic_bitset (dynamic_bitset): Pass zero and one
	characters to _M_copy_from_string.
	* testsuite/tr2/dynamic_bitset/string.cc: New test.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/charconv (__from_chars_pow2_base): Convert base to
	unsigned for call to __countr_zero.
	(__from_chars_alnum): Likewise for call to __bit_width.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-23  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_allocator.h (uneq_allocator): Fix
	equality operator for heterogeneous comparisons.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-03-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/66146
	* doc/xml/manual/status_cxx2011.xml: Remove mention of Linux in
	note about std::call_once.
	* doc/xml/manual/status_cxx2014.xml: Likewise.
	* doc/xml/manual/status_cxx2017.xml: Likewise.
	* doc/html/manual/status.html: Regenerate.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-03-13  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/libstdc++-prettyprinters/cxx11.cc: Move custom_cat
	to namespace scope.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-02-28  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/appendix_contributing.xml: Change URLs to use
	https.
	* doc/html/manual/*: Regenerate.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-02-28  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/appendix_contributing.xml: Replace outdated
	info on ChangeLog entries.
	* doc/html/manual/appendix_contributing.html: Regenerate.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107500
	* libsupc++/eh_globals.cc (eh_globals): Remove immortalizing
	wrapper.
	(__cxxabiv1::__cxa_get_globals_fast): Adjust.
	(__cxxabiv1::__cxa_get_globals): Adjust.

2024-03-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-03-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/114147
	* include/std/tuple (tuple::tuple(allocator_arg_t, const Alloc&)):
	Add missing overload of allocator-extended default constructor.
	(tuple<T1,T2>::tuple(allocator_arg_t, const Alloc&)): Likewise.
	* testsuite/20_util/tuple/cons/114147.cc: New test.

2024-03-13  Cassio Neri  <cassio.neri@gmail.com>

	Backported from master:
	2024-01-05  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono: Fix + and - for months and weekdays.
	* testsuite/std/time/month/1.cc: Add constexpr tests against overflow.
	* testsuite/std/time/month/2.cc: New test for extreme values.
	* testsuite/std/time/weekday/1.cc: Add constexpr tests against overflow.
	* testsuite/std/time/weekday/2.cc: New test for extreme values.

2024-03-13  Cassio Neri  <cassio.neri@gmail.com>

	Backported from master:
	2023-11-14  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (operator-(const weekday&, const weekday&)):
	Optimize.

2024-03-13  Cassio Neri  <cassio.neri@gmail.com>

	Backported from master:
	2023-11-14  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (year::is_leap): Clear code.

2024-03-13  Cassio Neri  <cassio.neri@gmail.com>

	Backported from master:
	2023-11-14  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (year_month_day_last::day): Remove &1.

2024-03-13  Cassio Neri  <cassio.neri@gmail.com>

	Backported from master:
	2023-11-14  Cassio Neri  <cassio.neri@gmail.com>

	* include/std/chrono (weekday::_S_from_days): Fix UB.
	* testsuite/std/time/weekday/1.cc: Add test for overflow.

2024-03-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-08-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/list.tcc (list::sort(Cmp)): Fix -Wsign-compare
	warning for loop condition.

2024-03-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-06-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/110167
	* include/std/array (to_array): Initialize arrays of trivial
	types using memcpy. For non-trivial types, use lambda
	expressions instead of a separate helper function.
	(__to_array): Remove.
	* testsuite/23_containers/array/creation/110167.cc: New test.

2024-02-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/string_view (basic_string_view(R&&)): Remove
	constraint that traits_type must be the same, as per LWG 3857.
	* testsuite/21_strings/basic_string_view/cons/char/range_c++20.cc:
	Explicit conversion between different specializations should be
	allowed.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/range_c++20.cc:
	Likewise.

2024-02-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-02-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/90276
	* testsuite/util/pstl/test_utils.h (reverse_invoker): Do not use
	perfect forwarding for iterator arguments.

2024-02-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/syncstream (basic_osyncstream::operator=): Remove
	noexcept, as per LWG 3867.

2024-02-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-01-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107466
	* include/bits/random.tcc (subtract_with_carry_engine::seed):
	Implement proposed resolution of LWG 4014.
	* testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error
	line number.
	* testsuite/26_numerics/random/subtract_with_carry_engine/cons/lwg3809.cc:
	Check for expected result of 64-bit engine with seed that
	doesn't fit in 32-bits.

2024-02-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-01-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/113258
	* libsupc++/new_opa.cc: Prefer to use posix_memalign if
	available.

2024-02-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108636
	* include/bits/shared_ptr_base.h (__shared_ptr::operator bool):
	Add always_inline attribute for C++20 and later.

2024-01-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2024-01-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/113200
	* include/bits/char_traits.h (__gnu_cxx::char_traits::move): Use
	__builtin_constant_p to check for unrelated pointers that cannot
	be compared during constant evaluation.
	* testsuite/21_strings/char_traits/requirements/113200.cc: New
	test.

2024-01-11  Ken Matsui  <kmatsui@gcc.gnu.org>

	Backported from master:
	2024-01-11  Ken Matsui  <kmatsui@gcc.gnu.org>

	PR libstdc++/113250
	* src/c++17/fs_ops.cc (fs::equivalent): Use || instead of &&.
	* src/filesystem/ops.cc (fs::equivalent): Likewise.
	* testsuite/27_io/filesystem/operations/equivalent.cc: Handle
	error codes.
	* testsuite/experimental/filesystem/operations/equivalent.cc:
	Likewise.

2024-01-03  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2024-01-03  Patrick Palka  <ppalka@redhat.com>

	PR testsuite/113175
	* testsuite/std/ranges/iota/max_size_type.cc (test02): Reduce
	'limit' to 100 from 1000 and adjust 'log2_limit' accordingly.
	(test03): Likewise.

2023-12-16  Jakub Jelinek  <jakub@redhat.com>

	Backported from master:
	2023-10-13  Jakub Jelinek  <jakub@redhat.com>

	* testsuite/tr1/8_c_compatibility/cstdio/functions.cc (test01):
	Initialize stream to va_arg(ap, FILE*) rather than 0.
	* testsuite/tr1/8_c_compatibility/cwchar/functions.cc (test01):
	Likewise.

2023-12-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/112314
	* include/std/string_view (string_view::remove_suffix): Add
	debug assertion.
	* testsuite/21_strings/basic_string_view/modifiers/remove_prefix/debug.cc:
	New test.
	* testsuite/21_strings/basic_string_view/modifiers/remove_suffix/debug.cc:
	New test.

2023-12-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/utility (in_range): Rename _Up parameter to _Res.

2023-11-15  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-15  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/112491
	* python/libstdcxx/v6/xmethods.py (DequeWorkerBase.index):
	Correctly handle unused capacity at the start of the first node.
	* testsuite/libstdc++-xmethods/deque.cc: Check index operator
	when elements have been removed from the front.

2023-11-15  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (basic_stacktrace::at): Fix class name
	in exception message.
	* testsuite/19_diagnostics/stacktrace/hash.cc: Do not fail if
	current() returns a non-empty stacktrace.

2023-11-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/112348
	* include/std/stacktrace (hash<basic_stacktrace<Alloc>>): Fix
	type of hash function for entries.
	* testsuite/19_diagnostics/stacktrace/hash.cc: New test.

2023-11-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-11-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/112491
	* python/libstdcxx/v6/xmethods.py (DequeWorkerBase.size): Fix
	calculation to use _M_start._M_cur.
	* testsuite/libstdc++-xmethods/deque.cc: Check failing cases.

2023-11-13  Tom Tromey  <tromey@adacore.com>

	Backported from master:
	2023-10-04  Tom Tromey  <tromey@adacore.com>

	* python/libstdcxx/v6/printers.py
	(StdExpAnyPrinter.__init__): Qualify call to
	_string_types.

2023-11-13  Tom Tromey  <tromey@adacore.com>

	Backported from master:
	2023-10-04  Tom Tromey  <tromey@adacore.com>

	* python/libstdcxx/v6/printers.py: Assume that
	_versioned_namespace is non-None.
	* python/libstdcxx/v6/xmethods.py (is_specialization_of):
	Assume that _versioned_namespace is non-None.

2023-11-13  Tom Tromey  <tromey@adacore.com>

	Backported from master:
	2023-09-28  Tom Tromey  <tromey@adacore.com>

	* python/libstdcxx/v6/printers.py (Printer.add_version)
	(add_one_template_type_printer)
	(FilteringTypePrinter.add_one_type_printer): Use Python
	"not in" operator.

2023-11-13  Tom Tromey  <tromey@adacore.com>

	Backported from master:
	2023-10-04  Tom Tromey  <tromey@adacore.com>

	* python/libstdcxx/v6/xmethods.py (_versioned_namespace):
	Define.

2023-11-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-28  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/xmethods.py (is_specialization_of): Define
	new function.
	(ArrayMethodsMatcher, DequeMethodsMatcher)
	(ForwardListMethodsMatcher, ListMethodsMatcher)
	(VectorMethodsMatcher, AssociativeContainerMethodsMatcher)
	(UniquePtrGetWorker, UniquePtrMethodsMatcher)
	(SharedPtrSubscriptWorker, SharedPtrMethodsMatcher): Use
	is_specialization_of instead of re.match.

2023-11-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-28  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py: Break long lines. Use raw
	strings for regular expressions. Add whitespace around
	operators.
	(is_member_of_namespace): Use isinstance to check type.
	(is_specialization_of): Likewise. Adjust template_name
	for versioned namespace instead of duplicating the re.match
	call.
	(StdExpAnyPrinter._string_types): New static method.
	(StdExpAnyPrinter.to_string): Use _string_types.

2023-11-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-28  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py: Format docstrings according
	to PEP 257.
	* python/libstdcxx/v6/xmethods.py: Likewise.

2023-11-13  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-12  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py: Reformat.
	* python/libstdcxx/v6/xmethods.py: Likewise.

2023-11-06  Ian Lance Taylor  <iant@golang.org>

	PR libbacktrace/111315
	PR libbacktrace/112263
	* acinclude.m4: Set -D_GNU_SOURCE in BACKTRACE_CPPFLAGS and when
	grepping link.h for dl_iterate_phdr.
	* configure: Regenerate.

2023-10-25  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-10-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/111936
	* src/libbacktrace/Makefile.am: Add -prefer-pic to libtool
	compile commands.
	* src/libbacktrace/Makefile.in: Regenerate.

2023-10-23  François Dumont  <fdumont@gcc.gnu.org>

	* include/bits/hashtable_policy.h
	(_Hash_code_base::_M_hash_code(const _Hash&, const _Hash_node_value<>&)): Remove.
	(_Hash_code_base::_M_hash_code<_H2>(const _H2&, const _Hash_node_value<>&)): Remove.
	* include/bits/hashtable.h
	(_M_src_hash_code<_H2>(const _H2&, const key_type&, const __node_value_type&)): New.
	(_M_merge_unique<>, _M_merge_multi<>): Use latter.
	* testsuite/23_containers/unordered_map/modifiers/merge.cc
	(test04, test05, test06): New test cases.

2023-10-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_dir.h (directory_iterator::operator==):
	Define without using a non-exported shared_ptr symbol.
	(recursive_directory_iterator::operator==): Likewise.

2023-10-03  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/path/108636.cc: Add dg-require for
	filesystem support.

2023-10-03  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-06-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108178
	* src/filesystem/ops-common.h (do_copy_file): Check for empty
	files by trying to read a character.
	* testsuite/27_io/filesystem/operations/copy_file_108178.cc:
	New test.

2023-10-03  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-06-06  Jonathan Wakely  <jwakely@redhat.com>

	* src/filesystem/ops-common.h (do_copy_file) [O_CLOEXEC]: Set
	close-on-exec flag on file descriptors.

2023-10-03  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-20  Jonathan Wakely  <jwakely@redhat.com>

	* src/filesystem/ops-common.h (get_temp_directory_from_env): Fix
	formatting.

2023-10-03  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* src/filesystem/ops-common.h [AVR] (__unsupported): Always use
	errc::function_not_supported instead of errc::not_supported.

2023-10-02  Tim Song  <t.canens.cpp@gmail.com>

	Backported from master:
	2023-09-28  Tim Song  <t.canens.cpp@gmail.com>

	PR libstdc++/111050
	* include/bits/hashtable_policy.h
	(_Hash_node_value_base<>::_M_valptr(), _Hash_node_value_base<>::_M_v())
	Add [[__gnu__::__always_inline__]].

2023-09-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-08-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/bits/fs_path.h (path::string): Use
	_GLIBCXX17_CONSTEXPR not _GLIBCXX_CONSTEXPR for 'if constexpr'.
	* include/std/charconv (__to_chars_8): Initialize variable for
	C++17 constexpr rules.

2023-09-26  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/111511
	PR c++/111512
	* include/std/array (to_array): Qualify calls to __to_array.
	* testsuite/23_containers/array/creation/111512.cc: New test.

2023-09-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-18  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/configure.xml: Use conventional option name.
	* doc/xml/manual/status_cxx2020.xml: Update.
	* doc/html/*: Regenerate.

2023-09-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-09-14  Jonathan Wakely  <jwakely@redhat.com>

	PR c++/111357
	* include/bits/utility.h (make_integer_sequence): Add cast.
	* testsuite/20_util/integer_sequence/pr111357.cc: New test.

2023-07-12  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-07-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95048
	* testsuite/27_io/filesystem/path/construct/95048.cc: Check
	conversions to wide strings.
	* testsuite/experimental/filesystem/path/construct/95048.cc:
	Likewise.

2023-07-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-07-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104299
	* doc/xml/manual/configure.xml: Describe stdio_pure argument to
	--enable-cstdio.
	* doc/html/manual/configure.html: Regenerate.

2023-06-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-06-01  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/evolution.xml: Document removal of implicit
	allocator rebinding extensions in strict mode and for C++20.
	* doc/html/*: Regenerate.

2023-06-21  Jason Merrill  <jason@redhat.com>

	PR tree-optimization/105651
	* include/bits/basic_string.tcc (_M_replace): Add an assert
	to avoid -Wrestrict false positive.

2023-05-30  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2023-05-30  Alexandre Oliva  <oliva@adacore.com>

	* testsuite/20_util/from_chars/4.cc: Skip long double test06
	on x86_64-vxworks.
	* testsuite/20_util/to_chars/long_double.cc: Xfail run on
	x86_64-vxworks.

2023-05-30  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2023-05-25  Alexandre Oliva  <oliva@adacore.com>

	* testsuite/20_util/to_chars/long_double.cc: Expect execution
	fail on x86-vxworks.

2023-05-30  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2023-05-05  Alexandre Oliva  <oliva@adacore.com>

	* testsuite/20_util/from_chars/4.cc: Skip long double test06
	on aarch64-vxworks.
	* testsuite/20_util/to_chars/long_double.cc: Xfail run on
	aarch64-vxworks.

2023-05-30  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-30  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/109822
	* include/experimental/bits/simd.h (to_native): Use int NTTP
	as specified in PTS2.
	(to_compatible): Likewise. Add missing tag to call mask
	generator ctor.
	* testsuite/experimental/simd/pr109822_cast_functions.cc: New
	test.

2023-05-30  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-30  Matthias Kretz  <m.kretz@gsi.de>

	* testsuite/experimental/simd/tests/integer_operators.cc:
	Compute expected value differently to avoid getting turned into
	a vector shift.

2023-05-30  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-30  Matthias Kretz  <m.kretz@gsi.de>

	* testsuite/experimental/simd/tests/operator_cvt.cc: Make long
	double <-> (u)long conversion tests conditional on sizeof(long
	double) and sizeof(long).

2023-05-30  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-26  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_ppc.h (_S_bit_shift_left):
	Negative __y is UB, so prefer signed compare.

2023-05-24  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-24  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/109949
	* include/experimental/bits/simd.h (__intrinsic_type): If
	__ALTIVEC__ is defined, map gnu::vector_size types to their
	corresponding __vector T types without losing unsignedness of
	integer types. Also prefer long long over long.
	* include/experimental/bits/simd_ppc.h (_S_popcount): Cast mask
	object to the expected unsigned vector type.

2023-05-24  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-24  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/109261
	* include/experimental/bits/simd.h (__intrinsic_type):
	Specialize __intrinsic_type<double, 8> and
	__intrinsic_type<double, 16> in any case, but provide the member
	type only with __aarch64__.

2023-05-24  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-24  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/109261
	* include/experimental/bits/simd_neon.h (_S_reduce): Add
	constexpr and make NEON implementation conditional on
	not __builtin_is_constant_evaluated.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/109261
	* include/experimental/bits/simd.h (_SimdWrapper::_M_set):
	Avoid vector builtin subscripting in constant expressions.
	(resizing_simd_cast): Avoid memcpy if constant_evaluated.
	(const_where_expression, where_expression, where)
	(__extract_part, simd_mask, _SimdIntOperators, simd): Add either
	_GLIBCXX_SIMD_CONSTEXPR (on public APIs), or constexpr (on
	internal APIs).
	* include/experimental/bits/simd_builtin.h (__vector_permute)
	(__vector_shuffle, __extract_part, _GnuTraits::_SimdCastType1)
	(_GnuTraits::_SimdCastType2, _SimdImplBuiltin)
	(_MaskImplBuiltin::_S_store): Add constexpr.
	(_CommonImplBuiltin::_S_store_bool_array)
	(_SimdImplBuiltin::_S_load, _SimdImplBuiltin::_S_store)
	(_SimdImplBuiltin::_S_reduce, _MaskImplBuiltin::_S_load): Add
	constant_evaluated case.
	* include/experimental/bits/simd_fixed_size.h
	(_S_masked_load): Reword comment.
	(__tuple_element_meta, __make_meta, _SimdTuple::_M_apply_r)
	(_SimdTuple::_M_subscript_read, _SimdTuple::_M_subscript_write)
	(__make_simd_tuple, __optimize_simd_tuple, __extract_part)
	(__autocvt_to_simd, _Fixed::__traits::_SimdBase)
	(_Fixed::__traits::_SimdCastType, _SimdImplFixedSize): Add
	constexpr.
	(_SimdTuple::operator[], _M_set): Add constexpr and add
	constant_evaluated case.
	(_MaskImplFixedSize::_S_load): Add constant_evaluated case.
	* include/experimental/bits/simd_scalar.h: Add constexpr.
	* include/experimental/bits/simd_x86.h (_CommonImplX86): Add
	constexpr and add constant_evaluated case.
	(_SimdImplX86::_S_equal_to, _S_not_equal_to, _S_less)
	(_S_less_equal): Value-initialize to satisfy constexpr
	evaluation.
	(_MaskImplX86::_S_load): Add constant_evaluated case.
	(_MaskImplX86::_S_store): Add constexpr and constant_evaluated
	case. Value-initialize local variables.
	(_MaskImplX86::_S_logical_and, _S_logical_or, _S_bit_not)
	(_S_bit_and, _S_bit_or, _S_bit_xor): Add constant_evaluated
	case.
	* testsuite/experimental/simd/pr109261_constexpr_simd.cc: New
	test.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-05-22  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_builtin.h (_S_fpclassify): Move
	__infn into #ifdef'ed block.
	* testsuite/experimental/simd/tests/fpclassify.cc: Declare
	constants only when used.
	* testsuite/experimental/simd/tests/frexp.cc: Likewise.
	* testsuite/experimental/simd/tests/logarithm.cc: Likewise.
	* testsuite/experimental/simd/tests/trunc_ceil_floor.cc:
	Likewise.
	* testsuite/experimental/simd/tests/ldexp_scalbn_scalbln_modf.cc:
	Move totest and expect1 into #ifdef'ed block.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-03-28  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd.h (is_simd_flag_type): New.
	(_IsSimdFlagType): New.
	(copy_from, copy_to, load ctors): Constrain _Flags using
	_IsSimdFlagType.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-03-28  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_x86.h (_SimdImplX86): Use
	_Base::_S_divides if the optimized _S_divides function is hidden
	via the preprocessor.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_detail.h: Don't declare the
	simd API as constexpr with Clang.
	* include/experimental/bits/simd_x86.h (__movm): New.
	(_S_blend_avx512): Resolve FIXME. Implement blend using __movm
	and ?:.
	(_SimdImplX86::_S_masked_unary): Clang does not implement the
	same builtins. Implement the function using __movm, ?:, and -
	operators on vector_size types instead.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-24  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd.h: Line breaks and indenting
	fixed to follow the libstdc++ standard.
	* include/experimental/bits/simd_builtin.h: Likewise.
	* include/experimental/bits/simd_fixed_size.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.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-24  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/108030
	* include/experimental/bits/simd_fixed_size.h
	(_SimdImplFixedSize::_S_broadcast): Replace inline with
	_GLIBCXX_SIMD_INTRINSIC.
	(_SimdImplFixedSize::_S_generate): Likewise.
	(_SimdImplFixedSize::_S_load): Likewise.
	(_SimdImplFixedSize::_S_masked_load): Likewise.
	(_SimdImplFixedSize::_S_store): Likewise.
	(_SimdImplFixedSize::_S_masked_store): Likewise.
	(_SimdImplFixedSize::_S_min): Likewise.
	(_SimdImplFixedSize::_S_max): Likewise.
	(_SimdImplFixedSize::_S_complement): Likewise.
	(_SimdImplFixedSize::_S_unary_minus): Likewise.
	(_SimdImplFixedSize::_S_plus): Likewise.
	(_SimdImplFixedSize::_S_minus): Likewise.
	(_SimdImplFixedSize::_S_multiplies): Likewise.
	(_SimdImplFixedSize::_S_divides): Likewise.
	(_SimdImplFixedSize::_S_modulus): Likewise.
	(_SimdImplFixedSize::_S_bit_and): Likewise.
	(_SimdImplFixedSize::_S_bit_or): Likewise.
	(_SimdImplFixedSize::_S_bit_xor): Likewise.
	(_SimdImplFixedSize::_S_bit_shift_left): Likewise.
	(_SimdImplFixedSize::_S_bit_shift_right): Likewise.
	(_SimdImplFixedSize::_S_remquo): Add inline keyword (to be
	explicit about not always-inline, yet).
	(_SimdImplFixedSize::_S_isinf): Likewise.
	(_SimdImplFixedSize::_S_isfinite): Likewise.
	(_SimdImplFixedSize::_S_isnan): Likewise.
	(_SimdImplFixedSize::_S_isnormal): Likewise.
	(_SimdImplFixedSize::_S_signbit): Likewise.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-24  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/108856
	* include/experimental/bits/simd_builtin.h
	(_SimdImplBuiltin::_S_masked_unary): More efficient
	implementation of masked inc-/decrement for integers and floats
	without AVX2.
	* include/experimental/bits/simd_x86.h
	(_SimdImplX86::_S_masked_unary): New. Use AVX512 masked subtract
	builtins for masked inc-/decrement.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	* testsuite/experimental/simd/tests/reductions.cc: Introduce
	max_distance as the type-dependent max error.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/108030
	* include/experimental/bits/simd_detail.h
	(_GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA): Define as empty for
	__clang__.

2023-05-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/108030
	* include/experimental/bits/simd_detail.h: Define
	_GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA.
	* include/experimental/bits/simd.h: Annotate lambdas with
	_GLIBCXX_SIMD_ALWAYS_INLINE_LAMBDA.
	* include/experimental/bits/simd_builtin.h: Ditto.
	* include/experimental/bits/simd_converter.h: Ditto.
	* include/experimental/bits/simd_fixed_size.h: Ditto.
	* include/experimental/bits/simd_math.h: Ditto.
	* include/experimental/bits/simd_neon.h: Ditto.
	* include/experimental/bits/simd_x86.h: Ditto.

2023-05-16  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107801
	* src/c++17/memory_resource.cc (chunk::_M_bytes): Change type
	from uint32_t to bitset::size_type. Adjust static assertion.
	(__pool_resource::_Pool::replenish): Cast to size_t after
	multiplication instead of before.
	(__pool_resource::_M_alloc_pools): Ensure both arguments to
	std::max have type size_t.

2023-05-11  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-16  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdExpAnyPrinter): Make
	expansion of std::string in manager name more robust.

2023-05-08  Release Manager

	* GCC 12.3.0 released.

2023-05-03  Kefu Chai  <kefu.chai@scylladb.com>

	Backported from master:
	2023-05-03  Kefu Chai  <kefu.chai@scylladb.com>
		    Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109703
	* include/bits/basic_string.h (basic_string(Iter, Iter, Alloc)):
	Initialize _M_string_length.

2023-05-03  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-04-28  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (STRIP_FROM_PATH): Remove prefixes
	from header paths.

2023-04-29  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2023-04-12  Patrick Palka  <ppalka@redhat.com>

	* include/std/ranges (lazy_split_view::_OuterIter::_OuterIter):
	Propagate _M_trailing_empty in the const-converting constructor
	as per LWG 3904.
	* testsuite/std/ranges/adaptors/lazy_split.cc (test12): New test.

2023-04-29  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2023-03-14  Patrick Palka  <ppalka@redhat.com>

	* include/bits/stl_iterator.h (move_iterator::_S_iter_concept):
	Define.
	(__cpp_lib_move_iterator_concept): Define for C++20.
	(move_iterator::iterator_concept): Strengthen as per P2520R0.
	* include/std/version (__cpp_lib_move_iterator_concept): Define
	for C++20.
	* testsuite/24_iterators/move_iterator/p2520r0.cc: New test.

2023-04-29  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2023-03-09  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/108362
	* include/std/ranges (__detail::__can_single_view): New concept.
	(_Single::operator()): Constrain it.  Move [[nodiscard]] to the
	end of the function declarator.
	(__detail::__can_iota_view): New concept.
	(_Iota::operator()): Constrain it.  Move [[nodiscard]] to the
	end of the function declarator.
	(__detail::__can_istream_view): New concept.
	(_Istream::operator()): Constrain it.  Move [[nodiscard]] to the
	end of the function declarator.
	* testsuite/std/ranges/iota/lwg3292_neg.cc: Prune "in
	requirements" diagnostic.
	* testsuite/std/ranges/iota/iota_view.cc (test07): New test.
	* testsuite/std/ranges/istream_view.cc (test08): New test.
	* testsuite/std/ranges/single_view.cc (test07): New test.

2023-04-28  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2023-04-24  Patrick Palka  <ppalka@redhat.com>

	* include/bits/max_size_type.h (__max_diff_type::operator>>=):
	Fix propagation of sign bit.
	* testsuite/std/ranges/iota/max_size_type.cc: Avoid using the
	non-standard 'signed typedef-name'.  Add some compile-time tests
	for right-shifting a negative __max_diff_type value by more than
	one.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/atomic: Add missing @endcond doxygen comment.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-25  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107850
	* include/bits/erase_if.h (__erase_nodes_if): Use non-const
	reference to the container.
	* include/experimental/map (erase_if): Likewise.
	* include/experimental/set (erase_if): Likewise.
	* include/experimental/unordered_map (erase_if): Likewise.
	* include/experimental/unordered_set (erase_if): Likewise.
	* include/std/map (erase_if): Likewise.
	* include/std/set (erase_if): Likewise.
	* include/std/unordered_map (erase_if): Likewise.
	* include/std/unordered_set (erase_if): Likewise.
	* testsuite/23_containers/map/erasure.cc: Check with
	const-incorrect predicate.
	* testsuite/23_containers/set/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_map/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_set/erasure.cc: Likewise.
	* testsuite/experimental/map/erasure.cc: Likewise.
	* testsuite/experimental/set/erasure.cc: Likewise.
	* testsuite/experimental/unordered_map/erasure.cc: Likewise.
	* testsuite/experimental/unordered_set/erasure.cc: Likewise.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-28  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/random/subtract_with_carry_engine/cons/lwg3809.cc:
	Replace non-ASCII character.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108952
	* include/bits/uses_allocator_args.h
	(uses_allocator_construction_args): Implement LWG 3527.
	* testsuite/20_util/pair/astuple/get-2.cc: New test.
	* testsuite/20_util/scoped_allocator/108952.cc: New test.
	* testsuite/20_util/uses_allocator/lwg3527.cc: New test.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-31  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109339
	* include/std/stop_token (_Stop_state_ptr(const stop_source&)):
	Add attribute access with access-mode 'none'.
	* testsuite/30_threads/stop_token/stop_source/109339.cc: New test.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107466
	* include/bits/random.h (subtract_with_carry_engine): Use 32-bit
	type for default seed. Use 0u as default argument for
	subtract_with_carry_engine(result_type) constructor and
	seed(result_type) member function.
	* include/bits/random.tcc (subtract_with_carry_engine): Use
	32-bit type for default seed and engine used for initial state.
	* testsuite/26_numerics/random/subtract_with_carry_engine/cons/lwg3809.cc:
	New test.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/mofunc_impl.h: Fix typo in doxygen comment.

2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-04-27  Jonathan Wakely  <jwakely@redhat.com>

	* doc/doxygen/user.cfg.in (SOURCE_BROWSER): Only set to YES for
	HTML docs.
	* include/bits/gslice_array.h (_DEFINE_VALARRAY_OPERATOR): Omit
	from doxygen docs.
	* include/bits/indirect_array.h (_DEFINE_VALARRAY_OPERATOR):
	Likewise.
	* include/bits/mask_array.h (_DEFINE_VALARRAY_OPERATOR):
	Likewise.
	* include/bits/slice_array.h (_DEFINE_VALARRAY_OPERATOR):
	Likewise.
	* include/std/valarray (_DEFINE_VALARRAY_UNARY_OPERATOR)
	(_DEFINE_VALARRAY_AUGMENTED_ASSIGNMENT)
	(_DEFINE_VALARRAY_EXPR_AUGMENTED_ASSIGNMENT)
	(_DEFINE_BINARY_OPERATOR): Likewise.

2023-04-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103755
	* include/bits/locale_classes.tcc (try_facet, use_facet): Do not
	check array index or dynamic type when accessing required
	specializations of std::ctype, std::num_get, or std::num_put.
	* testsuite/22_locale/ctype/is/string/89728_neg.cc: Adjust
	expected errors.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107852
	PR libstdc++/106199
	PR libstdc++/100366
	* include/bits/vector.tcc (vector::_M_fill_insert): Copy
	_M_start and _M_finish members before allocating.
	(vector::_M_default_append): Likewise.
	(vector::_M_range_insert): Likewise.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-04-04  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/extensions.xml: Remove std::bad_exception from
	example program.
	* doc/html/manual/ext_demangling.html: Regenerate.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-04-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/regex.h (sub_match::swap): New function.
	* testsuite/28_regex/sub_match/lwg3204.cc: New test.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/103387
	* include/bits/istream.tcc (istream::_M_extract(ValueT&)): Use
	std::use_facet instead of cached _M_num_get facet.
	(istream::operator>>(short&)): Likewise.
	(istream::operator>>(int&)): Likewise.
	* include/bits/ostream.tcc (ostream::_M_insert(ValueT)): Use
	std::use_facet instead of cached _M_num_put facet.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-01-15  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/30_threads/jthread/jthread.cc: Remove -pthread from
	dg-options.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-22  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_atomic.h (atomic::operator=(nullptr_t)):
	Add overload, as per LWG 3893.
	* testsuite/20_util/shared_ptr/atomic/atomic_shared_ptr.cc:
	Check assignment from nullptr.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-29  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/expected (expected::value() &): Use const lvalue
	for unex member passed to bad_expected_access constructor, as
	per LWG 3843.

2023-04-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/variant (variant::operator=): Implement resolution
	of LWG 3585.
	* testsuite/20_util/variant/lwg3585.cc: New test.

2023-04-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2023-04-12  Patrick Palka  <ppalka@redhat.com>

	* src/c++17/floating_from_chars.cc: Include <algorithm>,
	<iterator>, <limits> and <cstdint>.

2023-03-30  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109242
	* include/std/optional (transform): Use std::remove_cv_t.
	* testsuite/20_util/optional/monadic/pr109242.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-12-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108118
	* include/bits/shared_ptr_base.h (weak_ptr::operator=):
	Implement as move-and-swap exactly as specified in the standard.
	* testsuite/20_util/weak_ptr/cons/self_move.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-03  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ranges_algobase.h (__detail::__copy_or_move):
	Move output iterator.
	* testsuite/25_algorithms/copy/constrained.cc: Check copying to
	move-only output iterator.

2023-03-28  Björn Schäpers  <bjoern@hazardy.de>

	Backported from master:
	2023-01-14  Björn Schäpers  <bjoern@hazardy.de>

	* include/std/stacktrace (stacktrace_entry::_S_demangle): Use
	raw __name if __cxa_demangle could not demangle it.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-12-12  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace (operator<<): Only output to narrow
	ostreams (LWG 3515).
	* testsuite/19_diagnostics/stacktrace/synopsis.cc:

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-12-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/chrono.h (duration_cast, floor, round, abs, ceil)
	(time_point_cast): Add [[nodiscard]] attribute and doxygen
	comments.
	(treat_as_floating_point): Add doxygen commen.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-12-09  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/chrono.h (duration, time_point): Change 'struct'
	to 'class'.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-01-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108554
	* include/bits/stl_tree.h (_Rb_tree_insert_and_rebalance): Add
	nonnull attribute.
	(_Rb_tree_rebalance_for_erase): Add nonnull and returns_nonnull
	attributes.
	* testsuite/23_containers/map/modifiers/108554.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/bitset (bitset::_M_copy_to_string): Find set bits
	instead of iterating over individual bits.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_atomic.h (_GLIBCXX_TSAN_MUTEX_PRE_LOCK):
	Replace with ...
	(_GLIBCXX_TSAN_MUTEX_TRY_LOCK): ... this, add try_lock flag.
	(_GLIBCXX_TSAN_MUTEX_TRY_LOCK_FAILED): New macro using
	try_lock_failed flag
	(_GLIBCXX_TSAN_MUTEX_POST_LOCK): Rename to ...
	(_GLIBCXX_TSAN_MUTEX_LOCKED): ... this.
	(_GLIBCXX_TSAN_MUTEX_PRE_UNLOCK): Remove invalid flag.
	(_GLIBCXX_TSAN_MUTEX_POST_UNLOCK): Remove invalid flag.
	(_Sp_atomic::_Atomic_count::lock): Use new macros.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_atomic.h (_GLIBCXX_TSAN_MUTEX_DESTROY)
	(_GLIBCXX_TSAN_MUTEX_PRE_LOCK, _GLIBCXX_TSAN_MUTEX_POST_LOCK)
	(_GLIBCXX_TSAN_MUTEX_PRE_UNLOCK, _GLIBCXX_TSAN_MUTEX_POST_UNLOCK)
	(_GLIBCXX_TSAN_MUTEX_PRE_SIGNAL, _GLIBCXX_TSAN_MUTEX_POST_SIGNAL):
	Define macros for TSan annotation functions.
	(_Sp_atomic::_Atomic_count): Add annotations.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/memory_resource (new_delete_resource): Add
	nodiscard, returns_nonnull and const attributes.
	(null_memory_resource): Likewise.
	(set_default_resource, get_default_resource): Add returns_nonnull
	attribute.
	(memory_resource::is_equal): Add nodiscard attribute.
	(operator==, operator!=): Likewise.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/future
	(_State_baseV2::__setter(exception_ptr&, promise&)): Add
	assertion for LWG 2276 precondition.
	* testsuite/30_threads/promise/members/set_exception_neg.cc:
	New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/c_global/cstddef (byte): Add always_inline attribute
	to all operator overloads.
	(to_integer): Add always_inline attribute.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-08  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/system_error (__adl_only::make_error_code): Add
	deleted function.
	(__adl_only::make_error_condition): Likewise.
	(error_code::error_code(ErrorCodeEnum)): Add using-declaration
	for deleted function.
	(error_condition::error_condition(ErrorConditionEnum)):
	Likewise.
	* testsuite/19_diagnostics/error_code/cons/lwg3629.cc: New test.
	* testsuite/19_diagnostics/error_condition/cons/lwg3629.cc: New test.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-17  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ios_base.h (io_category): Add const and nodiscard
	attributes.
	(make_error_code, make_error_condition): Add nodiscard.
	* include/std/future (future_category): Add const and nodiscard.
	(make_error_code, make_error_condition): Add nodiscard.
	* include/std/system_error (generic_category system_category):
	Add nodiscard. Replace _GLIBCXX_CONST with C++11 attribute.
	(error_code::value, error_code::category, error_code::operator bool)
	(error_condition::value, error_condition::category)
	(error_condition::operator bool, make_error_code)
	(make_error_condition, operator==, operator!=, operator<=>): Add
	nodiscard.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/std_thread.h (thread, thread::id): Improve
	doxygen docs.
	* include/std/future: Likewise.
	* include/std/thread (jthread): Likewise.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/system_error: Improve doxygen comments.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/ext/throw_allocator.h: Use reserved names for
	parameters.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-25  Jonathan Wakely  <jwakely@redhat.com>

	* acinclude.m4 (GLIBCXX_CHECK_UCHAR_H): Don't use AC_MSG_RESULT
	unless the AC_MSG_CHECKING happened.
	* configure: Regenerate.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-01-12  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/abi.xml: Add latest library versions.
	* doc/html/manual/abi.html: Regenerate.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/char_traits.h (char_traits::copy): Return without
	using memcpy if n==0.
	(char_traits::assign): Likewise for memset.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109299
	* include/bits/basic_string.h (basic_string::_M_is_local()): Add
	hint for compiler that local strings fit in the local buffer.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/cow_string.h: Fix typo in comment.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/experimental/optional: Fix header name in comment.

2023-03-28  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-01-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108413
	* include/c_compatibility/stdatomic.h: Change copyright line to
	be consistent with other headers contributed under DCO terms.
	* include/std/expected: Add full stop to copyright line.

2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_x86.h
	(_SimdImplX86::_S_divides): Replace test for __GCC_IEC_559 == 0
	with __RECIPROCAL_MATH__.

2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_detail.h: Don't define
	_GLIBCXX_SIMD_WORKAROUND_PR90993 for Clang.
	* include/experimental/bits/simd_x86.h (_S_divides): Remove
	check for __clang__.

2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-03-21  Matthias Kretz  <m.kretz@gsi.de>

	* testsuite/experimental/simd/tests/operators.cc: Clang doesn't
	define __GCC_IEC_559. Use __STDC_IEC_559__ instead.

2023-03-20  François Dumont  <fdumont@gcc.gnu.org>

	Backported from master:
	2022-11-16  François Dumont  <fdumont@gcc.gnu.org>

	* python/libstdcxx/v6/printers.py (FilteringTypePrinter): Rename 'match' field
	'template'. Add self.targ1 to specify the first template parameter of the instantiation
	to match.
	(add_one_type_printer): Add targ1 optional parameter, default to None.
	Use gdb.types.get_basic_type to compare the type to recognize and the type
	returned from the typedef lookup.
	(register_type_printers): Adapt calls to add_one_type_printers.

2023-03-20  François Dumont  <fdumont@gcc.gnu.org>

	Backported from master:
	2022-10-03  François Dumont  <fdumont@gcc.gnu.org>

	* python/libstdcxx/v6/printers.py (Printer.add_version): Do not add version
	namespace for __cxx11 symbols.
	(add_one_template_type_printer): Likewise.
	(add_one_type_printer): Likewise.
	(FilteringTypePrinter._recognizer.recognize): Add a workaround for std::string & al
	ambiguous typedef matching both std:: and std::__cxx11:: symbols.
	* testsuite/libstdc++-prettyprinters/cxx17.cc: Remove obsolete
	\#define _GLIBCXX_USE_CXX11_ABI 0.
	* testsuite/libstdc++-prettyprinters/simple.cc: Likewise. Adapt test to accept
	std::__cxx11::list.
	* testsuite/libstdc++-prettyprinters/simple11.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/whatis.cc: Likewise.
	* testsuite/libstdc++-prettyprinters/80276.cc: Likewise and remove xfail for c++20
	and debug mode.
	* testsuite/libstdc++-prettyprinters/libfundts.cc: Likewise.

2023-03-20  François Dumont  <fdumont@gcc.gnu.org>

	Backported from master:
	2022-09-22  François Dumont  <fdumont@gcc.gnu.org>

	* python/libstdcxx/v6/printers.py: Remove ptinter registration for non-existing
	types std::__debug::unique_ptr, std::__debug::stack, std::__debug::queue,
	std::__debug::priority_queue.

2023-03-20  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-03-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109064
	* python/libstdcxx/v6/xmethods.py (SharedPtrUseCountWorker):
	Remove self-recursion in __init__. Add missing _supports.
	* testsuite/libstdc++-xmethods/shared_ptr.cc: Check use_count()
	and unique().

2023-03-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109182
	* include/std/expected (expected<void>::expected(in_place_t)):
	Remove template-head.

2023-03-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/109165
	* include/std/coroutine (hash<>::operator()): Add const.
	* testsuite/18_support/coroutines/hash.cc: New test.

2023-03-10  Thomas W Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2023-02-14  Thomas W Rodgers  <rodgert@twrodgers.com>

	PR libstdc++/103934
	* include/std/atomic (atomic_flag_wait): Add.
	(atomic_flag_wait_explicit): Add.
	(atomic_flag_notify): Add.
	(atomic_flag_notify_explicit): Add.
	* testsuite/29_atomics/atomic_flag/wait_notify/1.cc:
	Add test case to cover missing atomic_flag free functions.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	PR libstdc++/108030
	* include/experimental/bits/simd.h (__vector_broadcast):
	Implement via __vector_broadcast_impl instead of
	__call_with_n_evaluations + 2 lambdas.
	(__vector_broadcast_impl): New.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_builtin.h (_S_set): Compare as
	int. The actual range of these indexes is very small.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_x86.h (_S_bit_shift_left)
	(_S_bit_shift_right): Declare constexpr. The implementation was
	already expecting constexpr evaluation.

2023-02-23  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-20  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd.h (__extract_part, split):
	Use reserved name for template parameter.

2023-02-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-31  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/refwrap.h (reference_wrapper::operator()): Add
	noexcept-specifier and use __invoke_result instead of result_of.
	* testsuite/20_util/reference_wrapper/invoke-noexcept.cc: New test.

2023-02-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108636
	* include/bits/fs_path.h (path::path(string_view, _Type))
	(path::_Cmpt::_Cmpt(string_view, _Type, size_t)): Move inline
	definitions to ...
	* src/c++17/fs_path.cc: ... here.
	* testsuite/27_io/filesystem/path/108636.cc: New test.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_math.h (__hypot): Bitcasting
	between scalars requires the __bit_cast helper function instead
	of simd_bit_cast.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd_x86.h
	(_SimdImplX86::_S_not_equal_to, _SimdImplX86::_S_less)
	(_SimdImplX86::_S_less_equal): Do not call
	__builtin_is_constant_evaluated in constexpr-if.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	* testsuite/experimental/simd/tests/bits/verify.h
	(verify::verify): Use %zx for size_t in format string.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	* testsuite/experimental/simd/README.md: Document the timeout
	and timeout-factor directives. Minor typo fixed.

2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	Backported from master:
	2023-02-16  Matthias Kretz  <m.kretz@gsi.de>

	* include/experimental/bits/simd.h
	(_SimdWrapper::_M_is_constprop_none_of)
	(_SimdWrapper::_M_is_constprop_all_of): Return false unless the
	computed result still satisfies __builtin_constant_p.

2023-02-14  Thomas W Rodgers  <rodgert@twrodgers.com>

	Backported from master:
	2023-02-14  Thomas W Rodgers  <rodgert@twrodgers.com>

	PR libstdc++/103934
	* include/std/atomic (atomic_flag_test): Add.
	(atomic_flag_test_explicit): Add.
	* testsuite/29_atomics/atomic_flag/test/explicit.cc: Add
	test case to cover missing atomic_flag free functions.
	* testsuite/29_atomics/atomic_flag/test/implicit.cc:
	Likewise.

2023-02-10  Jakub Jelinek  <jakub@redhat.com>

	Backported from master:
	2022-11-24  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/107468
	* src/c++17/fast_float/fast_float.h: Partial merge from fast_float
	2ef9abbcf6a11958b6fa685a89d0150022e82e78 commit.

2023-02-10  Jakub Jelinek  <jakub@redhat.com>

	Backported from master:
	2022-11-07  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/107468
	* src/c++17/fast_float/fast_float.h: Partial merge from fast_float
	662497742fea7055f0e0ee27e5a7ddc382c2c38e commit.
	* testsuite/20_util/from_chars/pr107468.cc: New test.

2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-01  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++11/random.cc (random_device::_M_fini): Do not try to
	close the file handle if the target doesn't support the
	/dev/random and /dev/urandom files.

2023-02-02  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-02-01  Jonathan Wakely  <jwakely@redhat.com>

	* config/os/generic/error_constants.h (errc::value_too_large)
	[__AVR__]: Define.
	* src/c++11/system_error.cc
	(system_category::default_error_condition) [__AVR__]: Only match
	recognize values equal to EDOM, ERANGE, ENOSYS and EINTR.
	* src/c++17/fs_ops.cc (fs::current_path) [__AVR__]: Do not check
	for ENOENT etc. in switch.
	(fs::remove_all) [__AVR__]: Likewise.
	* src/filesystem/ops-common.h [__AVR__]: Do not use POSIX open,
	close etc.

2023-02-02  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2022-11-06  Patrick Palka  <ppalka@redhat.com>

	* include/bits/atomic_wait.h (_detail::__platform_wait_alignment):
	Declare inline.  Remove redundant static specifier.
	(__detail::__atomic_spin_count_relax): Declare inline.
	(__detail::__atomic_spin_count): Likewise.
	* include/bits/regex_automaton.h (__detail::_S_invalid_state_id):
	Declare inline for C++17.  Declare constexpr.  Remove
	redundant const and static specifiers.
	* include/bits/regex_error.h (regex_constants::error_collate):
	Declare inline for C++17 as per P0607R0.
	(regex_constants::error_ctype): Likewise.
	(regex_constants::error_escape): Likewise.
	(regex_constants::error_backref): Likewise.
	(regex_constants::error_brack): Likewise.
	(regex_constants::error_paren): Likewise.
	(regex_constants::error_brace): Likewise.
	(regex_constants::error_badbrace): Likewise.
	(regex_constants::error_range): Likewise.
	(regex_constants::error_space): Likewise.
	(regex_constants::error_badrepeat): Likewise.
	(regex_constants::error_complexity): Likewise.
	(regex_constants::error_stack): Likewise.
	* include/ext/concurrence.h (__gnu_cxx::__default_lock_policy):
	Likewise.  Remove redundant static specifier.
	* include/pstl/execution_defs.h (execution::seq): Declare inline
	for C++17 as per P0607R0.
	(execution::par): Likewise.
	(execution::par_unseq): Likewise.
	(execution::unseq): Likewise.

2023-01-18  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-12-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105730
	* src/c++11/compatibility-condvar.cc (__nothrow_wait_cv::wait):
	Access private data member of base class and call its wait
	member.

2023-01-16  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/106183
	* include/bits/atomic_wait.h (__waiter_pool_base::_M_notify):
	Move increment of _M_ver here.
	[!_GLIBCXX_HAVE_PLATFORM_WAIT]: Lock mutex around increment.
	Use relaxed memory order and always notify all waiters.
	(__waiter_base::_M_do_wait) [!_GLIBCXX_HAVE_PLATFORM_WAIT]:
	Check value again after locking mutex.
	(__waiter_base::_M_notify): Remove increment of _M_ver.

2023-01-05  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2023-01-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108265
	* include/std/chrono (hh_mm_ss): Do not use chrono::abs if
	duration rep is unsigned. Remove incorrect noexcept-specifier.
	* testsuite/std/time/hh_mm_ss/1.cc: Check unsigned rep. Check
	floating-point representations. Check default construction.

2022-12-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107814
	* testsuite/experimental/filesystem/iterators/error_reporting.cc:
	Use a static buffer with space after it.

2022-12-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-12-16  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/expected (expected::_M_swap_val_unex): Guard the
	correct object.
	(expected::swap): Move is_swappable
	requirement from static_assert to constraint.
	(swap): Likewise.
	(operator==): Remove noexcept-specifier.
	* testsuite/20_util/expected/swap.cc: Check swapping of
	types without non-throwing move constructor. Check constraints
	on swap.
	* testsuite/20_util/expected/unexpected.cc: Check constraints on
	swap.
	* testsuite/20_util/expected/equality.cc: New test.

2022-12-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-12-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/108097
	* include/std/stacktrace (basic_stracktrace::_Impl): Do not
	multiply N by sizeof(value_type) when allocating.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/memory: Do not include <bits/stl_algobase.h>.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-11  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/tuple/swap.cc (MoveOnly::operator==): Add
	const qualifier.
	* testsuite/26_numerics/valarray/87641.cc (X::operator==):
	Likewise.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-02  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/expected (expected::_M_invalid): Remove.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-21  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/chrono.h (duration): Check preconditions on
	template arguments before using them.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-10-28  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_path.h (path::filename()): Fix dangling
	reference.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-14  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/intro.xml: Document LWG 1203.
	* doc/html/*: Regenerate.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-07  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/barrier: Add missing runtime exception.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_dir.h (directory_iterator): Add comparison
	with std::default_sentinel_t. Remove redundant operator!= for
	C++20.
	* (recursive_directory_iterator): Likewise.
	* include/bits/iterator_concepts.h [!__cpp_lib_concepts]
	(default_sentinel_t, default_sentinel): Define even if concepts
	are not supported.
	* include/bits/regex.h (regex_iterator): Add comparison with
	std::default_sentinel_t. Remove redundant operator!= for C++20.
	(regex_token_iterator): Likewise.
	(regex_token_iterator::_M_end_of_seq()): Add noexcept.
	* testsuite/27_io/filesystem/iterators/lwg3719.cc: New test.
	* testsuite/28_regex/iterators/regex_iterator/lwg3719.cc:
	New test.
	* testsuite/28_regex/iterators/regex_token_iterator/lwg3719.cc:
	New test.

2022-11-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/91456
	* include/std/type_traits (__is_nothrow_invocable): Remove.
	(__is_invocable_impl::__nothrow_type): New member type which
	checks if the conversion can throw.
	(__is_nt_invocable_impl): Replace class template with alias
	template to __is_nt_invocable_impl::__nothrow_type.
	* testsuite/20_util/is_nothrow_invocable/91456.cc: New test.
	* testsuite/20_util/is_nothrow_convertible/value.cc: Remove
	macro used by value_ext.cc test.
	* testsuite/20_util/is_nothrow_convertible/value_ext.cc: Remove
	test for non-standard __is_nothrow_invocable trait.

2022-11-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/106201
	* include/bits/fs_path.h (filesystem::swap(path&, path&)):
	Replace with abbreviated function template.
	* include/experimental/bits/fs_path.h (filesystem::swap):
	Likewise.
	* testsuite/27_io/filesystem/iterators/106201.cc: New test.
	* testsuite/experimental/filesystem/iterators/106201.cc: New test.

2022-11-22  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/107801
	* src/c++17/memory_resource.cc (pool_sizes): Disable large pools
	for targets with 16-bit int.

2022-11-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/mofunc_impl.h (move_only_function::__param_t):
	Use __is_scalar instead of is_trivially_copyable.
	* testsuite/20_util/move_only_function/call.cc: Check parameters
	involving incomplete types.

2022-11-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/95048
	* include/bits/fs_path.h (path::_Codecvt): New class template
	that selects the kind of code conversion done.
	(path::_Codecvt<wchar_t>): Select based on sizeof(wchar_t).
	(_GLIBCXX_CONV_FROM_UTF8): New macro to allow the same code to
	be used for Windows and POSIX.
	(path::_S_convert(const EcharT*, const EcharT*)): Simplify by
	using _Codecvt and _GLIBCXX_CONV_FROM_UTF8 abstractions.
	(path::_S_str_convert(basic_string_view<value_type>, const A&)):
	Simplify nested conditions.
	* include/experimental/bits/fs_path.h (path::_Cvt): Define
	nested typedef controlling type of code conversion done.
	(path::_Cvt::_S_wconvert): Use new typedef.
	(path::string(const A&)): Likewise.
	* testsuite/27_io/filesystem/path/construct/95048.cc: New test.
	* testsuite/experimental/filesystem/path/construct/95048.cc: New
	test.

2022-11-14  Nathaniel Shead  <nathanieloshead@gmail.com>

	Backported from master:
	2022-11-11  Nathaniel Shead  <nathanieloshead@gmail.com>

	PR libstdc++/103295
	* include/bits/basic_string.h (_M_use_local_data): Set active
	member to _M_local_buf.

2022-11-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-11-08  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/authors.xml: Remove empty author element.
	* doc/xml/manual/spine.xml: Likewise.
	* doc/html/manual/index.html: Regenerate.

2022-10-19  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2022-06-22  Alexandre Oliva  <oliva@adacore.com>

	* libsupc++/eh_globals.cc [!_GLIBCXX_HAVE_TLS]
	(__eh_globals_init::~__eh_globals_init): Clear _S_init first.

2022-09-29  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-09-28  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/evolution.xml: Document std::bind API
	changes.
	* doc/xml/manual/intro.xml: Document LWG 2487 status.
	* doc/xml/manual/using.xml: Clarify default value of
	_GLIBCXX_USE_DEPRECATED.
	* doc/html/*: Regenerate.
	* include/std/functional (_Bind::operator()(Args&&...) volatile)
	(_Bind::operator()(Args&&...) const volatile)
	(_Bind_result::operator()(Args&&...) volatile)
	(_Bind_result::operator()(Args&&...) const volatile): Replace
	with deleted overload for C++20 and later.
	* testsuite/20_util/bind/cv_quals.cc: Check for deprecated
	warnings in C++17.
	* testsuite/20_util/bind/cv_quals_2.cc: Likewise, and check for
	ill-formed in C++20.

2022-09-16  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/abi.xml: Document GLIBCXX_3.4.30 version.
	* doc/html/manual/abi.html: Regenerate.

2022-09-12  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2022-09-12  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/106320
	* testsuite/std/ranges/adaptors/join.cc (test13): New test.

2022-09-07  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/106695
	* include/bits/std_thread.h (thread::_State_impl): Forward
	individual arguments to _Invoker constructor.
	(thread::_Invoker): Add constructor. Delete copies.
	* include/std/future (__future_base::_Deferred_state): Forward
	individual arguments to _Invoker constructor.
	(__future_base::_Async_state_impl): Likewise.
	* testsuite/30_threads/async/106695.cc: New test.
	* testsuite/30_threads/thread/106695.cc: New test.

2022-09-07  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/106607
	* include/bits/regex_compiler.tcc (_Compiler::_M_cur_int_value):
	Use built-ins to check for integer overflow in back-reference
	number.
	* testsuite/28_regex/basic_regex/106607.cc: New test.

2022-08-24  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-23  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/106589
	* include/std/variant (__do_visit): Handle is_void<R> for zero
	argument case.
	* testsuite/20_util/variant/visit_r.cc: Check std::visit<void>(v).

2022-08-23  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105678
	* doc/xml/manual/using.xml: Document -lstdc++_libbacktrace
	requirement for using std::stacktrace. Also adjust -frtti and
	-fexceptions to document non-default (i.e. negative) forms.
	* doc/html/*: Regenerate.

2022-08-19  Release Manager

	* GCC 12.2.0 released.

2022-08-05  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/string_view (basic_string_view(Range&&)): Add
	explicit as per P2499R0.
	* testsuite/21_strings/basic_string_view/cons/char/range_c++20.cc:
	Adjust implicit conversions. Check implicit conversions fail.
	* testsuite/21_strings/basic_string_view/cons/wchar_t/range_c++20.cc:
	Likewise.

2022-08-05  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/expected (unexpected::_M_val): Rename to _M_unex.
	(bad_expected_access::_M_val): Likewise.

2022-08-05  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-08-04  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/ios_base.h (__cpp_lib_ios_noreplace): Update
	value to 202207L.
	* include/std/version (__cpp_lib_ios_noreplace): Likewise.
	* testsuite/27_io/basic_ofstream/open/char/noreplace.cc: Check
	for new value.
	* testsuite/27_io/basic_ofstream/open/wchar_t/noreplace.cc:
	Likewise.

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

	Backported from master:
	2022-06-28  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_dir.cc (_Dir::dir_and_pathname):: Replace with
	current() returning _At_path.
	(_Dir::_Dir, _Dir::open_subdir, _Dir::do_unlink): Adjust.
	* src/filesystem/dir-common.h (_Dir_base::_At_path): New class.
	(_Dir_base::_Dir_Base, _Dir_base::openat): Use _At_path.
	* src/filesystem/dir.cc (_Dir::dir_and_pathname): Replace with
	current() returning _At_path.
	(_Dir::_Dir, _Dir::open_subdir): Adjust.

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

	Backported from master:
	2022-07-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104443
	* include/bits/stl_iterator.h (common_iterator::operator->):
	Change return type to just auto.

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

	Backported from master:
	2022-07-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/106248
	* include/std/istream [C++17] (operator>>(istream&, char*)):
	Set eofbit if we stopped extracting at EOF.
	* testsuite/27_io/basic_istream/extractors_character/char/pr106248.cc:
	New test.
	* testsuite/27_io/basic_istream/extractors_character/wchar_t/pr106248.cc:
	New test.

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

	Backported from master:
	2022-07-01  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_ops.h: Add nodiscard to all pure functions.
	* include/experimental/bits/fs_ops.h: Likewise.
	* testsuite/27_io/filesystem/operations/all.cc: Do not discard
	results of absolute and canonical.
	* testsuite/27_io/filesystem/operations/absolute.cc: Cast
	discarded result to void.
	* testsuite/27_io/filesystem/operations/canonical.cc: Likewise.
	* testsuite/27_io/filesystem/operations/exists.cc: Likewise.
	* testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/27_io/filesystem/operations/read_symlink.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/operations/canonical.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/exists.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/is_empty.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/read_symlink.cc:
	Likewise.
	* testsuite/experimental/filesystem/operations/temp_directory_path.cc:
	Likewise.

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

	Backported from master:
	2022-06-16  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105995
	* include/bits/basic_string.h (_M_use_local_data): Initialize
	the entire SSO buffer.
	* testsuite/21_strings/basic_string/cons/char/105995.cc: New test.

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

	Backported from master:
	2022-06-14  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/new_allocator.h: Fix indentation.
	* include/ext/malloc_allocator.h: Likewise.

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

	Backported from master:
	2022-06-14  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105957
	* include/bits/allocator.h (allocator::allocate): Check for
	overflow in constexpr allocation.
	* testsuite/20_util/allocator/105975.cc: New test.

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

	Backported from master:
	2022-06-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105844
	* include/experimental/numeric (experimental::gcd): Simplify
	assertions. Use __abs_r instead of __absu.
	(experimental::lcm): Likewise. Remove use of __detail::__lcm so
	overflow can be detected.
	* include/std/numeric (__detail::__absu): Rename to __abs_r and
	change to allow signed result type, so overflow can be detected.
	(__detail::__lcm): Remove.
	(gcd): Simplify assertions. Use __abs_r instead of __absu.
	(lcm): Likewise. Remove use of __detail::__lcm so overflow can
	be detected.
	* testsuite/26_numerics/gcd/gcd_neg.cc: Adjust dg-error lines.
	* testsuite/26_numerics/lcm/lcm_neg.cc: Likewise.
	* testsuite/26_numerics/gcd/105844.cc: New test.
	* testsuite/26_numerics/lcm/105844.cc: New test.

2022-07-26  Thomas Rodgers  <trodgers@redhat.com>

	Backported from master:
	2022-07-26  Thomas Rodgers  <trodgers@redhat.com>

	* include/bits/atomic_wait.h (__atomic_spin): Merge spin loops.

2022-07-22  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-28  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_dir.cc (_Dir::_Dir) [!_GLIBCXX_HAVE_OPENAT]:
	Always store pathname if we don't have openat or unlinkat,
	because the full path is needed to open sub-directories and
	remove entries.

2022-07-22  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2022-06-27  Alexandre Oliva  <oliva@adacore.com>

	* src/c++17/fs_dir.cc (dir_and_pathname): Use dirfd if
	_GLIBCXX_HAVE_OPENAT.

2022-07-22  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2022-06-24  Alexandre Oliva  <oliva@adacore.com>

	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for
	openat.
	* configure, config.h.in: Rebuilt.
	* src/filesystem/dir-common.h (openat): Use ::openat if
	_GLIBCXX_HAVE_OPENAT.
	* src/filesystem/dir.cc (dir_and_pathname): Use dirfd if
	_GLIBCXX_HAVE_OPENAT.

2022-07-22  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/stacktrace: Do not include <cxxabi.h>.
	(__cxa_demangle): Declare.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-07-20  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/100823
	* include/bits/stl_iterator.h (common_iterator): Define move
	constructor and move assignment operator.
	(common_iterator::_M_assign): New function implementing
	assignment.
	(common_iterator::operator=): Use _M_assign.
	(common_iterator::_S_valueless): New constant.
	* testsuite/24_iterators/common_iterator/100823.cc: New test.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-07-20  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (common_iterator): Fix incorrect
	uses of is_nothrow_assignable_v. Fix inconsistent constraints on
	friend declaration. Do not move argument in copy constructor.
	* testsuite/24_iterators/common_iterator/1.cc: Check for
	noexcept constructibnle/assignable.

2022-07-21  Nathan Sidwell  <nathan@acm.org>

	Backported from master:
	2022-05-26  Nathan Sidwell  <nathan@acm.org>

	* include/bits/hashtable.h: Include required headers.
	* include/bits/hashtable_policy.h: Likewise.
	* include/bits/stl_heap.h: Likewise.
	* include/bits/stl_iterator_base_funcs.h: Likewise.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-30  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/utility.h: Fix comment typos.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-28  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/from_chars/4.cc: Only use log2 if C99 math
	functions are available.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-23  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/random/random_device/entropy.cc: Use
	numeric_limits<unsigned>::digits.

2022-07-21  Marco Falke  <falke.marco@gmail.com>

	Backported from master:
	2022-07-19  Marco Falke  <falke.marco@gmail.com>

	* include/std/charconv (__from_chars_alnum_to_val): Replace
	implicit conversion from int to unsigned char with explicit
	cast.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88881
	* src/filesystem/ops.cc (has_trailing_slash): New helper
	function.
	(fs::status): Strip trailing slashes.
	(fs::symlink_status): Likewise.
	* testsuite/experimental/filesystem/operations/temp_directory_path.cc:
	Clean the environment before each test and use TMP instead of
	TMPDIR so the test passes on Windows.

2022-07-21  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105880
	* libsupc++/eh_globals.cc (eh_globals): Ensure constant init and
	prevent destruction during termination.
	(__eh_globals_init::_M_init): Replace with static member _S_init.
	(__cxxabiv1::__cxa_get_globals_fast): Update.
	(__cxxabiv1::__cxa_get_globals): Likewise.

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

	Backported from master:
	2022-07-01  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/106162
	* include/Makefile.am (largefile-config.h): Add
	stamp-${host_alias} prerequisite.
	* include/Makefile.in: Regenerate.

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

	Backported from master:
	2022-06-23  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/iterators/error_reporting.cc: Use
	rmdir to remove directories.
	* testsuite/experimental/filesystem/iterators/error_reporting.cc:
	Likewise.

2022-06-14  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-06-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/atomic (__atomic_val_t): Use __type_identity_t
	instead of atomic<T>::value_type, as per LWG 3220.
	* testsuite/29_atomics/atomic/lwg3220.cc: New test.

2022-06-14  Mark Mentovai  <mark@mentovai.com>

	Backported from master:
	2022-06-13  Mark Mentovai  <mark@mentovai.com>

	* include/experimental/bits/fs_path.h (__detail::__null_terminated):
	Rename to __nul_terminated to avoid colliding with a macro in
	Apple's SDK.

2022-06-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105671
	* include/std/sstream (basic_stringbuf::_M_high_mark): Add
	always_inline attribute.

2022-06-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105681
	* include/ext/pb_ds/detail/resize_policy/hash_prime_size_policy_imp.hpp:
	Limit ga_sizes array to values that fit in size_t.
	* include/ext/random [__SIZE_WIDTH < 32] (sfmt86243)
	(sfmt86243_64, sfmt132049, sfmt132049_64, sfmt216091)
	(sfmt216091_64): Do not declare.

2022-06-08  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/basic_string.h: Do not include <ext/atomicity.h>
	here.
	* include/bits/cow_string.h: Include it here.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (StdErrorCodePrinter): Make
	lookup for ios_errc and future_errc check versioned namespace.
	(StdAtomicPrinter): Strip versioned namespace from typename.

2022-05-27  François Dumont  <fdumont@gcc.gnu.org>

	Backported from master:
	2022-05-26  François Dumont  <fdumont@gcc.gnu.org>

	* python/libstdcxx/v6/printers.py (StdSpanPrinter.__init__):
	Strip typename from version namespace.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

	* python/libstdcxx/v6/printers.py (SharedPointerPrinter): Strip
	versioned namespace from the template argument too.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-26  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/stl_iterator.h (counted_iterator::operator++(int)):
	Add 'constexpr' as per LWG 3643.
	* testsuite/24_iterators/counted_iterator/lwg3643.cc: New test.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-19  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/memory_resource (polymorphic_allocator): Add
	non-template equality operator, as proposed for LWG 3683.
	* testsuite/20_util/polymorphic_allocator/lwg3683.cc: New test.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-20  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/random/bernoulli_distribution/operators/values.cc:
	Run fewer iterations for simulator targets.
	* testsuite/26_numerics/random/binomial_distribution/operators/values.cc:
	Likewise.
	* testsuite/26_numerics/random/discrete_distribution/operators/values.cc:
	Likewise.
	* testsuite/26_numerics/random/geometric_distribution/operators/values.cc:
	Likewise.
	* testsuite/26_numerics/random/negative_binomial_distribution/operators/values.cc:
	Likewise.
	* testsuite/26_numerics/random/poisson_distribution/operators/values.cc:
	Likewise.
	* testsuite/26_numerics/random/uniform_int_distribution/operators/values.cc:
	Likewise.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-17  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/20_util/expected/synopsis.cc: Skip for versioned
	namespace.
	* testsuite/27_io/headers/iosfwd/synopsis.cc: Likewise.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/mofunc_impl.h: Fix doxygen command.

2022-05-27  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-13  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/future (launch): Make operators noexcept.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/prerequisites.xml: Fix attributes for external
	hyperlink.
	* doc/html/manual/setup.html: Regenerate.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2023.xml: Update with gcc-12 support.
	* doc/html/*: Regenerate.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/intro.xml: Include new chapter.
	* doc/xml/manual/status_cxx2020.xml: Tweak release numbers.
	* doc/xml/manual/status_cxx2023.xml: New file.
	* doc/html/*: Regenerate.

2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-16  Jonathan Wakely  <jwakely@redhat.com>

	* doc/html/manual/status.html: Regenerate.
	* doc/xml/manual/status_cxx2020.xml: Fix supported version for
	C++20 bit operations.

2022-05-13  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2022-05-06  Alexandre Oliva  <oliva@adacore.com>

	* include/experimental/bits/simd.h [__ALTIVEC__]: Require VSX
	for double, long long, and 64-bit long intrinsic types.
	[__ALTIVEC__] (__intrinsic_type): Mention 128-bit in
	preexisting long double diagnostic, adjust no-VSX double
	diagnostic to cover 64-bit long double as well.

2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105284
	* include/std/iosfwd: Add declarations for <spanstream> class
	templates and typedefs.
	* include/std/spanstream (basic_spanbuf, basic_ispanstream)
	(basic_ospanstream, basic_spanstream): Remove default template
	arguments.
	* testsuite/27_io/headers/iosfwd/synopsis.cc: Add <spanstream>
	declarations.
	* testsuite/27_io/headers/iosfwd/types.cc: Check <spanstream>
	default arguments.

2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-10  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105284
	* include/std/iosfwd: Add declarations for <synstream> class
	templates and typedefs.
	* include/std/syncstream (basic_syncbuf, basic_osyncstream):
	Remove default template arguments.
	* testsuite/27_io/headers/iosfwd/synopsis.cc: New test.
	* testsuite/27_io/headers/iosfwd/types.cc: New test.

2022-05-09  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/104731
	* testsuite/27_io/filesystem/iterators/error_reporting.cc:
	Use a trailing char array as storage for dirent::d_name.

2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-05-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105502
	* include/bits/random.tcc
	(operator>>(basic_istream<C,T>&, normal_distribution<R>&)):
	Update state when __state_avail is false.
	* testsuite/26_numerics/random/normal_distribution/operators/serialize.cc:
	Check that deserialized object equals serialized one.

2022-05-06  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2022-05-02  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/103911
	* src/c++17/floating_from_chars.cc (find_end_of_float): Accept
	two delimeters for the exponent part in the form of a possibly
	NULL string of length two.  Don't use std::tolower.
	(pattern): Adjust calls to find_end_of_float accordingly.

2022-05-06  Alexandre Oliva  <oliva@adacore.com>

	Backported from master:
	2022-05-03  Alexandre Oliva  <oliva@adacore.com>

	PR c++/105324
	* testsuite/20_util/from_chars/pr105324.cc: Guard test body
	with conditional for floating-point overloads of from_char.

2022-05-06  Release Manager

	* GCC 12.1.0 released.

2022-05-02  Patrick Palka  <ppalka@redhat.com>

	Backported from master:
	2022-05-02  Patrick Palka  <ppalka@redhat.com>

	PR libstdc++/105441
	* src/c++17/floating_from_chars.cc (__floating_from_chars_hex):
	Also accept 'P' as the start of the exponent.
	* testsuite/20_util/from_chars/7.cc: Add corresponding testcase.

2022-04-29  Jonathan Wakely  <jwakely@redhat.com>

	Backported from master:
	2022-04-29  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/105417
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt:
	Regenerate.
	* src/c++11/compatibility-ldbl-alt128.cc [_GLIBCXX_USE_DUAL_ABI]:
	Define __gnu_ieee128::num_get<C>::_M_extract_int[abi:cxx11]<I>
	symbols as aliases for corresponding symbols without abi-tag.

2022-04-29  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.

2022-04-28  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx1998.xml: Refer to GCC 12 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.

2022-04-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/99290
	* src/c++17/fs_ops.cc (fs::copy): Pass error_code to
	directory_iterator constructor, and check on each iteration.
	* src/filesystem/ops.cc (fs::copy): Likewise.
	* testsuite/27_io/filesystem/operations/copy.cc: Check for
	errors during recursion.
	* testsuite/experimental/filesystem/operations/copy.cc:
	Likewise.

2022-04-28  François Dumont  <fdumont@gcc.gnu.org>

	* config/abi/pre/gnu-versioned-namespace.ver: Remove
	std::random_device::* pattern.

2022-04-27  Jakub Jelinek  <jakub@redhat.com>

	* config/abi/post/x86_64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/x86_64-linux-gnu/32/baseline_symbols.txt: Update.
	* config/abi/post/i486-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/aarch64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/s390x-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/baseline_symbols.txt: Update.
	* config/abi/post/powerpc64-linux-gnu/32/baseline_symbols.txt: Update.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

	PR libstdc++/103866
	* acinclude.m4 (GLIBCXX_COMPUTE_STDIO_INTEGER_CONSTANTS): Do
	nothing for freestanding builds.
	(GLIBCXX_ENABLE_HOSTED): Define FREESTANDING_FLAGS.
	* configure.ac: Do not use AC_LIBTOOL_DLOPEN when configured
	with --without-headers.  Do not use GCC_HEADER_STDINT for
	freestanding builds.
	* libsupc++/Makefile.am (HOSTED_CXXFLAGS): Use -ffreestanding
	for freestanding builds.
	* configure: Regenerate.
	* Makefile.in: Regenerate.
	* doc/Makefile.in: Regenerate.
	* include/Makefile.in: Regenerate.
	* libsupc++/Makefile.in: Regenerate.
	* po/Makefile.in: Regenerate.
	* python/Makefile.in: Regenerate.
	* src/Makefile.in: Regenerate.
	* src/c++11/Makefile.in: Regenerate.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++20/Makefile.in: Regenerate.
	* src/c++98/Makefile.in: Regenerate.
	* src/filesystem/Makefile.in: Regenerate.
	* testsuite/Makefile.in: Regenerate.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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


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