2019-03-01  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_allocator.h (__gnu_test::memory_resource)
	[!__cpp_sized_deallocation]: Do not pass size to operator delete.

	* include/std/memory (uses_allocator_construction_args): New set of
	overloaded functions.
	(make_obj_using_allocator, uninitialized_construct_using_allocator):
	New functions.
	* include/std/memory_resource (polymorphic_allocator::construct)
	[__cplusplus > 201703l]: Replace all overloads with a single function
	using uses_allocator_construction_args.
	* testsuite/20_util/polymorphic_allocator/construct_c++2a.cc: New
	test.
	* testsuite/20_util/uses_allocator/make_obj.cc: New test.

2019-02-27  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89466
	* acinclude.m4 (GLIBCXX_CONFIGURE_DOCBOOK): Reorder check for local
	stylesheet directories before check for xsltproc. Try to use
	xmlcatalog to find local stylesheet directory before trying hardcoded
	paths. Add path used by suse to hardcoded paths. Adjust xsltproc
	check to look for the same stylesheet as doc/Makefile.am uses. Don't
	use xsltproc if xmlcatalog fails to find a local stylesheet.
	* configure.ac: Check for xmlcatalog.
	* Makefile.in: Regenerate.
	* configure: Likewise.
	* doc/Makefile.in: Likewise.
	* include/Makefile.in: Likewise.
	* libsupc++/Makefile.in: Likewise.
	* po/Makefile.in: Likewise.
	* python/Makefile.in: Likewise.
	* src/Makefile.in: Likewise.
	* src/c++11/Makefile.in: Likewise.
	* src/c++17/Makefile.in: Likewise.
	* src/c++98/Makefile.in: Likewise.
	* src/filesystem/Makefile.in: Likewise.
	* testsuite/Makefile.in: Likewise.

2019-02-26  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89477
	* include/bits/alloc_traits.h (_RequireNotAllocator): New helper for
	container deduction guides.
	* include/bits/hashtable.h (_RequireNotAllocatorOrIntegral): Likewise.
	* include/bits/stl_map.h (map): Use _RequireNotAllocator to constrain
	parameters in deduction guides.
	* include/bits/stl_multimap.h (multimap): Likewise.
	* include/bits/stl_multiset.h (multiset): Likewise.
	* include/bits/stl_queue.h (queue, priority_queue): Likewise.
	* include/bits/stl_set.h (set): Likewise.
	* include/bits/stl_stack.h (stack): Likewise.
	* include/bits/unordered_map.h (unordered_map, unordered_multimap):
	use _RequireNotAllocator and _RequireNotAllocatorOrIntegral to
	constrain parameters in deduction guides.
	* include/bits/unordered_set.h (unordered_set, unordered_multiset):
	Likewise.
	* testsuite/23_containers/map/cons/deduction.cc: Test additional
	deduction cases.
	* testsuite/23_containers/multiset/cons/deduction.cc: Likewise.
	* testsuite/23_containers/set/cons/deduction.cc: Likewise.
	* testsuite/23_containers/unordered_map/cons/deduction.cc: Likewise.
	* testsuite/23_containers/unordered_multimap/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_multiset/cons/deduction.cc:
	Likewise.
	* testsuite/23_containers/unordered_set/cons/deduction.cc: Likewise.

	PR libstdc++/89416
	* include/bits/alloc_traits.h (__is_alloc_insertable_impl): Change
	to class template and partial specialization using void_t.
	(__is_copy_insertable, __is_move_insertable): Adjust base class.

2019-02-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89416
	* include/bits/alloc_traits.h (__is_alloc_insertable_impl): Make
	copy and move members public.

2019-02-23  Jonathan Wakely  <jwakely@redhat.com>

	* include/std/type_traits (__underlying_type_impl): New helper to
	make underlying_type SFINAE-friendly.
	(underlying_type): Derive from __underlying_type_impl.
	* testsuite/20_util/underlying_type/requirements/typedefs-3.cc: New
	test.

	PR libstdc++/89446
	* include/bits/char_traits.h (__constant_char_array): Check index is
	in range before dereferencing.
	(char_traits<char>::compare, char_traits<char>::find)
	(char_traits<char8_t>::compare, char_traits<char8_t>::find): Return
	immediately if n is zero.
	(char_traits<wchar_t>::compare, char_traits<wchar_t>::find): Likewise.
	Remove workarounds for PR 67026.
	* testsuite/21_strings/basic_string_view/operators/char/89446.cc:
	New test.
	* testsuite/21_strings/basic_string_view/operators/wchar_t/89446.cc:
	New test.

2019-02-22  Eric Botcazou  <ebotcazou@adacore.com>

	* config/abi/post/sparc64-linux-gnu/baseline_symbols.txt: Adjust.
	* config/abi/post/sparc64-linux-gnu/32/baseline_symbols.txt: Likewise.

2019-02-22  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/89402
	* src/c++98/compatibility-ldbl.cc (_ZNKSt4hashIeEclEe): Change return
	type to std::size_t and argument to type to long double.

2019-02-22  Eric Botcazou  <ebotcazou@adacore.com>

	* configure.host (abi_baseline_pair): Adjust for SPARC64/Linux.
	* config/abi/post/sparc64-linux-gnu: New directory.
	* config/abi/post/sparc64-linux-gnu/baseline_symbols.txt: New file.
	* config/abi/post/sparc64-linux-gnu/32: New directory.
	* config/abi/post/sparc64-linux-gnu/32/baseline_symbols.txt: New file.

2019-02-21  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/29_atomics/headers/atomic/types_std_c++20.cc: New test.
	* testsuite/29_atomics/headers/atomic/types_std_c++20_neg.cc: New
	test.

2019-02-22  Tom Honermann  <tom@honermann.net>

	* python/libstdcxx/v6/printers.py (register_type_printers): Add type
	printers for u8string and u8string_view.

2019-02-22  Tom Honermann  <tom@honermann.net>

	* testsuite/18_support/byte/ops.cc: Validate
	std::to_integer<char8_t>, std::to_integer<char16_t>, and
	std::to_integer<char32_t>.
	* testsuite/18_support/numeric_limits/dr559.cc: Validate
	std::numeric_limits<char8_t>.
	* testsuite/18_support/numeric_limits/lowest.cc: Validate
	std::numeric_limits<char8_t>::lowest().
	* testsuite/18_support/numeric_limits/max_digits10.cc: Validate
	std::numeric_limits<char8_t>::max_digits10.
	* testsuite/18_support/type_info/fundamental.cc: Validate
	typeinfo for char8_t.
	* testsuite/20_util/from_chars/1_c++20_neg.cc: New test, validating
	std::from_chars with char8_t.
	* testsuite/20_util/hash/requirements/explicit_instantiation.cc:
	Validate explicit instantiation of std::hash<char8_t>.
	* testsuite/20_util/is_integral/value.cc: Validate
	std::is_integral<char8_t>.
	* testsuite/20_util/make_signed/requirements/typedefs-4.cc:
	Validate std::make_signed<char8_t>.
	* testsuite/21_strings/basic_string/cons/char/deduction.cc:
	Validate u8string construction from char8_t sources.
	* testsuite/21_strings/basic_string/types/pmr_typedefs.cc: Validate
	std::pmr::u8string.
	* testsuite/21_strings/basic_string_view/operations/compare/
	char/70483.cc: Validate substr operations on u8string_view.
	* testsuite/21_strings/basic_string_view/typedefs.cc: Validate that
	the u8string_view typedef is defined.
	* testsuite/21_strings/char_traits/requirements/
	constexpr_functions.cc: Validate char_traits<char8_t> constexpr
	member functions.
	* testsuite/21_strings/char_traits/requirements/
	constexpr_functions_c++17.cc: Validate char_traits<char8_t> C++17
	constexpr member functions.
	* testsuite/21_strings/headers/string/types_std_c++0x.cc: Validate
	that the u8string typedef is defined.
	* testsuite/22_locale/locale/cons/unicode.cc: Validate the presence
	of the std::codecvt<char16_t, char8_t, std::mbstate_t> and
	std::codecvt<char32_t, char8_t, std::mbstate_t> facets.
	* testsuite/29_atomics/atomic/cons/assign_neg.cc: Update line
	numbers.
	* testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/cons/assign_neg.cc:
	Likewise.
	* testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
	* testsuite/29_atomics/atomic_integral/is_always_lock_free.cc:
	Validate std::atomic<char8_t>::is_always_lock_free
	* testsuite/29_atomics/atomic_integral/operators/bitwise_neg.cc:
	Update line numbers.
	* testsuite/29_atomics/atomic_integral/operators/decrement_neg.cc:
	Likewise.
	* testsuite/29_atomics/atomic_integral/operators/increment_neg.cc:
	Likewise.
	* testsuite/experimental/polymorphic_allocator/pmr_typedefs_string.cc:
	Validate std::experimental::pmr::u8string.
	* testsuite/experimental/string_view/typedefs.cc: Validate that the
	u8string_view typedef is defined.
	* testsuite/util/testsuite_common_types.h: Add char8_t, char16_t and
	char32_t to the typelists.

2019-02-22  Tom Honermann  <tom@honermann.net>

	* include/ext/typelist.h: Constrain a partial specialization of
	typelist::detail::append_ to only match chain<T1,T2>.

2019-02-21  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89416
	* include/bits/alloc_traits.h (__is_alloc_insertable_impl): Replace
	class template with class. Replace move and copy member types with
	member alias templates, so they are only instantiated when needed.
	(__is_copy_insertable, __is_move_insertable): Adjust base class.
	* testsuite/23_containers/vector/modifiers/push_back/89130.cc: Enable
	test for C++11/14/17 as well.
	* testsuite/23_containers/vector/modifiers/push_back/89416.cc: New
	test.

2019-02-20  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/89402
	* src/c++98/compatibility-ldbl.cc (_ZNKSt4hashIeEclEe): Add
	_GLIBCXX_PURE to the alias declaration.

2019-02-19  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/21_strings/basic_string/literals/types.cc
	[_GLIBCXX_USE_CHAR8_T]: Adjust expected string type for u8 literal.
	* testsuite/21_strings/basic_string/literals/values.cc
	[_GLIBCXX_USE_CHAR8_T]: Likewise.
	* testsuite/22_locale/codecvt/char16_t.cc: Adjust for u8 literals
	potentially having different type.
	* testsuite/22_locale/codecvt/char32_t.cc: Likewise.
	* testsuite/22_locale/codecvt/codecvt_utf8/79980.cc: Cast u8 literal
	to char.
	* testsuite/22_locale/codecvt/codecvt_utf8/wchar_t/1.cc: Likewise.
	* testsuite/22_locale/codecvt/utf8.cc: Likewise.
	* testsuite/22_locale/conversions/string/2.cc: Remove u8 prefix from
	string literals only using basic character set.
	* testsuite/22_locale/conversions/string/3.cc: Likewise. Cast other
	u8 literals to char.
	* testsuite/29_atomics/headers/atomic/macros.cc [_GLIBCXX_USE_CHAR8_T]:
	Test ATOMIC_CHAR8_T_LOCK_FREE.
	Add missing #error to ATOMIC_CHAR16_T_LOCK_FREE test.
	* testsuite/29_atomics/headers/atomic/types_std_c++0x.cc
	[_GLIBCXX_USE_CHAR8_T]: Check for std::atomic_char8_t.
	* testsuite/experimental/string_view/literals/types.cc
	[_GLIBCXX_USE_CHAR8_T]: Adjust expected string_view type for u8
	literal.
	* testsuite/experimental/string_view/literals/values.cc
	[_GLIBCXX_USE_CHAR8_T]: Likewise.

2019-02-19  Tom Honermann  <tom@honermann.net>

	* testsuite/18_support/numeric_limits/char8_t.cc: New test cloned
	from char16_32_t.cc; validates numeric_limits<char8_t>.
	* testsuite/21_strings/basic_string/literals/types-char8_t.cc: New
	test cloned from types.cc; validates operator""s for char8_t
	returns u8string.
	* testsuite/21_strings/basic_string/literals/values-char8_t.cc: New
	test cloned from values.cc; validates construction and comparison
	of u8string values.
	* testsuite/21_strings/basic_string/requirements/
	/explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	basic_string<char8_t>.
	* testsuite/21_strings/basic_string_view/literals/types-char8_t.cc:
	New test cloned from types.cc; validates operator""sv for char8_t
	returns u8string_view.
	* testsuite/21_strings/basic_string_view/literals/
	values-char8_t.cc: New test cloned from values.cc; validates
	construction and comparison of u8string_view values.
	* testsuite/21_strings/basic_string_view/requirements/
	explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	basic_string_view<char8_t>.
	* testsuite/21_strings/char_traits/requirements/char8_t/65049.cc:
	New test cloned from char16_t/65049.cc; validates that
	char_traits<char8_t> is not vulnerable to the concerns in PR65049.
	* testsuite/21_strings/char_traits/requirements/char8_t/
	typedefs.cc: New test cloned from char16_t/typedefs.cc; validates
	that char_traits<char8_t> member typedefs are present and correct.
	* testsuite/21_strings/char_traits/requirements/
	explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	char_traits<char8_t>.
	* testsuite/22_locale/codecvt/char16_t-char8_t.cc: New test cloned
	from char16_t.cc: validates
	codecvt<char16_t, char8_t, mbstate_t>.
	* testsuite/22_locale/codecvt/char32_t-char8_t.cc: New test cloned
	from char32_t.cc: validates
	codecvt<char32_t, char8_t, mbstate_t>.
	* testsuite/22_locale/codecvt/utf8-char8_t.cc: New test cloned from
	utf8.cc; validates codecvt<char16_t, char8_t, std::mbstate_t> and
	codecvt<char32_t, char8_t, std::mbstate_t>.
	* testsuite/27_io/filesystem/path/native/string-char8_t.cc: New
	test cloned from string.cc; validates filesystem::path construction
	from char8_t input.
	* testsuite/experimental/feat-char8_t.cc: New test; validates that
	the __cpp_lib_char8_t feature test macro is defined with the
	correct value.
	* testsuite/experimental/filesystem/path/native/string-char8_t.cc:
	New test cloned from string.cc; validates filesystem::path
	construction from char8_t input.
	* testsuite/experimental/string_view/literals/types-char8_t.cc: New
	test cloned from types.cc; validates operator""sv for char8_t
	returns u8string_view.
	* testsuite/experimental/string_view/literals/values-char8_t.cc:
	New test cloned from values.cc; validates construction and
	comparison of u8string_view values.
	* testsuite/experimental/string_view/requirements/
	explicit_instantiation/char8_t/1.cc: New test cloned from
	char16_t/1.cc; validates explicit instantiation of
	basic_string_view<char8_t>.
	* testsuite/ext/char8_t/atomic-1.cc: New test; validates that
	ATOMIC_CHAR8_T_LOCK_FREE is not defined if char8_t support is not
	enabled.

2019-02-19  Tom Honermann  <tom@honermann.net>

	P0482R5 char8_t: Standard library support
	* config/abi/pre/gnu-versioned-namespace.ver (CXXABI_2.0): Add
	typeinfo symbols for char8_t.
	* config/abi/pre/gnu.ver: Add CXXABI_1.3.12.
	(GLIBCXX_3.4.26): Add symbols for specializations of
	numeric_limits and codecvt that involve char8_t.
	(CXXABI_1.3.12): Add typeinfo symbols for char8_t.
	* include/bits/atomic_base.h: Add atomic_char8_t.
	* include/bits/basic_string.h: Add std::hash<u8string> and
	operator""s(const char8_t*, size_t).
	* include/bits/c++config: Define _GLIBCXX_USE_CHAR8_T and
	__cpp_lib_char8_t.
	* include/bits/char_traits.h: Add char_traits<char8_t>.
	* include/bits/codecvt.h: Add
	codecvt<char16_t, char8_t, mbstate_t>,
	codecvt<char32_t, char8_t, mbstate_t>,
	codecvt_byname<char16_t, char8_t, mbstate_t>, and
	codecvt_byname<char32_t, char8_t, mbstate_t>.
	* include/bits/cpp_type_traits.h: Add __is_integer<char8_t> to
	recognize char8_t as an integral type.
	* include/bits/fs_path.h: (path::__is_encoded_char): Recognize
	char8_t.
	(path::u8string): Return std::u8string when char8_t support is
	enabled.
	(path::generic_u8string): Likewise.
	(path::_S_convert): Handle conversion from char8_t input.
	(path::_S_str_convert): Likewise.
	* include/bits/functional_hash.h: Add hash<char8_t>.
	* include/bits/locale_conv.h (__str_codecvt_out): Add overloads for
	char8_t.
	* include/bits/locale_facets.h (_GLIBCXX_NUM_UNICODE_FACETS): Bump
	for new char8_t specializations.
	* include/bits/localefwd.h: Add missing declarations of
	codecvt<char16_t, char, mbstate_t> and
	codecvt<char32_t, char, mbstate_t>.  Add char8_t declarations
	codecvt<char16_t, char8_t, mbstate_t> and
	codecvt<char32_t, char8_t, mbstate_t>.
	* include/bits/postypes.h: Add u8streampos
	* include/bits/stringfwd.h: Add declarations of
	char_traits<char8_t> and u8string.
	* include/c_global/cstddef: Add __byte_operand<char8_t>.
	* include/experimental/bits/fs_path.h (path::__is_encoded_char):
	Recognize char8_t.
	(path::u8string): Return std::u8string when char8_t support is
	enabled.
	(path::generic_u8string): Likewise.
	(path::_S_convert): Handle conversion from char8_t input.
	(path::_S_str_convert): Likewise.
	* include/experimental/string: Add u8string.
	* include/experimental/string_view: Add u8string_view,
	hash<experimental::u8string_view>, and
	operator""sv(const char8_t*, size_t).
	* include/std/atomic: Add atomic<char8_t> and atomic_char8_t.
	* include/std/charconv (__is_int_to_chars_type): Recognize char8_t
	as a character type.
	* include/std/limits: Add numeric_limits<char8_t>.
	* include/std/string_view: Add u8string_view,
	hash<experimental::u8string_view>, and
	operator""sv(const char8_t*, size_t).
	* include/std/type_traits: Add __is_integral_helper<char8_t>,
	__make_unsigned<char8_t>, and __make_signed<char8_t>.
	* libsupc++/atomic_lockfree_defines.h: Define
	ATOMIC_CHAR8_T_LOCK_FREE.
	* src/c++11/Makefile.am: Compile with -fchar8_t when compiling
	codecvt.cc and limits.cc so that char8_t specializations of
	numeric_limits and codecvt and emitted.
	* src/c++11/Makefile.in: Likewise.
	* src/c++11/codecvt.cc: Define members of
	codecvt<char16_t, char8_t, mbstate_t>,
	codecvt<char32_t, char8_t, mbstate_t>,
	codecvt_byname<char16_t, char8_t, mbstate_t>, and
	codecvt_byname<char32_t, char8_t, mbstate_t>.
	* src/c++11/limits.cc: Define members of
	numeric_limits<char8_t>.
	* src/c++98/Makefile.am: Compile with -fchar8_t when compiling
	locale_init.cc and localename.cc.
	* src/c++98/Makefile.in: Likewise.
	* src/c++98/locale_init.cc: Add initialization for the
	codecvt<char16_t, char8_t, mbstate_t> and
	codecvt<char32_t, char8_t, mbstate_t> facets.
	* src/c++98/localename.cc: Likewise.
	* testsuite/util/testsuite_abi.cc: Validate ABI bump.

2019-02-18  Wilco Dijkstra  <wdijkstr@arm.com>

	* 27_io/filesystem/operations/all.cc: Add dg-require-filesystem-ts.
	* 27_io/filesystem/operations/resize_file.cc: Likewise.
	* 27_io/filesystem/path/generation/normal2.cc: Likewise.

2019-02-14  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update P0887R1 status.
	* doc/html/*: Regenerate.

	* doc/xml/manual/status_cxx2017.xml: Add P0063R3 to status table.
	* doc/html/*: Regenerate.

	* doc/xml/manual/intro.xml: Document LWG 2586 status.
	* include/bits/uses_allocator.h (__uses_alloc): Use const lvalue
	allocator type in is_constructible checks.
	* testsuite/20_util/scoped_allocator/69293_neg.cc: Adjust dg-error.
	* testsuite/20_util/scoped_allocator/dr2586.cc: New test.
	* testsuite/20_util/tuple/cons/allocators.cc: Add test using
	problematic type from LWG 2586 discussion.
	* testsuite/20_util/uses_allocator/69293_neg.cc: Adjust dg-error.
	* testsuite/20_util/uses_allocator/cons_neg.cc: Likewise.

	* configure.ac: Check for C11 timespec_get function.
	* crossconfig.m4 (freebsd, linux, gnu, cygwin, solaris, netbsd)
	(openbsd): Likewise
	* config.h.in: Regenerate.
	* configure: Regenerate.
	* include/c_global/ctime (timespec, timespec_get): Add to namespace
	std for C++17 and up.

	* doc/xml/manual/intro.xml: Document LWG 2537 status.
	* include/bits/stl_queue.h
	(priority_queue(const Compare&, const Container&, const Alloc&))
	(priority_queue(const Compare&, Container&&, const Alloc&)): Call
	make_heap.
	* testsuite/23_containers/priority_queue/dr2537.cc: New test.

	* doc/xml/manual/intro.xml: Document LWG 2566 status.
	* include/bits/stl_queue.h (queue, priority_queue): Add static
	assertions to enforce LWG 2566 requirement on value_type.
	* include/bits/stl_stack.h (stack): Likewise.

	PR middle-end/89303
	* testsuite/20_util/enable_shared_from_this/89303.cc: New test.

	* doc/xml/manual/intro.xml: Document LWG 2735 status.
	* include/bits/std_abs.h: Add comment about LWG 2735.
	* testsuite/26_numerics/headers/cstdlib/dr2735.cc: New test.

2019-02-13  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89345
	* include/std/version [__cpp_impl_destroying_delete]
	(__cpp_lib_destroying_delete): Only define for C++2a and later.
	* libsupc++/new [__cpp_impl_destroying_delete]
	(__cpp_lib_destroying_delete): Likewise.
	(destroying_delete_t, destroying_delete): Likewise, but define even
	when __cpp_impl_destroying_delete is not defined.
	* testsuite/18_support/destroying_delete.cc: New test.

2019-02-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89023
	* testsuite/17_intro/headers/c++2011/parallel_mode.cc: New test.
	* testsuite/17_intro/headers/c++2014/parallel_mode.cc: New test.
	* testsuite/17_intro/headers/c++2017/parallel_mode.cc: New test.
	* testsuite/28_regex/headers/regex/parallel_mode.cc: Remove.

2019-02-09  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/71044
	* include/bits/fs_path.h (path::has_root_name)
	(path::has_root_directory, path::has_root_path)
	(path::has_relative_path, path::has_parent_path)
	(path::has_filename, path::has_stem, path::has_extension)
	(path::is_absolute, path::is_relative, path::_M_find_extension): Add
	noexcept.
	* src/c++17/fs_path.cc (path::has_root_name)
	(path::has_root_directory, path::has_root_path)
	(path::has_relative_path, path::has_parent_path)
	(path::has_filename, path::_M_find_extension): Add noexcept.

2019-02-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89102 (partial)
	* include/std/type_traits (common_type<>): Define.
	(common_type<T>): Derive from common_type<T, T>.
	* testsuite/20_util/common_type/requirements/explicit_instantiation.cc:
	Test zero-length template argument list.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_1.cc:
	Test additional single argument cases.
	* testsuite/20_util/common_type/requirements/sfinae_friendly_2.cc:
	Adjust expected error.

2019-02-05  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89128
	* include/bits/stl_queue.h (queue, priority_queue): Add deduction
	guides.
	* include/bits/stl_stack.h (stack): Likewise.
	* testsuite/23_containers/priority_queue/deduction.cc: New test.
	* testsuite/23_containers/queue/deduction.cc: New test.
	* testsuite/23_containers/stack/deduction.cc: New test.

	PR libstdc++/89194
	* include/std/type_traits (__is_convertible_helper)
	(__is_convertible_helper<_From, _To, false>): Revert changes to
	support is_nothrow_convertible.
	(__is_nt_convertible_helper): New helper.
	(is_nothrow_convertible): Use __is_nt_convertible_helper.

	* testsuite/23_containers/vector/modifiers/push_back/49836.cc: Restore
	use of CopyConsOnlyType, but also test DelAnyAssign for completeness.

	PR libstdc++/89130
	* include/bits/alloc_traits.h (__is_copy_insertable_impl): Rename to
	__is_alloc_insertable_impl. Replace single type member with two
	members, one for each of copy and move insertable.
	(__is_move_insertable): New trait for internal use.
	* include/bits/stl_vector.h (vector::_S_nothrow_relocate(true_type))
	(vector::_S_nothrow_relocate(true_type)): New functions to
	conditionally check if __relocate_a can throw.
	(vector::_S_use_relocate()): Dispatch to _S_nothrow_relocate based
	on __is_move_insertable.
	(vector::_S_do_relocate): New overloaded functions to conditionally
	call __relocate_a.
	(vector::_S_relocate): New function that dispatches to _S_do_relocate
	based on _S_use_relocate.
	* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
	(vector::_M_default_append): Call _S_relocate instead of __relocate_a.
	* testsuite/23_containers/vector/modifiers/push_back/89130.cc: New.

	PR libstdc++/89090
	* include/bits/stl_uninitialized.h (__relocate_a_1): Make unused
	parameter unnamed. Add message to static assertion.
	* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
	(vector::_M_default_append): Use _GLIBCXX17_CONSTEXPR for if constexpr
	in C++11 code.

2019-02-05  Marc Glisse  <marc.glisse@inria.fr>

	PR libstdc++/87106
	* include/bits/stl_uninitialized.h (__is_trivially_relocatable):
	Rename...
	(__is_bitwise_relocatable): ... to this.
	(__relocate_a_1): Adapt.
	* include/bits/stl_deque.h (__is_trivially_relocatable): Rename...
	(__is_bitwise_relocatable): ... to this.

2019-01-30  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/89117
	* src/c++17/fs_path.cc (path::replace_extension): Erase extension from
	final component as well as from _M_pathname. Append the dot using
	operator+= instead of only to _M_pathname.
	(path::_M_find_extension): Reformat slightly.
	* testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
	Add more test cases.

2019-01-30  Ulrich Drepper  <drepper@redhat.com>

	* doc/xml/manual/status_cxx2020.xml: Update P0600 entry.

2019-01-29  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/26_numerics/headers/complex/synopsis.cc: Remove incorrect
	constexpr specifiers from arg and proj.

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Add missing exports for
	__shared_ptr instantiations used by gcc4-compatible ABI.

	* include/experimental/forward_list (experimental::erase): Qualify
	call to erase_if.
	* include/experimental/list (experimental::erase): Likewise.
	* include/std/forward_list (std::erase): Likewise.
	* include/std/list (std::erase): Likewise.

	* testsuite/20_util/reference_wrapper/result_type.cc: Disable for
	C++2a.
	* testsuite/20_util/reference_wrapper/typedefs-2.cc: Likewise.
	* testsuite/20_util/reference_wrapper/typedefs-3.cc: Likewise.
	* testsuite/20_util/reference_wrapper/typedefs.cc: Likewise.
	* testsuite/30_threads/async/54297.cc: Suppress nodiscard warning.
	* testsuite/ext/array_allocator/26875.cc: Likewise.
	* testsuite/ext/pool_allocator/allocate_chunk.cc: Likewise.
	* testsuite/util/replacement_memory_operators.h: Likewise.
	* testsuite/util/testsuite_allocator.h: Likewise.

	* include/std/memory_resource (__pool_resource::_M_unpooled): Use
	normal mode vector, even for debug mode.
	* include/std/vector [_GLIBCXX_DEBUG] (_GLIBCXX_STD_C::pmr::vector):
	Define alias template for normal mode vector.

2019-01-28  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/68737
	* config/locale/generic/c_locale.h (__convert_from_v)
	[_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF.
	* config/os/hpux/os_defines.h: Define _GLIBCXX_HAVE_BROKEN_VSNPRINTF.
	* include/bits/locale_facets.tcc (num_put::_M_insert_float)
	[_GLIBCXX_USE_C99_STDIO]: Also check _GLIBCXX_HAVE_BROKEN_VSNPRINTF.

2019-01-24  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88840
	* include/bits/stl_vector.h (vector::__use_relocate): Replace static
	data member with static member function _S_use_relocate().
	* include/bits/vector.tcc (vector::reserve, vector::_M_realloc_insert)
	(vector::_M_default_append): Use _S_use_relocate() instead of
	__use_relocate.

	* testsuite/27_io/filesystem/path/compare/strings.cc: Only compare
	sign of results.

2019-01-22  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88740
	* testsuite/util/testsuite_hooks.h [stderr] (VERIFY): Use fprintf to
	write to stderr instead of using printf.

2019-01-21  Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/86590
	* include/bits/char_traits.h (__constant_string_p,
	__constant_char_array_p): Use __builtin_is_constant_evaluated if
	available.

2019-01-20  Ulrich Drepper  <drepper@redhat.com>

	Implement C++20 P0600r1.
	* include/backward/hash_map: Add nodiscard attribute to empty.
	* include/backward/hash_set: Likewise.
	* backward/hashtable.h: Likewise.
	* include/bits/basic_string.h: Likewise.
	* include/bits/forward_list.h: Likewise.
	* include/bits/hashtable.h: Likewise.
	* include/bits/regex.h: Likewise.
	* include/bits/stl_deque.h: Likewise.
	* include/bits/stl_list.h: Likewise.
	* include/bits/stl_map.h: Likewise.
	* include/bits/stl_multimap.h: Likewise.
	* include/bits/stl_multiset.h: Likewise.
	* include/bits/stl_queue.h: Likewise.
	* include/bits/stl_set.h: Likewise.
	* include/bits/stl_stack.h: Likewise.
	* include/bits/stl_tree.h: Likewise.
	* include/bits/stl_vector.h: Likewise.
	* include/bits/unordered_map.h: Likewise.
	* include/bits/unordered_set.h: Likewise.
	* include/debug/array: Likewise.
	* include/experimental/any: Likewise.
	* include/experimental/bits/fs_path.h: Likewise.
	* include/experimental/internet: Likewise.
	* include/experimental/string_view: Likewise.
	* include/ext/pb_ds/detail/bin_search_tree_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/binary_heap_/binary_heap_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/binary_heap_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/cc_hash_table_map_/size_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/gp_hash_table_map_/gp_ht_map_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/gp_hash_table_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/
	info_fn_imps.hpp: Likewise.
	* include/ext/pb_ds/detail/left_child_next_sibling_heap_/
	left_child_next_sibling_heap_.hpp: Likewise.
	* include/ext/pb_ds/detail/list_update_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/list_update_map_/lu_map_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/ov_tree_map_/ov_tree_map_.hp:
	Likewise.
	* include/ext/pb_ds/detail/pat_trie_/info_fn_imps.hpp:
	Likewise.
	* include/ext/pb_ds/detail/pat_trie_/pat_trie_.hpp:
	Likewise.
	* include/ext/pb_ds/detail/rc_binomial_heap_/rc.hpp:
	Likewise.
	* include/ext/pb_ds/detail/tree_trace_base.hpp: Likewise.
	* include/ext/pb_ds/trie_policy.hpp: Likewise.
	* include/ext/rope: Likewise.
	* include/ext/slist: Likewise.
	* include/ext/vstring.h: Likewise.
	* include/profile/array: Likewise.
	* include/std/array: Likewise.
	* include/tr1/array: Likewise.
	* include/tr1/hashtable.h: Likewise.
	* include/tr1/regex: Likewise.
	* include/tr2/dynamic_bitset: Likewise.
	* include/bits/alloc_traits.h: Add nodiscard attribute to
	allocate.
	* include/experimental/memory_resource: Likewise.
	* include/ext/alloc_traits.h: Likewise.
	* include/ext/array_allocator.h: Likewise.
	* include/ext/bitmap_allocator.h: Likewise.
	* include/ext/debug_allocator.h: Likewise.
	* include/ext/extptr_allocator.h: Likewise.
	* include/ext/mt_allocator.h: Likewise.
	* include/ext/new_allocator.h: Likewise.
	* include/ext/pool_allocator.h: Likewise.
	* include/ext/throw_allocator.h: Likewise.
	* include/std/scoped_allocator: Likewise.
	* libsupc++/eh_alloc.cc: Likewise.
	* include/std/future: Add nodiscard attribute to async.
	* libsupc++/new: Add nodiscard attribute to new.

2019-01-18  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/87514
	PR libstdc++/87520
	PR libstdc++/88782
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export new symbol.
	* include/bits/shared_ptr.h
	(shared_ptr(_Sp_make_shared_tag, const Alloc&, Args&&...))
	(allocate_shared): Change to use new tag type.
	* include/bits/shared_ptr_base.h (_Sp_make_shared_tag::_S_eq):
	Declare new member function.
	(_Sp_alloc_shared_tag): Define new type.
	(_Sp_counted_ptr_inplace): Declare __shared_count<_Lp> as a friend.
	(_Sp_counted_ptr_inplace::_M_get_deleter) [!__cpp_rtti]: Use
	_Sp_make_shared_tag::_S_eq to check type_info.
	(__shared_count(Ptr, Deleter),__shared_count(Ptr, Deleter, Alloc)):
	Constrain to prevent being called with _Sp_alloc_shared_tag.
	(__shared_count(_Sp_make_shared_tag, const _Alloc&, Args&&...)):
	Replace constructor with ...
	(__shared_count(Tp*&, _Sp_alloc_shared_tag<_Alloc>, Args&&...)): Use
	reference parameter so address of the new object can be returned to
	the caller. Obtain the allocator from the tag type.
	(__shared_ptr(_Sp_make_shared_tag, const Alloc&, Args&&...)): Replace
	constructor with ...
	(__shared_ptr(_Sp_alloc_shared_tag<Alloc>, Args&&...)): Pass _M_ptr
	to the __shared_count constructor.
	(__allocate_shared): Change to use new tag type.
	* src/c++11/shared_ptr.cc (_Sp_make_shared_tag::_S_eq): Define.

2019-01-17  Jonathan Wakely  <jwakely@redhat.com>

	* src/c++17/fs_ops.cc
	(equivalent(const path&, const path&, error_code&))
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Use GetFileInformationByHandle to
	compare files instead of relying on incomplete info returned by stat.

	PR libstdc++/88884
	* src/c++17/fs_ops.cc (absolute(const path&, error_code&)): Do nothing
	if the path is already absolute.
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Normalize root-directory.
	[!_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Pass error_code to current_path.

	PR libstdc++/88881
	* src/c++17/fs_ops.cc (canonical(const path&, error_code&))
	[_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Normalize path, to match behaviour
	of filesystem::exists.
	(create_directories(const path&, error_code&)): Add assertions.
	(status(const path&, error_code&)) [_GLIBCXX_FILESYSTEM_IS_WINDOWS]:
	Add workaround for bug in _wstat for paths with trailing slash.
	* testsuite/27_io/filesystem/operations/create_directories.cc: Adjust
	for expected behaviour on mingw.
	* testsuite/experimental/filesystem/operations/create_directories.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/temp_directory_path.cc: Use
	"TMP" instead of "TMPDIR" and clean environment before each test. Do
	not test permissions on mingw targets.

2019-01-16  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Add exports for fstream
	constructors and open members taking wide strings. Fix patterns for
	filesystem::path members to match wstring_view parameters. Add
	exports for shared_ptr members used by directory iterators.
	* src/c++17/fs_ops.cc (remove(const path&, error_code&)): Clear the
	error code parameter if the file doesn't exist.
	* src/filesystem/ops.cc (remove(const path&, error_code&)):
	Likewise.
	* testsuite/27_io/filesystem/operations/canonical.cc: Fix expected
	values for mingw targets, where "/" is not an absolute path. Do not
	test symlinks on mingw targets.
	* testsuite/experimental/filesystem/operations/canonical.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy.cc: Do not test symlinks
	on mingw targets.
	* testsuite/experimental/filesystem/operations/copy.cc: Likewise.
	* testsuite/27_io/filesystem/operations/create_directories.cc: Check
	that each component of the path is created.
	* testsuite/experimental/filesystem/operations/create_directories.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/exists.cc: Do not test
	permissions on mingw targets.
	* testsuite/experimental/filesystem/operations/exists.cc: Likewise.
	* testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/experimental/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/27_io/filesystem/operations/permissions.cc: XFAIL for
	mingw targets.
	* testsuite/experimental/filesystem/operations/permissions.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/remove.cc: Do not test
	symlinks or permissions on mingw targets.
	* testsuite/experimental/filesystem/operations/remove.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Do not test
	symlinks on mingw targets.
	* testsuite/experimental/filesystem/operations/remove_all.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/status.cc: Do not test
	permissions on mingw targets.
	* testsuite/27_io/filesystem/operations/weakly_canonical.cc: Do not
	test symlinks on mingw targets.
	* testsuite/experimental/filesystem/operations/space.cc: Fix test
	for mingw targets.

2019-02-14  Ulrich Drepper  <drepper@redhat.com>

	PR libstdc++/88738
	Warn about unused comparisons of shared_ptr/unique_ptr
	* include/bits/c++config [_GLIBCXX_NODISCARD]: Define.
	* include/bits/shared_ptr.h: Use it for operator ==, !=,
	<, <=, >, >= for shared_ptr.
	* include/bits/unique_ptr.h: Likewise for unique_ptr.

2019-01-15  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/shared_ptr_base.h (__cpp_lib_shared_ptr_arrays): Define
	as 201611L, because P0497R0 changes are supported.
	* include/std/version (__cpp_lib_shared_ptr_arrays): Likewise.

	* include/bits/erase_if.h [__cplusplus > 201703L]
	(__cpp_lib_erase_if): Only define for C++2a.
	* include/std/iterator [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
	(__cpp_lib_null_iterators): Define.
	* include/std/version [__cplusplus >= 201402L && !_GLIBCXX_DEBUG]
	(__cpp_lib_null_iterators): Define.
	[__cpp_impl_destroying_delete] (__cpp_lib_destroying_delete): Define.

	* doc/xml/manual/status_cxx2017.xml: Document P0032R3 and P0307R2
	status.
	* include/bits/stl_uninitialized.h (__cpp_lib_raw_memory_algorithms):
	Define.
	* include/std/any (__cpp_lib_any): Define as 201606L, because P0032R3
	changes are supported.
	* include/std/optional (__cpp_lib_optional): Likewise.
	* include/std/variant (__cpp_lib_variant): Likewise.
	* include/std/version [!__STRICT_ANSI__]
	(__cpp_lib_uncaught_exceptions): Define as long integer.
	[__cplusplus >= 201703L] (__cpp_lib_any)
	(__cpp_lib_raw_memory_algorithms, __cpp_lib_uncaught_exceptions)
	(__cpp_lib_variant): Define for C++17.
	[__cplusplus >= 201703L] (__cpp_lib_optional): Update value and define
	as long integer.
	* libsupc++/exception (__cpp_lib_uncaught_exceptions): Define as long
	integer.

	* doc/xml/manual/status_cxx2020.xml: Update P1123R0 status.

2019-01-12  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88811
	PR libstdc++/83306
	* src/filesystem/path.cc: Fix typo. If first path is empty, show []
	before second path.
	* testsuite/experimental/filesystem/filesystem_error/cons.cc: New
	test.

2019-01-11  Jonathan Wakely  <jwakely@redhat.com>

	* doc/xml/manual/intro.xml: Include new section.
	* doc/xml/manual/status_cxx2017.xml: Document more
	implementation-defined properties of the library.
	* doc/xml/manual/status_cxx2020.xml: Document C++2a status.
	* doc/html/*: Regenerate.

	* include/bits/refwrap.h [__cplusplus > 201703L]
	(_Refwrap_base_arg1, _Refwrap_base_arg2, _Reference_wrapper_base)
	(_Reference_wrapper_base_memfun): Do not define for C++2a.
	(reference_wrapper): Do not derive from _Reference_wrapper_base_memfun
	for C++2a.
	(reference_wrapper::operator()): Add static assertion.
	* testsuite/20_util/reference_wrapper/incomplete.cc: New test.

	* include/std/chrono (duration_values::zero(), duration_values::min())
	(duration_values::max()): Add noexcept.
	(duration::zero(), duration::min(), duration::max()): Likewise.
	(time_point::zero(), time_point::min(), time_point::max()): Likewise.
	* testsuite/20_util/duration/requirements/noexcept.cc: New test.
	* testsuite/20_util/time_point/requirements/noexcept.cc: New test.

	* include/std/version (__cpp_lib_erase_if): Move to C++20 group.

2019-01-11  Jakub Jelinek  <jakub@redhat.com>

	* include/std/type_traits (__cpp_lib_is_constant_evaluated): Define.
	* include/std/version (__cpp_lib_is_constant_evaluated): Define.

2019-01-11  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88802
	* include/bits/functional_hash.h (hash<nullptr_t>): Define
	specialization for C++17 (P0513R0, LWG 2817).
	* testsuite/20_util/hash/nullptr.cc: New test.

	PR libstdc++/88125
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.6): Remove unused duplicate
	pattern for std::basic_stringbuf::str().

	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Correct recent changes to
	basic_ostream::operator<< patterns.

2019-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/27_io/filesystem/operations/last_write_time.cc: Fix
	test failures on targets with 32-bit time_t.

	* include/bits/erase_if.h: Define __cpp_lib_erase_if.
	* include/std/deque: Likewise.
	* include/std/forward_list: Likewise.
	* include/std/list: Likewise.
	* include/std/string: Likewise.
	* include/std/vector: Likewise.
	* include/std/version: Likewise.
	* testsuite/21_strings/basic_string/erasure.cc: Test macro.
	* testsuite/23_containers/deque/erasure.cc: Likewise.
	* testsuite/23_containers/forward_list/erasure.cc: Likewise.
	* testsuite/23_containers/list/erasure.cc: Likewise.
	* testsuite/23_containers/map/erasure.cc: Likewise.
	* testsuite/23_containers/set/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_map/erasure.cc: Likewise.
	* testsuite/23_containers/unordered_set/erasure.cc: Likewise.
	* testsuite/23_containers/vector/erasure.cc: Likewise.

	* include/experimental/internet [AI_NUMERICSERV]
	(resolver_base::numeric_service): Define conditionally.
	* testsuite/experimental/net/internet/resolver/base.cc: Test it
	conditionally.
	* testsuite/experimental/net/internet/resolver/ops/lookup.cc:
	Likewise.

2019-01-10  Ville Voutilainen  <ville.voutilainen@gmail.com>
	    Jonathan Wakely  <jwakely@redhat.com>

	Implement LWG 2221
	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Tighten patterns.
	(GLIBCXX_3.4.26): Add new exports.
	* include/Makefile.am: Add ostream-inst.cc. Move string-inst.cc to
	correct list of sources.
	* include/Makefile.in: Regenerate.
	* include/std/ostream (operator<<(nullptr_t)): New member function.
	* src/c++17/ostream-inst.cc: New file.
	* testsuite/27_io/basic_ostream/inserters_other/char/lwg2221.cc: New
	test.

2019-01-10  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/util/testsuite_fs.h (nonexistent_path): Include name
	of the source file containing the caller.
	* testsuite/27_io/filesystem/iterators/directory_iterator.cc: Remove
	directories created by test.
	* testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.
	* testsuite/experimental/filesystem/iterators/directory_iterator.cc:
	Likewise.
	* testsuite/experimental/filesystem/iterators/
	recursive_directory_iterator.cc: Likewise.

2019-01-10  Jakub Jelinek  <jakub@redhat.com>

	PR tree-optimization/88775
	* include/bits/stl_function.h (greater<_Tp*>::operator(),
	less<_Tp*>::operator(), greater_equal<_Tp*>::operator(),
	less_equal<_Tp*>::operator()): Use __builtin_is_constant_evaluated
	instead of __builtin_constant_p if available.  Don't bother with
	the pointer comparison in C++11 and earlier.

2019-01-09  Sandra Loosemore  <sandra@codesourcery.com>

	PR other/16615

	* include/ext/bitmap_allocator.h: Mechanically replace "can not"
	with "cannot".

2019-01-09  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/libstdc++-prettyprinters/cxx17.cc: Fix expected output
	for filesystem::path. Give variables more distinctive names.

	* include/std/optional (_Optional_payload_base::_M_copy_assign): New
	member function to perform non-trivial assignment.
	(_Optional_payload_base::_M_move_assign): Likewise.
	(_Optional_payload<T, true, false, true>::operator=)
	(_Optional_payload<T, true, true, false>::operator=)
	(_Optional_payload<T, true, false, false>::operator=): Call
	_M_copy_assign and/or _M_move_assign to do non-trivial assignments.

	PR libstdc++/88204
	* testsuite/26_numerics/complex/operators/more_constexpr.cc: Do not
	test std::complex<long double> if long double format is IBM128.
	* testsuite/26_numerics/complex/requirements/more_constexpr.cc:
	Likewise.

2019-01-08  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/libstdc++-prettyprinters/compat.cc: Test printer support
	for old std::unique_ptr layout.
	* testsuite/libstdc++-prettyprinters/cxx17.cc: Fix std::variant test
	to become valueless. Add filesystem::path tests.

	PR libstdc++/87855
	* include/std/optional (_Optional_payload_base): New class template
	for common code hoisted from _Optional_payload specializations. Use
	a template for the union, to allow a partial specialization for
	types with non-trivial destructors. Add constructors for in-place
	initialization to the union.
	(_Optional_payload(bool, const _Optional_payload&)): Use _M_construct
	to perform non-trivial copy construction, instead of relying on
	non-standard copy elision in a delegating constructor.
	(_Optional_payload(bool, _Optional_payload&&)): Likewise for
	non-trivial move construction.
	(_Optional_payload): Derive from _Optional_payload_base and use it
	for everything except the non-trivial assignment operators, which are
	defined as needed.
	(_Optional_payload<false, C, M>): Derive from the specialization
	_Optional_payload<true, false, false> and add a destructor.
	(_Optional_base_impl::_M_destruct, _Optional_base_impl::_M_reset):
	Forward to corresponding members of _Optional_payload.
	(_Optional_base_impl::_M_is_engaged, _Optional_base_impl::_M_get):
	Hoist common members from _Optional_base.
	(_Optional_base): Make all members and base class public.
	(_Optional_base::_M_get, _Optional_base::_M_is_engaged): Move to
	_Optional_base_impl.
	* python/libstdcxx/v6/printers.py (StdExpOptionalPrinter): Add
	support for new std::optional layout.
	* testsuite/libstdc++-prettyprinters/compat.cc: New test.

	PR libstdc++/88066
	* include/bits/locale_conv.h: Use <> for includes not "".
	* include/ext/random: Likewise.
	* include/ext/vstring.h: Likewise.

2019-01-08  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Tighten existing patterns.
	(GLIBCXX_3.4.21): Likewise.

2019-01-08  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88749
	* src/filesystem/ops.cc (last_write_time): Fix preprocessor condition
	to match the one that controls whether utimbuf and utime are declared.

2019-01-07  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/87787
	* include/bits/char_traits.h (char_traits::move): Do not pass null
	pointers to memmove.
	* include/bits/locale_facets.h
	(ctype<char>::widen(const char*, const char*, char*)): Do not
	pass null pointers to memcpy.
	(ctype<char>::narrow(const char*, const char*, char, char*)):
	Likewise.
	(ctype<char>::do_widen(const char*, const char*, char*)):
	Likewise.
	(ctype<char>::do_narrow(const char*, const char*, char, char*)):
	Likewise.

	* doc/xml/manual/spine.xml: Update copyright years.
	* doc/xml/manual/status_cxx2017.xml: Adjust note about -lstdc++fs.
	* doc/xml/manual/using.xml: Remove requirement to link with -lstdc++fs
	for C++17 filesystem library.
	* doc/html/*: Regenerate.

	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for truncate.
	* config.h.in: Regenerate.
	* config/abi/pre/gnu.ver: Order patterns for filesystem operations
	alphabetically and add missing entries for copy_symlink,
	hard_link_count, rename, and resize_file.
	* configure: Regenerate.
	* src/c++17/fs_ops.cc (resize_file): Remove #if so posix::truncate is
	used unconditionally.
	* src/filesystem/ops-common.h (__gnu_posix::truncate)
	[!_GLIBCXX_HAVE_TRUNCATE]: Provide fallback definition that only
	supports truncating to zero length.
	* testsuite/27_io/filesystem/operations/all.cc: New test.
	* testsuite/27_io/filesystem/operations/resize_file.cc: New test.

2019-01-06  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/86756
	* acinclude.m4 (GLIBCXX_CHECK_FILESYSTEM_DEPS): Check for utime and
	lstat and define _GLIBCXX_USE_UTIME and _GLIBCXX_USE_LSTAT.
	* config.h.in: Regenerate.
	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export symbols for
	remaining std::filesystem types and functions.
	* configure: Regenerate.
	* src/c++17/Makefile.am: Add C++17 filesystem sources.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/cow-fs_dir.cc: Move src/filesystem/cow-std-dir.cc to
	here, and change name of included file.
	* src/c++17/cow-fs_ops.cc: Move src/filesystem/cow-std-ops.cc to
	here, and change name of included file.
	* src/c++17/fs_dir.cc: Move src/filesystem/std-dir.cc to here. Change
	path to dir-common.h.
	* src/c++17/fs_ops.cc: Move src/filesystem/std-ops.cc to here. Change
	path to ops-common.h. Disable -Wunused-parameter warnings.
	(internal_file_clock): Define unconditionally.
	[!_GLIBCXX_HAVE_SYS_STAT_H] (internal_file_clock::from_stat): Do not
	define.
	(do_copy_file, do_space): Move definitions to ops.common.h.
	(copy, file_size, hard_link_count, last_write_time, space): Only
	perform operation when _GLIBCXX_HAVE_SYS_STAT_H is defined, otherwise
	report an error.
	(last_write_time, read_symlink): Remove unused attributes from
	parameters.
	* src/filesystem/Makefile.am: Remove C++17 filesystem sources.
	* src/filesystem/Makefile.in: Regenerate.
	* src/filesystem/cow-std-dir.cc: Move to src/c++17/cow-fs_dir.cc.
	* src/filesystem/cow-std-ops.cc: Move to src/c++17/cow-fs_ops.cc.
	* src/filesystem/std-dir.cc: Move to src/c++17/fs_dir.cc.
	* src/filesystem/std-ops.cc: Move to src/c++17/fs_ops.cc.
	* src/filesystem/dir-common.h [!_GLIBCXX_HAVE_DIRENT_H]: Define
	dummy types and functions instead of using #error.
	* src/filesystem/dir.cc [!_GLIBCXX_HAVE_DIRENT_H]: Use #error.
	* src/filesystem/ops-common.h [!_GLIBCXX_USE_LSTAT] (lstat): Define
	in terms of stat.
	[!_GLIBCXX_HAVE_UNISTD_H]: Define dummy types and functions.
	(do_copy_file, do_space): Move definitions here from std-ops.cc.
	* src/filesystem/ops.cc: Adjust calls to do_copy_file and do_space
	to account for new namespace.
	* testsuite/27_io/filesystem/directory_entry/86597.cc: Remove
	-lstdc++fs from dg-options.
	* testsuite/27_io/filesystem/directory_entry/lwg3171.cc: Likewise.
	* testsuite/27_io/filesystem/file_status/1.cc: Likewise.
	* testsuite/27_io/filesystem/filesystem_error/cons.cc: Likewise.
	* testsuite/27_io/filesystem/filesystem_error/copy.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/directory_iterator.cc:
	Likewise.
	* testsuite/27_io/filesystem/iterators/pop.cc: Likewise.
	* testsuite/27_io/filesystem/iterators/recursive_directory_iterator.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/absolute.cc: Likewise.
	* testsuite/27_io/filesystem/operations/canonical.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy.cc: Likewise.
	* testsuite/27_io/filesystem/operations/copy_file.cc: Likewise.
	* testsuite/27_io/filesystem/operations/create_directories.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/create_directory.cc: Likewise.
	* testsuite/27_io/filesystem/operations/create_symlink.cc: Likewise.
	* testsuite/27_io/filesystem/operations/current_path.cc: Likewise.
	* testsuite/27_io/filesystem/operations/equivalent.cc: Likewise.
	* testsuite/27_io/filesystem/operations/exists.cc: Likewise.
	* testsuite/27_io/filesystem/operations/file_size.cc: Likewise.
	* testsuite/27_io/filesystem/operations/is_empty.cc: Likewise.
	* testsuite/27_io/filesystem/operations/last_write_time.cc: Likewise.
	* testsuite/27_io/filesystem/operations/permissions.cc: Likewise.
	* testsuite/27_io/filesystem/operations/proximate.cc: Likewise.
	* testsuite/27_io/filesystem/operations/read_symlink.cc: Likewise.
	* testsuite/27_io/filesystem/operations/relative.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove.cc: Likewise.
	* testsuite/27_io/filesystem/operations/remove_all.cc: Likewise.
	* testsuite/27_io/filesystem/operations/space.cc: Likewise.
	* testsuite/27_io/filesystem/operations/status.cc: Likewise.
	* testsuite/27_io/filesystem/operations/symlink_status.cc: Likewise.
	* testsuite/27_io/filesystem/operations/temp_directory_path.cc:
	Likewise.
	* testsuite/27_io/filesystem/operations/weakly_canonical.cc: Likewise.


	PR libstdc++/86756
	* config/abi/pre/gnu.ver (GLIBCXX_3.4): Make various patterns for
	typeinfo and vtables less greedy.
	(GLIBCXX_3.4.26): Export symbols for std::filesystem::path.
	* src/c++17/Makefile.am: Add fs_path.cc and cow-fs_path.cc.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/cow-fs_path.cc: Move src/filesystem/cow-std-path.cc to
	here, and change name of included file.
	* src/c++17/fs_path.cc: Move src/filesystem/std-path.cc to here.
	* src/filesystem/Makefile.am: Remove std-path.cc and cow-std-path.cc
	from sources.
	* src/filesystem/Makefile.in: Regenerate.
	* src/filesystem/cow-std-path.cc: Move to src/c++17/cow-fs_path.cc.
	* src/filesystem/std-path.cc: Move to src/c++17/fs_path.cc.
	* testsuite/27_io/filesystem/path/append/path.cc: Remove -lstdc++fs
	from dg-options and remove dg-require-filesystem-ts.
	* testsuite/27_io/filesystem/path/append/source.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/assign.cc: Likewise.
	* testsuite/27_io/filesystem/path/assign/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/compare.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/lwg2936.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/compare/strings.cc: Likewise.
	* testsuite/27_io/filesystem/path/concat/path.cc: Likewise.
	* testsuite/27_io/filesystem/path/concat/strings.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/80762.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/copy.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/default.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/format.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/locale.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/range.cc: Likewise.
	* testsuite/27_io/filesystem/path/construct/string_view.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/extension.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/filename.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/parent_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/relative_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_name.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/root_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/decompose/stem.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/normal.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/normal2.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/proximate.cc: Likewise.
	* testsuite/27_io/filesystem/path/generation/relative.cc: Likewise.
	* testsuite/27_io/filesystem/path/generic/generic_string.cc: Likewise.
	* testsuite/27_io/filesystem/path/itr/components.cc: Likewise.
	* testsuite/27_io/filesystem/path/itr/traversal.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/clear.cc: Likewise.
	* testsuite/27_io/filesystem/path/modifiers/make_preferred.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/remove_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_extension.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/replace_filename.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/modifiers/swap.cc: Likewise.
	* testsuite/27_io/filesystem/path/native/string.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/append.cc: Likewise.
	* testsuite/27_io/filesystem/path/nonmember/hash_value.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/empty.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_extension.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_filename.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_parent_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_relative_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_directory.cc:
	Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_name.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_root_path.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/has_stem.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/is_absolute.cc: Likewise.
	* testsuite/27_io/filesystem/path/query/is_relative.cc: Likewise.

	PR libstdc++/87431
	* include/std/variant (_Variant_storage<true, _Types...>::_M_valid):
	Check is_trivially_copyable instead of is_scalar.
	(variant::emplace<N, Args>(Args&&...)): If construction of the new
	contained value can throw and its type is trivially copyable then
	construct into a temporary variant and move from it, to provide the
	strong exception safety guarantee.
	(variant::emplace<N, U, Args>(initializer_list<U>, Args&&...)):
	Likewise.
	* testsuite/20_util/variant/87431.cc: New test.
	* testsuite/20_util/variant/run.cc: Adjust test so that throwing
	conversion causes valueless state.

	PR libstdc++/88607
	* testsuite/17_intro/headers/c++1998/charset.cc: New test.
	* testsuite/17_intro/headers/c++2011/charset.cc: New test.
	* testsuite/17_intro/headers/c++2014/charset.cc: New test.
	* testsuite/17_intro/headers/c++2017/charset.cc: New test.
	* testsuite/17_intro/headers/c++2020/charset.cc: New test.

2019-01-05  Jonathan Wakely  <jwakely@redhat.com>

	* include/bits/fs_fwd.h (__file_clock): Define new clock.
	(file_time_type): Redefine in terms of __file_clock.
	* src/filesystem/ops-common.h (file_time): Add FIXME comment about
	overflow.
	* src/filesystem/std-ops.cc (is_set(perm_options, perm_options)): Give
	internal linkage.
	(internal_file_lock): New helper type for accessing __file_clock.
	(do_copy_file): Use internal_file_lock to convert system time to
	file_time_type.
	(last_write_time(const path&, error_code&)): Likewise.
	(last_write_time(const path&, file_time_type, error_code&)): Likewise.

2019-01-04  Jonathan Wakely  <jwakely@redhat.com>

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.21): Make patterns less greedy
	for const member functions of std::basic_string.
	(GLIBCXX_3.4.26): Export member functions of std::basic_string added
	in C++17.
	* include/bits/basic_string.h (basic_string(__sv_wrapper, const A&)):
	Make non-standard constructor private.
	[!_GLIBCXX_USE_CXX11_ABI] (basic_string(__sv_wrapper, const A&)):
	Likewise.
	* include/bits/basic_string.tcc (std::string, std::wstring): Declare
	explicit instantiations for C++17 as well as earlier dialects.
	* src/c++17/Makefile.am: Add new source files.
	* src/c++17/Makefile.in: Regenerate.
	* src/c++17/cow-string-inst.cc: New file defining explicit
	instantiations for basic_string member functions added in C++17.
	* src/c++17/string-inst.cc: Likewise.

	* config/abi/pre/gnu.ver (GLIBCXX_3.4.26): Export allocator-extended
	copy/move constructors for old std::basic_string.
	* include/bits/basic_string.h [!_GLIBCXX_USE_CXX11_ABI]
	(basic_string::reference, basic_string::const_reference): Define
	as plain references for C++11 and later.
	(basic_string::basic_string()): Put constructor body outside
	preprocessor conditional groups.
	(basic_string::basic_string(basic_string&&)): Move _Alloc_hider
	instead of copying it.
	(basic_string::basic_string(const basic_string&, const _Alloc&)):
	Define.
	(basic_string::basic_string(basic_string&&, const _Alloc&)):
	Define.
	* include/bits/fs_path.h [!_GLIBCXX_USE_CXX11_ABI]: Remove special
	cases for old basic_string.
	* testsuite/21_strings/basic_string/cons/char/8.cc: Test
	allocator-extended constructors unconditionally. Add extra members to
	allocator type when using old string ABI.
	* testsuite/21_strings/basic_string/allocator/71964.cc: Enable test
	for old string ABI.
	* testsuite/21_strings/basic_string/cons/wchar_t/8.cc: Likewise.

	* testsuite/23_containers/list/61347.cc: Avoid spurious failure when
	-fno-inline added to test flags.

	* testsuite/21_strings/basic_string/requirements/
	explicit_instantiation/debug.cc: Remove XFAIL for old ABI.

	* testsuite/27_io/filesystem/filesystem_error/copy.cc: Fix static
	assertion failures with old std::string ABI.

	* include/bits/fs_path.h (path::_List::erase): Replace both overloads
	with ...
	(path::pop_back(), path::_M_erase_from(const_iterator)): New member
	functions that will only erase elements at the end.
	* src/filesystem/std-path.cc (path::_List::_Impl::pop_back()): Define.
	(path::_List::_Impl::_M_erase_from(const_iterator)): Define.
	(path::_List::operator=(const _List&)): Use _M_erase_from(p) instead
	of erase(p, end()).
	(path::_List::pop_back()): Define.
	(path::_List::_M_erase_from(const_iterator)): Define.
	(path::operator/=(const path&)): Use pop_back to remove last component
	and _M_erase_from to remove multiple components.
	(path::_M_append(basic_string_view<value_type>)): Likewise.
	(path::operator+=(const path&)): Likewise.
	(path::_M_concat(basic_string_view<value_type>)): Likewise.
	(path::remove_filename()): Likewise.
	(path::lexically_normal()): Use _List::_Impl iterators instead of
	path::iterator. Use pop_back to remove components from the end. Clear
	trailing filename, instead of using erase(const_iterator) to remove
	a non-final component.
	* testsuite/27_io/filesystem/path/generation/normal.cc: Test
	additional cases.
	* testsuite/27_io/filesystem/path/generation/normal2.cc: New test.

	* src/filesystem/std-path.cc (path::operator+=(const path&)): Fix
	incorrect treatment of empty filename after trailing slash.
	* testsuite/27_io/filesystem/path/concat/path.cc: Test problem case.

	* testsuite/21_strings/basic_string/modifiers/assign/char/
	move_assign_optim.cc: Avoid spurious failure when -fno-inline added
	to test flags.
	* testsuite/21_strings/basic_string/modifiers/assign/wchar_t/
	move_assign_optim.cc: Likewise.

2019-01-03  Jonathan Wakely  <jwakely@redhat.com>
	    Jakub Jelinek  <jakub@redhat.com>

	PR libstdc++/88607
	* include/experimental/memory: Replace UTF-8 quote characters.
	* include/std/future: Replace UTF-8 "em dash" characters.

2019-01-03  Jonathan Wakely  <jwakely@redhat.com>

	PR libstdc++/88607
	* include/bits/forward_list.h: Replace UTF-8 "ligature fi" character.
	* include/debug/forward_list: Likewise.
	* include/experimental/bits/shared_ptr.h: Remove UTF-8 "section sign"
	character.
	* include/experimental/chrono: Likewise.
	* include/experimental/functional: Likewise.
	* include/experimental/ratio: Likewise.
	* include/experimental/system_error: Likewise.
	* include/experimental/tuple: Likewise.
	* include/experimental/type_traits: Likewise.
	* include/parallel/workstealing.h: Replace UTF-8 "en dash" character.
	* include/parallel/multiseq_selection.h: Likewise.

	PR libstdc++/88681
	* config/abi/pre/gnu.ver: Add missing exports.
	* testsuite/22_locale/collate_byname/88681.cc: New test.
	* testsuite/22_locale/time_get/get/char/88681.cc: New test.
	* testsuite/22_locale/time_get/get/wchar_t/88681.cc: New test.

2019-01-02  Jonathan Wakely  <jwakely@redhat.com>

	* testsuite/23_containers/map/cons/deduction.cc: Test deduction from
	initializer_list<value_type> and from input iterator ranges.
	* testsuite/23_containers/multimap/cons/deduction.cc: Likewise.

	* testsuite/experimental/string_view/element_access/char/empty.cc:
	Fix year range in copyright header.

2019-01-02  Joel Brobecker  <brobecker@adacore.com>

	* testsuite/21_strings/basic_string_view/element_access/char/empty.cc:
	Fix year range in copyright header.

2019-01-01  Jakub Jelinek  <jakub@redhat.com>

	Update copyright years.

Copyright (C) 2019 Free Software Foundation, Inc.

Copying and distribution of this file, with or without modification,
are permitted in any medium without royalty provided the copyright
notice and this notice are preserved.
