libstdc++-v3/ChangeLog

   1 2020-02-05  Jonathan Wakely  <jwakely@redhat.com>
   2
   3         * include/bits/iterator_concepts.h (iter_reference_t)
   4         (iter_rvalue_reference_t, iter_common_reference_t, indirect_result_t):
   5         Remove workarounds for PR c++/67704.
   6         * testsuite/24_iterators/aliases.cc: New test.
   7
   8 2020-02-05  Patrick Palka  <ppalka@redhat.com>
   9
  10         * include/bits/stl_iterator.h (move_iterator::move_iterator): Move __i
  11         when initializing _M_current.
  12         (move_iterator::base): Split into two overloads differing in
  13         ref-qualifiers as in P1207R4 for C++20.
  14
  15 2020-02-04  Jonathan Wakely  <jwakely@redhat.com>
  16
  17         * include/std/functional (_GLIBCXX_NOT_FN_CALL_OP): Un-define after
  18         use.
  19
  20         PR libstdc++/93562
  21         * include/bits/unique_ptr.h (__uniq_ptr_impl::swap): Define.
  22         (unique_ptr::swap, unique_ptr<T[], D>::swap): Call it.
  23         * testsuite/20_util/unique_ptr/modifiers/93562.cc: New test.
  24
  25 2020-02-01  Andrew Burgess  <andrew.burgess@embecosm.com>
  26
  27         * configure: Regenerate.
  28
  29 2020-01-31  Patrick Palka  <ppalka@redhat.com>
  30
  31         * testsuite/24_iterators/range_operations/distance.cc: Do not assume
  32         test_range::end() returns the same type as test_range::begin().
  33         * testsuite/24_iterators/range_operations/next.cc: Likewise.
  34         * testsuite/24_iterators/range_operations/prev.cc: Likewise.
  35         * testsuite/util/testsuite_iterators.h (__gnu_test::test_range::end):
  36         Always return a sentinel<I>.
  37
  38 2020-01-29  Jonathan Wakely  <jwakely@redhat.com>
  39
  40         PR libstdc++/92895
  41         * include/std/stop_token (stop_token::stop_possible()): Call new
  42         _M_stop_possible() function.
  43         (stop_token::stop_requested()): Do not use stop_possible().
  44         (stop_token::binary_semaphore): New class, as temporary stand-in for
  45         std::binary_semaphore.
  46         (stop_token::_Stop_cb::_M_callback): Add noexcept to type.
  47         (stop_token::_Stop_cb::_M_destroyed, stop_token::_Stop_cb::_M_done):
  48         New data members for symchronization with stop_callback destruction.
  49         (stop_token::_Stop_cb::_Stop_cb): Make non-template.
  50         (stop_token::_Stop_cb::_M_linked, stop_token::_Stop_cb::_S_execute):
  51         Remove.
  52         (stop_token::_Stop_cb::_M_run): New member function.
  53         (stop_token::_Stop_state::_M_stopped, stop_token::_Stop_state::_M_mtx):
  54         Remove.
  55         (stop_token::_Stop_state::_M_owners): New data member to track
  56         reference count for ownership.
  57         (stop_token::_Stop_state::_M_value): New data member combining a
  58         spinlock, the stop requested flag, and the reference count for
  59         associated stop_source objects.
  60         (stop_token::_Stop_state::_M_requester): New data member for
  61         synchronization with stop_callback destruction.
  62         (stop_token::_Stop_state::_M_stop_possible()): New member function.
  63         (stop_token::_Stop_state::_M_stop_requested()): Inspect relevant bit
  64         of _M_value.
  65         (stop_token::_Stop_state::_M_add_owner)
  66         (stop_token::_Stop_state::_M_release_ownership)
  67         (stop_token::_Stop_state::_M_add_ssrc)
  68         (stop_token::_Stop_state::_M_sub_ssrc): New member functions for
  69         updating reference counts.
  70         (stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
  71         (stop_token::_Stop_state::_M_lock, stop_token::_Stop_state::_M_unlock)
  72         (stop_token::_Stop_state::_M_try_lock)
  73         (stop_token::_Stop_state::_M_try_lock_and_stop)
  74         (stop_token::_Stop_state::_M_do_try_lock): New member functions for
  75         managing spinlock.
  76         (stop_token::_Stop_state::_M_request_stop): Use atomic operations to
  77         read and update state. Release lock while running callbacks. Use new
  78         data members to synchronize with callback destruction.
  79         (stop_token::_Stop_state::_M_remove_callback): Likewise.
  80         (stop_token::_Stop_state::_M_register_callback): Use atomic operations
  81         to read and update state.
  82         (stop_token::_Stop_state_ref): Handle type to manage _Stop_state,
  83         replacing shared_ptr.
  84         (stop_source::stop_source(const stop_source&)): Update reference count.
  85         (stop_source::operator=(const stop_source&)): Likewise.
  86         (stop_source::~stop_source()): Likewise.
  87         (stop_source::stop_source(stop_source&&)): Define as defaulted.
  88         (stop_source::operator=(stop_source&&)): Establish postcondition on
  89         parameter.
  90         (stop_callback): Enforce preconditions on template parameter. Replace
  91         base class with data member of new _Cb_impl type.
  92         (stop_callback::stop_callback(const stop_token&, Cb&&))
  93         (stop_callback::stop_callback(stop_token&&, Cb&&)): Fix TOCTTOU race.
  94         (stop_callback::_Cb_impl): New type wrapping _Callback member and
  95         defining the _S_execute member function.
  96         * testsuite/30_threads/stop_token/stop_callback/deadlock-mt.cc: New
  97         test.
  98         * testsuite/30_threads/stop_token/stop_callback/deadlock.cc: New test.
  99         * testsuite/30_threads/stop_token/stop_callback/destroy.cc: New test.
 100         * testsuite/30_threads/stop_token/stop_callback/destructible_neg.cc:
 101         New test.
 102         * testsuite/30_threads/stop_token/stop_callback/invocable_neg.cc: New
 103         test.
 104         * testsuite/30_threads/stop_token/stop_callback/invoke.cc: New test.
 105         * testsuite/30_threads/stop_token/stop_source/assign.cc: New test.
 106         * testsuite/30_threads/stop_token/stop_token/stop_possible.cc: New
 107         test.
 108
 109         * libsupc++/compare (__detail::__3way_builtin_ptr_cmp): Use
 110         three_way_comparable_with.
 111         (__detail::__3way_cmp_with): Remove workaround for fixed bug.
 112         (compare_three_way::operator()): Remove redundant constraint from
 113         requires-clause.
 114         (__detail::_Synth3way::operator()): Use three_way_comparable_with
 115         instead of workaround.
 116         * testsuite/18_support/comparisons/object/93479.cc: Prune extra
 117         output due to simplified constraints on compare_three_way::operator().
 118
 119         PR libstdc++/93479
 120         * libsupc++/compare (__3way_builtin_ptr_cmp): Require <=> to be valid.
 121         * testsuite/18_support/comparisons/object/93479.cc: New test.
 122
 123         * testsuite/std/ranges/access/end.cc: Do not assume test_range::end()
 124         returns the same type as test_range::begin(). Add comments.
 125         * testsuite/std/ranges/access/rbegin.cc: Likewise.
 126         * testsuite/std/ranges/access/rend.cc: Likewise.
 127         * testsuite/std/ranges/range.cc: Do not assume the sentinel for
 128         test_range is the same as its iterator type.
 129         * testsuite/util/testsuite_iterators.h (test_range::sentinel): Add
 130         operator- overloads to satisfy sized_sentinel_for when the iterator
 131         satisfies random_access_iterator.
 132
 133 2020-01-28  Jonathan Wakely  <jwakely@redhat.com>
 134
 135         PR libstdc++/93470
 136         * include/bits/refwrap.h (reference_wrapper::operator()): Restrict
 137         static assertion to object types.
 138
 139         PR libstdc++/93325
 140         * acinclude.m4 (GLIBCXX_ENABLE_LIBSTDCXX_TIME): Use AC_SEARCH_LIBS for
 141         clock_gettime instead of explicit glibc version check.
 142         * configure: Regenerate.
 143
 144 2020-01-28  Martin Liska  <mliska@suse.cz>
 145
 146         PR libstdc++/93478
 147         * include/std/atomic: Fix typo.
 148         * include/std/optional: Likewise.
 149
 150 2020-01-27  Andrew Burgess  <andrew.burgess@embecosm.com>
 151
 152         * configure: Regenerate.
 153
 154 2020-01-27  Jonathan Wakely  <jwakely@redhat.com>
 155
 156         PR libstdc++/93426
 157         * include/std/span (span): Fix deduction guide.
 158         * testsuite/23_containers/span/deduction.cc: New test.
 159
 160 2020-01-24  Jonathan Wakely  <jwakely@redhat.com>
 161
 162         * libsupc++/compare (__cmp_cat::_Eq): Remove enumeration type.
 163         (__cmp_cat::_Ord::equivalent): Add enumerator.
 164         (__cmp_cat::_Ord::_Less, __cmp_cat::_Ord::_Greater): Rename to less
 165         and greater.
 166         (partial_ordering, weak_ordering, strong_ordering): Remove
 167         constructors taking __cmp_cat::_Eq parameters. Use renamed
 168         enumerators.
 169
 170 2020-01-24  Maciej W. Rozycki  <macro@wdc.com>
 171
 172         * acinclude.m4: Handle `--with-toolexeclibdir='.
 173         * Makefile.in: Regenerate.
 174         * aclocal.m4: Regenerate.
 175         * configure: Regenerate.
 176         * doc/Makefile.in: Regenerate.
 177         * include/Makefile.in: Regenerate.
 178         * libsupc++/Makefile.in: Regenerate.
 179         * po/Makefile.in: Regenerate.
 180         * python/Makefile.in: Regenerate.
 181         * src/Makefile.in: Regenerate.
 182         * src/c++11/Makefile.in: Regenerate.
 183         * src/c++17/Makefile.in: Regenerate.
 184         * src/c++98/Makefile.in: Regenerate.
 185         * src/filesystem/Makefile.in: Regenerate.
 186         * testsuite/Makefile.in: Regenerate.
 187
 188 2020-01-23  Alexandre Oliva <oliva@adacore.com>
 189
 190         * crossconfig.m4 (GLIBCXX_CHECK_MATH_DECL): Reject macros.
 191         * configure: Rebuild.
 192
 193         * testsuite/27_io/fpos/mbstate_t/1.cc: Zero-init mbstate_t.
 194
 195 2020-01-23  Jonathan Wakely  <jwakely@redhat.com>
 196
 197         PR libstdc++/91947
 198         * include/Makefile.am (${host_builddir}/largefile-config.h): Simplify
 199         rule.
 200         * include/Makefile.in: Regenerate.
 201
 202 2020-01-20  Jonathan Wakely  <jwakely@redhat.com>
 203
 204         * doc/xml/faq.xml: Fix grammar.
 205         * doc/xml/manual/appendix_contributing.xml: Improve instructions.
 206         * doc/xml/manual/spine.xml: Update copyright years.
 207         * doc/html/*: Regenerate.
 208
 209 2020-01-19  Eric S. Raymond <esr@thyrsus.com>
 210
 211         * doc/xml/faq.xml: Update for SVN -> Git transition.
 212         * doc/xml/manual/appendix_contributing.xml: Likewise.
 213         * doc/xml/manual/status_cxx1998.xml: Likewise.
 214         * doc/xml/manual/status_cxx2011.xml: Likewise.
 215         * doc/xml/manual/status_cxx2014.xml: Likewise.
 216         * doc/xml/manual/status_cxx2017.xml: Likewise.
 217         * doc/xml/manual/status_cxx2020.xml: Likewise.
 218         * doc/xml/manual/status_cxxtr1.xml: Likewise.
 219         * doc/xml/manual/status_cxxtr24733.xml: Likewise.
 220
 221 2020-01-18  Iain Sandoe  <iain@sandoe.co.uk>
 222
 223         * include/Makefile.am: Add coroutine to the std set.
 224         * include/Makefile.in: Regenerated.
 225         * include/std/coroutine: New file.
 226
 227 2020-01-17  Jonathan Wakely  <jwakely@redhat.com>
 228
 229         PR libstdc++/92376
 230         * include/bits/c++config: Only do PSTL config when the header is
 231         present, to fix freestanding.
 232         * libsupc++/new_opa.cc [!_GLIBCXX_HOSTED]: Declare allocation
 233         functions if they were detected by configure.
 234
 235 2020-01-16  Kai-Uwe Eckhardt  <kuehro@gmx.de>
 236             Matthew Bauer  <mjbauer95@gmail.com>
 237             Jonathan Wakely  <jwakely@redhat.com>
 238
 239         PR bootstrap/64271 (partial)
 240         * config/os/bsd/netbsd/ctype_base.h (ctype_base::mask): Change type
 241         to unsigned short.
 242         (ctype_base::alpha, ctype_base::digit, ctype_base::xdigit)
 243         (ctype_base::print, ctype_base::graph, ctype_base::alnum): Sync
 244         definitions with NetBSD upstream.
 245         (ctype_base::blank): Use _CTYPE_BL.
 246         * config/os/bsd/netbsd/ctype_configure_char.cc (_C_ctype_): Remove
 247         Declaration.
 248         (ctype<char>::classic_table): Use _C_ctype_tab_ instead of _C_ctype_.
 249         (ctype<char>::do_toupper, ctype<char>::do_tolower): Cast char
 250         parameters to unsigned char.
 251         * config/os/bsd/netbsd/ctype_inline.h (ctype<char>::is): Likewise.
 252
 253 2020-01-16  François Dumont  <fdumont@gcc.gnu.org>
 254
 255         PR libstdc++/91263
 256         * include/bits/hashtable.h (_Hashtable<>): Make _Equality<> friend.
 257         * include/bits/hashtable_policy.h: Include <bits/stl_algo.h>.
 258         (_Equality_base): Remove.
 259         (_Equality<>::_M_equal): Review implementation. Use
 260         std::is_permutation.
 261         * testsuite/23_containers/unordered_multiset/operators/1.cc
 262         (Hash, Equal, test02, test03): New.
 263         * testsuite/23_containers/unordered_set/operators/1.cc
 264         (Hash, Equal, test02, test03): New.
 265
 266 2020-01-15  Jonathan Wakely  <jwakely@redhat.com>
 267
 268         PR libstdc++/93267
 269         * include/bits/iterator_concepts.h (__max_diff_type, __max_size_type):
 270         Move here from <bits/range_access.h> and define using __int128 when
 271         available.
 272         (__is_integer_like, __is_signed_integer_like): Move here from
 273         <bits/range_access.h>.
 274         (weakly_incrementable): Use __is_signed_integer_like.
 275         * include/bits/range_access.h (__max_diff_type, __max_size_type)
 276         (__is_integer_like, __is_signed_integer_like): Move to
 277         <bits/iterator_concepts.h>.
 278         (__make_unsigned_like_t): Move here from <ranges>.
 279         * include/std/ranges (__make_unsigned_like_t): Move to
 280         <bits/range_access.h>.
 281         (iota_view): Replace using-directive with using-declarations.
 282         * testsuite/std/ranges/iota/93267.cc: New test.
 283         * testsuite/std/ranges/iota_view.cc: Move to new 'iota' sub-directory.
 284
 285 2020-01-13  Jonathan Wakely  <jwakely@redhat.com>
 286
 287         PR libstdc++/93244
 288         * include/bits/fs_path.h (path::generic_string<C,A>)
 289         [_GLIBCXX_FILESYSTEM_IS_WINDOWS]: Convert root-dir to forward-slash.
 290         * testsuite/27_io/filesystem/path/generic/generic_string.cc: Check
 291         root-dir is converted to forward slash in generic pathname.
 292         * testsuite/27_io/filesystem/path/generic/utf.cc: New test.
 293         * testsuite/27_io/filesystem/path/generic/wchar_t.cc: New test.
 294
 295         PR libstdc++/58605
 296         * include/bits/atomic_base.h (__cpp_lib_atomic_value_initialization):
 297         Define.
 298         (__atomic_flag_base, __atomic_base, __atomic_base<_PTp*>)
 299         (__atomic_float): Add default member initializer for C++20.
 300         * include/std/atomic (atomic): Likewise.
 301         (atomic::atomic()): Remove noexcept-specifier on default constructor.
 302         * include/std/version (__cpp_lib_atomic_value_initialization): Define.
 303         * testsuite/29_atomics/atomic/cons/assign_neg.cc: Adjust dg-error line
 304         number.
 305         * testsuite/29_atomics/atomic/cons/copy_neg.cc: Likewise.
 306         * testsuite/29_atomics/atomic/cons/value_init.cc: New test.
 307         * testsuite/29_atomics/atomic_flag/cons/value_init.cc: New test.
 308         * testsuite/29_atomics/atomic_flag/requirements/trivial.cc: Adjust
 309         expected result for is_trivially_default_constructible.
 310         * testsuite/29_atomics/atomic_float/requirements.cc: Likewise.
 311         * testsuite/29_atomics/atomic_float/value_init.cc: New test.
 312         * testsuite/29_atomics/atomic_integral/cons/assign_neg.cc: Likewise.
 313         * testsuite/29_atomics/atomic_integral/cons/copy_neg.cc: Likewise.
 314         * testsuite/29_atomics/atomic_integral/cons/value_init.cc
 315         * testsuite/29_atomics/atomic_integral/requirements/trivial.cc: Adjust
 316         expected results for is_trivially_default_constructible.
 317         * testsuite/util/testsuite_common_types.h (has_trivial_dtor): Add
 318         new test generator.
 319
 320 2020-01-10  Jonathan Wakely  <jwakely@redhat.com>
 321
 322         * testsuite/util/testsuite_iterators.h: Improve comment.
 323
 324         * testsuite/25_algorithms/equal/deque_iterators/1.cc: Don't use C++11
 325         initialization syntax.
 326
 327         PR libstdc++/92285
 328         * include/bits/streambuf_iterator.h (istreambuf_iterator): Make type
 329         of base class independent of __cplusplus value.
 330         [__cplusplus < 201103L] (istreambuf_iterator::reference): Override the
 331         type defined in the base class
 332         * testsuite/24_iterators/istreambuf_iterator/92285.cc: New test.
 333         * testsuite/24_iterators/istreambuf_iterator/requirements/
 334         base_classes.cc: Adjust expected base class for C++98.
 335
 336 2020-01-09  Olivier Hainque  <hainque@adacore.com>
 337
 338         * doc/xml/manual/appendix_contributing.xml: Document _C2
 339         as a reserved identifier, by VxWorks.
 340         * include/bits/stl_map.h: Rename _C2 template typenames as _Cmp2.
 341         * include/bits/stl_multimap.h: Likewise.
 342
 343 2020-01-09  Jonathan Wakely  <jwakely@redhat.com>
 344
 345         * include/ext/extptr_allocator.h (_ExtPtr_allocator::operator==)
 346         (_ExtPtr_allocator::operator!=): Add missing const qualifiers.
 347         * include/ext/pointer.h (readable_traits<_Pointer_adapter<S>>): Add
 348         partial specialization to disambiguate the two constrained
 349         specializations.
 350
 351         * include/experimental/type_traits (experimental::is_pod_v): Disable
 352         -Wdeprecated-declarations warnings around reference to std::is_pod.
 353         * include/std/type_traits (is_pod_v): Likewise.
 354         * testsuite/18_support/max_align_t/requirements/2.cc: Also check
 355         is_standard_layout and is_trivial. Do not check is_pod for C++20.
 356         * testsuite/20_util/is_pod/requirements/explicit_instantiation.cc:
 357         Add -Wno-deprecated for C++20.
 358         * testsuite/20_util/is_pod/requirements/typedefs.cc: Likewise.
 359         * testsuite/20_util/is_pod/value.cc: Likewise.
 360         * testsuite/experimental/type_traits/value.cc: Likewise.
 361
 362 2020-01-09  JeanHeyd "ThePhD" Meneide  <phdofthehouse@gmail.com>
 363
 364         * include/bits/c++config (_GLIBCXX20_DEPRECATED): Add new macro.
 365         * include/std/type_traits (is_pod, is_pod_v): Deprecate for C++20.
 366         * testuite/20_util/is_pod/deprecated-2a.cc: New test.
 367
 368 2020-01-09  Jonathan Wakely  <jwakely@redhat.com>
 369
 370         PR libstdc++/93205
 371         * include/bits/random.h (operator>>): Check stream operation succeeds.
 372         * include/bits/random.tcc (operator<<): Remove redundant __ostream_type
 373         typedefs.
 374         (operator>>): Remove redundant __istream_type typedefs. Check stream
 375         operations succeed.
 376         (__extract_params): New function to fill a vector from a stream.
 377         * testsuite/26_numerics/random/pr60037-neg.cc: Adjust dg-error line.
 378
 379         PR libstdc++/93208
 380         * config/abi/pre/gnu.ver: Add new exports.
 381         * include/std/memory_resource (memory_resource::~memory_resource()):
 382         Do not define inline.
 383         (monotonic_buffer_resource::~monotonic_buffer_resource()): Likewise.
 384         * src/c++17/memory_resource.cc (memory_resource::~memory_resource()):
 385         Define.
 386         (monotonic_buffer_resource::~monotonic_buffer_resource()): Define.
 387         * testsuite/20_util/monotonic_buffer_resource/93208.cc: New test.
 388
 389 2020-01-09  François Dumont  <fdumont@gcc.gnu.org>
 390
 391         PR libstdc++/92124
 392         * include/bits/hashtable.h (_Hashtable<>::__alloc_node_gen_t): New
 393         template alias.
 394         (_Hashtable<>::__fwd_value_for): New.
 395         (_Hashtable<>::_M_assign_elements<>): Remove _NodeGenerator template
 396         parameter.
 397         (_Hashtable<>::_M_assign<>): Add _Ht template parameter.
 398         (_Hashtable<>::operator=(const _Hashtable<>&)): Adapt.
 399         (_Hashtable<>::_M_move_assign): Adapt. Replace std::move_if_noexcept
 400         with std::move.
 401         (_Hashtable<>::_Hashtable(const _Hashtable&)): Adapt.
 402         (_Hashtable<>::_Hashtable(const _Hashtable&, const allocator_type&)):
 403         Adapt.
 404         (_Hashtable<>::_Hashtable(_Hashtable&&, const allocator_type&)):
 405         Adapt.
 406         * testsuite/23_containers/unordered_set/92124.cc: New.
 407
 408 2020-01-08  Jonathan Wakely  <jwakely@redhat.com>
 409
 410         PR libstdc++/93201
 411         * src/c++17/fs_ops.cc (do_remove_all): New function implementing more
 412         detailed error reporting for remove_all. Check result of recursive
 413         call before incrementing iterator.
 414         (remove_all(const path&), remove_all(const path&, error_code&)): Use
 415         do_remove_all.
 416         * src/filesystem/ops.cc (remove_all(const path&, error_code&)): Check
 417         result of recursive call before incrementing iterator.
 418         * testsuite/27_io/filesystem/operations/remove_all.cc: Check errors
 419         are reported correctly.
 420         * testsuite/experimental/filesystem/operations/remove_all.cc: Likewise.
 421
 422 2020-01-07  Thomas Rodgers  <trodgers@redhat.com>
 423
 424         * include/std/condition_variable
 425         (condition_variable_any::wait_on): Rename to match current draft
 426         standard.
 427         (condition_variable_any::wait_on_until): Likewise.
 428         (condition_variable_any::wait_on_for): Likewise.
 429         * testsuite/30_threads/condition_variable_any/stop_token/wait_on.cc:
 430         Adjust tests to account for renamed methods.
 431
 432 2020-01-07  François Dumont  <fdumont@gcc.gnu.org>
 433
 434         PR libstdc++/92124
 435         * include/bits/stl_tree.h
 436         (_Rb_tree<>::_M_move_assign(_Rb_tree&, false_type)): Replace
 437         std::move_if_noexcept by std::move.
 438         * testsuite/23_containers/map/92124.cc: New.
 439         * testsuite/23_containers/set/92124.cc: New.
 440
 441 2020-01-06  Jonathan Wakely  <jwakely@redhat.com>
 442
 443         * include/std/stop_token (stop_token): Remove operator!= (LWG 3254).
 444         (stop_source): Likewise (LWG 3362).
 445         * testsuite/30_threads/stop_token/stop_source.cc: Test equality
 446         comparisons.
 447
 448         * include/bits/stl_algobase.h (__is_byte_iter, __min_cmp)
 449         (lexicographical_compare_three_way): Do not depend on
 450         __cpp_lib_concepts.
 451         * include/std/version (__cpp_lib_three_way_comparison): Only define
 452         when __cpp_lib_concepts is defined.
 453         * libsupc++/compare (__cpp_lib_three_way_comparison): Likewise.
 454
 455 2020-01-03  Jonathan Wakely  <jwakely@redhat.com>
 456
 457         * include/bits/stl_algobase.h (lexicographical_compare_three_way):
 458         Only define four-argument overload when __cpp_lib_concepts is defined.
 459
 460 2020-01-01  John David Anglin  <danglin@gcc.gnu.org>
 461
 462         * config/abi/post/hppa-linux-gnu/baseline_symbols.txt: Update.
 463
 464 2020-01-01  Jakub Jelinek  <jakub@redhat.com>
 465
 466         Update copyright years.
 467 \f
 468 Copyright (C) 2020 Free Software Foundation, Inc.
 469
 470 Copying and distribution of this file, with or without modification,
 471 are permitted in any medium without royalty provided the copyright
 472 notice and this notice are preserved.