{"id":2226224,"url":"http://patchwork.ozlabs.org/api/covers/2226224/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhubfyz6j6.gcc.gcc-TEST.redi.22.1.0@forge-stage.sourceware.org/","project":{"id":17,"url":"http://patchwork.ozlabs.org/api/projects/17/?format=json","name":"GNU Compiler Collection","link_name":"gcc","list_id":"gcc-patches.gcc.gnu.org","list_email":"gcc-patches@gcc.gnu.org","web_url":null,"scm_url":null,"webscm_url":null,"list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"","list_archive_url":null,"date":"2026-04-22T10:32:44","name":"[v1,0/1] libstdc++: Make _GLIBCXX_NODISCARD work for C++11 and C++14","submitter":{"id":93210,"url":"http://patchwork.ozlabs.org/api/people/93210/?format=json","name":"Jonathan Wakely via Sourceware Forge","email":"forge-bot+redi@forge-stage.sourceware.org"},"mbox":"http://patchwork.ozlabs.org/project/gcc/cover/bmm.hhubfyz6j6.gcc.gcc-TEST.redi.22.1.0@forge-stage.sourceware.org/mbox/","series":[{"id":500975,"url":"http://patchwork.ozlabs.org/api/series/500975/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=500975","date":"2026-04-22T10:32:44","name":"libstdc++: Make _GLIBCXX_NODISCARD work for C++11 and C++14","version":1,"mbox":"http://patchwork.ozlabs.org/series/500975/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/covers/2226224/comments/","headers":{"Return-Path":"","X-Original-To":["incoming@patchwork.ozlabs.org","gcc-patches@gcc.gnu.org"],"Delivered-To":["patchwork-incoming@legolas.ozlabs.org","gcc-patches@gcc.gnu.org"],"Authentication-Results":["legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=gcc.gnu.org\n (client-ip=2620:52:6:3111::32; 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server2.sourceware.org","From":"Jonathan Wakely via Sourceware Forge\n ","Date":"Wed, 22 Apr 2026 10:32:44 +0000","Subject":"[PATCH v1 0/1] libstdc++: Make _GLIBCXX_NODISCARD work for C++11 and\n C++14","To":"gcc-patches mailing list ","Message-ID":"\n ","X-Mailer":"batrachomyomachia","X-Requested-Reviewer":"ppalka","X-Pull-Request-Organization":"gcc","X-Pull-Request-Repository":"gcc-TEST","X-Pull-Request":"https://forge.sourceware.org/gcc/gcc-TEST/pulls/22","X-BeenThere":"gcc-patches@gcc.gnu.org","X-Mailman-Version":"2.1.30","Precedence":"list","List-Id":"Gcc-patches mailing list ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Reply-To":"gcc-patches mailing list , redi@gcc.gnu.org","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"Hi gcc-patches mailing list,\nJonathan Wakely via Sourceware Forge has requested that the following forgejo pull request\nbe published on the mailing list.\n\nCreated on: 2024-11-14 12:23:40+00:00\nLatest update: 2025-08-13 03:23:39+00:00\nChanges: 0 changed files, 0 additions, 0 deletions\nHead revision: redi/gcc ref refs/pull/22/head commit 4f1ad2c3a2899c98506ef93912dd99219aef0b54\nBase revision: gcc/gcc-TEST ref trunk commit 9ede072ffafcde27d0e9fe76bb7ffacb4f48a2d6 r15-5236-g9ede072ffafcde\nMerge base: 9ede072ffafcde27d0e9fe76bb7ffacb4f48a2d6\nFull diff url: https://forge.sourceware.org/gcc/gcc-TEST/pulls/22.diff\nDiscussion: https://forge.sourceware.org/gcc/gcc-TEST/pulls/22\nRequested Reviewers: ppalka\n\nThe `_GLIBCXX_NODISCARD` macro only expands to `[[__nodiscard__]]` for C++17\nand later, but all supported compilers will allow us to use that for\nC++11 and C++14 too. Enable it for those older standards, to give\nimproved diagnostics for users of those older standards.\n\n```\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/c++config (_GLIBCXX_NODISCARD): Expand for C++11\n\tand C++14.\n\t* testsuite/22_locale/locale/cons/12438.cc: Adjust dg-warning to\n\texpect nodiscard warnings for C++11 and C++14 as well.\n\t* testsuite/22_locale/locale/operations/2.cc: Likewise.\n\t* testsuite/25_algorithms/equal/debug/1_neg.cc: Likewise.\n\t* testsuite/25_algorithms/equal/debug/2_neg.cc: Likewise.\n\t* testsuite/25_algorithms/equal/debug/3_neg.cc: Likewise.\n\t* testsuite/25_algorithms/find_first_of/concept_check_1.cc:\n\tLikewise.\n\t* testsuite/25_algorithms/is_permutation/2.cc: Likewise.\n\t* testsuite/25_algorithms/lexicographical_compare/71545.cc:\n\tLikewise.\n\t* testsuite/25_algorithms/lower_bound/33613.cc: Likewise.\n\t* testsuite/25_algorithms/lower_bound/debug/irreflexive.cc:\n\tLikewise.\n\t* testsuite/25_algorithms/lower_bound/debug/partitioned_neg.cc:\n\tLikewise.\n\t* testsuite/25_algorithms/lower_bound/debug/partitioned_pred_neg.cc: Likewise.\n\t* testsuite/25_algorithms/minmax/3.cc: Likewise.\n\t* testsuite/25_algorithms/search/78346.cc: Likewise.\n\t* testsuite/25_algorithms/search_n/58358.cc: Likewise.\n\t* testsuite/25_algorithms/unique/1.cc: Likewise.\n\t* testsuite/25_algorithms/unique/11480.cc: Likewise.\n\t* testsuite/25_algorithms/upper_bound/33613.cc: Likewise.\n\t* testsuite/25_algorithms/upper_bound/debug/partitioned_neg.cc:\n\tLikewise.\n\t* testsuite/25_algorithms/upper_bound/debug/partitioned_pred_neg.cc: Likewise.\n\t* testsuite/27_io/ios_base/types/fmtflags/bitmask_operators.cc:\n\tLikewise.\n\t* testsuite/27_io/ios_base/types/iostate/bitmask_operators.cc:\n\tLikewise.\n\t* testsuite/27_io/ios_base/types/openmode/bitmask_operators.cc:\n\tLikewise.\n\t* testsuite/ext/concept_checks.cc: Likewise.\n\t* testsuite/ext/is_heap/47709.cc: Likewise.\n\t* testsuite/ext/is_sorted/cxx0x.cc: Likewise.\n```\n\n\nChanged files:\n- M: libstdc++-v3/include/bits/c++config\n- M: libstdc++-v3/testsuite/22_locale/locale/cons/12438.cc\n- M: libstdc++-v3/testsuite/22_locale/locale/operations/2.cc\n- M: libstdc++-v3/testsuite/25_algorithms/equal/debug/1_neg.cc\n- M: libstdc++-v3/testsuite/25_algorithms/equal/debug/2_neg.cc\n- M: libstdc++-v3/testsuite/25_algorithms/equal/debug/3_neg.cc\n- M: libstdc++-v3/testsuite/25_algorithms/find_first_of/concept_check_1.cc\n- M: libstdc++-v3/testsuite/25_algorithms/is_permutation/2.cc\n- M: libstdc++-v3/testsuite/25_algorithms/lexicographical_compare/71545.cc\n- M: libstdc++-v3/testsuite/25_algorithms/lower_bound/33613.cc\n- M: libstdc++-v3/testsuite/25_algorithms/lower_bound/debug/irreflexive.cc\n- M: libstdc++-v3/testsuite/25_algorithms/lower_bound/debug/partitioned_neg.cc\n- M: libstdc++-v3/testsuite/25_algorithms/lower_bound/debug/partitioned_pred_neg.cc\n- M: libstdc++-v3/testsuite/25_algorithms/minmax/3.cc\n- M: libstdc++-v3/testsuite/25_algorithms/search/78346.cc\n- M: libstdc++-v3/testsuite/25_algorithms/search_n/58358.cc\n- M: libstdc++-v3/testsuite/25_algorithms/unique/1.cc\n- M: libstdc++-v3/testsuite/25_algorithms/unique/11480.cc\n- M: libstdc++-v3/testsuite/25_algorithms/upper_bound/33613.cc\n- M: libstdc++-v3/testsuite/25_algorithms/upper_bound/debug/partitioned_neg.cc\n- M: libstdc++-v3/testsuite/25_algorithms/upper_bound/debug/partitioned_pred_neg.cc\n- M: libstdc++-v3/testsuite/27_io/ios_base/types/fmtflags/bitmask_operators.cc\n- M: libstdc++-v3/testsuite/27_io/ios_base/types/iostate/bitmask_operators.cc\n- M: libstdc++-v3/testsuite/27_io/ios_base/types/openmode/bitmask_operators.cc\n- M: libstdc++-v3/testsuite/ext/concept_checks.cc\n- M: libstdc++-v3/testsuite/ext/is_heap/47709.cc\n- M: libstdc++-v3/testsuite/ext/is_sorted/cxx0x.cc\n\n\nJonathan Wakely (1):\n libstdc++: Make _GLIBCXX_NODISCARD work for C++11 and C++14\n\n libstdc++-v3/include/bits/c++config | 2 +-\n libstdc++-v3/testsuite/22_locale/locale/cons/12438.cc | 2 +-\n libstdc++-v3/testsuite/22_locale/locale/operations/2.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/equal/debug/1_neg.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/equal/debug/2_neg.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/equal/debug/3_neg.cc | 2 +-\n .../25_algorithms/find_first_of/concept_check_1.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/is_permutation/2.cc | 2 +-\n .../25_algorithms/lexicographical_compare/71545.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/lower_bound/33613.cc | 2 +-\n .../25_algorithms/lower_bound/debug/irreflexive.cc | 2 +-\n .../25_algorithms/lower_bound/debug/partitioned_neg.cc | 2 +-\n .../lower_bound/debug/partitioned_pred_neg.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/minmax/3.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/search/78346.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/search_n/58358.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/unique/1.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/unique/11480.cc | 2 +-\n libstdc++-v3/testsuite/25_algorithms/upper_bound/33613.cc | 2 +-\n .../25_algorithms/upper_bound/debug/partitioned_neg.cc | 2 +-\n .../upper_bound/debug/partitioned_pred_neg.cc | 2 +-\n .../27_io/ios_base/types/fmtflags/bitmask_operators.cc | 8 ++++----\n .../27_io/ios_base/types/iostate/bitmask_operators.cc | 8 ++++----\n .../27_io/ios_base/types/openmode/bitmask_operators.cc | 8 ++++----\n libstdc++-v3/testsuite/ext/concept_checks.cc | 8 ++++----\n libstdc++-v3/testsuite/ext/is_heap/47709.cc | 3 +--\n libstdc++-v3/testsuite/ext/is_sorted/cxx0x.cc | 3 +--\n 27 files changed, 39 insertions(+), 41 deletions(-)"}