{"id":2226780,"url":"http://patchwork.ozlabs.org/api/patches/2226780/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhup55wx16.gcc.gcc-TEST.tkaminsk.85.1.9@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":"2026-04-22T18:49:46","name":"[v1,09/10] Apply non-cv for all standards, add negative tests for static asserts.","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"225d8a7f9d6f3becd0de731a49ce5bbe9fd441c7","submitter":{"id":93223,"url":"http://patchwork.ozlabs.org/api/people/93223/?format=json","name":"tkaminsk via Sourceware Forge","email":"forge-bot+tkaminsk@forge-stage.sourceware.org"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/gcc/patch/bmm.hhup55wx16.gcc.gcc-TEST.tkaminsk.85.1.9@forge-stage.sourceware.org/mbox/","series":[{"id":501094,"url":"http://patchwork.ozlabs.org/api/series/501094/?format=json","web_url":"http://patchwork.ozlabs.org/project/gcc/list/?series=501094","date":"2026-04-22T18:49:39","name":"WIP: libstdc++: add support for cv-qualified types in atomic_ref (P3323R1)","version":1,"mbox":"http://patchwork.ozlabs.org/series/501094/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2226780/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2226780/checks/","tags":{},"related":[],"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":"tkaminsk via Sourceware Forge\n ","Date":"Wed, 22 Apr 2026 18:49:46 +0000","Subject":"[PATCH v1 09/10] Apply non-cv for all standards, add negative tests\n for static asserts.","MIME-Version":"1.0","Content-Type":"text/plain; charset=UTF-8","Content-Transfer-Encoding":"8bit","To":"gcc-patches mailing list ","Message-ID":"\n ","X-Mailer":"batrachomyomachia","X-Pull-Request-Organization":"gcc","X-Pull-Request-Repository":"gcc-TEST","X-Pull-Request":"https://forge.sourceware.org/gcc/gcc-TEST/pulls/85","References":"\n ","In-Reply-To":"\n ","X-Patch-URL":"\n https://forge.sourceware.org/tkaminsk/gcc/commit/1da54a341fbb1fc0393e526a4978c82ae2149b8f","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 ,\n tkaminsk@gcc.gnu.org","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"},"content":"From: Tomasz Kamiński \n\n---\n libstdc++-v3/include/std/atomic | 3 +-\n .../atomic/requirements/types_neg.cc | 4 ++-\n .../29_atomics/atomic_ref/requirements_neg.cc | 34 +++++++++++++++++++\n 3 files changed, 39 insertions(+), 2 deletions(-)\n create mode 100644 libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements_neg.cc","diff":"diff --git a/libstdc++-v3/include/std/atomic b/libstdc++-v3/include/std/atomic\nindex cb94cb5e7ca2..17b4e61b3319 100644\n--- a/libstdc++-v3/include/std/atomic\n+++ b/libstdc++-v3/include/std/atomic\n@@ -216,13 +216,14 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n \n static_assert(sizeof(_Tp) > 0,\n \t\t \"Incomplete or zero-sized types are not supported\");\n+ static_assert(is_same_v<_Tp, remove_cv_t<_Tp>>,\n+\t\t \"cv-qualified types are not supported\");\n \n #if __cplusplus > 201703L\n static_assert(is_copy_constructible_v<_Tp>);\n static_assert(is_move_constructible_v<_Tp>);\n static_assert(is_copy_assignable_v<_Tp>);\n static_assert(is_move_assignable_v<_Tp>);\n- static_assert(is_same_v<_Tp, remove_cv_t<_Tp>>);\n #endif\n \n public:\ndiff --git a/libstdc++-v3/testsuite/29_atomics/atomic/requirements/types_neg.cc b/libstdc++-v3/testsuite/29_atomics/atomic/requirements/types_neg.cc\nindex cfe44d255ca2..b9105481006f 100644\n--- a/libstdc++-v3/testsuite/29_atomics/atomic/requirements/types_neg.cc\n+++ b/libstdc++-v3/testsuite/29_atomics/atomic/requirements/types_neg.cc\n@@ -19,7 +19,9 @@\n \n #include \n \n-std::atomic a; // { dg-error \"here\" }\n+std::atomic ca; // { dg-error \"here\" }\n+std::atomic va; // { dg-error \"here\" } \n+std::atomic cva; // { dg-error \"here\" } \n // { dg-error \"assignment to read-only type\" \"\" { target *-*-* } 0 }\n \n struct MoveOnly\ndiff --git a/libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements_neg.cc b/libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements_neg.cc\nnew file mode 100644\nindex 000000000000..9aa4123a0654\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/29_atomics/atomic_ref/requirements_neg.cc\n@@ -0,0 +1,34 @@\n+// { dg-do compile { target c++20 } }\n+\n+#include \n+\n+template\n+struct NonTrivial\n+{\n+ NonTrivial() = default;\n+ NonTrivial(NonTrivial const&) { }; \n+};\n+\n+template\n+NonTrivial ntv;\n+\n+std::atomic_ref> nt(ntv<0>); // { dg-error \"here\" }\n+std::atomic_ref> cnt(ntv<1>); // { dg-error \"here\" }\n+std::atomic_ref> vnt(ntv<2>); // { dg-error \"here\" }\n+std::atomic_ref> cvnt(ntv<3>); // { dg-error \"here\" }\n+\n+template\n+struct NonLockFree\n+{\n+ char c[1024 + N];\n+};\n+\n+template\n+NonLockFree nlfv;\n+\n+std::atomic_ref> nlf(nlfv<0>);\n+std::atomic_ref> cnlf(nlfv<1>);\n+std::atomic_ref> vnlf(nlfv<2>); // { dg-error \"here\" }\n+std::atomic_ref> cvnlf(nlfv<3>); // { dg-error \"here\" }\n+\n+// { dg-error \"static assertion failed\" \"\" { target *-*-* } 0 }\n","prefixes":["v1","09/10"]}