[{"id":3680761,"web_url":"http://patchwork.ozlabs.org/comment/3680761/","msgid":"","list_archive_url":null,"date":"2025-09-24T13:52:48","subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","submitter":{"id":93223,"url":"http://patchwork.ozlabs.org/api/people/93223/","name":"tkaminsk via Sourceware Forge","email":"forge-bot+tkaminsk@forge-stage.sourceware.org"},"content":"This is continued as https://forge.sourceware.org/gcc/gcc-TEST/pulls/85.\n\n--\nhttps://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-2365","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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org; dmarc=none (p=none dis=none)\n header.from=forge-stage.sourceware.org","sourceware.org;\n spf=pass smtp.mailfrom=forge-stage.sourceware.org","server2.sourceware.org;\n arc=none smtp.remote-ip=38.145.34.39"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g16kk3PZLz1yGs\n\tfor ; Thu, 23 Apr 2026 04:12:14 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id 9CB304BC0541\n\tfor ; Wed, 22 Apr 2026 18:12:12 +0000 (GMT)","from forge-stage.sourceware.org (vm08.sourceware.org [38.145.34.39])\n by sourceware.org (Postfix) with ESMTPS id 110BD4BB5896\n for ; Wed, 22 Apr 2026 18:06:55 +0000 (GMT)","from forge-stage.sourceware.org (localhost [IPv6:::1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256)\n (No client certificate requested)\n by forge-stage.sourceware.org (Postfix) with ESMTPS id D84C3433DD\n for ; Wed, 22 Apr 2026 18:06:54 +0000 (UTC)"],"DKIM-Filter":["OpenDKIM Filter v2.11.0 sourceware.org 9CB304BC0541","OpenDKIM Filter v2.11.0 sourceware.org 110BD4BB5896"],"DMARC-Filter":"OpenDMARC Filter v1.4.2 sourceware.org 110BD4BB5896","ARC-Filter":"OpenARC Filter v1.0.0 sourceware.org 110BD4BB5896","ARC-Seal":"i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776881215; cv=none;\n b=ogy14XGlSzOV/jAnLaylIIC+RGY2gsv5/7BCgdNsJzZT4sqHdmBVg1qIJXmeQlaFyhoKZB2aw9LA6wqmC90UdAqVvbwa+JNa2B3+ShjI9wB2er9BHdCZ8Uo1kPly0chcEze611t+YYvG/dD1S02OsFXnocBLuZvgCMLSr/xaeSM=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776881215; c=relaxed/simple;\n bh=SyM5yZsa6JMIi3liWD/Dspw2srw48PcBXVsxG37EFnY=;\n h=Subject:From:To:Date:Message-ID:MIME-Version;\n b=QySGdH9RCoE31iGQG8X1rZyaZcePNYSBK0RiZewV+Vptvy8PsAuDsjX0yCKlaMIYaIWLwCASUOIhpyvoJ2gE8Z50i08YRVqJLnYnPmCopFgT2hXPI09UsLaUlSfqcQQy8fdyqsS69VXbHC4l5l6BWjtzFEVjUDSRuNUhiqGFlC8=","ARC-Authentication-Results":"i=1; server2.sourceware.org","Subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","From":"tkaminsk via Sourceware Forge\n ","To":"gcc-patches mailing list ","Date":"Wed, 24 Sep 2025 13:52:48 +0000","Message-ID":"\n ","In-Reply-To":"\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/42","X-Comment":"\n https://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-2365","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","MIME-Version":"1.0","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 ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3680766,"web_url":"http://patchwork.ozlabs.org/comment/3680766/","msgid":"","list_archive_url":null,"date":"2026-04-22T18:06:28","subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","submitter":{"id":93212,"url":"http://patchwork.ozlabs.org/api/people/93212/","name":"Lichenor Forgejo Bot via Sourceware Forge","email":"forge-bot+forge-bot@forge-stage.sourceware.org"},"content":"\nVersion 1 of this pull request has been stored. It includes the following commits:\n- libstdc++: add support for cv-qualified types in atomic_ref (P3323R1) - ed6c012d7290585f55872f690bee7b9e8f6bd1f7\n\n\n--\nhttps://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-5611","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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org; dmarc=none (p=none dis=none)\n header.from=forge-stage.sourceware.org","sourceware.org;\n spf=pass smtp.mailfrom=forge-stage.sourceware.org","server2.sourceware.org;\n arc=none smtp.remote-ip=38.145.34.39"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g16mB2FWLz1yGs\n\tfor ; Thu, 23 Apr 2026 04:13:30 +1000 (AEST)","from vm01.sourceware.org (localhost [127.0.0.1])\n\tby sourceware.org (Postfix) with ESMTP id 6D0854BC0570\n\tfor ; Wed, 22 Apr 2026 18:13:28 +0000 (GMT)","from forge-stage.sourceware.org (vm08.sourceware.org [38.145.34.39])\n by sourceware.org (Postfix) with ESMTPS id E35354B920AE\n for ; Wed, 22 Apr 2026 18:06:56 +0000 (GMT)","from forge-stage.sourceware.org (localhost [IPv6:::1])\n (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n key-exchange x25519 server-signature ECDSA (prime256v1) server-digest SHA256)\n (No client certificate requested)\n by forge-stage.sourceware.org (Postfix) with ESMTPS id 029C7433E1\n for ; Wed, 22 Apr 2026 18:06:55 +0000 (UTC)"],"DKIM-Filter":["OpenDKIM Filter v2.11.0 sourceware.org 6D0854BC0570","OpenDKIM Filter v2.11.0 sourceware.org E35354B920AE"],"DMARC-Filter":"OpenDMARC Filter v1.4.2 sourceware.org E35354B920AE","ARC-Filter":"OpenARC Filter v1.0.0 sourceware.org E35354B920AE","ARC-Seal":"i=1; a=rsa-sha256; d=sourceware.org; s=key; t=1776881217; cv=none;\n b=O9Au7Ow+2bzo4J4JDNxpiaSInRTuSUjbzL0Y0uWLLl3mPmMLUNjaT1FuJ5LLKJQYM1YvbzsG35aVBVU7943DOqe/+t2qkzfvvUaGuSf7cRBpkSIL7PMc/vUL1Pc1aT1t3dgeUpCQqdLm6ErajCJcPQ/o+ol8fX7GOOcAX2LDVKA=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776881217; c=relaxed/simple;\n bh=fOqgDmOVSnpISEMynlJG6n8y2S533MGkCIyG4zsoqUg=;\n h=Subject:From:To:Date:Message-ID:MIME-Version;\n b=h2BG9vyroYS/DFq9wBgrYyEGuvoxL6RHHUsLmB5QLJIGiixavqwc90WhZ3TajgaVTKmRTMDulc9AxkGW4ivcdUc6hdbZQ6XV6s1RqHlhGWnc14isXa3xz7AK6y57FgvBtBRlRjkM615Ty2/Sg62Go+Ukhf3Jj6D7sQE5TWDGcO8=","ARC-Authentication-Results":"i=1; server2.sourceware.org","Subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","From":"Lichenor Forgejo Bot via Sourceware Forge\n ","To":"gcc-patches mailing list ","Date":"Wed, 22 Apr 2026 18:06:28 +0000","Message-ID":"\n ","In-Reply-To":"\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/42","X-Comment":"\n https://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-5611","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"quoted-printable","MIME-Version":"1.0","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 ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3680770,"web_url":"http://patchwork.ozlabs.org/comment/3680770/","msgid":"","list_archive_url":null,"date":"2025-03-08T19:59:14","subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","submitter":{"id":93222,"url":"http://patchwork.ozlabs.org/api/people/93222/","name":"peppe via Sourceware Forge","email":"forge-bot+peppe@forge-stage.sourceware.org"},"content":"(peppe)) commented on the code:\n\n\n> +++ libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc\n> @@ -0,0 +13,4 @@\n> + vref.compare_exchange_weak(val, 0);\n> + vref.compare_exchange_strong(val, 0);\n> + vref.wait(0);\n> +}\nThis test is from the PR.\n\nIt's woefully incomplete (one should also test other types than `int`), but the problem is that it shows that the current patch is broken!\n\n```\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h: In instantiation of 'void std::__atomic_impl::wait(const _Tp*, _Val<_Tp>, std::memory_order) [with _Tp = volatile int; _Val<_Tp> = int]':\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1723: required from 'void std::__atomic_ref_base<_Tp, true, false, false>::wait(value_type, std::memory_order) const [with _Tp = volatile int; value_type = >\ngcc.git/libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc:15: required from here\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1140: error: no matching function for call to '__atomic_wait_address_v(const volatile int*&, std::__atomic_impl::_Val&, std::__atomic_impl::wait>\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1140: note: there is 1 candidate\nIn file included from gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:43:\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:423: note: candidate 1: 'template void std::__atomic_wait_address_v(const _Tp*, _Tp, _ValFn)'\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:423: note: template argument deduction/substitution failed:\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1140: note: deduced conflicting types for parameter '_Tp' ('volatile int' and 'int')\ncompiler exited with status 1\n```\n\nI was expecting for the atomic wait ABI stabilization to go in before trying to figure out how fix this -- the \"apparent\" problem is clear, __atomic_wait_address_v is getting called with inconsistent types and fails deduction, I just haven't studied the code enough to understand it.\n\n> +++ libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc\n> @@ -0,0 +13,4 @@\n> + vref.compare_exchange_weak(val, 0);\n> + vref.compare_exchange_strong(val, 0);\n> + vref.wait(0);\n> +}\n> I was expecting for the atomic wait ABI stabilization to go in before trying to figure out how fix this -- the \"apparent\" problem is clear, __atomic_wait_address_v is getting called with inconsistent types and fails deduction, I just haven't studied the code enough to understand it.\n\n\nI've rebased the patch past the ABI stabilization which just got merged. The wait() issue above is still there -- do you have some guidance as of how to tackle this?\n\n\n--\nhttps://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-746","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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org; dmarc=none (p=none dis=none)\n header.from=forge-stage.sourceware.org","sourceware.org;\n spf=pass smtp.mailfrom=forge-stage.sourceware.org","server2.sourceware.org;\n arc=none smtp.remote-ip=38.145.34.39"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g16mt59B8z1yGs\n\tfor ; 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a=rsa-sha256; d=sourceware.org; s=key; t=1776881214; cv=none;\n b=UCwPPOwfO1gwtHuARId3ToYd2GfcQCCoKx4ZRrgRcfW8dGf2Phf5UUnjTQcLpnOJvEfmD0pOkxzpRPFraWZtBgEN5wp8d662zxOUPlfWqLDwoXEMaq+uY+NY7muo9ZrMxQskEdRyMP54aCXqIKtR2QsLGOeg19552tsfW4HgdSs=","ARC-Message-Signature":"i=1; a=rsa-sha256; d=sourceware.org; s=key;\n t=1776881214; c=relaxed/simple;\n bh=fGRCkl4HCcrgjh13ScGXYrmHuV0qhCikLioRKLgxXIA=;\n h=Subject:From:To:Date:Message-ID:MIME-Version;\n b=thoc3cUAcm+6uHF4oTYbE2J3dgjkVc1iFz8/t6LfmWGomx84Z7cedMr6nI20pwqer+crqcOx8LkHXEg0EPLdIm2OtAbl63n57qJoI6LF4eqgwHk7dNIR5w54uL+iS9Doqa3Buo7YE4GnmldqtnDuFwuVhZ3ZNJeapSbsbMu7X7E=","ARC-Authentication-Results":"i=1; server2.sourceware.org","Subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","From":"peppe via Sourceware Forge ","To":"gcc-patches mailing list ","Date":"Sat, 08 Mar 2025 19:59:14 +0000","Message-ID":"\n ","In-Reply-To":"\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/42","X-Review":"https://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-746","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"quoted-printable","MIME-Version":"1.0","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 ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3680771,"web_url":"http://patchwork.ozlabs.org/comment/3680771/","msgid":"","list_archive_url":null,"date":"2026-04-22T18:06:53","subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","submitter":{"id":93212,"url":"http://patchwork.ozlabs.org/api/people/93212/","name":"Lichenor Forgejo Bot via Sourceware Forge","email":"forge-bot+forge-bot@forge-stage.sourceware.org"},"content":"Sent patch series version 1 containing 1 patches to gcc-patches mailing list .\n[Cover letter](https://inbox.sourceware.org/gcc-patches/bmm.hhunxrmijo.gcc.gcc-TEST.peppe.42.1.0@forge-stage.sourceware.org)\n\n--\nhttps://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-5613","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","Subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","From":"Lichenor Forgejo Bot via Sourceware Forge\n ","To":"gcc-patches mailing list ","Date":"Wed, 22 Apr 2026 18:06:53 +0000","Message-ID":"\n ","In-Reply-To":"\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/42","X-Comment":"\n https://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-5613","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"quoted-printable","MIME-Version":"1.0","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 ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3680773,"web_url":"http://patchwork.ozlabs.org/comment/3680773/","msgid":"","list_archive_url":null,"date":"2025-09-24T10:28:59","subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","submitter":{"id":93223,"url":"http://patchwork.ozlabs.org/api/people/93223/","name":"tkaminsk via Sourceware Forge","email":"forge-bot+tkaminsk@forge-stage.sourceware.org"},"content":"I will be continuing the work on this patch, with the goal to merge it to GCC 16.\n\n--\nhttps://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-2359","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","Subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","From":"tkaminsk via Sourceware Forge\n ","To":"gcc-patches mailing list ","Date":"Wed, 24 Sep 2025 10:28:59 +0000","Message-ID":"\n ","In-Reply-To":"\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/42","X-Comment":"\n https://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-2359","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"quoted-printable","MIME-Version":"1.0","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 ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3680774,"web_url":"http://patchwork.ozlabs.org/comment/3680774/","msgid":"","list_archive_url":null,"date":"2026-04-22T18:06:57","subject":"[SUMMARY] Re: [PATCH v1 0/1] WIP: libstdc++: add support for\n cv-qualified types in atomic_ref (P3323R1)","submitter":{"id":93222,"url":"http://patchwork.ozlabs.org/api/people/93222/","name":"peppe via Sourceware Forge","email":"forge-bot+peppe@forge-stage.sourceware.org"},"content":"This is a summary of discussions relative to the merge request created by (peppe) titled\nWIP: libstdc++: add support for cv-qualified types in atomic_ref (P3323R1)\nsince its creation.\n\nDescription: ```\nP3233R1 (DR for C++20/C++11, fixes LWG 4069 and 3508) clarifies that\nstd::atomic_ref is meant to be supported.\n\nThis commit implements it by splitting the __atomic_ref class (that\natomic_ref inherits from) into a further base class (__atomic_ref_base):\n\n* __atomic_ref_base implements the atomic API for const and non-const\n Ts (with specializations for integrals, floating points, pointers);\n* __atomic_ref inherits from __atomic_ref_base; if T is\n non-const adds on top the \"mutating\" atomic APIs like store(),\n exchange(), and so on; same discussion w.r.t. the specializations.\n\nThe primary atomic_ref is now meant to be used for cv-bool, not just\nbool, amend the detection accordingly.\n\nAt the same time, disable support for cv-qualified types in std::atomic\n(for instance, std::atomic isn't meaningful; one should use\nvolatile std::atomic), again as per the paper.\n\n\tPR libstdc++/115402\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/atomic_base.h: Add support for atomic_ref:\n\t refactor __atomic_ref into a further subclass in order to\n\t implement the constraints on atomic_ref mutating APIs; change\n _Tp in various function signatures to be value_type instead.\n\t* include/std/atomic: Add a static_assert to std::atomic, as per\n\t P3233R1, complementing the existing ones.\n\t* testsuite/29_atomics/atomic_ref/bool.cc: Add tests for\n\t cv types in atomic_ref.\n\t* testsuite/29_atomics/atomic_ref/deduction.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/float.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/generic.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/integral.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/pointer.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/requirements.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/wait_notify.cc: Likewise.\n\t* testsuite/29_atomics/atomic_ref/115402.cc: New test.\n```\n\nThe full and up to date discussion can be found at https://forge.sourceware.org/gcc/gcc-TEST/pulls/42\n\nThe merge request has been closed without being merged directly on the forge repository.\n\nOn 2025-03-08 19:59:13+00:00, (peppe) commented on the code:\n\n\n> +++ libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc\n> @@ -0,0 +13,4 @@\n> + vref.compare_exchange_weak(val, 0);\n> + vref.compare_exchange_strong(val, 0);\n> + vref.wait(0);\n> +}\nThis test is from the PR.\n\nIt's woefully incomplete (one should also test other types than `int`), but the problem is that it shows that the current patch is broken!\n\n```\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h: In instantiation of 'void std::__atomic_impl::wait(const _Tp*, _Val<_Tp>, std::memory_order) [with _Tp = volatile int; _Val<_Tp> = int]':\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1723: required from 'void std::__atomic_ref_base<_Tp, true, false, false>::wait(value_type, std::memory_order) const [with _Tp = volatile int; value_type = >\ngcc.git/libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc:15: required from here\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1140: error: no matching function for call to '__atomic_wait_address_v(const volatile int*&, std::__atomic_impl::_Val&, std::__atomic_impl::wait>\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1140: note: there is 1 candidate\nIn file included from gcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:43:\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:423: note: candidate 1: 'template void std::__atomic_wait_address_v(const _Tp*, _Tp, _ValFn)'\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_wait.h:423: note: template argument deduction/substitution failed:\ngcc-build/x86_64-pc-linux-gnu/libstdc++-v3/include/bits/atomic_base.h:1140: note: deduced conflicting types for parameter '_Tp' ('volatile int' and 'int')\ncompiler exited with status 1\n```\n\nI was expecting for the atomic wait ABI stabilization to go in before trying to figure out how fix this -- the \"apparent\" problem is clear, __atomic_wait_address_v is getting called with inconsistent types and fails deduction, I just haven't studied the code enough to understand it.\n> +++ libstdc++-v3/testsuite/29_atomics/atomic_ref/115402.cc\n> @@ -0,0 +13,4 @@\n> + vref.compare_exchange_weak(val, 0);\n> + vref.compare_exchange_strong(val, 0);\n> + vref.wait(0);\n> +}\n> I was expecting for the atomic wait ABI stabilization to go in before trying to figure out how fix this -- the \"apparent\" problem is clear, __atomic_wait_address_v is getting called with inconsistent types and fails deduction, I just haven't studied the code enough to understand it.\n\n\nI've rebased the patch past the ABI stabilization which just got merged. The wait() issue above is still there -- do you have some guidance as of how to tackle this?\n\n\nOn 2025-09-24 10:28:59+00:00, (tkaminsk) wrote:\n\nI will be continuing the work on this patch, with the goal to merge it to GCC 16.\n\n\nOn 2025-09-24 13:52:48+00:00, (tkaminsk) wrote:\n\nThis is continued as https://forge.sourceware.org/gcc/gcc-TEST/pulls/85.\n\n\nOn 2025-09-25 13:50:57+00:00, Jonathan Wakely (redi) wrote:\n\nClosing in favour of #85\n\n\nOn 2026-04-22 18:06:28+00:00, Lichenor Forgejo Bot (forge-bot) wrote:\n\n\nVersion 1 of this pull request has been stored. It includes the following commits:\n- libstdc++: add support for cv-qualified types in atomic_ref (P3323R1) - ed6c012d7290585f55872f690bee7b9e8f6bd1f7\n\n\n\nOn 2026-04-22 18:06:53+00:00, Lichenor Forgejo Bot (forge-bot) wrote:\n\nSent patch series version 1 containing 1 patches to gcc-patches mailing list .\n[Cover letter](https://inbox.sourceware.org/gcc-patches/bmm.hhunxrmijo.gcc.gcc-TEST.peppe.42.1.0@forge-stage.sourceware.org)","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; helo=vm01.sourceware.org;\n envelope-from=gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org;\n receiver=patchwork.ozlabs.org)","sourceware.org; dmarc=none (p=none dis=none)\n header.from=forge-stage.sourceware.org","sourceware.org;\n spf=pass smtp.mailfrom=forge-stage.sourceware.org","server2.sourceware.org;\n arc=none smtp.remote-ip=38.145.34.39"],"Received":["from vm01.sourceware.org (vm01.sourceware.org\n [IPv6:2620:52:6:3111::32])\n\t(using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)\n\t key-exchange x25519 server-signature ECDSA (secp384r1) server-digest SHA384)\n\t(No client certificate requested)\n\tby legolas.ozlabs.org (Postfix) with ESMTPS id 4g16pL3bhHz1yD5\n\tfor ; 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charset=\"utf-8\"","Content-Transfer-Encoding":"quoted-printable","MIME-Version":"1.0","Date":"Wed, 22 Apr 2026 18:06:57 +0000 (UTC)","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 ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}},{"id":3680775,"web_url":"http://patchwork.ozlabs.org/comment/3680775/","msgid":"","list_archive_url":null,"date":"2025-09-25T13:50:57","subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","submitter":{"id":93210,"url":"http://patchwork.ozlabs.org/api/people/93210/","name":"Jonathan Wakely via Sourceware Forge","email":"forge-bot+redi@forge-stage.sourceware.org"},"content":"Closing in favour of #85\n\n--\nhttps://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-2386","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=38.145.34.32; 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server2.sourceware.org","Subject":"Re: [PATCH v1 0/1] WIP: libstdc++: add support for cv-qualified types\n in atomic_ref (P3323R1)","From":"Jonathan Wakely via Sourceware Forge\n ","To":"gcc-patches mailing list ","Date":"Thu, 25 Sep 2025 13:50:57 +0000","Message-ID":"\n ","In-Reply-To":"\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/42","X-Comment":"\n https://forge.sourceware.org/gcc/gcc-TEST/pulls/42#issuecomment-2386","Content-Type":"text/plain; charset=\"utf-8\"","Content-Transfer-Encoding":"7bit","MIME-Version":"1.0","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 ","Errors-To":"gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org"}}]