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GET /api/1.1/patches/2225355/?format=api
{ "id": 2225355, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2225355/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260420212533.3862595-1-ppalka@redhat.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.1/projects/17/?format=api", "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 }, "msgid": "<20260420212533.3862595-1-ppalka@redhat.com>", "date": "2026-04-20T21:25:33", "name": "libstdc++: Restrict engaged -> disengaged std::optional fix [PR124910]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "9b569ca8aff01b9c7efb02f87de0a10648a0bda2", "submitter": { "id": 78319, "url": "http://patchwork.ozlabs.org/api/1.1/people/78319/?format=api", "name": "Patrick Palka", "email": "ppalka@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260420212533.3862595-1-ppalka@redhat.com/mbox/", "series": [ { "id": 500686, "url": "http://patchwork.ozlabs.org/api/1.1/series/500686/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500686", "date": "2026-04-20T21:25:33", "name": "libstdc++: Restrict engaged -> disengaged std::optional fix [PR124910]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/500686/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225355/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225355/checks/", "tags": {}, "headers": { "Return-Path": "<gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org>", "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\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=Tn3InJn8;\n\tdkim-atps=neutral", "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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charset=\"US-ASCII\"; x-default=true", "X-BeenThere": "gcc-patches@gcc.gnu.org", "X-Mailman-Version": "2.1.30", "Precedence": "list", "List-Id": "Gcc-patches mailing list <gcc-patches.gcc.gnu.org>", "List-Unsubscribe": "<https://gcc.gnu.org/mailman/options/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=unsubscribe>", "List-Archive": "<https://gcc.gnu.org/pipermail/gcc-patches/>", "List-Post": "<mailto:gcc-patches@gcc.gnu.org>", "List-Help": "<mailto:gcc-patches-request@gcc.gnu.org?subject=help>", "List-Subscribe": "<https://gcc.gnu.org/mailman/listinfo/gcc-patches>,\n <mailto:gcc-patches-request@gcc.gnu.org?subject=subscribe>", "Errors-To": "gcc-patches-bounces~incoming=patchwork.ozlabs.org@gcc.gnu.org" }, "content": "Tested on x86_64-pc-linux-gnu, does this look OK for trunk?\n\n-- >8 --\n\nIt turns out a union without an active member does not violate C++20 core\nconstant expression rules and r16-8748 was really just a workaround for\na front end bug. The actual underlying problem -- that the constexpr\nevaluator treated an explicitly destroyed union member as still active\n-- has been fixed by r16-8767 which makes this workaround unnecessary\nfor GCC. Rather than remove the workaround, restrict it to Clang which\nseems to have a similar bug.\n\n\tPR c++/124910\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/std/optional (_Optional_payload_base::_M_destroy):\n\tRestrict r16-8748 workaround to Clang, and adjust comment.\n---\n libstdc++-v3/include/std/optional | 5 ++---\n 1 file changed, 2 insertions(+), 3 deletions(-)", "diff": "diff --git a/libstdc++-v3/include/std/optional b/libstdc++-v3/include/std/optional\nindex 49ba7b6b45dd..b9cc019feff7 100644\n--- a/libstdc++-v3/include/std/optional\n+++ b/libstdc++-v3/include/std/optional\n@@ -321,10 +321,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n {\n \t_M_engaged = false;\n \t_M_payload._M_value.~_Stored_type();\n-#if __cpp_lib_optional >= 202106L // full constexpr support\n+#if defined(__clang__) && __cpp_lib_optional >= 202106L // full constexpr support\n \tif (std::is_constant_evaluated())\n-\t // Ensure union _M_payload always has an active member, for sake\n-\t // of the core constant expression requirements.\n+\t // Work around PR124910 for Clang.\n \t std::construct_at(std::__addressof(_M_payload._M_empty));\n #endif\n }\n", "prefixes": [] }