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GET /api/patches/2196417/?format=api
{ "id": 2196417, "url": "http://patchwork.ozlabs.org/api/patches/2196417/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260213201753.379712-1-polacek@redhat.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/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, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260213201753.379712-1-polacek@redhat.com>", "list_archive_url": null, "date": "2026-02-13T20:17:53", "name": "libstdc++: bit_cast and consteval-only types [PR124096]", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "c089591665c72d709b95ebd0b3b5b0a06437ccd4", "submitter": { "id": 14370, "url": "http://patchwork.ozlabs.org/api/people/14370/?format=api", "name": "Marek Polacek", "email": "polacek@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260213201753.379712-1-polacek@redhat.com/mbox/", "series": [ { "id": 492135, "url": "http://patchwork.ozlabs.org/api/series/492135/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=492135", "date": "2026-02-13T20:17:53", "name": "libstdc++: bit_cast and consteval-only types [PR124096]", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/492135/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2196417/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2196417/checks/", "tags": {}, "related": [], "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=ZeKykmpa;\n\tdkim-atps=neutral", "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", "DKIM-Signature": "v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;\n s=mimecast20190719; t=1771013884;\n h=from:from:reply-to:subject:subject:date:date:message-id:message-id:\n to:to:cc:mime-version:mime-version:content-type:content-type:\n content-transfer-encoding:content-transfer-encoding;\n bh=D5TVG7ZH8pUH7eE+FGXuMA3Z8hPEXQM1Y2N+2v/zyZQ=;\n b=ZeKykmpa1lGcUfqaH9NwoVvOrMou0k9SJFmMRK5/ObLeox+yur+QB6eYrcDjtOTHUn0jd5\n 0v3Ngaqh0+kXxR0Oiq6k0WZXBAUDckeLU3Ac1XZSkVF3jWzuwdMR6abag/9/yHTu+ogBnf\n kOcQGSNqrVi5CNa+bQPJ+dyE3w3bchQ=", "X-MC-Unique": "gKzIuZhXNmmAtlwk4COD3g-1", "X-Mimecast-MFC-AGG-ID": "gKzIuZhXNmmAtlwk4COD3g_1771013881", "From": "Marek Polacek <polacek@redhat.com>", "To": "GCC Patches <gcc-patches@gcc.gnu.org>,\n\tlibstdc++ <libstdc++@gcc.gnu.org>", "Subject": "[PATCH] libstdc++: bit_cast and consteval-only types [PR124096]", "Date": "Fri, 13 Feb 2026 15:17:53 -0500", "Message-ID": "<20260213201753.379712-1-polacek@redhat.com>", "MIME-Version": "1.0", "X-Scanned-By": "MIMEDefang 3.4.1 on 10.30.177.111", "X-Mimecast-Spam-Score": "0", "X-Mimecast-MFC-PROC-ID": "1Ect7doy_PEWXxkyw6-Afnm4MqdaeFIHKkjOOdiFRjQ_1771013881", "X-Mimecast-Originator": "redhat.com", "Content-Transfer-Encoding": "8bit", "content-type": "text/plain; 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": "Bootstrapped/regtested on x86_64-pc-linux-gnu, ok for trunk?\n\n-- >8 --\n[bit.cast]/2: Mandates: Neither To nor From are consteval-only types\n\nbut we are not checking this, so the attached test compiled.\n\n\tPR libstdc++/124096\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/std/bit: Check that neither To nor From are consteval-only\n\ttypes.\n\t* testsuite/26_numerics/bit/bit.cast/124096.cc: New test.\n---\n libstdc++-v3/include/std/bit | 4 ++++\n .../testsuite/26_numerics/bit/bit.cast/124096.cc | 13 +++++++++++++\n 2 files changed, 17 insertions(+)\n create mode 100644 libstdc++-v3/testsuite/26_numerics/bit/bit.cast/124096.cc\n\n\nbase-commit: 8a794643cc71301d96bb0e62c8d89494929fa0eb", "diff": "diff --git a/libstdc++-v3/include/std/bit b/libstdc++-v3/include/std/bit\nindex 6ea0f6eef83..f33acb999cf 100644\n--- a/libstdc++-v3/include/std/bit\n+++ b/libstdc++-v3/include/std/bit\n@@ -93,6 +93,10 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION\n && is_trivially_copyable_v<_To> && is_trivially_copyable_v<_From>\n #endif\n {\n+#if __cpp_impl_reflection >= 202506L\n+ static_assert(!is_consteval_only_v<_To> && !is_consteval_only_v<_From>,\n+\t\t \"neither To nor From can be consteval-only types\");\n+#endif\n return __builtin_bit_cast(_To, __from);\n }\n #endif // __cpp_lib_bit_cast\ndiff --git a/libstdc++-v3/testsuite/26_numerics/bit/bit.cast/124096.cc b/libstdc++-v3/testsuite/26_numerics/bit/bit.cast/124096.cc\nnew file mode 100644\nindex 00000000000..12c93f712df\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/26_numerics/bit/bit.cast/124096.cc\n@@ -0,0 +1,13 @@\n+// PR libstdc++/124096\n+// { dg-do compile { target c++26 } }\n+// { dg-additional-options \"-freflection\" }\n+\n+#include <bit>\n+\n+consteval void\n+f ()\n+{\n+ (void) std::bit_cast<long long>(^^int); // { dg-error \"here\" }\n+}\n+\n+// { dg-error \"static assertion failed:\" \"\" { target *-*-* } 0 }\n", "prefixes": [] }