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GET /api/1.2/patches/2226342/?format=api
{ "id": 2226342, "url": "http://patchwork.ozlabs.org/api/1.2/patches/2226342/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/patch/20260422115114.798654-1-tkaminsk@redhat.com/", "project": { "id": 17, "url": "http://patchwork.ozlabs.org/api/1.2/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": "<20260422115114.798654-1-tkaminsk@redhat.com>", "list_archive_url": null, "date": "2026-04-22T11:50:07", "name": "[v2] libstdc++: Mandate power of two alignment for std::is_sufficiently_aligned.", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "7bcdd4374965b8142e164fe9f979224cb39326dd", "submitter": { "id": 90409, "url": "http://patchwork.ozlabs.org/api/1.2/people/90409/?format=api", "name": "Tomasz Kamiński", "email": "tkaminsk@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/gcc/patch/20260422115114.798654-1-tkaminsk@redhat.com/mbox/", "series": [ { "id": 500997, "url": "http://patchwork.ozlabs.org/api/1.2/series/500997/?format=api", "web_url": "http://patchwork.ozlabs.org/project/gcc/list/?series=500997", "date": "2026-04-22T11:50:07", "name": "[v2] libstdc++: Mandate power of two alignment for std::is_sufficiently_aligned.", "version": 2, "mbox": "http://patchwork.ozlabs.org/series/500997/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2226342/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2226342/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=C+VAd1Ut;\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": "This implements LWG4290. Missing Mandates clauses on is_sufficiently_aligned.\n\nlibstdc++-v3/ChangeLog:\n\n\t* include/bits/align.h (is_sufficiently_aligned): Mandate\n\tthat _Align is power of two.\n\t* testsuite/20_util/is_sufficiently_aligned/2_neg.cc: New test.\n---\nv2 replaces a test file used for chrono::format compilation time\ntesting, with actual test for is_sufficiently_aligned.\n\nThe test was included in previous run. OK for trunk?\n\n libstdc++-v3/include/bits/align.h | 5 ++++-\n .../20_util/is_sufficiently_aligned/2_neg.cc | 12 ++++++++++++\n 2 files changed, 16 insertions(+), 1 deletion(-)\n create mode 100644 libstdc++-v3/testsuite/20_util/is_sufficiently_aligned/2_neg.cc", "diff": "diff --git a/libstdc++-v3/include/bits/align.h b/libstdc++-v3/include/bits/align.h\nindex 1a14e282216..3c8355d0e07 100644\n--- a/libstdc++-v3/include/bits/align.h\n+++ b/libstdc++-v3/include/bits/align.h\n@@ -116,7 +116,10 @@ align(size_t __align, size_t __size, void*& __ptr, size_t& __space) noexcept\n [[nodiscard,__gnu__::__always_inline__]]\n inline bool\n is_sufficiently_aligned(_Tp* __ptr)\n- { return reinterpret_cast<__UINTPTR_TYPE__>(__ptr) % _Align == 0; }\n+ { \n+ static_assert(std::has_single_bit(_Align));\n+ return reinterpret_cast<__UINTPTR_TYPE__>(__ptr) % _Align == 0;\n+ }\n #endif // __glibcxx_is_sufficiently_aligned\n \n _GLIBCXX_END_NAMESPACE_VERSION\ndiff --git a/libstdc++-v3/testsuite/20_util/is_sufficiently_aligned/2_neg.cc b/libstdc++-v3/testsuite/20_util/is_sufficiently_aligned/2_neg.cc\nnew file mode 100644\nindex 00000000000..9db69b67ef6\n--- /dev/null\n+++ b/libstdc++-v3/testsuite/20_util/is_sufficiently_aligned/2_neg.cc\n@@ -0,0 +1,12 @@\n+// { dg-do compile { target c++26 } }\n+\n+#include <memory>\n+\n+void\n+test01(int* ptr)\n+{\n+ (void)std::is_sufficiently_aligned<5>(ptr); // { dg-error \"here\" }\n+ (void)std::is_sufficiently_aligned<7>(ptr); // { dg-error \"here\" }\n+}\n+\n+// { dg-error \"static assertion failed\" \"\" { target *-*-* } 0 }\n", "prefixes": [ "v2" ] }