https://github.com/Tsche created https://github.com/llvm/llvm-project/pull/219105
GCC gained a `[[gnu::flag_enum]]` attribute for consistency with clang in GCC 15. With this patch, the `[[gnu::flag_enum]]` is recognized and handled equivalently to `[[clang::flag_enum]]`. The patch introducing `[[gnu::flag_enum]]` in GCC is https://github.com/gcc-mirror/gcc/commit/1914ca8791ce4e0ba821e818cb6f86c76afdb6f2. GCC treats `[[clang::flag_enum]]` as equivalent to `[[gnu::flag_enum]`. >From 25cae9f959c098336ab7f6ce9c49a9ee820fd4fe Mon Sep 17 00:00:00 2001 From: Matthias Wippich <[email protected]> Date: Thu, 27 Aug 2026 05:54:41 +0200 Subject: [PATCH] [clang] treat [[gnu::flag_enum]] as equivalent to [[clang::flag_enum]] --- clang/docs/ReleaseNotes.md | 2 ++ clang/include/clang/Basic/Attr.td | 2 +- clang/test/Sema/attr-c2x.c | 4 ++++ 3 files changed, 7 insertions(+), 1 deletion(-) diff --git a/clang/docs/ReleaseNotes.md b/clang/docs/ReleaseNotes.md index cd7f40aec112d..c62653d3d3f78 100644 --- a/clang/docs/ReleaseNotes.md +++ b/clang/docs/ReleaseNotes.md @@ -234,6 +234,8 @@ features cannot lower the translation-unit ABI level; - Clang now properly propagates attributes on class and variable templates to their redeclarations, which will result in redeclarations not interfering with diagnostics. (#GH209812) +- Clang now recognizes the `[[gnu::flag_enum]]` attribute and treats it equivalent to `[[clang::flag_enum]]` + ### Improvements to Clang's diagnostics - More consistent rendering of Unicode characters in diagnostic messages. diff --git a/clang/include/clang/Basic/Attr.td b/clang/include/clang/Basic/Attr.td index 252b53e25e5c8..181eee2b066c8 100644 --- a/clang/include/clang/Basic/Attr.td +++ b/clang/include/clang/Basic/Attr.td @@ -1994,7 +1994,7 @@ def MinSize : InheritableAttr { } def FlagEnum : InheritableAttr { - let Spellings = [Clang<"flag_enum">]; + let Spellings = [ClangGCC<"flag_enum">]; let Subjects = SubjectList<[Enum]>; let Documentation = [FlagEnumDocs]; let SimpleHandler = 1; diff --git a/clang/test/Sema/attr-c2x.c b/clang/test/Sema/attr-c2x.c index eff90d639c0c0..017db3bee7a21 100644 --- a/clang/test/Sema/attr-c2x.c +++ b/clang/test/Sema/attr-c2x.c @@ -11,6 +11,10 @@ enum [[clang::flag_enum]] EnumFlag { D0 = 1, D1 = 8 }; +enum [[gnu::flag_enum]] EnumFlag2 { + E0 = 1, E1 = 8 +}; + [[clang::overloadable]] void foo(void *c); [[clang::overloadable]] void foo(char *c); _______________________________________________ cfe-commits mailing list [email protected] https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
