https://github.com/a-tarasyuk updated https://github.com/llvm/llvm-project/pull/147711
>From 20b9d9bb16f82120cee41bf6a59d3bfa34aa0d3b Mon Sep 17 00:00:00 2001 From: Oleksandr Tarasiuk <oleksandr.taras...@outlook.com> Date: Wed, 9 Jul 2025 15:16:45 +0300 Subject: [PATCH] [Clang] fixed false positive redeclaration error for using enum in nested scopes --- clang/docs/ReleaseNotes.rst | 4 +++- clang/lib/Sema/SemaDeclCXX.cpp | 2 +- clang/test/SemaCXX/cxx20-using-enum.cpp | 14 ++++++++++++++ 3 files changed, 18 insertions(+), 2 deletions(-) diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 57a94242c9e61..086f0fce4975f 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -770,8 +770,10 @@ Bug Fixes in This Version - In C23, something like ``[[/*possible attributes*/]];`` is an attribute declaration, not a statement. So it is not allowed by the syntax in places where a statement is required, specifically as the secondary block of a - selection or iteration statement. This differs from C++, since C++ allows + selection or iteration statement. This differs from C++, since C++ allows declaration statements. Clang now emits a warning for these patterns. (#GH141659) +- Fixed false positives for redeclaration errors of using enum in + nested scopes. (#GH147495) Bug Fixes to Compiler Builtins ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ diff --git a/clang/lib/Sema/SemaDeclCXX.cpp b/clang/lib/Sema/SemaDeclCXX.cpp index a49a8abb677c5..5cc92ebb0171f 100644 --- a/clang/lib/Sema/SemaDeclCXX.cpp +++ b/clang/lib/Sema/SemaDeclCXX.cpp @@ -13308,7 +13308,7 @@ NamedDecl *Sema::BuildUsingEnumDeclaration(Scope *S, AccessSpecifier AS, LookupResult Previous(*this, UsingEnumName, LookupUsingDeclName, RedeclarationKind::ForVisibleRedeclaration); - LookupName(Previous, S); + LookupQualifiedName(Previous, CurContext); for (NamedDecl *D : Previous) if (UsingEnumDecl *UED = dyn_cast<UsingEnumDecl>(D)) diff --git a/clang/test/SemaCXX/cxx20-using-enum.cpp b/clang/test/SemaCXX/cxx20-using-enum.cpp index 14ef4b29925a1..775b65c5a8d8e 100644 --- a/clang/test/SemaCXX/cxx20-using-enum.cpp +++ b/clang/test/SemaCXX/cxx20-using-enum.cpp @@ -274,4 +274,18 @@ void f(int a) { } } +namespace GH147495 { +struct S { + enum class E { A }; + using enum E; + + struct S1 { + using enum E; + }; + + struct S2 { + using E::A; + }; +}; +} #endif _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits