https://github.com/frederick-vs-ja created https://github.com/llvm/llvm-project/pull/129814
Per P2493R0 and SD6, `__cpp_constexpr` of value `202002L` indicates that P1330R0 "Changing the active member of a union inside constexpr" is implemented, which is true for Clang 9 and later. Fixes #129730. >From 002490cf1979bbbecef3bc0958ef413f5b85f849 Mon Sep 17 00:00:00 2001 From: "A. Jiang" <d...@live.cn> Date: Wed, 5 Mar 2025 09:41:33 +0800 Subject: [PATCH] [Clang] Bump `__cpp_constexpr` to `202002L` in C++20 mode Per P2493R0 and SD6, `__cpp_constexpr` of value `202002L` indicates that P1330R0 "Changing the active member of a union inside constexpr" is implemented, which is true for Clang 9 and later. --- clang/docs/ReleaseNotes.rst | 3 +++ clang/lib/Frontend/InitPreprocessor.cpp | 2 +- clang/test/Lexer/cxx-features.cpp | 2 +- 3 files changed, 5 insertions(+), 2 deletions(-) diff --git a/clang/docs/ReleaseNotes.rst b/clang/docs/ReleaseNotes.rst index 37ea963bf337d..9b5bf115694f7 100644 --- a/clang/docs/ReleaseNotes.rst +++ b/clang/docs/ReleaseNotes.rst @@ -96,6 +96,9 @@ Resolutions to C++ Defect Reports - Implemented `CWG2918 Consideration of constraints for address of overloaded ` `function <https://cplusplus.github.io/CWG/issues/2918.html>`_ +- Bumped the ``__cpp_constexpr`` feature-test macro to ``202002L`` in C++20 mode as indicated in + `P2493R0 <https://wg21.link/P2493R0>`_. + C Language Changes ------------------ diff --git a/clang/lib/Frontend/InitPreprocessor.cpp b/clang/lib/Frontend/InitPreprocessor.cpp index e1dc728558def..1a816cb6269d4 100644 --- a/clang/lib/Frontend/InitPreprocessor.cpp +++ b/clang/lib/Frontend/InitPreprocessor.cpp @@ -664,7 +664,7 @@ static void InitializeCPlusPlusFeatureTestMacros(const LangOptions &LangOpts, Builder.defineMacro("__cpp_lambdas", "200907L"); Builder.defineMacro("__cpp_constexpr", LangOpts.CPlusPlus26 ? "202406L" : LangOpts.CPlusPlus23 ? "202211L" - : LangOpts.CPlusPlus20 ? "201907L" + : LangOpts.CPlusPlus20 ? "202002L" : LangOpts.CPlusPlus17 ? "201603L" : LangOpts.CPlusPlus14 ? "201304L" : "200704"); diff --git a/clang/test/Lexer/cxx-features.cpp b/clang/test/Lexer/cxx-features.cpp index ff9a1a1210c44..8c1867d5c7365 100644 --- a/clang/test/Lexer/cxx-features.cpp +++ b/clang/test/Lexer/cxx-features.cpp @@ -314,7 +314,7 @@ #error "wrong value for __cpp_lambdas" #endif -#if check(constexpr, 0, 200704, 201304, 201603, 201907, 202211, 202406L) +#if check(constexpr, 0, 200704, 201304, 201603, 202002, 202211, 202406L) #error "wrong value for __cpp_constexpr" #endif _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
