[libcxx-commits] [libcxx] d70e50b - [libc++] Don't try to used noexcept in C++03

[Nikolas Klauser via libcxx-commits]

Author: Nikolas Klauser
Date: 2025-08-12T20:31:00+02:00
New Revision: d70e50b0da85970ddcbb632e6068d558a7cce5e6

URL: https://github.com/llvm/llvm-project/commit/d70e50b0da85970ddcbb632e6068d558a7cce5e6
DIFF: https://github.com/llvm/llvm-project/commit/d70e50b0da85970ddcbb632e6068d558a7cce5e6.diff

LOG: [libc++] Don't try to used noexcept in C++03

`__is_nothrow_invocable` isn't used in C++03, so we never noticed that
it's not `constexpr`. This is caught by the clang-tidy ADL check
with LLVM 22, since it's treated like a normal function call in C++03.
It's only caught with LLVM 22, since `__builtin_invoke` wasn't available
before.

Added: 
    

Modified: 
    libcxx/include/__type_traits/invoke.h

Removed: 
    


################################################################################
diff  --git a/libcxx/include/__type_traits/invoke.h b/libcxx/include/__type_traits/invoke.h
index 3f5626c014432..24702b6d5b52b 100644
--- a/libcxx/include/__type_traits/invoke.h
+++ b/libcxx/include/__type_traits/invoke.h
@@ -112,8 +112,10 @@ inline const bool __is_invocable_r_v = __is_invocable_r_impl<_Ret, __is_invocabl
 template <bool __is_invocable, class... _Args>
 inline const bool __is_nothrow_invocable_impl = false;
 
+#  ifndef _LIBCPP_CXX03_LANG
 template <class... _Args>
 inline const bool __is_nothrow_invocable_impl<true, _Args...> = noexcept(__builtin_invoke(std::declval<_Args>()...));
+#  endif
 
 template <class... _Args>
 inline const bool __is_nothrow_invocable_v = __is_nothrow_invocable_impl<__is_invocable_v<_Args...>, _Args...>;