Tested x86_64-linux. Pusued to trunk. I'll backport it too. -- >8 --
These non-standard extensions use GCC-specific built-ins. Use __has_builtin to avoid errors when Clang compiles this header. See https://github.com/llvm/llvm-project/issues/24289 libstdc++-v3/ChangeLog: * include/tr2/type_traits (bases, direct_bases): Use __has_builtin to check if required built-ins are supported. --- libstdc++-v3/include/tr2/type_traits | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/libstdc++-v3/include/tr2/type_traits b/libstdc++-v3/include/tr2/type_traits index a7ebaf66947..603039de894 100644 --- a/libstdc++-v3/include/tr2/type_traits +++ b/libstdc++-v3/include/tr2/type_traits @@ -82,20 +82,23 @@ namespace tr2 /// Sequence abstraction metafunctions for manipulating a typelist. - +#if __has_builtin(__bases) /// Enumerate all the base classes of a class. Form of a typelist. template<typename _Tp> struct bases { typedef __reflection_typelist<__bases(_Tp)...> type; }; +#endif +#if __has_builtin(__direct_bases) /// Enumerate all the direct base classes of a class. Form of a typelist. template<typename _Tp> struct direct_bases { typedef __reflection_typelist<__direct_bases(_Tp)...> type; }; +#endif /// @} group metaprogramming } -- 2.43.0
