https://gcc.gnu.org/g:db072f75e5ade3b9f1f2ff76fcdfda0d3bf028d1
commit r16-7485-gdb072f75e5ade3b9f1f2ff76fcdfda0d3bf028d1 Author: Jonathan Wakely <[email protected]> Date: Thu Feb 12 18:52:12 2026 +0000 libstdc++: Fix fallback definitions of std::is_member_*_pointer When the builtins aren't used we need a declaration of std::is_function for the fallback definitions of std::is_member_function_pointer and std::is_member_object_pointer. libstdc++-v3/ChangeLog: * include/std/type_traits (is_function): Declare before first use. Diff: --- libstdc++-v3/include/std/type_traits | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/libstdc++-v3/include/std/type_traits b/libstdc++-v3/include/std/type_traits index d533dc0ef09e..ea700d1ed97d 100644 --- a/libstdc++-v3/include/std/type_traits +++ b/libstdc++-v3/include/std/type_traits @@ -674,6 +674,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION : public __bool_constant<__is_member_object_pointer(_Tp)> { }; #else + template<typename _Tp> + struct is_function; + template<typename> struct __is_member_object_pointer_helper : public false_type { }; @@ -696,6 +699,9 @@ _GLIBCXX_BEGIN_NAMESPACE_VERSION : public __bool_constant<__is_member_function_pointer(_Tp)> { }; #else + template<typename _Tp> + struct is_function; + template<typename> struct __is_member_function_pointer_helper : public false_type { };
