https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110572
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Right, for Clang we need:
--- a/libstdc++-v3/libsupc++/typeinfo
+++ b/libstdc++-v3/libsupc++/typeinfo
@@ -73,7 +73,7 @@ namespace __cxxabiv1
// By default follow the old inline rules to avoid ABI changes.
#ifndef __GXX_TYPEINFO_EQUALITY_INLINE
-# if !__GXX_WEAK__
+# if !__GXX_WEAK__ || defined(_WIN32)
# define __GXX_TYPEINFO_EQUALITY_INLINE 0
# else
# define __GXX_TYPEINFO_EQUALITY_INLINE 1
@@ -188,6 +188,9 @@ namespace std
#endif
#if __GXX_TYPEINFO_EQUALITY_INLINE || __cplusplus > 202002L
+#if ! __GXX_TYPEINFO_EQUALITY_INLINE
+ [[__gnu__::__always_inline__]]
+# endif
_GLIBCXX23_CONSTEXPR inline bool
type_info::operator==(const type_info& __arg) const _GLIBCXX_NOEXCEPT
{
Because otherwise the macro gets defined to 1 and so the always_inline
attribute isn't used.
