https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109606
--- Comment #4 from Alexander ---
^ I meant `__is_same`, not `__same_as` (typo)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109606
--- Comment #3 from Alexander ---
(In reply to Jonathan Wakely from comment #1)
> Yes. Using libstdc++ headers with older **or newer** versions of GCC is
> completely unsupported. For other compilers, they need to be sufficiently
> close to GCC,
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109606
Bug ID: 109606
Summary: Unguarded `__is_same` builtin usage
Product: gcc
Version: 12.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: libstdc++
