https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93419
--- Comment #3 from kloetzl <fabian-gcc at kloetzl dot info> --- Hm, I feared that this would be the answer I would get. This makes GCCs __has_attribute much less useful than Clangs version where the docs state: “This function-like macro takes a single identifier argument that is the name of a GNU-style attribute. It evaluates to 1 if the attribute is supported by the current compilation target, or 0 if not.”
