https://gcc.gnu.org/bugzilla/show_bug.cgi?id=99587

--- Comment #2 from Florian Weimer <fw at gcc dot gnu.org> ---
The problem is that if GCC is not configured for SHF_GNU_RETAIN,
__has_attribute (retain) should not be true.

That is, __has_attribute needs to reflect the actual attribute support status,
and not what happens to be registered as attributes in the GCC codebase. 
__has_builtin has the same problem, see bug 96952 for an example.

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