https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63831

Iain Sandoe <iains at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |NEW
   Last reconfirmed|                            |2014-11-12
     Ever confirmed|0                           |1

--- Comment #2 from Iain Sandoe <iains at gcc dot gnu.org> ---
confirmed - 
another trivial reproducer.

#ifdef __has_attribute
  #if __has_attribute(availability)
     /* use better attributes if possible */
  #endif
#endif

note - this blocks bootstrap on x86_64-darwin12, which uses that construct in
an unavoidable system header (it's only pure luck AFAICT that it doesn't break
on darwin13, and darwin14).

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