[Bug preprocessor/63831] [5 Regression] r217292 causes segfaults with -MM

[iains at gcc dot gnu.org]

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

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Blocks|                            |63773

--- Comment #12 from Iain Sandoe <iains at gcc dot gnu.org> ---
on any darwin post 11, there are headers including __has_attribute.
At present, this PR is only affecting darwin12 - and with c#10 proceeds almost
completely, but still blocks bootstrap building libada.

{hopefully, some analysis of the remaining fail will follow later today}