[Bug libffi/64572] r219477 breaks bootstrap on x86_64 darwin

[rth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64572

Richard Henderson <rth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2015-01-12
     Ever confirmed|0                           |1

--- Comment #2 from Richard Henderson <rth at gcc dot gnu.org> ---
At the bottom of libffi/configure.host, try

  X86_64_DARWIN)
        SOURCES="darwin64_c.c darwin64.S"
+       TARGET=X86_64
        ;;