gfortran with Xcode 4.3.2 unreliable

[Vincent Habchi]

> However, a comprehensive test suite that tests out fine with GCC 4.2, 4.3, 4.4, 4.5, 4.6, and 4.7, along with all flavors of (buggy) intel fortran compilers, and the PGI compilers all fail with this particular gfortran build.  I will look through your patch and see if it fixes my problems (this is affecting quite a few users of this program suite).  If so, hopefully the port maintainer (or some other dev) can apply this fix, because just fixing it for me is not enough (I have the 10.6 SDK, so I'm not even affected by this).

Are you using clang or llvm-gcc to compile gmp?

Vincent