http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47175
--- Comment #3 from H.J. Lu <hjl.tools at gmail dot com> 2011-01-05 14:28:51 UTC --- (In reply to comment #2) > (In reply to comment #1) > > Checking __amd64, __amd64__, __x86_64 __x86_64__ for > > pointer size is wrong since pointer size may be > > 32bit on x86-64. > No, it can't be. The macros are set in dependence of the target platform (m32 > or m64). That means, if m32 is given the macro __i686 is set instead of > __amd64. On the other hand, if m64 is given the macro __amd64 is set. I don't > want to know the really underlying platform. I (or Matlab) want to know the > target platform. So it is right to check the __amd64 macro. You can try it > with > the gcc-4.4. Only with gfortran-4.4 the macro is missed. See http://www.kernel.org/pub/linux/devel/binutils/ilp32/abi.pdf where pointer size is 32bit.
