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#   ifdef __APPLE__ /* Mac OS X uses a 16-byte aligned stack and not a
4-byte one */
#    define __stdcall __attribute__((__stdcall__))
__attribute__((__force_align_arg_pointer__))
#   else
#    define __stdcall __attribute__((__stdcall__))
#   endif

Maybe then it's time we got rid of the #ifdef __APPLE__ block, then, and
used the OS X definition everywhere? Or, we could use your switch, and
that would obviate the need for __force_align_arg_pointer__ with gcc
(but not clang, because it doesn't implement that switch yet).

Chip