https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64572
--- Comment #22 from howarth at bromo dot med.uc.edu --- I did a quick and dirty test in the i386/libffi build directory of rebuilding and rerunning make check as I reverted each source file and header being compiled on darwin to the pre-r184997 contents. The test suite failures from comment 8 remained after all the *.c/*.h changes where reverted and only disappeared when I finally replaced the generated ffi.h header with one from a build prior to r184997. So I suspect the problem may actually lie in the include/ffi.h.in changes.