http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55289
--- Comment #39 from Alexander Potapenko <glider at google dot com> 2012-11-15 08:18:01 UTC --- I agree with Kostya that no major changes to mach_override are necessary because we are really going to dump it. However minor fixes required for ASan in GCC to work on Darwin right now should be perfectly ok. As there currently are issues blocking the dynamic ASan runtime (e.g. https://code.google.com/p/address-sanitizer/issues/detail?id=124), and we still depend on CoreFoundation I can't promise that we'll get rid of mach_override before the GCC 4.8 release.