http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55521
--- Comment #7 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-11-30 18:01:28 UTC --- This issue is further analyzed and a potential fix to mach_override proposed in http://lists.cs.uiuc.edu/pipermail/llvmdev/2012-November/056478.html.