http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55599
--- Comment #5 from Alexander Potapenko <glider at google dot com> 2012-12-05 04:50:43 UTC --- The dynamic interposition library is based on the __DATA,__interpose dyld feature (see http://toves.freeshell.org/interpose/ or Amit Singh's "Mac OS X Internals" book), which strictly requires the interposing functions to be in a shared library that must be preloaded using DYLD_INSERT_LIBRARIES (ASan does that automatically in __asan_init) The dynamic library doesn't require the mach_override code (we don't link it in LLVM), but the static one does. Since you have removed the mach_override code, it's time to drop the static library support (note that in LLVM the static runtime library is still the default one, because it's now the one that simply works)
