http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55521
--- Comment #16 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-12-02 05:38:09 UTC --- Using mac function interposition on x86_64-apple-darwin12 produces only 8 remaining g++ testsuite failures emitting ASAN:SIGSEGV messages compared to 10 seen in the g++ testsuite under x86_64 Fedora 15. Also on x86_64-apple-darwin12, the switch from mach_override to mac function interposition reduces the unexpected failures in the g++ testsuite from 841 to 323. This is still far more than seen under x86_64 Fedora 15 (which shows 107) but still is a major improvement over mach_override.