http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55679
--- Comment #9 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-12-14 00:45:26 UTC --- The c-c++-common/asan/swapcontext-test-1.c test case should have... // { dg-skip-if "" { *-*-darwin* } { "*" } { "" } } since ucontext support was depreciated in Mac OS X 10.6 and removed entirely in Mac OS X 10.7.