http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48299
--- Comment #20 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-02-27 13:54:20 UTC --- Can folks on other failing targets try the backport of the thread_leak_test.c from upstream bdwgc? This seems to solve the issue on x86_64-apple-darwin11. Note that the test case has been refactored upstream to have GC_find_leak = 1 to be set on only once in main rather than repeatedly in the test subroutine (among other changes).