http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51906
--- Comment #8 from Jack Howarth <howarth at nitro dot med.uc.edu> 2012-01-27 17:36:08 UTC --- Opened as radr://10765474, "darwin11 linker bug exposed by new libstdc++ thread tests" although it appears to be more complex than a simple linker bug as... 1) 30_threads/recursive_mutex/try_lock/1.cc compiled under darwin10 runs fine under darwin11. Also, the darwin10 generated 1.s can be reassembled and relinked under darwin11 and the resulting 1.exe runs fine. 2) 30_threads/recursive_mutex/try_lock/1.cc compiled under darwin11 using -mmacosx-version-min=10.6 fails when run under either darwin11 or darwin10. Using the 1.s generated above to reassemble and relink under darwin10 still shows the execution failure.
