http://gcc.gnu.org/bugzilla/show_bug.cgi?id=52179
--- Comment #10 from Mike Stump <mikestump at comcast dot net> 2012-02-23 04:34:30 UTC --- The proposed patch is wrong, the code is in boehm-gc/include/private/gcconfig.h, so the patch should change the ifdef DARWIN block there. I don't know why they have NO_PTHREAD_GET_STACKADDR_NP, so, I can't guess why they have it, though, I would be interested in their experience with it. Anyway, propose a patch for gcconfig.h and I would likely approve it.