https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65479
--- Comment #2 from Martin Sebor <msebor at gcc dot gnu.org> --- Created attachment 35196 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35196&action=edit Proof-of-concept patch. Two problems are contributing to the failures in these tests: 1) a missing -fasynchronous-unwind-tables option; the option is necessary on powerpc*-*-*-* to generate a full stack trace 2) a bug in the backtrace_qsort function introduced in r208403 that makes the algorithm unstable (see also http://gcc.gnu.org/ml/gcc-patches/2014-03/msg00342.html) The attached proof-of-concept patch adds the missing option mentioned in (1) and backs out the commit referenced in (2) as a proof of concept of fixing the problem. I'll try to come up with an approach that doesn't undo the performance improvement in a subsequent patch.
