http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60055
--- Comment #1 from chefmax at gcc dot gnu.org --- Created attachment 32034 --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32034&action=edit Proposed patch Attached patch seems to fix the bug. $ readelf -s ~/gcc-master-install/lib64/libtsan.so | grep tsan_default 3305: 000000000002c2b5 8 FUNC WEAK DEFAULT 10 __tsan_default_options