http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55309
--- Comment #37 from Kostya Serebryany <kcc at gcc dot gnu.org> 2013-02-12 11:17:45 UTC --- http://llvm.org/viewvc/llvm-project?rev=174957&view=rev (and r174958) change the default offset for x86_64 to 7fff8000 and changes __asan_init to __asan_init_v1