http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54172
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> 2012-08-30 08:19:56 UTC --- Send to both gcc-patches at gcc.gnu.org and libstdc++ at gcc.gnu.org. I think it would be better to send both hunks separately, as the first hunk is shorter for backporting and the only necessary thing to fix, and you should include ChangeLog entries alongside with the patches, something like: 2012-08-30 Thiago Macieira <whatever@whatever.whatever> PR libstdc++/54172 * libsupc++/guard.cc (__cxa_guard_acquire): Describe your change here.