http://gcc.gnu.org/bugzilla/show_bug.cgi?id=54724
--- Comment #2 from Mike Frysinger <vapier at gentoo dot org> 2012-09-28 23:20:09 UTC --- i'm 50/50 on this. if the code doesn't utilize anything beyond the local code base, and isn't compiled/processed by anything other than the local compiler, then the -Werror shouldn't be a problem. but i noticed -Werror was being used because some flags *were* causing warnings and so the build errored out (bug 54725). granted, this warning was valid and it's good that it broke (otherwise i might not have noticed as soon as i did), but in general, it's indeterminate warnings like that why distros want to turn off -Werror in their builds.