https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82600
--- Comment #8 from Andi <andi at mozilla dot com> --- (In reply to Jonathan Wakely from comment #7) > (In reply to Andi from comment #0) > > Building firefox with gcc8 trunk i get this error: > > This is a warning, not an error. > > If you use -Werror to cause compilation to fail that's your choice, but it's > still just a warning as far as we're concerned. > > If you can't build because you choose to use -Werror then don't use -Werror. Indeed the build was ran with -Werror since we wanted to see what are our blockers.