https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119843
--- Comment #6 from Jakub Jelinek <jakub at gcc dot gnu.org> --- rpm adds that in Fedora/RHEL and guess some distros based on that. You need to actively remove it for building of gcc, or at least arrange it doesn't apply to anything but what is built with the system gcc and leave everything built by the newly built compiler without it. E.g. Fedora gcc.spec does that by %undefine _annotated_build
