https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100207
--- Comment #12 from David Malcolm <dmalcolm at gcc dot gnu.org> --- Is that the default /etc/makepkg.conf, or did you hand-edit it? (i.e is this something that all AUR users are going to run into, or just you?) Clearly the "-Werror=format-security" is not compatible with building libgccjit; I think "-fexceptions" is probably not a good idea either.