https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64727
--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> --- If stage1 fails, then it is not miscompilation of the compiler itself (or it would be miscompilation by your system compiler instead). So no *.o bisection is needed. That said, I don't see what commit in that range might be related.
