https://gcc.gnu.org/bugzilla/show_bug.cgi?id=119430
--- Comment #19 from Alexandre Oliva <aoliva at gcc dot gnu.org> --- --with-specs are quite useful to change compiler defaults, but I don't suppose you'll want to change them. I'd have added the options to BOOT_CFLAGS if that was as easy as --with-specs for a test build ;-) But you probably already know that ;-)
