https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63765
--- Comment #8 from ro at CeBiTec dot Uni-Bielefeld.DE <ro at CeBiTec dot Uni-Bielefeld.DE> --- > --- Comment #7 from David Edelsohn <dje at gcc dot gnu.org> --- > Yes, the single objc failure existed before the patch. But I don't know if > *other* targets need _XOPEN_SOURCE=500. True, but now (end of stage1) is the time to find out. In most compilation environments, defining no feature test macros gives you the superset of everything available. Ultimately, it's Andrew's call. Rainer