Paul Eggert <eggert@xxxxxxxxxxx> writes: > > The problem is that plain "cc" mishandles \x escapes in strings. Yep. And the worst thing about it was that it happens silently. I didn't pay attention to what -std1 actually does (except to note gmp seemed ok with it). -std1 was just what was in the options iterated, I only aimed to make the test program demand that '\x00' works.