Is it safe to rerun make bootstrap after changing GCC source?
Say if the first bootstrap succeeds and I then change a single GCC .c file and rerun make bootstrap, am I guaranteed to see the same fallout of the change as I would if I did a pristine build in a clean directory? I have been assuming this is safe and so after each tweak to a patch I work on I rerun make bootstrap in the same build directory. It can speed things up quite a bit. But the recent bootstrap breakage (PR 89980) makes me wonder if it is, in fact, safe. I can see the broken bootstrap today in a clean build yet the bootstrap I did just before checking in the change went fine. Martin
