https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81906
--- Comment #5 from Vadim Zeitlin <vz-gcc at zeitlins dot org> --- Yes, I did find this documentation myself in the meanwhile and I agree that you're formally correct, just as gcc developers are formally correct in the long discussion at #34678 (which I really wouldn't want to reopen), but this is not very helpful in practice because this information is completely undiscoverable, i.e. you can only find it if you already know what you're looking for (or enjoy reading compiler optimization options documentation as a hobby, of course). Perhaps you could consider this as a QoI issue, but it would be really great if gcc could give a warning if the code tries to use fesetround() without -frounding-math being on.
