https://gcc.gnu.org/bugzilla/show_bug.cgi?id=82143
--- Comment #11 from janus at gcc dot gnu.org --- (In reply to Dominique d'Humieres from comment #9) > I don't know what fort is doing, but what is wrong with -freal-4-real-16? It is simply not equivalent to ifort's -real-size 128 / -r16, in the same sense that -freal-4-real-8 is not equivalent to ifort's -r8 (but -fdefault-real-8 is, which may be a reason why it's much more widely used than the other flags).