https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66765
--- Comment #8 from Dominique d'Humieres <dominiq at lps dot ens.fr> --- > Any of the Fortran FE options appearing in a link command likely cause an > error. Apparently it more complicated than that: [Book15] f90/bug% gcc ya_sincos.c -fdump-fortran-original cc1: error: unrecognized command line option '-fdump-fortran-original' but [Book15] f90/bug% gcc ya_sincos.c -fblah-blah gcc: error: unrecognized command line option '-fblah-blah' nothing to do with gfortran FE, and [Book15] f90/bug% gcc ya_sincos.c -fdefault-integer-8 cc1: warning: command line option '-fdefault-integer-8' is valid for Fortran but not for C
