Has anyone come across a Fortran 77 emulator or compiler for iOS devices?
Perhaps it's best done with a pre-compiler translating Fortran to C (and integrate that into Xcode as a separate build step). One such tool is e.g. http://www.greatmigrations.com/tools_gmFortran.aspx
Maybe one can also have a look at the gnu fortran compiler, as far as I remember it also started out as a precompiler translating Fortran to C. http://gcc.gnu.org/fortran/