Compiling XL Fortran Version 2 programs

When used to compile .f, .F, .f77, or .F77 files, xlf maintains, wherever possible, compatibility with existing programs by using the same I/O formats as earlier versions of XL Fortran and some implementation behavior compatible with FORTRAN 77.

If the configuration file has not been customized, f77 is identical to xlf when xlf is used to compile the .f, .F, .f77, or .F77 files.

You may find that you need to continue using these commands for compatibility with existing makefiles and build environments. However, be aware that programs that you compile with these commands may not conform to the newer standard in subtle ways.