f77 - FORTRAN 77 compiler
Oracle Developer Studio software no longer includes a separate FORTRAN 77 compiler, f77. Recent releases migrated many FORTRAN 77 features into the Fortran 95 compiler, f95. Much of the functionality of the f77 compiler is now available with the Fortran 95 compiler.
With current Oracle Developer Studio compiler releases, the f77 command calls the f95 compiler with an appropriate set of defaults:
f95 -f77 -ftrap=%none
If you are also compiling with the -fast flag, add -ftrap=%none after -fast to retain Fortran 77's trapping behavior on arithmetic exceptions. -fast sets the trapping mode to "common".
f77 -fast -ftrap=%none
Invoking the f77 script issues a message to alert you to the fact that you are using the f95 compiler in -f77 compatibility mode. You can disable this message by adding -errtags=INVOKE to the command line.
See the f95 (1) man page for more information.