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     F77(1)                                                     F77(1)

          f77 - Fortran 77 compiler

          f77 [ option ] ... file ...

          F77 is the UNIX Fortran 77 compiler.  It accepts several
          types of arguments:

          Arguments whose names end with `.f' are taken to be Fortran
          77 source programs; they are compiled, and each object pro-
          gram is left on the file in the current directory whose name
          is that of the source with `.o' substituted for '.f'.

          Arguments whose names end with `.r' or `.e' are taken to be
          Ratfor or EFL source programs, respectively; these are first
          transformed by the appropriate preprocessor, then compiled
          by f77.

          In the same way, arguments whose names end with `.c' or `.s'
          are taken to be C or assembly source programs and are com-
          piled or assembled, producing a `.o' file.

          The following options have the same meaning as in cc(1). See
          ld(1) for load-time options.

          -c   Suppress loading and produce `.o' files for each source

          -p   Prepare object files for profiling, see prof(1).

          -O   Invoke an object-code optimizer.

          -S   Compile the named programs, and leave the assembler-
               language output on corresponding files suffixed `.s'.
               (No `.o' is created.).

          -f   Use a floating point interpreter (for PDP11's that lack
               11/70-style floating point).

          -o output
               Name the final output file output instead of `a.out'.

          The following options are peculiar to f77.

               Compile DO loops that are performed at least once if
               reached.  (Fortran 77 DO loops are not performed at all
               if the upper limit is smaller than the lower limit.)

     F77(1)                                                     F77(1)

          -u   Make the default type of a variable `undefined' rather
               than using the default Fortran rules.

          -C   Compile code to check that subscripts are within
               declared array bounds.

          -w   Suppress all warning messages.  If the option is
               `-w66', only Fortran 66 compatibility warnings are sup-

          -F   Apply EFL and Ratfor preprocessor to relevant files,
               put the result in the file with the suffix changed to
               `.f', but do not compile.

          -m   Apply the M4 preprocessor to each `.r' or `.e' file
               before transforming it with the Ratfor or EFL prepro-

          extensively; the newer features have not.