F77(1) General Commands Manual F77(1)
f77 - Fortran 77 compiler
f77 [ option ] ... file ...
F77 is the UNIX Fortran 77 compiler. It accepts several types of argu-
Arguments whose names end with `.f' are taken to be Fortran 77 source
programs; they are compiled, and each object program 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 compiled or assembled, pro-
ducing a `.o' file.
The following options have the same meaning as in cc(1). See ld(1) for
-c Suppress loading and produce `.o' files for each source file.
-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 cre-
-f Use a floating point interpreter (for PDP11's that lack
11/70-style floating point).
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.)
-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
-w Suppress all warning messages. If the option is `-w66', only
Fortran 66 compatibility warnings are suppressed.
-F Apply EFL and Ratfor preprocessor to relevant files, put the
result in the file with the suffix changed to `.f', but do not
-m Apply the M4 preprocessor to each `.r' or `.e' file before
transforming it with the Ratfor or EFL preprocessor.
-Ex Use the string x as an EFL option in processing `.e' files.
-Rx Use the string x as a Ratfor option in processing `.r' files.
Other arguments are taken to be either loader option arguments, or
F77-compatible object programs, typically produced by an earlier run,
or perhaps libraries of F77-compatible routines. These programs,
together with the results of any compilations specified, are loaded (in
the order given) to produce an executable program with name `a.out'.
file.[fresc] input file
file.o object file
a.out loaded output
/lib/c1 pass 2
/lib/c2 optional optimizer
/usr/lib/libF77.a intrinsic function library
/usr/lib/libI77.a Fortran I/O library
/lib/libc.a C library, see section 3
S. I. Feldman, P. J. Weinberger, A Portable Fortran 77 Compiler
prof(1), cc(1), ld(1)
The diagnostics produced by f77 itself are intended to be self-explana-
tory. Occasional messages may be produced by the loader.
The Fortran 66 subset of the language has been exercised extensively;
the newer features have not.