F77(1) — UNIX Programmer’s Manual

NAME

f77 − FORTRAN compiler

SYNOPSIS

f77 [-o ofile] [-i] [-c] [-u] [-v] file ...

DESCRIPTION

f77, the FORTRAN compiler, accepts a list of FORTRAN source files and various intermediate texts contained in the list of files specified by file and puts the resulting executable object module in a.out (but see the -o option, described below).

In order to understand the use of f77, the reader must first understand the steps which the compiler goes through in order to turn a FORTRAN source program into an executable object file.

The FORTRAN compiler generates several intermediate files on the way to generating the final executable file. The first phase of the compiler generates an intermediate file, of the same name as the source file, but with a .i suffix. This intermediate file is destined for processing by the code generator.

The code generator is the second phase of the process. The output of the code generator is a file with the same name as the source file, but with a suffix of .obj. The *.obj file is the input to the next phase, called ulinker.

The ulinker phase of the compilation process converts the .obj file into a UNIX-style object file with a .o suffix. This file can then be processed by the UNIX loader utility, ld.

Finally, the ld utility produces the final executable code file.

When using f77, any combination of FORTRAN source files (each having a .for suffix) can be combined with FORTRAN or Pascal intermediate files (each having a .i suffix), FORTRAN or Pascal object code files (each having a .obj suffix), and UNIX object files (each having a .o suffix). When the compilation completes successfully, the result of the combination of all those files is placed in the file a.out or in the file specified by the -o option.

The -o option, if given, specifies that the file ofile (runnable file) whose name follows the option is the file to receive the final executable code. If the -o option is not specified, the resultant executable file is placed in the file a.out.

If the -i option is given, the FORTRAN intermediate code (the result of running /lib/fortran) is placed in a file of the same name as the source file, but with a suffix of .i appended. The compilation then terminates.

If the -c option is given, the FORTRAN unlinked object code (the result of running /lib/code) is placed in a file of the same name as the source file, but with a suffix of

If the -u option is given, the linked object code (the result of running /lib/ulinker) is placed in a file of the same name as the source file, but with a suffix of

The -v (for verbose) option makes f77 display a running progress report as it compiles.

If only one file argument is supplied on the command line, then all the intermediate files (.i, .obj, .o) are removed at the end of the compilation. If multiple file arguments are typed on the command line, any existing intermediate files are not removed.

EXAMPLES

f77 prog1.for

compiles prog1.for and puts the resulting object module in a.out.

f77 -o frammis prog2.for prog3.obj

compiles the FORTRAN program called prog2.for and links the result with the object file prog3.obj. The result of the compilation is placed in the output file called frammis.

FILES

*.for         FORTRAN source
*.i           Intermediate code
*.obj         Compiled unlinked f77 object
*.o           Compiled unlinked UNIX object
/lib/ftnlib.obj
/lib/paslib.obj
/lib/fortran
/lib/code
/lib/ulinker
/lib/ftncterrs
/lib/ftnrterrs