NAME

       ExtUtils::F77 - Simple interface to F77 libs

DESCRIPTION

       This module tries to figure out how to link C programs with Fortran subroutines on your
       system. Basically one must add a list of Fortran runtime libraries. The problem is their
       location and name varies with each OS/compiler combination!

       This module tries to implement a simple 'rule-of-thumb' database for various flavours of
       UNIX systems.  A simple self-documenting Perl database of knowledge/code for figuring out
       how to link for various combinations of OS and compiler is embedded in the modules Perl
       code. Please help save the world by sending database entries for your system to
       karl_pgplot@mac.com

       Note the default on most systems is now to search for a generic 'GNU' compiler which can
       be g77, gfortran or g95 and then find the appropriate link libraries automatically. (This
       is the 'Generic' 'GNU' database entry in the code.)

       The library list which the module returns can be explicitly overridden by setting the
       environment variable F77LIBS, e.g.

         % setenv F77LIBS "-lfoo -lbar"
         % perl Makefile.PL
         ...

SYNOPSIS

         use ExtUtils::F77;               # Automatic guess
         use ExtUtils::F77 qw(sunos);     # Specify system
         use ExtUtils::F77 qw(linux g77); # Specify system and compiler
         $fortranlibs = ExtUtils::F77->runtime;

METHODS

       The following methods are provided:

       ·   runtime

           Returns a list of F77 runtime libraries.

             $fortranlibs = ExtUtils::F77->runtime;

       ·   runtimeok

           Returns TRUE only if runtime libraries have been found successfully.

       ·   trail_

           Returns true if F77 names have trailing underscores.

       ·   compiler

           Returns command to execute the compiler (e.g. 'f77').

       ·   cflags

           Returns compiler flags.

       ·   testcompiler

           Test to see if compiler actually works.

       More methods  will probably be added in the future.

AUTHOR

       Karl Glazebrook (karlglazebrook@mac.com).