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.\" ========================================================================
.\"
.IX Title "F77 3pm"
.TH F77 3pm "2016-10-29" "perl v5.24.1" "User Contributed Perl Documentation"
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.SH "NAME"
ExtUtils::F77 \- Simple interface to F77 libs
.SH "DESCRIPTION"
.IX Header "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!
.PP
This module tries to implement a simple  
\&'rule\-of\-thumb' database for various flavours of \s-1UNIX\s0 systems.
A simple self-documenting Perl database of knowledge/code
for figuring out how to link for various combinations of \s-1OS\s0 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
.PP
Note the default on most systems is now to search for a generic '\s-1GNU\s0' compiler
which can be g77, gfortran or g95 and then find the appropriate link
libraries automatically. (This is the 'Generic' '\s-1GNU\s0' database entry
in the code.)
.PP
The library list which the module returns 
can be explicitly overridden by setting the environment 
variable F77LIBS, e.g.
.PP
.Vb 3
\&  % setenv F77LIBS "\-lfoo \-lbar"
\&  % perl Makefile.PL
\&  ...
.Ve
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 4
\&  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;
.Ve
.SH "METHODS"
.IX Header "METHODS"
The following methods are provided:
.IP "\(bu" 4
\&\fBruntime\fR
.Sp
Returns a list of F77 runtime libraries.
.Sp
.Vb 1
\&  $fortranlibs = ExtUtils::F77\->runtime;
.Ve
.IP "\(bu" 4
\&\fBruntimeok\fR
.Sp
Returns \s-1TRUE\s0 only if runtime libraries have been found successfully.
.IP "\(bu" 4
\&\fBtrail_\fR
.Sp
Returns true if F77 names have trailing underscores.
.IP "\(bu" 4
\&\fBcompiler\fR
.Sp
Returns command to execute the compiler (e.g. 'f77').
.IP "\(bu" 4
\&\fBcflags\fR
.Sp
Returns compiler flags.
.IP "\(bu" 4
\&\fBtestcompiler\fR
.Sp
Test to see if compiler actually works.
.PP
More methods  will probably be added in the future.
.SH "AUTHOR"
.IX Header "AUTHOR"
Karl Glazebrook (karlglazebrook@mac.com).