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.\" ========================================================================
.\"
.IX Title "F77 3pm"
.TH F77 3pm "2019-01-12" "perl v5.28.1" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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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! It was originally
developed to make building and installation of the \s-1PGPLOT\s0 module easier,
which links to the pgplot Fortran graphics library. It is now used by a numnber
of perl modules.
.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 submitted patches for new database entries for
your system at <https://github.com/PDLPorters/extutils\-f77>
.PP
Note the default on most systems is now to search for a generic '\s-1GNU\s0' compiler
which can be gfortran, g77, g95 or fort77 (in that order based on usage) 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 \-MExtUtils::F77 \-e \*(Aqprint ExtUtils::F77\->compiler, "\en"\*(Aq
\&  ...
.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 are all class methods.
.SS "runtime"
.IX Subsection "runtime"
Returns a list of F77 runtime libraries.
.PP
.Vb 1
\&  $fortranlibs = ExtUtils::F77\->runtime;
.Ve
.SS "runtimeok"
.IX Subsection "runtimeok"
Returns \s-1TRUE\s0 only if runtime libraries have been found successfully.
.SS "trail_"
.IX Subsection "trail_"
Returns true if F77 names have trailing underscores.
.SS "compiler"
.IX Subsection "compiler"
Returns command to execute the compiler (e.g. 'f77').
.SS "cflags"
.IX Subsection "cflags"
Returns compiler flags.
.SS "testcompiler"
.IX Subsection "testcompiler"
Test to see if compiler actually works.
.SH "DEBUGGING"
.IX Header "DEBUGGING"
To debug this module, and/or get more information about its workings,
set \f(CW$ExtUtils::F77::DEBUG\fR to a true value. If set, it will \f(CW\*(C`warn\*(C'\fR
various information about its operations.
.PP
As of version 1.22, this module will no longer print or warn if it is
working normally.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\s-1PDL\s0 (PDL::Minuit and PDL::Slatec), \s-1PGPLOT\s0
.SH "AUTHOR"
.IX Header "AUTHOR"
Karl Glazebrook, with many other contributions (see git repository at https://github.com/PDLPorters/extutils\-f77)