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F77(3)		      User Contributed Perl Documentation		F77(3)

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! It	was originally developed to make
       building	and installation of the	PGPLOT module easier, which links to
       the pgplot Fortran graphics library. It is now used by a	numnber	of
       perl modules.

       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 submitted patches for new database
       entries for your	system at <https://github.com/PDLPorters/extutils-f77>

       Note the	default	on most	systems	is now to search for a generic 'GNU'
       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' '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	-MExtUtils::F77	-e 'print ExtUtils::F77->compiler, "\n"'
	 ...

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 are all class methods.

   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.

DEBUGGING
       To debug	this module, and/or get	more information about its workings,
       set $ExtUtils::F77::DEBUG to a true value. If set, it will "warn"
       various information about its operations.

       As of version 1.22, this	module will no longer print or warn if it is
       working normally.

SEE ALSO
       PDL (PDL::Minuit	and PDL::Slatec), PGPLOT

AUTHOR
       Karl Glazebrook,	with many other	contributions (see git repository at
       https://github.com/PDLPorters/extutils-f77)

perl v5.32.1			  2021-02-28				F77(3)

NAME | DESCRIPTION | SYNOPSIS | METHODS | DEBUGGING | SEE ALSO | AUTHOR

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