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NAME

ExtUtils::Liblist - determine libraries to use and how to use them


SYNOPSIS

require ExtUtils::Liblist;

ExtUtils::Liblist::ext($self, $potential_libs, $verbose);


DESCRIPTION

This utility takes a list of libraries in the form -llib1 -llib2 -llib3 and prints out lines suitable for inclusion in an extension Makefile. Extra library paths may be included with the form -L/another/path this will affect the searches for all subsequent libraries.

It returns an array of four scalar values: EXTRALIBS, BSLOADLIBS, LDLOADLIBS, and LD_RUN_PATH. Some of these don't mean anything on VMS and Win32. See the details about those platform specifics below.

Dependent libraries can be linked in one of three ways:


EXTRALIBS

List of libraries that need to be linked with when linking a perl binary which includes this extension Only those libraries that actually exist are included. These are written to a file and used when linking perl.


LDLOADLIBS and LD_RUN_PATH

List of those libraries which can or must be linked into the shared library when created using ld. These may be static or dynamic libraries. LD_RUN_PATH is a colon separated list of the directories in LDLOADLIBS. It is passed as an environment variable to the process that links the shared library.


BSLOADLIBS

List of those libraries that are needed but can be linked in dynamically at run time on this platform. SunOS/Solaris does not need this because ld records the information (from LDLOADLIBS) into the object file. This list is used to create a .bs (bootstrap) file.


PORTABILITY

This module deals with a lot of system dependencies and has quite a few architecture specific ifs in the code.


VMS implementation

The version of ext() which is executed under VMS differs from the Unix-OS/2 version in several respects:

In addition, an attempt is made to recognize several common Unix library names, and filter them out or convert them to their VMS equivalents, as appropriate.

In general, the VMS version of ext() should properly handle input from extensions originally designed for a Unix or VMS environment. If you encounter problems, or discover cases where the search could be improved, please let us know.


Win32 implementation

The version of ext() which is executed under Win32 differs from the Unix-OS/2 version in several respects:


SEE ALSO

MakeMaker


DISCLAIMER

We are painfully aware that these documents may contain incorrect links and misformatted HTML. Such bugs lie in the automatic translation process that automatically created the hundreds and hundreds of separate documents that you find here. Please do not report link or formatting bugs, because we cannot fix per-document problems. The only bug reports that will help us are those that supply working patches to the installhtml or pod2html programs, or to the Pod::HTML module itself, for which I and the entire Perl community will shower you with thanks and praises.

If rather than formatting bugs, you encounter substantive content errors in these documents, such as mistakes in the explanations or code, please use the perlbug utility included with the Perl distribution.

--Tom Christiansen, Perl Documentation Compiler and Editor


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