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perl_mlb
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 / ExtUtils::Liblist
Ilya Zakharevich

NAME

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

SYNOPSIS

require ExtUtils::Liblist;

ExtUtils::Liblist::ext($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.

Dependent libraries can be linked in one of three ways:

  • For static extensions

    by the ld command when the perl binary is linked with the extension library. See EXTRALIBS below.

  • For dynamic extensions

    by the ld command when the shared object is built/linked. See LDLOADLIBS below.

  • For dynamic extensions

    by the DynaLoader when the shared object is loaded. See BSLOADLIBS below.

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.

SEE ALSO

ExtUtils::MakeMaker