NAME

       ExtUtils::Embed - Utilities for embedding Perl in C/C++ applications

SYNOPSIS

        perl -MExtUtils::Embed -e xsinit
        perl -MExtUtils::Embed -e ccopts
        perl -MExtUtils::Embed -e ldopts

DESCRIPTION

       ExtUtils::Embed provides utility functions for embedding a Perl interpreter and extensions
       in your C/C++ applications.  Typically, an application Makefile will invoke
       ExtUtils::Embed functions while building your application.

       Note that on Debian systems the libperl-dev package is required for compiling applications
       which embed an interpreter.

@EXPORT

       ExtUtils::Embed exports the following functions:

       xsinit(), ldopts(), ccopts(), perl_inc(), ccflags(), ccdlflags(), xsi_header(),
       xsi_protos(), xsi_body()

FUNCTIONS

       xsinit()
           Generate C/C++ code for the XS initializer function.

           When invoked as "`perl -MExtUtils::Embed -e xsinit --`" the following options are
           recognized:

           -o <output filename> (Defaults to perlxsi.c)

           -o STDOUT will print to STDOUT.

           -std (Write code for extensions that are linked with the current Perl.)

           Any additional arguments are expected to be names of modules to generate code for.

           When invoked with parameters the following are accepted and optional:

           "xsinit($filename,$std,[@modules])"

           Where,

           $filename is equivalent to the -o option.

           $std is boolean, equivalent to the -std option.

           [@modules] is an array ref, same as additional arguments mentioned above.

       Examples
            perl -MExtUtils::Embed -e xsinit -- -o xsinit.c Socket

           This will generate code with an xs_init function that glues the perl Socket::bootstrap
           function to the C boot_Socket function and writes it to a file named xsinit.c.

           Note that DynaLoader is a special case where it must call boot_DynaLoader directly.

            perl -MExtUtils::Embed -e xsinit

           This will generate code for linking with DynaLoader and each static extension found in
           $Config{static_ext}.  The code is written to the default file name perlxsi.c.

            perl -MExtUtils::Embed -e xsinit -- -o xsinit.c -std DBI DBD::Oracle

           Here, code is written for all the currently linked extensions along with code for DBI
           and DBD::Oracle.

           If you have a working DynaLoader then there is rarely any need to statically link in
           any other extensions.

       ldopts()
           Output arguments for linking the Perl library and extensions to your application.

           When invoked as "`perl -MExtUtils::Embed -e ldopts --`" the following options are
           recognized:

           -std

           Output arguments for linking the Perl library and any extensions linked with the
           current Perl.

           -I <path1:path2>

           Search path for ModuleName.a archives.  Default path is @INC.  Library archives are
           expected to be found as /some/path/auto/ModuleName/ModuleName.a For example, when
           looking for Socket.a relative to a search path, we should find auto/Socket/Socket.a

           When looking for DBD::Oracle relative to a search path, we should find
           auto/DBD/Oracle/Oracle.a

           Keep in mind that you can always supply /my/own/path/ModuleName.a as an additional
           linker argument.

           --  <list of linker args>

           Additional linker arguments to be considered.

           Any additional arguments found before the -- token are expected to be names of modules
           to generate code for.

           When invoked with parameters the following are accepted and optional:

           "ldopts($std,[@modules],[@link_args],$path)"

           Where:

           $std is boolean, equivalent to the -std option.

           [@modules] is equivalent to additional arguments found before the -- token.

           [@link_args] is equivalent to arguments found after the -- token.

           $path is equivalent to the -I option.

           In addition, when ldopts is called with parameters, it will return the argument string
           rather than print it to STDOUT.

       Examples
            perl -MExtUtils::Embed -e ldopts

           This will print arguments for linking with libperl and extensions found in
           $Config{static_ext}.  This includes libraries found in $Config{libs} and the first
           ModuleName.a library for each extension that is found by searching @INC or the path
           specified by the -I option.  In addition, when ModuleName.a is found, additional
           linker arguments are picked up from the extralibs.ld file in the same directory.

            perl -MExtUtils::Embed -e ldopts -- -std Socket

           This will do the same as the above example, along with printing additional arguments
           for linking with the Socket extension.

            perl -MExtUtils::Embed -e ldopts -- -std Msql -- -L/usr/msql/lib -lmsql

           Any arguments after the second '--' token are additional linker arguments that will be
           examined for potential conflict.  If there is no conflict, the additional arguments
           will be part of the output.

       perl_inc()
           For including perl header files this function simply prints:

            -I$Config{archlibexp}/CORE

           So, rather than having to say:

            perl -MConfig -e 'print "-I$Config{archlibexp}/CORE"'

           Just say:

            perl -MExtUtils::Embed -e perl_inc

       ccflags(), ccdlflags()
           These functions simply print $Config{ccflags} and $Config{ccdlflags}

       ccopts()
           This function combines perl_inc(), ccflags() and ccdlflags() into one.

       xsi_header()
           This function simply returns a string defining the same EXTERN_C macro as perlmain.c
           along with #including perl.h and EXTERN.h.

       xsi_protos(@modules)
           This function returns a string of boot_$ModuleName prototypes for each @modules.

       xsi_body(@modules)
           This function returns a string of calls to newXS() that glue the module bootstrap
           function to boot_ModuleName for each @modules.

           xsinit() uses the xsi_* functions to generate most of its code.

EXAMPLES

       For examples on how to use ExtUtils::Embed for building C/C++ applications with embedded
       perl, see perlembed.

SEE ALSO

       perlembed

AUTHOR

       Doug MacEachern <dougm@osf.org>

       Based on ideas from Tim Bunce <Tim.Bunce@ig.co.uk> and minimod.pl by Andreas Koenig
       <k@anna.in-berlin.de> and Tim Bunce.