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NAME

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



SYNOPSIS
      perl -MExtUtils::Embed -e xsinit
      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.



@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, 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.a,
          DynaLoader 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 -- DynaLoader

          This will print arguments for linking with just the
          DynaLoader extension and libperl.a.

           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
          it's code.



EXAMPLES
     For examples on how to use ExtUtils::Embed for building
     C/C++ applications with embedded perl, see the eg/ directory
     and the perlembed manpage.



SEE ALSO
     the perlembed manpage



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.









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