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Embed (3)
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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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