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.IX Title "ExtUtils::Embed 3pm"
.TH ExtUtils::Embed 3pm 2025-07-25 "perl v5.42.0" "Perl Programmers Reference Guide"
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.nh
.SH NAME
ExtUtils::Embed \- Utilities for embedding Perl in C/C++ applications
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 3
\& perl \-MExtUtils::Embed \-e xsinit 
\& perl \-MExtUtils::Embed \-e ccopts 
\& perl \-MExtUtils::Embed \-e ldopts
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
\&\f(CW\*(C`ExtUtils::Embed\*(C'\fR provides utility functions for embedding a Perl interpreter
and extensions in your C/C++ applications.  
Typically, an application \fIMakefile\fR will invoke \f(CW\*(C`ExtUtils::Embed\*(C'\fR
functions while building your application.
.ie n .SH @EXPORT
.el .SH \f(CW@EXPORT\fP
.IX Header "@EXPORT"
\&\f(CW\*(C`ExtUtils::Embed\*(C'\fR exports the following functions:
.PP
\&\fBxsinit()\fR, \fBldopts()\fR, \fBccopts()\fR, \fBperl_inc()\fR, \fBccflags()\fR, 
\&\fBccdlflags()\fR, \fBxsi_header()\fR, \fBxsi_protos()\fR, \fBxsi_body()\fR
.SH FUNCTIONS
.IX Header "FUNCTIONS"
.IP \fBxsinit()\fR 4
.IX Item "xsinit()"
Generate C/C++ code for the XS initializer function.
.Sp
When invoked as \f(CW\`perl \-MExtUtils::Embed \-e xsinit \-\-\`\fR
the following options are recognized:
.Sp
\&\fB\-o\fR <output filename> (Defaults to \fBperlxsi.c\fR)
.Sp
\&\fB\-o STDOUT\fR will print to STDOUT.
.Sp
\&\fB\-std\fR (Write code for extensions that are linked with the current Perl.)
.Sp
Any additional arguments are expected to be names of modules
to generate code for.
.Sp
When invoked with parameters the following are accepted and optional:
.Sp
\&\f(CW\*(C`xsinit($filename,$std,[@modules])\*(C'\fR
.Sp
Where,
.Sp
\&\fR\f(CB$filename\fR\fB\fR is equivalent to the \fB\-o\fR option.
.Sp
\&\fR\f(CB$std\fR\fB\fR is boolean, equivalent to the \fB\-std\fR option.
.Sp
\&\fB[@modules]\fR is an array ref, same as additional arguments mentioned above.
.IP Examples 4
.IX Item "Examples"
.Vb 1
\& perl \-MExtUtils::Embed \-e xsinit \-\- \-o xsinit.c Socket
.Ve
.Sp
This will generate code with an \f(CW\*(C`xs_init\*(C'\fR function that glues the perl \f(CW\*(C`Socket::bootstrap\*(C'\fR function 
to the C \f(CW\*(C`boot_Socket\*(C'\fR function and writes it to a file named \fIxsinit.c\fR.
.Sp
Note that DynaLoader is a special case where it must call \f(CW\*(C`boot_DynaLoader\*(C'\fR directly.
.Sp
.Vb 1
\& perl \-MExtUtils::Embed \-e xsinit
.Ve
.Sp
This will generate code for linking with \f(CW\*(C`DynaLoader\*(C'\fR and
each static extension found in \f(CW$Config{static_ext}\fR.
The code is written to the default file name \fIperlxsi.c\fR.
.Sp
.Vb 2
\& perl \-MExtUtils::Embed \-e xsinit \-\- \-o xsinit.c \e
\&                            \-std DBI DBD::Oracle
.Ve
.Sp
Here, code is written for all the currently linked extensions along with code
for \f(CW\*(C`DBI\*(C'\fR and \f(CW\*(C`DBD::Oracle\*(C'\fR.
.Sp
If you have a working \f(CW\*(C`DynaLoader\*(C'\fR then there is rarely any need to statically link in any 
other extensions.
.IP \fBldopts()\fR 4
.IX Item "ldopts()"
Output arguments for linking the Perl library and extensions to your
application.
.Sp
When invoked as \f(CW\`perl \-MExtUtils::Embed \-e ldopts \-\-\`\fR
the following options are recognized:
.Sp
\&\fB\-std\fR
.Sp
Output arguments for linking the Perl library and any extensions linked
with the current Perl.
.Sp
\&\fB\-I\fR <path1:path2>
.Sp
Search path for ModuleName.a archives.  
Default path is \f(CW@INC\fR.
Library archives are expected to be found as 
\&\fI/some/path/auto/ModuleName/ModuleName.a\fR
For example, when looking for \fISocket.a\fR relative to a search path,
we should find \fIauto/Socket/Socket.a\fR
.Sp
When looking for \f(CW\*(C`DBD::Oracle\*(C'\fR relative to a search path,
we should find \fIauto/DBD/Oracle/Oracle.a\fR
.Sp
Keep in mind that you can always supply \fI/my/own/path/ModuleName.a\fR
as an additional linker argument.
.Sp
\&\fB\-\-\fR  <list of linker args>
.Sp
Additional linker arguments to be considered.
.Sp
Any additional arguments found before the \fB\-\-\fR token 
are expected to be names of modules to generate code for.
.Sp
When invoked with parameters the following are accepted and optional:
.Sp
\&\f(CW\*(C`ldopts($std,[@modules],[@link_args],$path)\*(C'\fR
.Sp
Where:
.Sp
\&\fR\f(CB$std\fR\fB\fR is boolean, equivalent to the \fB\-std\fR option.
.Sp
\&\fB[@modules]\fR is equivalent to additional arguments found before the \fB\-\-\fR token.
.Sp
\&\fB[@link_args]\fR is equivalent to arguments found after the \fB\-\-\fR token.
.Sp
\&\fR\f(CB$path\fR\fB\fR is equivalent to the \fB\-I\fR option.
.Sp
In addition, when ldopts is called with parameters, it will return the argument string
rather than print it to STDOUT.
.IP Examples 4
.IX Item "Examples"
.Vb 1
\& perl \-MExtUtils::Embed \-e ldopts
.Ve
.Sp
This will print arguments for linking with \f(CW\*(C`libperl\*(C'\fR and
extensions found in \f(CW$Config{static_ext}\fR.  This includes libraries
found in \f(CW$Config{libs}\fR and the first ModuleName.a library
for each extension that is found by searching \f(CW@INC\fR or the path
specified by the \fB\-I\fR option.
In addition, when ModuleName.a is found, additional linker arguments
are picked up from the \fIextralibs.ld\fR file in the same directory.
.Sp
.Vb 1
\& perl \-MExtUtils::Embed \-e ldopts \-\- \-std Socket
.Ve
.Sp
This will do the same as the above example, along with printing additional
arguments for linking with the \f(CW\*(C`Socket\*(C'\fR extension.
.Sp
.Vb 2
\& perl \-MExtUtils::Embed \-e ldopts \-\- \-std Msql \-\- \e
\&                        \-L/usr/msql/lib \-lmsql
.Ve
.Sp
Any arguments after the second \*(Aq\-\-\*(Aq token are additional linker
arguments that will be examined for potential conflict.  If there is no
conflict, the additional arguments will be part of the output.
.IP \fBperl_inc()\fR 4
.IX Item "perl_inc()"
For including perl header files this function simply prints:
.Sp
.Vb 1
\& \-I$Config{archlibexp}/CORE
.Ve
.Sp
So, rather than having to say:
.Sp
.Vb 1
\& perl \-MConfig \-e \*(Aqprint "\-I$Config{archlibexp}/CORE"\*(Aq
.Ve
.Sp
Just say:
.Sp
.Vb 1
\& perl \-MExtUtils::Embed \-e perl_inc
.Ve
.IP "\fBccflags()\fR, \fBccdlflags()\fR" 4
.IX Item "ccflags(), ccdlflags()"
These functions simply print \f(CW$Config\fR{ccflags} and \f(CW$Config\fR{ccdlflags}
.IP \fBccopts()\fR 4
.IX Item "ccopts()"
This function combines \f(CWperl_inc()\fR, \f(CWccflags()\fR and \f(CWccdlflags()\fR into one.
.IP \fBxsi_header()\fR 4
.IX Item "xsi_header()"
This function simply returns a string defining the same \f(CW\*(C`EXTERN_C\*(C'\fR macro as
\&\fIperlmain.c\fR along with #including \fIperl.h\fR and \fIEXTERN.h\fR.
.IP xsi_protos(@modules) 4
.IX Item "xsi_protos(@modules)"
This function returns a string of \f(CW\*(C`boot_$ModuleName\*(C'\fR prototypes for each \f(CW@modules\fR.
.IP xsi_body(@modules) 4
.IX Item "xsi_body(@modules)"
This function returns a string of calls to \f(CWnewXS()\fR that glue the module \fIbootstrap\fR
function to \fIboot_ModuleName\fR for each \f(CW@modules\fR.
.Sp
\&\f(CWxsinit()\fR uses the xsi_* functions to generate most of its code.
.SH EXAMPLES
.IX Header "EXAMPLES"
For examples on how to use \f(CW\*(C`ExtUtils::Embed\*(C'\fR for building C/C++ applications
with embedded perl, see perlembed.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
perlembed
.SH AUTHOR
.IX Header "AUTHOR"
Doug MacEachern <\f(CW\*(C`dougm@osf.org\*(C'\fR>
.PP
Based on ideas from Tim Bunce <\f(CW\*(C`Tim.Bunce@ig.co.uk\*(C'\fR> and
\&\fIminimod.pl\fR by Andreas Koenig <\f(CW\*(C`k@anna.in\-berlin.de\*(C'\fR> and Tim Bunce.
