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Current File : /usr/local/lp/sonarperl/man/man1/xsubpp.1
.\" -*- mode: troff; coding: utf-8 -*-
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.\" ========================================================================
.\"
.IX Title "XSUBPP 1"
.TH XSUBPP 1 2025-02-14 "perl v5.38.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
xsubpp \- compiler to convert Perl XS code into C code
.SH SYNOPSIS
.IX Header "SYNOPSIS"
\&\fBxsubpp\fR [\fB\-v\fR] [\fB\-except\fR] [\fB\-s pattern\fR] [\fB\-prototypes\fR] [\fB\-noversioncheck\fR] [\fB\-nolinenumbers\fR] [\fB\-nooptimize\fR] [\fB\-typemap typemap\fR] [\fB\-output filename\fR]... file.xs
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This compiler is typically run by the makefiles created by ExtUtils::MakeMaker
or by Module::Build or other Perl module build tools.
.PP
\&\fIxsubpp\fR will compile XS code into C code by embedding the constructs
necessary to let C functions manipulate Perl values and creates the glue
necessary to let Perl access those functions.  The compiler uses typemaps to
determine how to map C function parameters and variables to Perl values.
.PP
The compiler will search for typemap files called \fItypemap\fR.  It will use
the following search path to find default typemaps, with the rightmost
typemap taking precedence.
.PP
.Vb 1
\&        ../../../typemap:../../typemap:../typemap:typemap
.Ve
.PP
It will also use a default typemap installed as \f(CW\*(C`ExtUtils::typemap\*(C'\fR.
.SH OPTIONS
.IX Header "OPTIONS"
Note that the \f(CW\*(C`XSOPT\*(C'\fR MakeMaker option may be used to add these options to
any makefiles generated by MakeMaker.
.IP \fB\-hiertype\fR 5
.IX Item "-hiertype"
Retains '::' in type names so that C++ hierarchical types can be mapped.
.IP \fB\-except\fR 5
.IX Item "-except"
Adds exception handling stubs to the C code.
.IP "\fB\-typemap typemap\fR" 5
.IX Item "-typemap typemap"
Indicates that a user-supplied typemap should take precedence over the
default typemaps.  This option may be used multiple times, with the last
typemap having the highest precedence.
.IP "\fB\-output filename\fR" 5
.IX Item "-output filename"
Specifies the name of the output file to generate.  If no file is
specified, output will be written to standard output.
.IP \fB\-v\fR 5
.IX Item "-v"
Prints the \fIxsubpp\fR version number to standard output, then exits.
.IP \fB\-prototypes\fR 5
.IX Item "-prototypes"
By default \fIxsubpp\fR will not automatically generate prototype code for
all xsubs. This flag will enable prototypes.
.IP \fB\-noversioncheck\fR 5
.IX Item "-noversioncheck"
Disables the run time test that determines if the object file (derived
from the \f(CW\*(C`.xs\*(C'\fR file) and the \f(CW\*(C`.pm\*(C'\fR files have the same version
number.
.IP \fB\-nolinenumbers\fR 5
.IX Item "-nolinenumbers"
Prevents the inclusion of '#line' directives in the output.
.IP \fB\-nooptimize\fR 5
.IX Item "-nooptimize"
Disables certain optimizations.  The only optimization that is currently
affected is the use of \fItarget\fRs by the output C code (see perlguts).
This may significantly slow down the generated code, but this is the way
\&\fBxsubpp\fR of 5.005 and earlier operated.
.IP \fB\-noinout\fR 5
.IX Item "-noinout"
Disable recognition of \f(CW\*(C`IN\*(C'\fR, \f(CW\*(C`OUT_LIST\*(C'\fR and \f(CW\*(C`INOUT_LIST\*(C'\fR declarations.
.IP \fB\-noargtypes\fR 5
.IX Item "-noargtypes"
Disable recognition of ANSI-like descriptions of function signature.
.IP \fB\-C++\fR 5
.IX Item "-C++"
Currently doesn't do anything at all.  This flag has been a no-op for
many versions of perl, at least as far back as perl5.003_07.  It's
allowed here for backwards compatibility.
.IP "\fB\-s=...\fR or \fB\-strip=...\fR" 5
.IX Item "-s=... or -strip=..."
\&\fIThis option is obscure and discouraged.\fR
.Sp
If specified, the given string will be stripped off from the beginning
of the C function name in the generated XS functions (if it starts with that prefix).
This only applies to XSUBs without \f(CW\*(C`CODE\*(C'\fR or \f(CW\*(C`PPCODE\*(C'\fR blocks.
For example, the XS:
.Sp
.Vb 1
\&  void foo_bar(int i);
.Ve
.Sp
when \f(CW\*(C`xsubpp\*(C'\fR is invoked with \f(CW\*(C`\-s foo_\*(C'\fR will install a \f(CW\*(C`foo_bar\*(C'\fR
function in Perl, but really call \f(CWbar(i)\fR in C. Most of the time,
this is the opposite of what you want and failure modes are somewhat
obscure, so please avoid this option where possible.
.SH ENVIRONMENT
.IX Header "ENVIRONMENT"
No environment variables are used.
.SH AUTHOR
.IX Header "AUTHOR"
Originally by Larry Wall.  Turned into the \f(CW\*(C`ExtUtils::ParseXS\*(C'\fR module
by Ken Williams.
.SH "MODIFICATION HISTORY"
.IX Header "MODIFICATION HISTORY"
See the file \fIChanges\fR.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBperl\fR\|(1), \fBperlxs\fR\|(1), \fBperlxstut\fR\|(1), ExtUtils::ParseXS
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