XSUBPP(1)              Perl Programmers Reference Guide              XSUBPP(1)



NAME
       xsubpp - compiler to convert Perl XS code into C code

SYNOPSIS
       xsubpp [-v] [-except] [-s pattern] [-prototypes] [-noversioncheck]
       [-nolinenumbers] [-nooptimize] [-typemap typemap] [-output filename]...
       file.xs

DESCRIPTION
       This compiler is typically run by the makefiles created by
       ExtUtils::MakeMaker or by Module::Build or other Perl module build
       tools.

       xsubpp 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.

       The compiler will search for typemap files called typemap.  It will use
       the following search path to find default typemaps, with the rightmost
       typemap taking precedence.

               ../../../typemap:../../typemap:../typemap:typemap

       It will also use a default typemap installed as "ExtUtils::typemap".

OPTIONS
       Note that the "XSOPT" MakeMaker option may be used to add these options
       to any makefiles generated by MakeMaker.

       -hiertype
            Retains '::' in type names so that C++ hierarchical types can be
            mapped.

       -except
            Adds exception handling stubs to the C code.

       -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.

       -output filename
            Specifies the name of the output file to generate.  If no file is
            specified, output will be written to standard output.

       -v   Prints the xsubpp version number to standard output, then exits.

       -prototypes
            By default xsubpp will not automatically generate prototype code
            for all xsubs. This flag will enable prototypes.

       -noversioncheck
            Disables the run time test that determines if the object file
            (derived from the ".xs" file) and the ".pm" files have the same
            version number.

       -nolinenumbers
            Prevents the inclusion of '#line' directives in the output.

       -nooptimize
            Disables certain optimizations.  The only optimization that is
            currently affected is the use of targets by the output C code (see
            perlguts).  This may significantly slow down the generated code,
            but this is the way xsubpp of 5.005 and earlier operated.

       -noinout
            Disable recognition of "IN", "OUT_LIST" and "INOUT_LIST"
            declarations.

       -noargtypes
            Disable recognition of ANSI-like descriptions of function
            signature.

       -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.

       -s=... or -strip=...
            This option is obscure and discouraged.

            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
            "CODE" or "PPCODE" blocks.  For example, the XS:

              void foo_bar(int i);

            when "xsubpp" is invoked with "-s foo_" will install a "foo_bar"
            function in Perl, but really call bar(i) 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.

ENVIRONMENT
       No environment variables are used.

AUTHOR
       Originally by Larry Wall.  Turned into the "ExtUtils::ParseXS" module
       by Ken Williams.

MODIFICATION HISTORY
       See the file Changes.

SEE ALSO
       perl(1), perlxs(1), perlxstut(1), ExtUtils::ParseXS



perl v5.20.2                      2016-02-26                         XSUBPP(1)
