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# ExtUtils::xsubpp

- NAME
- SYNOPSIS
- DESCRIPTION
- OPTIONS
- ENVIRONMENT
- AUTHOR
- MODIFICATION HISTORY
- SEE ALSO

## NAME

xsubpp - compiler to convert Perl XS code into C code

## SYNOPSIS

xsubpp [-v] [-C++] [-except] [-s pattern] [-prototypes] [-noversioncheck] [-nolinenumbers] [-nooptimize] [-typemap typemap] ... file.xs

## DESCRIPTION

This compiler is typically run by the makefiles created by the ExtUtils::MakeMaker manpage.

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

## OPTIONS

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

-C++
  Adds ``extern "C"'' to the C code.
-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.
-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 the perlguts manpage). 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.

## ENVIRONMENT

No environment variables are used.

## AUTHOR

Larry Wall

## MODIFICATION HISTORY

See the file `changes.pod`.

## SEE ALSO

perl(1), perlxs(1), perlxstut(1)

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