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PROGRAM:
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.
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