Provided by: libextutils-depends-perl_0.405-1_all 
NAME
ExtUtils::Depends - Easily build XS extensions that depend on XS extensions
SYNOPSIS
use ExtUtils::Depends;
$package = new ExtUtils::Depends ('pkg::name', 'base::package')
# set the flags and libraries to compile and link the module
$package->set_inc("-I/opt/blahblah");
$package->set_libs("-lmylib");
# add a .c and an .xs file to compile
$package->add_c('code.c');
$package->add_xs('module-code.xs');
# add the typemaps to use
$package->add_typemaps("typemap");
# install some extra data files and headers
$package->install (qw/foo.h data.txt/);
# save the info
$package->save_config('Files.pm');
WriteMakefile(
'NAME' => 'Mymodule',
$package->get_makefile_vars()
);
DESCRIPTION
This module tries to make it easy to build Perl extensions that use functions and typemaps
provided by other perl extensions. This means that a perl extension is treated like a
shared library that provides also a C and an XS interface besides the perl one.
This works as long as the base extension is loaded with the RTLD_GLOBAL flag (usually done
with a
sub dl_load_flags {0x01}
in the main .pm file) if you need to use functions defined in the module.
The basic scheme of operation is to collect information about a module in the instance,
and then store that data in the Perl library where it may be retrieved later. The object
can also reformat this information into the data structures required by
ExtUtils::MakeMaker's WriteMakefile function.
For information on how to make your module fit into this scheme, see "hashref =
ExtUtils::Depends::load (name)".
When creating a new Depends object, you give it a name, which is the name of the module
you are building. You can also specify the names of modules on which this module
depends. These dependencies will be loaded automatically, and their typemaps, header
files, etc merged with your new object's stuff. When you store the data for your object,
the list of dependencies are stored with it, so that another module depending on your
needn't know on exactly which modules yours depends.
For example:
Gtk2 depends on Glib
Gnome2::Canvas depends on Gtk2
ExtUtils::Depends->new ('Gnome2::Canvas', 'Gtk2');
this command automatically brings in all the stuff needed
for Glib, since Gtk2 depends on it.
When the configuration information is saved, it also includes a class method called
"Inline", inheritable by your module. This allows you in your module to simply say at the
top:
package Mymod;
use parent 'Mymod::Install::Files'; # to inherit 'Inline' method
And users of "Mymod" who want to write inline code (using Inline) will simply be able to
write:
use Inline with => 'Mymod';
And all the necessary header files, defines, and libraries will be added for them.
The "Mymod::Install::Files" will also implement a "deps" method, which will return a list
of any modules that "Mymod" depends on - you will not normally need to use this:
require Mymod::Install::Files;
@deps = Mymod::Install::Files->deps;
METHODS
$object = ExtUtils::Depends->new($name, @deps)
Create a new depends object named $name. Any modules listed in @deps (which may be
empty) are added as dependencies and their dependency information is loaded. An
exception is raised if any dependency information cannot be loaded.
$depends->add_deps (@deps)
Add modules listed in @deps as dependencies.
(hashes) = $depends->get_deps
Fetch information on the dependencies of $depends as a hash of hashes, which are
dependency information indexed by module name. See "load".
$depends->set_inc (@newinc)
Add strings to the includes or cflags variables.
$depends->set_libs (@newlibs)
Add strings to the libs (linker flags) variable.
$depends->add_pm (%pm_files)
Add files to the hash to be passed through ExtUtils::WriteMakefile's PM key.
$depends->add_xs (@xs_files)
Add xs files to be compiled.
$depends->add_c (@c_files)
Add C files to be compiled.
$depends->add_typemaps (@typemaps)
Add typemap files to be used and installed.
$depends->add_headers (list)
No-op, for backward compatibility.
$depends->install (@files)
Install @files to the data directory for $depends.
This actually works by adding them to the hash of pm files that gets passed through
WriteMakefile's PM key.
$depends->save_config ($filename)
Save the important information from $depends to $filename, and set it up to be
installed as name::Install::Files.
Note: the actual value of $filename is unimportant so long as it doesn't clash with
any other local files. It will be installed as name::Install::Files.
hash = $depends->get_makefile_vars
Return the information in $depends in a format digestible by WriteMakefile.
This sets at least the following keys:
INC
LIBS
TYPEMAPS
PM
And these if there is data to fill them:
clean
OBJECT
XS
hashref = ExtUtils::Depends::load (name)
Load and return dependency information for name. Croaks if no such information can be
found. The information is returned as an anonymous hash containing these keys:
instpath
The absolute path to the data install directory for this module.
typemaps
List of absolute pathnames for this module's typemap files.
inc CFLAGS string for this module.
libs
LIBS string for this module.
deps
List of modules on which this one depends. This key will not exist when loading
files created by old versions of ExtUtils::Depends.
If you want to make module name support this, you must provide a module
name::Install::Files, which on loading will implement the following class methods:
$hashref = name::Install::Files->Inline('C');
# hash to contain any necessary TYPEMAPS (array-ref), LIBS, INC
@deps = name::Install::Files->deps;
# any modules on which "name" depends
An easy way to achieve this is to use the method "$depends->save_config ($filename)",
but your package may have different facilities already.
$depends->load_deps
Load $depends dependencies, by calling "load" on each dependency module. This is
usually done for you, and should only be needed if you want to call "get_deps" after
calling "add_deps" manually.
SUPPORT
Bugs/Feature Requests
Version 0.2 discards some of the more esoteric features provided by the older versions.
As they were completely undocumented, and this module has yet to reach 1.0, this may not
exactly be a bug.
This module is tightly coupled to the ExtUtils::MakeMaker architecture.
You can submit new bugs/feature requests by using one of two bug trackers (below).
CPAN Request Tracker
You can submit bugs/feature requests via the web by going to
<https://rt.cpan.org/Public/Bug/Report.html?Queue=ExtUtils-Depends> (requires PAUSE ID
or Bitcard), or by sending an e-mail to "bug-ExtUtils-Depends at rt.cpan.org".
Gnome.org Bugzilla
Report bugs/feature requests to the 'gnome-perl' product (requires login)
<http://bugzilla.gnome.org/enter_bug.cgi?product=gnome-perl>
Patches that implement new features with test cases, and/or test cases that exercise
existing bugs are always welcome.
The Gtk-Perl mailing list is at "gtk-perl-list at gnome dot org".
Source Code
The source code to ExtUtils::Depends is available at the Gnome.org Git repo
(<https://git.gnome.org/browse/perl-ExtUtils-Depends/>). Create your own copy of the Git
repo with:
git clone git://git.gnome.org/perl-ExtUtils-Depends (Git protocol)
git clone https://git.gnome.org/browse/perl-ExtUtils-Depends/ (HTTPS)
SEE ALSO
ExtUtils::MakeMaker.
AUTHOR
Paolo Molaro <lupus at debian dot org> wrote the original version for Gtk-Perl. muppet
<scott at asofyet dot org> rewrote the innards for version 0.2, borrowing liberally from
Paolo's code.
MAINTAINER
The Gtk2 project, <http://gtk2-perl.sf.net>/"gtk-perl-list at gnome dot org".
LICENSE
This library is free software; you may redistribute it and/or modify it under the same
terms as Perl itself.