package Task::Weaken; use 5.005; use strict; use vars qw{$VERSION}; BEGIN { $VERSION = '1.03'; } 1; __END__ =pod =head1 NAME Task::Weaken - Ensure that a platform has weaken support =head1 DESCRIPTION One recurring problem in modules that use L<Scalar::Util>'s C<weaken> function is that it is not present in the pure-perl variant. While this isn't necesarily always a problem in a straight CPAN-based Perl environment, some operating system distributions only include the pure-Perl versions, don't include the XS version, and so weaken is then "missing" from the platform, B<despite> passing a dependency on L<Scalar::Util> successfully. Most notably this is RedHat Linux at time of writing, but other come and go and do the same thing, hence "recurring problem". The normal solution is to manually write tests in each distribution to ensure that C<weaken> is available. This restores the functionality testing to a dependency you do once in your F<Makefile.PL>, rather than something you have to write extra tests for each time you write a module. It should also help make the package auto-generators for the various operating systems play more nicely, because it introduces a dependency that they B<have> to have a proper weaken in order to work. =head2 How this Task works Part of the problem seems to stem from the fact that some distributions continue to include modules even if they fail some of their tests. To get around that for this module, it will do a few dirty tricks. If L<Scalar::Util> is not available at all, it will issue a normal dependency on the module. However, if L<Scalar::Util> is relatively new ( it is >= 1.19 ) and the module does B<not> have weaken, the install will bail out altogether with a long error encouraging the user to seek support from their vendor (this problem happens most often in vendor-packaged Perl versions). This distribution also contains tests to ensure that weaken is available using more normal methods. So if your module uses C<weaken>, you can just add the following to your L<Module::Install>-based F<Makefile.PL> (or equivalent). requires 'Task::Weaken' => 0; =head1 AUTHOR Adam Kennedy E<lt>adamk@cpan.orgE<gt>, L<http://ali.as/> =head1 SEE ALSO L<Task>, L<Scalar::Util>, L<http://ali.as/> =head1 COPYRIGHT Copyright 2006 - 2009 Adam Kennedy. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of the license can be found in the LICENSE file included with this module. =cut