NAME
   Task::Weaken - Ensure that a platform has weaken support

DESCRIPTION
   One recurring problem in modules that use Scalar::Util's "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, despite passing a dependency on
   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 "weaken" is available.

   This restores the functionality testing to a dependency you do once in
   your 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 have to have a proper weaken in order to work.

 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 Scalar::Util is not available at all, it will issue a normal
   dependency on the module. However, if Scalar::Util is relatively new (
   it is >= 1.19 ) and the module does 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 "weaken", you can just add the following to your
   Module::Install-based Makefile.PL (or equivalent).

     requires 'Task::Weaken' => 0;

AUTHOR
   Adam Kennedy <[email protected]>, <http://ali.as/>

SEE ALSO
   Task, Scalar::Util, <http://ali.as/>

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.

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