phpman > perldoc > Task::Weaken(3pm)

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

VERSION
    version 1.06

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 necessarily 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;

SUPPORT
    Bugs should be always be reported via the CPAN bug tracker at

    <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=Task-Weaken>

    For other issues,contact the author.

AUTHOR
    Adam Kennedy <adamk AT cpan.org>

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

COPYRIGHT
    Copyright 2006 - 2011 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.