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perl5124delta (1)


perl5124delta - what is new for perl v5.12.4


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Perl Programmers Reference Guide                 PERL5124DELTA(1)

     perl5124delta - what is new for perl v5.12.4

     This document describes differences between the 5.12.3
     release and the 5.12.4 release.

     If you are upgrading from an earlier release such as 5.12.2,
     first read perl5123delta, which describes differences
     between 5.12.2 and 5.12.3. The major changes made in 5.12.0
     are described in perl5120delta.

Incompatible Changes
     There are no changes intentionally incompatible with 5.12.3.
     If any exist, they are bugs and reports are welcome.

Selected Bug Fixes
     When strict "refs" mode is off, "%{...}" in rvalue context
     returns "undef" if its argument is undefined.  An
     optimisation introduced in Perl 5.12.0 to make "keys %{...}"
     faster when used as a boolean did not take this into
     account, causing "keys %{+undef}" (and "keys %$foo" when
     $foo is undefined) to be an error, which it should be so in
     strict mode only [perl #81750].

     "lc", "uc", "lcfirst", and "ucfirst" no longer return
     untainted strings when the argument is tainted. This has
     been broken since perl 5.8.9 [perl #87336].

     Fixed a case where it was possible that a freed buffer may
     have been read from when parsing a here document.

Modules and Pragmata
     Module::CoreList has been upgraded from version 2.43 to

     The cpan/CGI/t/http.t test script has been fixed to work
     when the environment has HTTPS_* environment variables, such
     as HTTPS_PROXY.

     Updated the documentation for rand() in perlfunc to note
     that it is not cryptographically secure.

Platform Specific Notes
         Support Ubuntu 11.04's new multi-arch library layout.

     Perl 5.12.4 represents approximately 5 months of development
     since Perl 5.12.3 and contains approximately 200 lines of

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Perl Programmers Reference Guide                 PERL5124DELTA(1)

     changes across 11 files from 8 authors.

     Perl continues to flourish into its third decade thanks to a
     vibrant community of users and developers.  The following
     people are known to have contributed the improvements that
     became Perl 5.12.4:

     Andy Dougherty, David Golden, David Leadbeater, Father
     Chrysostomos, Florian Ragwitz, Jesse Vincent, Leon Brocard,
     Zsban Ambrus.

Reporting Bugs
     If you find what you think is a bug, you might check the
     articles recently posted to the comp.lang.perl.misc
     newsgroup and the perl bug database at .  There may also be information
     at , the Perl Home Page.

     If you believe you have an unreported bug, please run the
     perlbug program included with your release.  Be sure to trim
     your bug down to a tiny but sufficient test case.  Your bug
     report, along with the output of "perl -V", will be sent off
     to to be analysed by the Perl porting team.

     If the bug you are reporting has security implications,
     which make it inappropriate to send to a publicly archived
     mailing list, then please send it to This points to a closed
     subscription unarchived mailing list, which includes all the
     core committers, who be able to help assess the impact of
     issues, figure out a resolution, and help co-ordinate the
     release of patches to mitigate or fix the problem across all
     platforms on which Perl is supported. Please only use this
     address for security issues in the Perl core, not for
     modules independently distributed on CPAN.

     See attributes(5) for descriptions of the following

     |Availability   | runtime/perl-512 |
     |Stability      | Uncommitted      |
     The Changes file for an explanation of how to view
     exhaustive details on what changed.

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Perl Programmers Reference Guide                 PERL5124DELTA(1)

     The INSTALL file for how to build Perl.

     The README file for general stuff.

     The Artistic and Copying files for copyright information.

     This software was built from source available at  The original
     community source was downloaded from

     Further information about this software can be found on the
     open source community website at

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