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PERL5124DELTA(1)                  Perl Programmers Reference Guide                  PERL5124DELTA(1)



NAME
       perl5124delta - what is new for perl v5.12.4

DESCRIPTION
       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 2.50.

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

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

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

Acknowledgements
       Perl 5.12.4 represents approximately 5 months of development since Perl 5.12.3 and contains
       approximately 200 lines of 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, Zsbán 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 http://rt.perl.org/perlbug/ .
       There may also be information at http://www.perl.org/ , 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 perlbug AT perl.org 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 perl5-security-report AT perl.org.
       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 ALSO
       The Changes file for an explanation of how to view exhaustive details on what changed.

       The INSTALL file for how to build Perl.

       The README file for general stuff.

       The Artistic and Copying files for copyright information.



perl v5.34.0                                 2025-07-25                             PERL5124DELTA(1)