perl5334delta - what is new for perl v5.33.4


This document describes differences between the 5.33.3 release and the 5.33.4 release.

If you are upgrading from an earlier release such as 5.33.2, first read perl5333delta, which describes differences between 5.33.2 and 5.33.3.

Modules and Pragmata

Updated Modules and Pragmata

  • B has been upgraded from version 1.81 to 1.82.

  • ExtUtils::CBuilder has been upgraded from version 0.280234 to 0.280235.

  • ExtUtils::MakeMaker has been upgraded from version 7.48 to 7.56.

  • File::Fetch has been upgraded from version 0.56 to 1.00.

  • File::Path has been upgraded from version 2.17 to 2.18.

  • File::Spec has been upgraded from version 3.78 to 3.79.

  • IPC::SysV has been upgraded from version 2.08 to 2.09.

  • Module::CoreList has been upgraded from version 5.20201020 to 5.20201120.

  • Net::Ping has been upgraded from version 2.73_01 to 2.74.

  • perlfaq has been upgraded from version 5.20200523 to 5.20201107.

  • Pod::Html has been upgraded from version 1.25 to 1.26.

  • Pod::Simple has been upgraded from version 3.41 to 3.42.

  • Test::Simple has been upgraded from version 1.302182 to 1.302183.

  • XS::APItest has been upgraded from version 1.12 to 1.13.


Changes to Existing Documentation

We have attempted to update the documentation to reflect the changes listed in this document. If you find any we have missed, open an issue at


  • The Perl FAQ was updated to CPAN version 5.20201107 with minor improvements.


  • Efforts continue in improving the presentation of this document, and to document more API elements.


The following additions or changes have been made to diagnostic output, including warnings and fatal error messages. For the complete list of diagnostic messages, see perldiag.

Changes to Existing Diagnostics

Platform Support

Platform-Specific Notes


Tests were updated to workaround DragonFlyBSD bugs in tc*() functions and ctime updates.

Selected Bug Fixes


Perl 5.33.4 represents approximately 4 weeks of development since Perl 5.33.3 and contains approximately 6,900 lines of changes across 340 files from 16 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 4,200 lines of changes to 260 .pm, .t, .c and .h files.

Perl continues to flourish into its fourth decade thanks to a vibrant community of users and developers. The following people are known to have contributed the improvements that became Perl 5.33.4:

Ben Cornett, Chris 'BinGOs' Williams, Dan Book, David Mitchell, Giovanni Tataranni, James E Keenan, Karen Etheridge, Karl Williamson, Marcus Holland-Moritz, Nicolas R., Richard Leach, Scott Baker, Steve Hay, TAKAI Kousuke, Tom Hukins, Tony Cook.

The list above is almost certainly incomplete as it is automatically generated from version control history. In particular, it does not include the names of the (very much appreciated) contributors who reported issues to the Perl bug tracker.

Many of the changes included in this version originated in the CPAN modules included in Perl's core. We're grateful to the entire CPAN community for helping Perl to flourish.

For a more complete list of all of Perl's historical contributors, please see the AUTHORS file in the Perl source distribution.

Reporting Bugs

If you find what you think is a bug, you might check the perl bug database at There may also be information at, the Perl Home Page.

If you believe you have an unreported bug, please open an issue at Be sure to trim your bug down to a tiny but sufficient test case.

If the bug you are reporting has security implications which make it inappropriate to send to a public issue tracker, then see "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to report the issue.

Give Thanks

If you wish to thank the Perl 5 Porters for the work we had done in Perl 5, you can do so by running the perlthanks program:


This will send an email to the Perl 5 Porters list with your show of thanks.


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.