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perl5254delta - what is new for perl v5.25.4


This document describes differences between the 5.25.3 release and the 5.25.4 release.

If you are upgrading from an earlier release such as 5.25.2, first read perl5253delta, which describes differences between 5.25.2 and 5.25.3.

Performance Enhancements ^

Documentation ^

Changes to Existing Documentation


Modules and Pragmata ^

Updated Modules and Pragmata

Configuration and Compilation ^

Platform Support ^

Platform-Specific Notes


The hints for Hurd have been improved enabling malloc wrap and reporting the GNU libc used (previously it was an empty string when reported).

Internal Changes ^

Selected Bug Fixes ^

Acknowledgements ^

Perl 5.25.4 represents approximately 4 weeks of development since Perl 5.25.3 and contains approximately 18,000 lines of changes across 820 files from 23 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 9,200 lines of changes to 660 .pm, .t, .c and .h files.

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 5.25.4:

Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Collins, Daniel Dragan, David Mitchell, Father Chrysostomos, H.Merijn Brand, James E Keenan, Jarkko Hietaniemi, Karen Etheridge, Karl Williamson, Lukas Mai, Neil Bowers, Nicolas R., Pino Toscano, Rafael Garcia-Suarez, Richard Levitte, Shlomi Fish, Smylers, Steve Hay, Tony Cook, Yves Orton.

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 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 see "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to report the issue.


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.

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