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Steve Hay > perl-5.19.5 > perl5191delta


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Source   Latest Release: perl-5.19.11


perl5191delta - what is new for perl v5.19.1


This document describes differences between the 5.19.0 release and the 5.19.1 release.

Core Enhancements ^

No new features have been added.

Security ^

There are no new security issues.

Incompatible Changes ^

Most regex engine global state eliminated

As part of this series of fixes it was necessary to change the API of Perl_re_intuit_start(). See "Internal Changes" for more.

Locale decimal point character no longer leaks outside of use locale scope

This is actually a bug fix, but some code has come to rely on the bug being present, so this change is listed here. The current locale that the program is running under is not supposed to be visible to Perl code except within the scope of a use locale. However, until now under certain circumstances, the character used for a decimal point (often a comma) leaked outside the scope. If your code is affected by this change, simply add a use locale.

Performance Enhancements ^

Modules and Pragmata ^

Updated Modules and Pragmata

Documentation ^

Changes to Existing Documentation





Diagnostics ^

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.

New Warnings

Utility Changes ^ enhancements

The git bisection tool Porting/ has had many enhancements.

It is provided as part of the source distribution but not installed because it is not self-contained as it relies on being run from within a git checkout. Note also that it makes no attempt to fix tests, correct runtime bugs or make something useful to install - its purpose is to make minimal changes to get any historical revision of interest to build and run as close as possible to "as-was", and thereby make git bisect easy to use.

Platform Support ^

Discontinued Platforms


DG/UX was a Unix sold by Data General. The last release was in April 2001. It only runs on Data General's own hardware.

Platform-Specific Notes

Mixed-endian platforms

The code supporting pack and unpack operations on mixed endian platforms has been removed. We believe that Perl has long been unable to build on mixed endian architectures (such as PDP-11s), so we don't think that this change will affect any platforms which are able to build v5.18.0.


The BUILD_STATIC and ALL_STATIC makefile options for linking some or (nearly) all extensions statically (into perl519.dll, and into a separate perl-static.exe too) were broken for MinGW builds. This has now been fixed.

The ALL_STATIC option has also been improved to include the Encode and Win32 extensions (for both VC++ and MinGW builds).

Internal Changes ^

Selected Bug Fixes ^

Acknowledgements ^

Perl 5.19.1 represents approximately 4 weeks of development since Perl 5.19.0 and contains approximately 26,000 lines of changes across 680 files from 37 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 5.19.1:

Alexandr Ciornii, Brian Fraser, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, Daniel Dragan, David Golden, David Mitchell, David Steinbrunner, Dominic Hargreaves, Eric Brine, Father Chrysostomos, H.Merijn Brand, Heiko Eissfeldt, James E Keenan, Jerry D. Hedden, Kang-min Liu, Karl Williamson, Leon Timmermans, Lukas Mai, Marcel Grünauer, Mark Jason Dominus, Max Maischein, Mike Doherty, Nicholas Clark, Paul Green, Peter Martini, Petr Písař, Ricardo Signes, Shirakata Kentaro, Shlomi Fish, Steffen Müller, Steve Hay, Sullivan Beck, Tony Cook, Yves Orton, Zsbán Ambrus.

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 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 will 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.


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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