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Source   Latest Release: perl-5.19.11


perl5196delta - what is new for perl v5.19.6


This document describes differences between the 5.19.5 release and the 5.19.6 release.

If you are upgrading from an earlier release such as 5.19.4, first read perl5195delta, which describes differences between 5.19.4 and 5.19.5.

Core Enhancements ^

$a and $b warnings exemption

The special variables $a and $b, used in sort, are now exempt from "used once" warnings, even where sort is not used. This makes it easier for CPAN modules to provide functions using $a and $b for similar purposes. [perl #120462]

Deprecations ^

Module removals

The following modules will be removed from the core distribution in a future release, and will at that time need to be installed from CPAN. Distributions on CPAN which require these modules will need to list them as prerequisites.

The core versions of these modules will now issue "deprecated"-category warnings to alert you to this fact. To silence these deprecation warnings, install the modules in question from CPAN.

Note that these are (with rare exceptions) fine modules that you are encouraged to continue to use. Their disinclusion from core primarily hinges on their necessity to bootstrapping a fully functional, CPAN-capable Perl installation, not usually on concerns over their design.


Performance Enhancements ^

Modules and Pragmata ^

Updated Modules and Pragmata

Documentation ^

Changes to Existing Documentation

Diagnostics ^

Changes to Existing Diagnostics

Testing ^

Platform Support ^

New Platforms


Synology ships its NAS boxes with a lean Linux distribution (DSM) on relative cheap CPU's (like the Marvell Kirkwood mv6282 - ARMv5tel or Freescale QorIQ P1022 ppc - e500v2) not meant for workstations or development. These boxes should build now. The basic problems are the non-standard location for tools.

Platform-Specific Notes


Support for building with Visual C++ 2013 has been added. There are currently two possible test failures (see "Testing Perl on Windows" in perlwin32) which will hopefully be resolved soon.

Experimental support for building with Intel C++ Compiler has been added. Only the nmake makefile (win32/Makefile) can be used. A "nmake test" will not pass at this time due to "cpan/CGI/t/url.t".


Perl can now be built in one shot with no user intervention on WinCE by running nmake -f Makefile.ce all.

Support for building with EVC (Embedded Visual C++) 4 has been restored. Perl can also be built using Smart Devices for Visual C++ 2005 or 2008.

Internal Changes ^

Selected Bug Fixes ^

Known Problems ^

Acknowledgements ^

Perl 5.19.6 represents approximately 4 weeks of development since Perl 5.19.5 and contains approximately 88,000 lines of changes across 630 files from 24 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 5.19.6:

Anno Siegel, Chris 'BinGOs' Williams, Craig A. Berry, Daniel Dragan, David Mitchell, Father Chrysostomos, François Perrad, H.Merijn Brand, James E Keenan, Jerry D. Hedden, Karen Etheridge, Karl Williamson, Kevin Falcone, Lukas Mai, Marc Simpson, Matthew Horsfall, Peter Martini, Petr Písař, Reini Urban, Steve Hay, Tom Hukins, Tony Cook, Victor Efimov, 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 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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