PERL5401DELTA(1) Perl Programmers Reference Guide PERL5401DELTA(1)
NAME
perldelta - what is new for perl v5.40.1
DESCRIPTION
This document describes differences between the 5.40.0 release and the
5.40.1 release.
If you are upgrading from an earlier release such as 5.39.0, first read
perl5400delta, which describes differences between 5.39.0 and 5.40.0.
Incompatible Changes
There are no changes intentionally incompatible with 5.40.0. If any
exist, they are bugs, and we request that you submit a report. See
"Reporting Bugs" below.
Modules and Pragmata
Updated Modules and Pragmata
• File::Spec has been upgraded from version 3.90 to 3.91.
• Module::CoreList has been upgraded from version 5.20240609 to
5.20250118_40.
• warnings has been upgraded from version 1.69 to 1.70.
Documentation
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 <https://github.com/Perl/perl5/issues>.
Configuration and Compilation
• Fixed compilation on platforms (e.g. "Gentoo Prefix") with only a C
locale. [GH #22569 <https://github.com/Perl/perl5/issues/22569>]
Bug first reported downstream at bugs.gentoo.org/939014
<https://bugs.gentoo.org/939014>.
• Fixed compilation error on some systems due to a typo in a printf()
format. [GH #22793 <https://github.com/Perl/perl5/issues/22793>]
Testing
Tests were added and changed to reflect the other additions and changes
in this release.
Selected Bug Fixes
• Starting in Perl 5.39.8, ""strftime"" in POSIX would crash or
produce odd errors (such as "Out of memory in
perl:util:safesysmalloc") when given a format string that wasn't
actually a string, but a number, "undef", or an object (even one
with overloaded string conversion).
Now "strftime" stringifies its first argument, as before. [GH
#22498 <https://github.com/Perl/perl5/issues/22498>]
• Builds with "-msse" and quadmath on 32-bit x86 systems would crash
with a misaligned access early in the build. [GH #22577
<https://github.com/Perl/perl5/issues/22577>]
• Using "goto" to tail call, or using the call_sv() and related APIs
to call, any of trim(), refaddr(), reftype(), ceil(), floor() or
stringify() in the "builtin::" package would crash or assert due to
a "TARG" handling bug. [GH #22542
<https://github.com/Perl/perl5/issues/22542>]
• Fixed an issue where utf8n_to_uvchr() failed to correctly identify
certain invalid UTF-8 sequences as invalid. Specifically, sequences
that start with continuation bytes or unassigned bytes could cause
unexpected behaviour or a panic. This fix ensures that such invalid
sequences are now properly detected and handled. This correction
also resolves related issues in modules that handle UTF-8
processing, such as Encode.
• Fixed a double free error or possible memory leak when failing to
compile certain regexps. [GH #21661
<https://github.com/Perl/perl5/issues/21661>]
Acknowledgements
Perl 5.40.1 represents approximately 7 months of development since Perl
5.40.0 and contains approximately 5,600 lines of changes across 54 files
from 15 authors.
Excluding auto-generated files, documentation and release tools, there
were approximately 1,800 lines of changes to 19 .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 5.40.1:
Andrei Horodniceanu, Chris 'BinGOs' Williams, E. Choroba, Graham Knop,
James E Keenan, Karen Etheridge, Karl Williamson, Lukas Mai, Masahiro
Honma, Max Maischein, Philippe Bruhat (BooK), Richard Leach, Steve Hay,
Thibault Duponchelle, 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 <https://github.com/Perl/perl5/issues>. There may also be
information at <https://www.perl.org/>, the Perl Home Page.
If you believe you have an unreported bug, please open an issue at
<https://github.com/Perl/perl5/issues>. 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:
perlthanks
This will send an email to the Perl 5 Porters list with your show of
thanks.
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 v5.40.1 2026-08-30 PERL5401DELTA(1)
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