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perl-5.45.1
⭐ Starred 2013 / perldelta

NAME

perldelta - what is new for perl v5.45.0

DESCRIPTION

This document describes differences between the 5.44.0 release and the 5.45.0 release.

If you are upgrading from an earlier release such as 5.43.0, first read perl5440delta, which describes differences between 5.43.0 and 5.44.0.

Incompatible Changes

Mutex locks for getprotoent and getservent are removed

The macros GETPROTOENT_LOCK and GETSERVENT_LOCK macros are removed, along with their unlocking counterparts. These macros, though never documented, were intended to create thread safety when using their corresponding functions in a threaded-perl. But they didn't actually furnish that, so using them would give a false sense of security. Another thread simultaneously accessing the database could move the pointers, so these would act unpredictably.

Performance Enhancements

  • Some pattern matches against long strings are now faster: in particular where the pattern: is anchored; contains a short fixed substring; and contains a floating substring which is as long or longer than than the fixed substring; but where the fixed substring isn't present in the target string. For example this match will be rejected much faster now:

    "-" x 10_000_000 =~ /^abc.*def/

Modules and Pragmata

Updated Modules and Pragmata

  • autouse has been upgraded from version 1.11 to 1.12.

  • ExtUtils::ParseXS has been upgraded from version 3.63 to 3.64.

  • ExtUtils::Typemaps has been upgraded from version 3.63 to 3.64.

  • Fcntl has been upgraded from version 1.20 to 1.21.

  • feature has been upgraded from version 2.02 to 2.03.

  • JSON::PP has been upgraded from version 4.16 to 4.18.

  • Module::CoreList has been upgraded from version 5.20260715 to 5.20260720.

  • podlators has been upgraded from version v6.0.2 to v6.1.0.

  • SelfLoader has been upgraded from version 1.29 to 1.30.

  • Test::Simple has been upgraded from version 1.302219 to 1.302222.

  • threads has been upgraded from version 2.45 to 2.46.

  • threads::shared has been upgraded from version 1.73 to 1.74.

  • XS::APItest has been upgraded from version 1.50 to 1.51.

Platform Support

Platform-Specific Notes

VMS

Socket support is no longer a configure-time option on OpenVMS; sockets will always be available in Perl and are based on the universal socket support in the CRTL.

Internal Changes

Selected Bug Fixes

  • Allow field lookups within methods in nested scopes to succeed, previously they could complain that Field $fieldname is not accessible outside a method....

    This was most confusingly broken with a use:

    class A {
  field $fieldname;
  use overload '""' => method (@) { $fieldname };
}

    since the syntax hides the BEGIN sub.

    [GH #24464]

  • Many potential threads-related race conditions have been fixed in the perl core and the two threads and threads::shared modules.

  • Line numbers reported by caller() and diagnostic messages are now more accurate when the relevant COP has been optimized out (occurring often when the line is the first in an elsif block, or when the line is inside a loop condition (such as within a while ()). [GH #24387] [GH #24389]

    Note that (i) these changes could break any tests that hardcode the less-accurate line numbers (ii) further improvements to line number accuracy will hopefully follow within this development cycle.

Acknowledgements

Perl 5.45.1 represents approximately 1 week of development since Perl 5.44.0 and contains approximately 36,000 lines of changes across 470 files from 19 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 12,000 lines of changes to 310 .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 5.45.1:

Andrew Fresh, Chad Granum, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, David Mitchell, Georgij Tsarin, Graham Knop, James E Keenan, Karl Williamson, Leon Timmermans, Lukas Mai, Paul Evans, Philippe Bruhat (BooK), Richard Leach, Russ Allbery, 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 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.