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NAME

perldelta - what is new for perl v5.39.4

DESCRIPTION

This document describes differences between the 5.39.3 release and the 5.39.4 release.

If you are upgrading from an earlier release such as 5.39.2, first read perl5393delta, which describes differences between 5.39.2 and 5.39.3.

Modules and Pragmata

New Modules and Pragmata

  • Test2::Suite 0.000156 has been added to the Perl core.

    This distribution contains a comprehensive set of test tools for writing unit tests. It is the successor to Test::More and similar modules. Its inclusion in the Perl core means that CPAN module tests can be written using this suite of tools without extra dependencies.

  • Term::Table 0.017 has been added to the Perl core.

    This module is a dependency of Test2::Suite.

Updated Modules and Pragmata

  • feature has been upgraded from version 1.84 to 1.85.

    It now documents the :all feature bundle, and suggests a reason why you may not wish to use it.

  • builtin now accepts a version bundle as an input argument, requesting it to import all of the functions that are considered a stable part of the module at the given Perl version. For example:

    use builtin ':5.40';

  • POSIX has been upgraded from version 2.15 to 2.16.

    The mktime function now works correctly on 32-bit platforms even if the platform's time_t type is larger than 32 bits. [GH #21551]

    The T_SIGNO and T_FD typemap entries have been fixed so they work with any variable name, rather than just the hardcoded sig and fd.

    The mappings for Mode_t, pid_t, Uid_t, Gid_t and Time_t have been updated to be integer types; previously they were NV floating-point.

  • perl5db.pl has been upgraded from version 1.77 to 1.78.

    Made parsing of the l command arguments saner. [GH #21350]

  • Module::CoreList has been upgraded from version 5.20230920 to 5.20231025.

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.

Additionally, the following selected changes have been made:

perlre

  • Removed statement suggesting /p is a no-op.

perlapi

  • Several internal functions now have documentation - the various newSUB functions, newANONLIST(), newANONHASH(), newSVREF() and similar.

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 Diagnostics

New Errors

  • Builtin version bundle "%s" is not supported by Perl

    (F) You attempted to use builtin :ver for a version number that is either older than 5.39 (when the ability was added), or newer than the current perl version.

  • Invalid version bundle "%s"

    (F) A version number that is used to specify an import bundle during a use builtin ... statement must be formatted as :MAJOR.MINOR with an optional third component, which is ignored. Each component must be a number of 1 to 3 digits. No other characters are permitted. The value that was specified does not conform to these rules.

Testing

Tests were added and changed to reflect the other additions and changes in this release.

Platform Support

Platform-Specific Notes

VMS

Fixed the configure "installation prefix" prompt to accept a string rather than yes/no.

Fixed compilation by defining proper value for perl_lc_all_category_positions_init.

Increased buffer size when reading config_H.SH to fix compilation under clang.

Internal Changes

  • PERL_VERSION_LE has been fixed to properly check for "less than or equal" rather than "less than".

Selected Bug Fixes

  • Lexical names from the enclosing scope in a lexical sub or closure weren't visible to code executed by calling eval EXPR; from the DB package. This was introduced in 5.18 in an attempt to prevent subs from retaining a reference to their outer scope, but this broke the special behaviour of eval EXPR; in package DB.

    This incidentally fixed a TODO test for B::Deparse. [GH #19370]

  • Optionally support an argument stack over 2**32 entries on 64-bit platforms. This requires 32GB of memory just for the argument stack pointers itself, so you will require a significantly more memory to take advantage of this.

    To enable this add -Accflags=-DPERL_STACK_OFFSET_SSIZET or equivalent to the Configure command-line.

    [GH #20917] [GH #21523]

  • Fixed various problems with join() where modifications to the separator could be handled inconsistently, or could access released memory. Changes to the separator from magic or overloading for values in the LIST no longer have an effect on the resulting joined string. [GH #21458]

  • Don't clear the integer flag IOK from lines in the @{"_<$sourcefile"} array when a dbstate op is removed for that line. This was broken when fixing [GH #19198]. [GH #21564]

  • Many bug fixes have been made for using locales under threads and in embedded perls. And workarounds for libc bugs have been added. As a result thread-safe locale handling is now the default under OpenBSD, and MingW when compiled with UCRT.

    However, testing has shown that Darwin's implementation of thread-safe locale handling has bugs. So now Perl doesn't attempt to use the thread-safe operations when compiled on Darwin.

    As before, you can check to see if your program is running with thread-safe locales by checking if the value of ${^SAFE_LOCALES} is 1.

  • Various bugs have been fixed when perl is configured with -Accflags=-DNO_LOCALE_NUMERIC or any other locale category (or categories).

  • Not all locale categories need be set to the same locale. Perl now works around bugs in the libc implementations of locale handling on some platforms that previously could result in mojibake.

  • LC_ALL is represented in one of two ways when not all locale categories are set to the same locale. On some platforms, such as Linux and Windows, the representation is of the form of a series of 'category=locale-name' pairs. On other platforms, such as *BSD, the representation is positional like name1 / name2 / ... . name1 is always for a particular category as defined by the platform, as are the other names. The sequence that separates the names (the / above) also varies by platform. Previously, perl had problems with platforms that used the positional notation. This is now fixed.

  • A bug has been fixed in the regexp engine with an optimisation that applies to the + quantifier where it was followed by a (*SKIP) pattern.

    [GH #21534]

Acknowledgements

XXX Generate this with:

perl Porting/acknowledgements.pl v5.39.3..HEAD

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 http://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.