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PERL5141DELTA(1)                  Perl Programmers Reference Guide                  PERL5141DELTA(1)



NAME
       perl5141delta - what is new for perl v5.14.1

DESCRIPTION
       This document describes differences between the 5.14.0 release and the 5.14.1 release.

       If you are upgrading from an earlier release such as 5.12.0, first read perl5140delta, which
       describes differences between 5.12.0 and 5.14.0.

Core Enhancements
       No changes since 5.14.0.

Security
       No changes since 5.14.0.

Incompatible Changes
       There are no changes intentionally incompatible with 5.14.0. If any exist, they are bugs and
       reports are welcome.

Deprecations
       There have been no deprecations since 5.14.0.

Modules and Pragmata
   New Modules and Pragmata
       None

   Updated Modules and Pragmata
       •   B::Deparse has been upgraded from version 1.03 to 1.04, to address two regressions in
           Perl 5.14.0:

           Deparsing of the "glob" operator and its diamond ("<>") form now works again. [perl
           #90898]

           The presence of subroutines named "::::" or "::::::" no longer causes B::Deparse to hang.

       •   Pod::Perldoc has been upgraded from version 3.15_03 to 3.15_04.

           It corrects the search paths on VMS. [perl #90640]

   Removed Modules and Pragmata
       None

Documentation
   New Documentation
       None

   Changes to Existing Documentation
       perlfunc

       •   "given", "when" and "default" are now listed in perlfunc.

       •   Documentation for "use" now includes a pointer to if.pm.

       perllol

       •   perllol has been expanded with examples using the new "push $scalar" syntax introduced in
           Perl 5.14.0.

       perlop

       •   The explanation of bitwise operators has been expanded to explain how they work on
           Unicode strings.

       •   The section on the triple-dot or yada-yada operator has been moved up, as it used to
           separate two closely related sections about the comma operator.

       •   More examples for "m//g" have been added.

       •   The "<<\FOO" here-doc syntax has been documented.

       perlrun

       •   perlrun has undergone a significant clean-up.  Most notably, the -0x... form of the -0
           flag has been clarified, and the final section on environment variables has been
           corrected and expanded.

       POSIX

       •   The invocation documentation for "WIFEXITED", "WEXITSTATUS", "WIFSIGNALED", "WTERMSIG",
           "WIFSTOPPED", and "WSTOPSIG" was corrected.

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
       None

   Changes to Existing Diagnostics
       None

Utility Changes
       None

Configuration and Compilation
       •   regexp.h has been modified for compatibility with GCC's "-Werror" option, as used by some
           projects that include perl's header files.

Testing
       •   Some test failures in dist/Locale-Maketext/t/09_compile.t that could occur depending on
           the environment have been fixed. [perl #89896]

       •   A watchdog timer for t/re/re.t was lengthened to accommodate SH-4 systems which were
           unable to complete the tests before the previous timer ran out.

Platform Support
   New Platforms
       None

   Discontinued Platforms
       None

   Platform-Specific Notes
       Solaris

       •   Documentation listing the Solaris packages required to build Perl on Solaris 9 and
           Solaris 10 has been corrected.

       Mac OS X

       •   The lib/locale.t test script has been updated to work on the upcoming Lion release.

       •   Mac OS X specific compilation instructions have been clarified.

       Ubuntu Linux

       •   The ODBM_File installation process has been updated with the new library paths on Ubuntu
           natty.

Internal Changes
       •   The compiled representation of formats is now stored via the mg_ptr of their
           PERL_MAGIC_fm. Previously it was stored in the string buffer, beyond SvLEN(), the regular
           end of the string. SvCOMPILED() and SvCOMPILED_{on,off}() now exist solely for
           compatibility for XS code.  The first is always 0, the other two now no-ops.

Bug Fixes
       •   A bug has been fixed that would cause a "Use of freed value in iteration" error if the
           next two hash elements that would be iterated over are deleted. [perl #85026]

       •   Passing the same constant subroutine to both "index" and "formline" no longer causes one
           or the other to fail. [perl #89218]

       •   5.14.0 introduced some memory leaks in regular expression character classes such as
           "[\w\s]", which have now been fixed.

       •   An edge case in regular expression matching could potentially loop.  This happened only
           under "/i" in bracketed character classes that have characters with multi-character
           folds, and the target string to match against includes the first portion of the fold,
           followed by another character that has a multi-character fold that begins with the
           remaining portion of the fold, plus some more.

            "s\N{U+DF}" =~ /[\x{DF}foo]/i

           is one such case.  "\xDF" folds to "ss".

       •   Several Unicode case-folding bugs have been fixed.

       •   The new (in 5.14.0) regular expression modifier "/a" when repeated like "/aa" forbids the
           characters outside the ASCII range that match characters inside that range from matching
           under "/i".  This did not work under some circumstances, all involving alternation, such
           as:

            "\N{KELVIN SIGN}" =~ /k|foo/iaa;

           succeeded inappropriately.  This is now fixed.

       •   Fixed a case where it was possible that a freed buffer may have been read from when
           parsing a here document.

Acknowledgements
       Perl 5.14.1 represents approximately four weeks of development since Perl 5.14.0 and contains
       approximately 3500 lines of changes across 38 files from 17 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 5.14.1:

       Bo Lindbergh, Claudio Ramirez, Craig A. Berry, David Leadbeater, Father Chrysostomos, Jesse
       Vincent, Jim Cromie, Justin Case, Karl Williamson, Leo Lapworth, Nicholas Clark, Nobuhiro
       Iwamatsu, smash, Tom Christiansen, Ton Hospel, Vladimir Timofeev, and Zsbán Ambrus.

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 http://rt.perl.org/perlbug/ .
       There may also be information at http://www.perl.org/ , 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 perlbug AT perl.org 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 perl5-security-report AT perl.org.
       This points to a closed subscription unarchived mailing list, which includes all the core
       committers, who 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.

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 v5.34.0                                 2025-07-25                             PERL5141DELTA(1)