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perl5340delta
(source,CPAN)

CONTENTS

#NAME

perl5340delta - what is new for perl v5.34.0

#DESCRIPTION

This document describes differences between the 5.32.0 release and the 5.34.0 release.

If you are upgrading from an earlier release such as 5.30.0, first readperl5320delta, which describes differences between 5.30.0 and 5.32.0.

#Core Enhancements

#Experimental Try/Catch Syntax

An initial experimental attempt at providingtry/catch notation has been added.

use feature 'try';try {    a_function();}catch ($e) {    warn "An error occurred: $e";}

For more information, see"Try Catch Exception Handling" in perlsyn.

#qr/{,n}/ is now accepted

An empty lower bound is now accepted for regular expression quantifiers, likem/x{,3}/ meaningm/x{0,3}/

#Blanks freely allowed within but adjacent to curly braces

(in double-quotish contexts and regular expression patterns)

This means you can write things like\x{ FFFC } if you like. This applies to all such constructs, namely\b{},\g{},\k{},\N{},\o{}, and\x{}; as well as the regular expression quantifier{m,n}.\p{} and\P{} retain their already-existing, even looser, rules mandated by the Unicode standard (see"Properties accessible through \p{} and \P{}" in perluniprops).

This ability is in effect regardless of the presence of the/x regular expression pattern modifier.

Additionally, the comma in a regular expression braced quantifier may have blanks (tabs or spaces) before and/or after the comma, likeqr/a{ 5, 7 }/.

#New octal syntax0oddddd

It is now possible to specify octal literals with0o prefixes, as in0o123_456, parallel to the existing construct to specify hexadecimal literal0xddddd and binary literal0bddddd. Also, the builtinoct() function now accepts this new syntax.

See"Scalar value constructors" in perldata and"oct EXPR" in perlfunc.

#Performance Enhancements

#Modules and Pragmata

#New Modules and Pragmata

#Updated Modules and Pragmata

#Documentation

#New Documentation

#perldocstyle

This document is a guide for the authorship and maintenance of the documentation that ships with Perl.

#perlgov

This document describes the goals, scope, system, and rules for Perl's new governance model.

Other pod files, most notablyperlpolicy, were amended to reflect its adoption.

#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 athttps://github.com/Perl/perl5/issues.

Additionally, the following selected changes have been made:

#perlapi

#perlcommunity

#perldebguts

#perldiag

#perlfaq

#perlfunc

#perlgit

#perlguts

#perlop

#perlpacktut

#perlsyn

#perlunifaq

#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, seeperldiag.

#New Diagnostics

#New Errors

#New Warnings

#Changes to Existing Diagnostics

#Utility Changes

#perl5db.pl (the debugger)

#Configuration and Compilation

#Testing

Tests were added and changed to reflect the other additions and changes in this release. Furthermore, these significant changes were made:

#Platform Support

#New Platforms

#9front

Allow building Perl on i386 9front systems (a fork of plan9).

#Updated Platforms

#Plan9

Improve support for Plan9 on i386 platforms.

#MacOS (Darwin)

The hints file for darwin has been updated to handle future MacOS versions beyond 10. [GH #17946]

#Discontinued Platforms

#Symbian

Support code relating to Symbian has been removed. Symbian was an operating system for mobile devices. The port was last updated in July 2009, and the platform itself in October 2012.

#Platform-Specific Notes

#DragonFlyBSD

Tests were updated to workaround DragonFlyBSD bugs intc*() functions andctime updates.

#Mac OS X

A number of system libraries no longer exist as actual files on Big Sur, even thoughdlopen will pretend they do, so now we fall back todlopen if a library file can not be found. [GH #18407]

#Windows

Reading non-ASCII characters from the console when its codepage was set to 65001 (UTF-8) was broken due to a bug in Windows. A workaround for this problem has been implemented. [GH #18701]

Building with mingw.org compilers (version 3.4.5 or later) using mingw runtime versions < 3.22 now works again. This was broken in Perl 5.31.4.

Building with mingw.org compilers (version 3.4.5 or later) using mingw runtime versions >= 3.21 now works (for compilers up to version 5.3.0).

Makefile.mk, and thus support for dmake, has been removed. It is still possible to build Perl on Windows using nmake (Makefile) and GNU make (GNUmakefile). [GH #18511]

perl can now be built withUSE_QUADMATH on MS Windows using (32-bit and 64-bit) mingw-w64 ports of gcc. [GH #18465]

Thepl2bat.pl utility now needs touse ExtUtils::PL2Bat. This could cause failures in parallel builds.

Windows now supportssymlink() andreadlink(), andlstat() is no longer an alias forstat(). [GH #18005].

Unlike POSIX systems, creating a symbolic link on Windows requires either elevated privileges or Windows 10 1703 or later with Developer Mode enabled.

stat(), includingstat FILEHANDLE, and lstat() now uses our own implementation that populates the devicedev and inode numbersino returned rather than always returning zero. The number of linksnlink field is now always populated.

${^WIN32_SLOPPY_STAT} previously controlled whether thenlink field was populated requiring a separate Windows API call to fetch, sincenlink and the other information required forstat() is now retrieved in a single API call.

The-r and-w operators now return true for theSTDIN,STDOUT andSTDERR handles. Unfortunately it still won't return true for duplicates of those handles. [GH #8502].

The times returned by stat() and lstat() are no longer incorrect across Daylight Savings Time adjustments. [GH #6080].

-x on a filehandle should now match-x on the corresponding filename on Vista or later. [GH #4145].

-e '"' no longer incorrectly returns true. [GH #12431].

The same manifest is now used for Visual C++ and gcc builds.

Previously, MSVC builds were using the/manifestdependency flag instead of embeddingperlexe.manifest, which caused issues such asGetVersionEx() returning the wrong version number on Windows 10.

#z/OS

The locale categoriesLC_SYNTAX andLC_TOD are now recognized. Perl doesn't do anything with these, except it now allows you to specify them. They are included inLC_ALL.

#Internal Changes

#Selected Bug Fixes

#Known Problems

None

#Errata From Previous Releases

None

#Obituary

Kent Fredric (KENTNL) passed away in February 2021. A native of New Zealand and a self-described "huge geek," Kent was the author or maintainer of 178 CPAN distributions, the Perl maintainer for the Gentoo Linux distribution and a contributor to the Perl core distribution. He is mourned by his family, friends and open source software communities worldwide.

#Acknowledgements

Perl 5.34.0 represents approximately 11 months of development since Perl 5.32.0 and contains approximately 280,000 lines of changes across 2,100 files from 78 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 150,000 lines of changes to 1,300 .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 5.34.0:

Aaron Crane, Adam Hartley, Andy Dougherty, Ben Cornett, Branislav Zahradník, brian d foy, Chris 'BinGOs' Williams, Christian Walde (Mithaldu), Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Book, Daniel Böhmer, Daniel Laügt, Dan Kogai, David Cantrell, David Mitchell, Dominic Hamon, E. Choroba, Ed J, Eric Herman, Eugene Alvin Villar, Felipe Gasper, Giovanni Tataranni, Graham Knop, Graham Ollis, Hauke D, H.Merijn Brand, Hugo van der Sanden, Ichinose Shogo, Ivan Baidakou, Jae Bradley, James E Keenan, Jason McIntosh, jkahrman, John Karr, John Lightsey, Kang-min Liu, Karen Etheridge, Karl Williamson, Keith Thompson, Leon Timmermans, Marc Reisner, Marcus Holland-Moritz, Max Maischein, Michael G Schwern, Nicholas Clark, Nicolas R., Paul Evans, Petr Písař, raiph, Renee Baecker, Ricardo Signes, Richard Leach, Romano, Ryan Voots, Samanta Navarro, Samuel Thibault, Sawyer X, Scott Baker, Sergey Poznyakoff, Sevan Janiyan, Shirakata Kentaro, Shlomi Fish, Sisyphus, Sizhe Zhao, Steve Hay, TAKAI Kousuke, Thibault Duponchelle, Todd Rinaldo, Tomasz Konojacki, Tom Hukins, Tom Stellard, Tony Cook, vividsnow, Yves Orton, Zakariyya Mughal, Михаил Козачков.

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 theAUTHORS file in the Perl source distribution.

#Reporting Bugs

If you find what you think is a bug, you might check the perl bug database athttps://github.com/Perl/perl5/issues. There may also be information athttp://www.perl.org/, the Perl Home Page.

If you believe you have an unreported bug, please open an issue athttps://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 theperlthanks program:

perlthanks

This will send an email to the Perl 5 Porters list with your show of thanks.

#SEE ALSO

TheChanges file for an explanation of how to view exhaustive details on what changed.

TheINSTALL file for how to build Perl.

TheREADME file for general stuff.

TheArtistic andCopying files for copyright information.

Perldoc Browser is maintained by Dan Book (DBOOK). Please contact him via theGitHub issue tracker oremail regarding any issues with the site itself, search, or rendering of documentation.

The Perl documentation is maintained by the Perl 5 Porters in the development of Perl. Please contact them via thePerl issue tracker, themailing list, orIRC to report any issues with the contents or format of the documentation.

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