5 perldelta - what is new for perl v5.17.9
9 This document describes differences between the 5.17.8 release and the 5.17.9
12 If you are upgrading from an earlier release such as 5.17.7, first read
13 L<perl5178delta>, which describes differences between 5.17.7 and 5.17.8.
15 =head1 Core Enhancements
17 =head2 Interpolations now Accepted in Regular Expression Set Operations
19 Perl v5.17.8 introduced L<regular expression set operations|perlre/(?[ ])>.
20 They have now been expanded to allow the interpolation of a
21 previously-compiled set into a bigger set, like this:
23 my $thai_or_lao = qr/\p{Thai} + \p{Lao}/;
25 qr/(?[ \p{Digit} & $thai_or_lao ])/;
27 =head1 Incompatible Changes
29 =head2 C<$ENV{foo} = undef> no longer deletes value from environ
31 5.17.3 Introduced a change where assiging C<undef> to an C<%ENV> key was equivalent
32 to C<delete $ENV{foo}>.
34 This release reverts that change.
38 The deprecation of lexical C<$_> in 5.17.7 has been commuted. The feature
39 is now marked experimental.
41 =head2 Deprecated pragma
47 This module is deprecated under perl 5.18. It uses a mechanism provided by
48 perl that is deprecated under 5.18 and higher, and may be removed in a
53 =head2 Deprecated Modules
55 The following modules will be removed from the core distribution in a
56 future release, and should be installed from CPAN instead. Distributions
57 on CPAN which require these should add them to their prerequisites. The
58 core versions of these modules C<warnings> will issue a deprecation warning.
60 You can silence these deprecation warnings by installing the modules
61 in question from CPAN.
65 =item L<Archive::Extract>
69 =item L<B::Lint::Debug>
73 =item L<CPANPLUS::Backend>
75 =item L<CPANPLUS::Backend::RV>
77 =item L<CPANPLUS::Config>
79 =item L<CPANPLUS::Config::HomeEnv>
81 =item L<CPANPLUS::Configure>
83 =item C<CPANPLUS::Configure::Setup>
85 =item L<CPANPLUS::Dist>
87 =item L<CPANPLUS::Dist::Autobundle>
89 =item L<CPANPLUS::Dist::Base>
91 =item L<CPANPLUS::Dist::Build>
93 =item L<CPANPLUS::Dist::Build::Constants>
95 =item L<CPANPLUS::Dist::MM>
97 =item L<CPANPLUS::Dist::Sample>
99 =item L<CPANPLUS::Error>
101 =item L<CPANPLUS::Internals>
103 =item C<CPANPLUS::Internals::Constants>
105 =item C<CPANPLUS::Internals::Constants::Report>
107 =item L<CPANPLUS::Internals::Extract>
109 =item L<CPANPLUS::Internals::Fetch>
111 =item L<CPANPLUS::Internals::Report>
113 =item L<CPANPLUS::Internals::Search>
115 =item L<CPANPLUS::Internals::Source>
117 =item L<CPANPLUS::Internals::Source::Memory>
119 =item L<CPANPLUS::Internals::Source::SQLite>
121 =item C<CPANPLUS::Internals::Source::SQLite::Tie>
123 =item L<CPANPLUS::Internals::Utils>
125 =item C<CPANPLUS::Internals::Utils::Autoflush>
127 =item L<CPANPLUS::Module>
129 =item L<CPANPLUS::Module::Author>
131 =item L<CPANPLUS::Module::Author::Fake>
133 =item L<CPANPLUS::Module::Checksums>
135 =item L<CPANPLUS::Module::Fake>
137 =item C<CPANPLUS::Module::Signature>
139 =item L<CPANPLUS::Selfupdate>
141 =item L<CPANPLUS::Shell>
143 =item L<CPANPLUS::Shell::Classic>
145 =item L<CPANPLUS::Shell::Default>
147 =item L<CPANPLUS::Shell::Default::Plugins::CustomSource>
149 =item L<CPANPLUS::Shell::Default::Plugins::Remote>
151 =item L<CPANPLUS::Shell::Default::Plugins::Source>
153 =item L<Devel::InnerPackage>
155 =item L<Log::Message>
157 =item L<Log::Message::Config>
159 =item L<Log::Message::Handlers>
161 =item L<Log::Message::Item>
163 =item L<Log::Message::Simple>
165 =item L<Module::Pluggable>
167 =item L<Module::Pluggable::Object>
169 =item L<Object::Accessor>
173 =item L<Term::UI::History>
177 =head3 Deprecated Utilities
179 The following utilities will be removed from the core distribution in a
180 future release as their associated modules have been deprecated. They
181 will remain available with the applicable CPAN distribution.
187 Included with L<CPANPLUS>.
189 =item C<cpanp-run-perl>
191 Included with L<CPANPLUS>.
195 Included with L<CPANPLUS>.
199 The L<Pod::LaTeX> module was deprecated with 5.17.8.
203 =head2 Five additional characters should be escaped in patterns with C</x>
205 When a regular expression pattern is compiled with C</x>, Perl treats 6
206 characters as white space to ignore, such as SPACE and TAB. However,
207 Unicode recommends 11 characters be treated thusly. In preparation to
208 conforming with this in a future Perl version, in the meantime, use of
209 any of the missing characters will raise a deprecation warning, unless
210 turned off. The five characters are:
212 U+200E LEFT-TO-RIGHT MARK,
213 U+200F RIGHT-TO-LEFT MARK,
214 U+2028 LINE SEPARATOR,
216 U+2029 PARAGRAPH SEPARATOR.
218 =head1 Modules and Pragmata
220 =head2 New Modules and Pragmata
226 L<Config::Perl::V> version 0.16 has been added as a dual-lifed module.
227 It provides structured data retrieval of C<perl -V> output including
228 information only known to the C<perl> binary and not available via L<Config>.
232 =head2 Updated Modules and Pragmata
238 L<Archive::Extract> has been upgraded from version 0.62 to 0.68.
240 NOTE: L<Archive::Extract> is deprecated and may be removed from a future version of Perl.
244 L<Attribute::Handlers> has been upgraded from version 0.93 to 0.94.
248 L<B::Lint> has been upgraded from version 1.14 to 1.17.
250 NOTE: L<B::Lint> is deprecated and may be removed from a future version of Perl.
254 L<Benchmark> has been upgraded from version 1.13 to 1.14.
256 The "too few iterations" message is now a warning on STDERR
257 instead of being output on STDOUT.
261 L<bignum> has been upgraded from version 0.31 to 0.32.
265 L<CPAN> has been upgraded from version 1.99_51 to 2.00.
269 L<CPANPLUS> has been upgraded from version 0.9133 to 0.9135.
271 NOTE: L<CPANPLUS> is deprecated and may be removed from a future version of Perl.
275 L<CPANPLUS::Dist::Build> has been upgraded from version 0.68 to 0.70.
277 NOTE: L<CPANPLUS::Dist::Build> is deprecated and may be removed from a future version of Perl.
281 L<Data::Dumper> has been upgraded from version 2.141 to 2.142.
283 Additional tests were added in order to improve statement, branch, condition
284 and subroutine coverage. On the basis of the coverage analysis, some of the
285 internals of Dumper.pm were refactored. Almost all methods are now
290 L<DBM_Filter> has been upgraded from version 0.04 to 0.05.
294 L<Digest::SHA> has been upgraded from version 5.81 to 5.82.
298 L<Encode> has been upgraded from version 2.47 to 2.48.
302 L<ExtUtils::Manifest> has been upgraded from version 1.62 to 1.63.
306 L<File::CheckTree> has been upgraded from version 4.41 to 4.42.
310 L<File::DosGlob> has been upgraded from version 1.09 to 1.10.
314 L<File::Temp> has been upgraded from version 0.22 to 0.22_90
316 Fixes various bugs involving directory removal. Defers unlinking tempfiles if
317 the initial unlink fails, which fixes problems on NFS.
321 L<Filter::Simple> has been upgraded from version 0.88 to 0.89.
325 L<IO> has been upgraded from version 1.26 to 1.27.
329 L<Log::Message> has been upgraded from version 0.04 to 0.06.
331 NOTE: L<Log::Message> is deprecated and may be removed from a future version of Perl.
335 L<Log::Message::Simple> has been upgraded from version 0.08 to 0.10.
337 NOTE: L<Log::Message::Simple> is deprecated and may be removed from a future version of Perl.
341 L<Math::BigInt> has been upgraded from version 1.998 to 1.999.
345 L<Module::CoreList> has been upgraded from version 2.80 to 2.82.
349 L<Module::Load> has been upgraded from version 0.22 to 0.24.
353 L<Module::Pluggable> has been upgraded from version 4.5 to 4.6.
355 NOTE: L<Module::Pluggable> is deprecated and may be removed from a future version of Perl.
359 L<Object::Accessor> has been upgraded from version 0.44 to 0.46.
361 NOTE: L<Object::Accessor> is deprecated and may be removed from a future version of Perl.
365 L<overload> has been upgraded from version 1.20 to 1.21.
369 L<PerlIO::scalar> has been upgraded from version 0.15 to 0.16.
371 The buffer scalar supplied may now only contain code pounts 0xFF or
372 lower. [perl #109828]
376 L<Pod::Checker> has been upgraded from version 1.51 to 1.60.
380 L<Pod::Html> has been upgraded from version 1.17 to 1.18.
384 L<Pod::Parser> has been upgraded from version 1.51 to 1.60.
388 L<Pod::Perldoc> has been upgraded from version 3.17 to 3.19.
392 L<Pod::Usage> has been upgraded from version 1.51 to 1.61.
396 L<SelfLoader> has been upgraded from version 1.20 to 1.21.
400 L<Term::UI> has been upgraded from version 0.32 to 0.34.
402 NOTE: L<Term::UI> is deprecated and may be removed from a future version of Perl.
406 L<Test::Harness> has been upgraded from version 3.25_01 to 3.26.
410 L<Text::Soundex> has been upgraded from version 3.03_01 to 3.04.
414 L<Thread::Queue> has been upgraded from version 3.01 to 3.02.
418 L<Unicode::UCD> has been upgraded from version 0.47 to 0.50.
422 L<warnings> has been upgraded from version 1.16 to 1.17.
426 L<Win32> has been upgraded from version 0.45 to 0.46.
430 L<Win32API::File> has been upgraded from version 0.1200 to 0.1201.
436 =head2 Changes to Existing Documentation
444 A syntax error was fixed in one of illustrative examples.
450 The following additions or changes have been made to diagnostic output,
451 including warnings and fatal error messages. For the complete list of
452 diagnostic messages, see L<perldiag>.
454 =head2 New Diagnostics
462 Strings with code points over 0xFF may not be mapped into in-memory file handles
466 =head2 Changes to Existing Diagnostics
472 The warnings for \b{ and \B{ were added in the 5.17 series; they are a
473 deprecation warning which should be turned off by that category. One
474 should not have to turn off regular regexp warnings as well to get rid
479 =head1 Utility Changes
487 Added C<--feature> switch which lists the first version bundle of each
492 Added C<--upstream> switch which shows if the given module
493 is primarily maintained in perl core or on CPAN and bug tracker URL.
497 =head1 Configuration and Compilation
503 Added C<useversionedarchname> option to Configure
505 When set, it includes 'api_versionstring' in 'archname'. E.g.
506 x86_64-linux-5.13.6-thread-multi. It is unset by default.
508 This feature was requested by Tim Bunce, who observed that
509 INSTALL_BASE creates a library structure that does not
510 differentiate by perl version. Instead, it places architecture
511 specific files in "$install_base/lib/perl5/$archname". This makes
512 it difficult to use a common INSTALL_BASE library path with
513 multiple versions of perl.
515 By setting -Duseversionedarchname, the $archname will be
516 distinct for architecture *and* API version, allowing mixed use of
521 Configure will honour the external C<MAILDOMAIN> environment variable, if set.
525 C<installman> no longer ignores the silent option
529 Both C<META.yml> and C<META.json> files are now included in the distribution.
539 Enable perl core tests to pass when locale support is not available.
541 use L<locale> - this will now die if $Config{d_setlocale} is not true.
542 All tests that use L<locale> will skip if $Config{d_setlocale} is not true.
543 This enables us to pass tests on Android which uses ICU instead of locales.
547 =head1 Platform Support
549 =head2 Platform-Specific Notes
555 The character set for Extended Filename Syntax (EFS) is now enabled by default on
556 VMS. Among other things, this provides better handling of dots in directory names,
557 multiple dots in filenames,and spaces in filenames. To obtain the old behavior,
558 set the logical name C<DECC$EFS_CHARSET> to C<DISABLE>.
562 C<libc_r> was removed from recent versions of MidnightBSD and older versions
563 work better with C<pthread>. Threading is now enabled using C<pthread> which
564 corrects build errors with threading enabled on 0.4-CURRENT.
568 =head1 Internal Changes
574 Synonyms for the misleadingly named C<av_len()> has been created:
575 C<av_top_index()> and C<av_tindex>. All three of these return the
576 number of the highest index in the array, not the number of elements it
577 contains. (The name C<av_top> which was introduced in Perl v.5.17.8 has
582 =head1 Selected Bug Fixes
588 -DPERL_GLOBAL_STRUCT builds now free the global struct B<after>
589 they've finished using it.
593 A trailing '/' on a path in @INC will no longer have an additional '/' appended.
597 The C<:crlf> layer now works when unread data doesn't fit into its own
598 buffer. [perl #112244].
602 C<ungetc()> now handles UTF-8 encoded data. [perl #116322].
606 =head1 Acknowledgements
608 Perl 5.17.9 represents approximately 4 weeks of development since Perl 5.17.8
609 and contains approximately 42,000 lines of changes across 510 files from 35
612 Perl continues to flourish into its third decade thanks to a vibrant community
613 of users and developers. The following people are known to have contributed the
614 improvements that became Perl 5.17.9:
616 Aaron Crane, Alan Haggai Alavi, Alexandr Ciornii, Andy Dougherty, Brad
617 Gilbert, Chris 'BinGOs' Williams, Christian Hansen, Craig A. Berry, Dagfinn
618 Ilmari Mannsåker, Daniel Dragan, Dave Rolsky, David Golden, David Mitchell,
619 Father Chrysostomos, H.Merijn Brand, James E Keenan, Jan Dubois, Jerry D.
620 Hedden, Jess Robinson, Karl Williamson, Kent Fredric, Leon Timmermans, Lucas
621 Holt, Matthew Horsfall, Nicholas Clark, Peter Martini, Rafael Garcia-Suarez,
622 Ricardo Signes, Smylers, Steffen Müller, Steve Hay, Thomas Sibley, Tobias
625 The list above is almost certainly incomplete as it is automatically generated
626 from version control history. In particular, it does not include the names of
627 the (very much appreciated) contributors who reported issues to the Perl bug
630 Many of the changes included in this version originated in the CPAN modules
631 included in Perl's core. We're grateful to the entire CPAN community for
632 helping Perl to flourish.
634 For a more complete list of all of Perl's historical contributors, please see
635 the F<AUTHORS> file in the Perl source distribution.
637 =head1 Reporting Bugs
639 If you find what you think is a bug, you might check the articles recently
640 posted to the comp.lang.perl.misc newsgroup and the perl bug database at
641 http://rt.perl.org/perlbug/ . There may also be information at
642 http://www.perl.org/ , the Perl Home Page.
644 If you believe you have an unreported bug, please run the L<perlbug> program
645 included with your release. Be sure to trim your bug down to a tiny but
646 sufficient test case. Your bug report, along with the output of C<perl -V>,
647 will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
649 If the bug you are reporting has security implications, which make it
650 inappropriate to send to a publicly archived mailing list, then please send it
651 to perl5-security-report@perl.org. This points to a closed subscription
652 unarchived mailing list, which includes all the core committers, who will be
653 able to help assess the impact of issues, figure out a resolution, and help
654 co-ordinate the release of patches to mitigate or fix the problem across all
655 platforms on which Perl is supported. Please only use this address for
656 security issues in the Perl core, not for modules independently distributed on
661 The F<Changes> file for an explanation of how to view exhaustive details on
664 The F<INSTALL> file for how to build Perl.
666 The F<README> file for general stuff.
668 The F<Artistic> and F<Copying> files for copyright information.