--- /dev/null
+=encoding utf8
+
+=head1 NAME
+
+perl51910delta - what is new for perl v5.19.10
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.19.9 release and the 5.19.10
+release.
+
+If you are upgrading from an earlier release such as 5.19.8, first read
+L<perl5199delta>, which describes differences between 5.19.8 and 5.19.9.
+
+=head1 Deprecations
+
+=head2 Discouraged features
+
+=over 4
+
+=item *
+
+The "interpreter-based threads" provided by Perl are not the fast, lightweight
+system for multitasking that one might expect or hope for. Threads are
+implemented in a way that make them easy to misuse. Few people know how to
+use them correctly or will be able to provide help.
+
+The use of interpreter-based threads in perl is officially
+L<discouraged|perlpolicy/discouraged>.
+
+=back
+
+=head1 Performance Enhancements
+
+=over 4
+
+=item *
+
+When doing a global regex match on a string that came from the C<readline>
+or C<E<lt>E<gt>> operator, the data is no longer copied unnecessarily.
+[perl #121259]
+
+=item *
+
+Executing a regex that contains the C<^> anchor (or its variant under the
+C</m> flag) has been made much faster in several situations.
+
+=item *
+
+It is now faster to create certain sorts of lists, including array and hash
+slices.
+
+=item *
+
+The optimisation for arrays indexed with a small constant integer is now
+applied for integers in the range -128..127, rather than 0..255. This should
+speed up Perl code using expressions like C<$x[-1]>, at the expense of
+(presumably much rarer) code using expressions like C<$x[200]>.
+
+=item *
+
+Dereferencing (as in C<$obj-E<gt>[0]> or C<$obj-E<gt>{k}>) is now faster
+when C<$obj> is an instance of a class that has overloaded methods, but
+doesn't overload any of the dereferencing methods C<@{}>, C<%{}>, and so on.
+
+=item *
+
+The first iteration over a large hash (using C<keys> or C<each>) is now
+faster. This is achieved by preallocating the hash's internal iterator
+state, rather than lazily creating it when the hash is first iterated. (For
+small hashes, the iterator is still created only when first needed. The
+assumption is that small hashes are more likely to be used as objects, and
+therefore never allocated. For large hashes, that's less likely to be true,
+and the cost of allocating the iterator is swamped by the cost of allocating
+space for the hash itself.)
+
+=item *
+
+Perl's optimiser no longer skips optimising code that follows certain
+C<eval {}> expressions (including those with an apparent infinite loop).
+
+=item *
+
+The implementation now does a better job of avoiding meaningless work at
+runtime. Internal effect-free "null" operations (created as a side-effect of
+parsing Perl programs) are normally deleted during compilation. That
+deletion is now applied in some situations that weren't previously handled.
+
+=item *
+
+A few micro-optimisations have been applied to performance-sensitive parts
+of the implementation, including subroutine invocation and scope exit.
+
+=item *
+
+Perl now does less disk I/O when dealing with Unicode properties that cover
+up to three ranges of consecutive code points.
+
+=back
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+L<Attribute::Handlers> has been upgraded from version 0.95 to 0.96.
+
+=item *
+
+L<autouse> has been upgraded from version 1.07 to 1.08.
+
+=item *
+
+L<B::Deparse> has been upgraded from version 1.25 to 1.26.
+
+=item *
+
+L<base> has been upgraded from version 2.21 to 2.22.
+
+Co-exist more gracefully with C<CORE::GLOBAL::require>
+overrides. [perl #121196]
+
+=item *
+
+L<Carp> has been upgraded from version 1.32 to 1.33.
+
+=item *
+
+L<charnames> has been upgraded from version 1.39 to 1.40.
+
+=item *
+
+L<CPAN> has been upgraded from version 2.03 to 2.04.
+
+Fixes a bug preventing "force install" from working. [cpan #91706]
+
+Fixes an infinite-loop bug when using the C<make> command in the CPAN
+shell. [cpan #86915]
+
+=item *
+
+L<CPAN::Meta> has been upgraded from version 2.133380 to 2.140640.
+
+Added a C<load_string()> method that guesses whether the string is YAML or JSON.
+
+=item *
+
+L<CPAN::Meta::YAML> has been upgraded from version 0.011 to 0.012.
+
+=item *
+
+L<Data::Dumper> has been upgraded from version 2.150 to 2.151.
+
+=item *
+
+L<Devel::PPPort> has been upgraded from version 3.21 to 3.22.
+
+=item *
+
+L<Digest::SHA> has been upgraded from version 5.87 to 5.88.
+
+=item *
+
+L<ExtUtils::Install> has been upgraded from version 1.62 to 1.63.
+
+=item *
+
+L<ExtUtils::MakeMaker> has been upgraded from version 6.88 to 6.92.
+
+=item *
+
+L<ExtUtils::ParseXS> has been upgraded from version 3.23 to 3.24.
+
+=item *
+
+L<ExtUtils::Typemaps> has been upgraded from version 3.23 to 3.24.
+
+=item *
+
+L<feature> has been upgraded from version 1.35 to 1.36.
+
+=item *
+
+L<File::Find> has been upgraded from version 1.26 to 1.27.
+
+=item *
+
+L<Filter::Simple> has been upgraded from version 0.90 to 0.91.
+
+=item *
+
+L<Hash::Util::FieldHash> has been upgraded from version 1.14 to 1.15.
+
+=item *
+
+L<HTTP::Tiny> has been upgraded from version 0.042 to 0.043.
+
+No longer sends absolute request URI when tunneling SSL via proxy and fixes
+regression in setting host name to verify SSL.
+
+=item *
+
+L<IO> has been upgraded from version 1.30 to 1.31.
+
+=item *
+
+L<IO::Socket::IP> has been upgraded from version 0.28 to 0.29.
+
+=item *
+
+L<Locale::Codes> has been upgraded from version 3.29 to 3.30.
+
+Fixed a problem that was preventing rename_* functions to work. [cpan #92680]
+
+=item *
+
+L<Module::CoreList> has been upgraded from version 3.06 to 3.09.
+
+=item *
+
+L<Module::Load> has been upgraded from version 0.30 to 0.32.
+
+Fix tests to support statically built perls.
+
+=item *
+
+L<mro> has been upgraded from version 1.15 to 1.16.
+
+=item *
+
+L<Parse::CPAN::Meta> has been upgraded from version 1.4413 to 1.4414.
+
+Added C<load_string>, which uses heuristics to guess YAML/JSON content.
+C<load_file> will now attempt to detect YAML/JSON content if the suffix is not
+.json, .yml or .yaml.
+
+=item *
+
+L<Pod::Perldoc> has been upgraded from version 3.21 to 3.23.
+
+=item *
+
+L<POSIX> has been upgraded from version 1.38_02 to 1.38_03.
+
+=item *
+
+L<Thread::Queue> has been upgraded from version 3.02 to 3.05.
+
+=item *
+
+L<threads> has been upgraded from version 1.92 to 1.93.
+
+=item *
+
+L<warnings> has been upgraded from version 1.22 to 1.23.
+
+=item *
+
+L<XS::Typemap> has been upgraded from version 0.12 to 0.13.
+
+=back
+
+=head1 Documentation
+
+=head2 Changes to Existing Documentation
+
+=over 4
+
+=item *
+
+The L<perllexwarn> documentation used to describe the hierarchy of warning
+categories understood by the L<warnings> pragma. That description has now
+been moved to the L<warnings> documentation itself, leaving L<perllexwarn>
+as a stub that points to it. This change consolidates all documentation for
+lexical warnings in a single place.
+
+=back
+
+=head1 Diagnostics
+
+The following changes have been made to diagnostic output,
+including warnings and fatal error messages. For the complete list of
+diagnostic messages, see L<perldiag>.
+
+=head2 Changes to Existing Diagnostics
+
+=over 4
+
+=item *
+
+When C<use re "debug"> executes a regex containing a backreference, the
+debugging output now shows what string is being matched.
+
+=back
+
+=head1 Configuration and Compilation
+
+=over 4
+
+=item *
+
+Where possible, the build now avoids recursive invocations of F<make> when
+building pure-Perl extensions, without removing any parallelism from the
+build. Currently around 80 extensions can be processed directly by the
+F<make_ext.pl> tool, meaning that 80 invocations of F<make> and 160
+invocations of F<miniperl> are no longer made.
+
+=item *
+
+The build system now works correctly when compiling under GCC or Clang with
+link-time optimization enabled (the C<-flto> option). [perl #113022]
+
+=back
+
+=head1 Testing
+
+=over 4
+
+=item *
+
+The test suite no longer fails when the user's interactive shell maintains a
+C<$PWD> environment variable, but the F</bin/sh> used for running tests
+doesn't.
+
+=item *
+
+The C<test.valgrind> make target now allows tests to be run in parallel.
+This target allows Perl's test suite to be run under Valgrind, which detects
+certain sorts of C programming errors, though at significant cost in running
+time. On suitable hardware, allowing parallel execution claws back a lot of
+that additional cost. [perl #121431]
+
+=back
+
+=head1 Platform Support
+
+=head2 Platform-Specific Notes
+
+=over 4
+
+=item Linux
+
+The hints file now looks for C<libgdbm_compat> only if C<libgdbm> itself is
+also wanted. The former is never useful without the latter, and in some
+circumstances, including it could actually prevent building.
+
+=item Mac OS
+
+The build system now honours an C<ld> setting supplied by the user running
+F<Configure>.
+
+=item Win32
+
+Killing a process tree with L<perlfunc/kill> and a negative signal, was broken
+starting in 5.18.0. In this bug, C<kill> always returned 0 for a negative
+signal even for valid PIDs, and no processes were terminated. This has been
+fixed [perl #121230].
+
+=back
+
+=head1 Internal Changes
+
+=over 4
+
+=item *
+
+The Perl core now consistently uses C<av_tindex()> ("the top index of an
+array") as a more clearly-named synonym for C<av_len()>.
+
+=item *
+
+The obscure interpreter variable C<PL_timesbuf> is expected to be removed
+early in the 5.21.x development series, so that Perl 5.22.0 will not provide
+it to XS authors. While the variable still exists in 5.19.10 (and will
+continue to exist in 5.20.0), we hope that this advance warning of the
+deprecation will help anyone who is using that variable.
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+Static builds, as configured with C<-Uusedl> now build
+correctly. [perl #121291]
+
+=item *
+
+Regexes with backreferences nested inside subpattern references now behave
+more consistently: match variables are dynamically scoped during the
+execution of the subpattern call. [perl #121299]
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.19.10 represents approximately 4 weeks of development since Perl 5.19.9
+and contains approximately 13,000 lines of changes across 330 files from 20
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 8,800 lines of changes to 220 .pm, .t, .c and .h files.
+
+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 5.19.10:
+
+Aaron Crane, Andy Dougherty, Aristotle Pagaltzis, Chris 'BinGOs' Williams,
+Craig A. Berry, Daniel Dragan, David Mitchell, Father Chrysostomos, H.Merijn
+Brand, Jerry D. Hedden, Karl Williamson, Matthew Horsfall, Nicholas Clark, Paul
+Johnson, Peter Rabbitson, Ricardo Signes, Steffen Müller, 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 F<AUTHORS> file in the Perl source distribution.
+
+=head1 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
+https://rt.perl.org/ . 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 L<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 C<perl -V>,
+will be sent off to perlbug@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@perl.org. This points to a closed subscription
+unarchived mailing list, which includes all the core committers, who will 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.
+
+=head1 SEE ALSO
+
+The F<Changes> file for an explanation of how to view exhaustive details on
+what changed.
+
+The F<INSTALL> file for how to build Perl.
+
+The F<README> file for general stuff.
+
+The F<Artistic> and F<Copying> files for copyright information.
+
+=cut
=head1 NAME
-perldelta - what is new for perl v5.19.10
+[ this is a template for a new perldelta file. Any text flagged as XXX needs
+to be processed before release. ]
+
+perldelta - what is new for perl v5.19.11
=head1 DESCRIPTION
-This document describes differences between the 5.19.9 release and the 5.19.10
+This document describes differences between the 5.19.10 release and the 5.19.11
release.
-If you are upgrading from an earlier release such as 5.19.8, first read
-L<perl5199delta>, which describes differences between 5.19.8 and 5.19.9.
+If you are upgrading from an earlier release such as 5.19.9, first read
+L<perl51910delta>, which describes differences between 5.19.9 and 5.19.10.
-=head1 Deprecations
+=head1 Notice
-=head2 Discouraged features
+XXX Any important notices here
-=over 4
+=head1 Core Enhancements
-=item *
+XXX New core language features go here. Summarize user-visible core language
+enhancements. Particularly prominent performance optimisations could go
+here, but most should go in the L</Performance Enhancements> section.
-The "interpreter-based threads" provided by Perl are not the fast, lightweight
-system for multitasking that one might expect or hope for. Threads are
-implemented in a way that make them easy to misuse. Few people know how to
-use them correctly or will be able to provide help.
+[ List each enhancement as a =head2 entry ]
-The use of interpreter-based threads in perl is officially
-L<discouraged|perlpolicy/discouraged>.
+=head1 Security
-=back
+XXX Any security-related notices go here. In particular, any security
+vulnerabilities closed should be noted here rather than in the
+L</Selected Bug Fixes> section.
-=head1 Performance Enhancements
+[ List each security issue as a =head2 entry ]
-=over 4
+=head1 Incompatible Changes
-=item *
+XXX For a release on a stable branch, this section aspires to be:
-When doing a global regex match on a string that came from the C<readline>
-or C<E<lt>E<gt>> operator, the data is no longer copied unnecessarily.
-[perl #121259]
+ There are no changes intentionally incompatible with 5.XXX.XXX
+ If any exist, they are bugs, and we request that you submit a
+ report. See L</Reporting Bugs> below.
-=item *
+[ List each incompatible change as a =head2 entry ]
-Executing a regex that contains the C<^> anchor (or its variant under the
-C</m> flag) has been made much faster in several situations.
+=head1 Deprecations
-=item *
+XXX Any deprecated features, syntax, modules etc. should be listed here.
-It is now faster to create certain sorts of lists, including array and hash
-slices.
+=head2 Module removals
-=item *
+XXX Remove this section if inapplicable.
-The optimisation for arrays indexed with a small constant integer is now
-applied for integers in the range -128..127, rather than 0..255. This should
-speed up Perl code using expressions like C<$x[-1]>, at the expense of
-(presumably much rarer) code using expressions like C<$x[200]>.
+The following modules will be removed from the core distribution in a
+future release, and will at that time need to be installed from CPAN.
+Distributions on CPAN which require these modules will need to list them as
+prerequisites.
-=item *
+The core versions of these modules will now issue C<"deprecated">-category
+warnings to alert you to this fact. To silence these deprecation warnings,
+install the modules in question from CPAN.
-Dereferencing (as in C<$obj-E<gt>[0]> or C<$obj-E<gt>{k}>) is now faster
-when C<$obj> is an instance of a class that has overloaded methods, but
-doesn't overload any of the dereferencing methods C<@{}>, C<%{}>, and so on.
+Note that these are (with rare exceptions) fine modules that you are encouraged
+to continue to use. Their disinclusion from core primarily hinges on their
+necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
+not usually on concerns over their design.
-=item *
+=over
-The first iteration over a large hash (using C<keys> or C<each>) is now
-faster. This is achieved by preallocating the hash's internal iterator
-state, rather than lazily creating it when the hash is first iterated. (For
-small hashes, the iterator is still created only when first needed. The
-assumption is that small hashes are more likely to be used as objects, and
-therefore never allocated. For large hashes, that's less likely to be true,
-and the cost of allocating the iterator is swamped by the cost of allocating
-space for the hash itself.)
+=item XXX
-=item *
+XXX Note that deprecated modules should be listed here even if they are listed
+as an updated module in the L</Modules and Pragmata> section.
+
+=back
-Perl's optimiser no longer skips optimising code that follows certain
-C<eval {}> expressions (including those with an apparent infinite loop).
+[ List each other deprecation as a =head2 entry ]
-=item *
+=head1 Performance Enhancements
-The implementation now does a better job of avoiding meaningless work at
-runtime. Internal effect-free "null" operations (created as a side-effect of
-parsing Perl programs) are normally deleted during compilation. That
-deletion is now applied in some situations that weren't previously handled.
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
-=item *
+[ List each enhancement as a =item entry ]
-A few micro-optimisations have been applied to performance-sensitive parts
-of the implementation, including subroutine invocation and scope exit.
+=over 4
=item *
-Perl now does less disk I/O when dealing with Unicode properties that cover
-up to three ranges of consecutive code points.
+XXX
=back
=head1 Modules and Pragmata
-=head2 Updated Modules and Pragmata
+XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
+go here. If Module::CoreList is updated, generate an initial draft of the
+following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
+for important changes should then be added by hand. In an ideal world,
+dual-life modules would have a F<Changes> file that could be cribbed.
-=over 4
+[ Within each section, list entries as a =item entry ]
-=item *
+=head2 New Modules and Pragmata
-L<Attribute::Handlers> has been upgraded from version 0.95 to 0.96.
+=over 4
=item *
-L<autouse> has been upgraded from version 1.07 to 1.08.
+XXX
-=item *
+=back
+
+=head2 Updated Modules and Pragmata
-L<B::Deparse> has been upgraded from version 1.25 to 1.26.
+=over 4
=item *
-L<base> has been upgraded from version 2.21 to 2.22.
+L<XXX> has been upgraded from version A.xx to B.yy.
-Co-exist more gracefully with C<CORE::GLOBAL::require>
-overrides. [perl #121196]
+=back
-=item *
+=head2 Removed Modules and Pragmata
-L<Carp> has been upgraded from version 1.32 to 1.33.
+=over 4
=item *
-L<charnames> has been upgraded from version 1.39 to 1.40.
+XXX
-=item *
+=back
-L<CPAN> has been upgraded from version 2.03 to 2.04.
+=head1 Documentation
-Fixes a bug preventing "force install" from working. [cpan #91706]
+XXX Changes to files in F<pod/> go here. Consider grouping entries by
+file and be sure to link to the appropriate page, e.g. L<perlfunc>.
-Fixes an infinite-loop bug when using the C<make> command in the CPAN
-shell. [cpan #86915]
+=head2 New Documentation
-=item *
+XXX Changes which create B<new> files in F<pod/> go here.
-L<CPAN::Meta> has been upgraded from version 2.133380 to 2.140640.
+=head3 L<XXX>
-Added a C<load_string()> method that guesses whether the string is YAML or JSON.
+XXX Description of the purpose of the new file here
-=item *
+=head2 Changes to Existing Documentation
-L<CPAN::Meta::YAML> has been upgraded from version 0.011 to 0.012.
+XXX Changes which significantly change existing files in F<pod/> go here.
+However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
+section.
-=item *
+=head3 L<XXX>
-L<Data::Dumper> has been upgraded from version 2.150 to 2.151.
+=over 4
=item *
-L<Devel::PPPort> has been upgraded from version 3.21 to 3.22.
+XXX Description of the change here
-=item *
+=back
-L<Digest::SHA> has been upgraded from version 5.87 to 5.88.
+=head1 Diagnostics
-=item *
+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 L<perldiag>.
-L<ExtUtils::Install> has been upgraded from version 1.62 to 1.63.
+XXX New or changed warnings emitted by the core's C<C> code go here. Also
+include any changes in L<perldiag> that reconcile it to the C<C> code.
-=item *
+=head2 New Diagnostics
-L<ExtUtils::MakeMaker> has been upgraded from version 6.88 to 6.92.
+XXX Newly added diagnostic messages go under here, separated into New Errors
+and New Warnings
-=item *
+=head3 New Errors
-L<ExtUtils::ParseXS> has been upgraded from version 3.23 to 3.24.
+=over 4
=item *
-L<ExtUtils::Typemaps> has been upgraded from version 3.23 to 3.24.
-
-=item *
+XXX L<message|perldiag/"message">
-L<feature> has been upgraded from version 1.35 to 1.36.
+=back
-=item *
+=head3 New Warnings
-L<File::Find> has been upgraded from version 1.26 to 1.27.
+=over 4
=item *
-L<Filter::Simple> has been upgraded from version 0.90 to 0.91.
-
-=item *
+XXX L<message|perldiag/"message">
-L<Hash::Util::FieldHash> has been upgraded from version 1.14 to 1.15.
+=back
-=item *
+=head2 Changes to Existing Diagnostics
-L<HTTP::Tiny> has been upgraded from version 0.042 to 0.043.
+XXX Changes (i.e. rewording) of diagnostic messages go here
-No longer sends absolute request URI when tunneling SSL via proxy and fixes
-regression in setting host name to verify SSL.
+=over 4
=item *
-L<IO> has been upgraded from version 1.30 to 1.31.
-
-=item *
+XXX Describe change here
-L<IO::Socket::IP> has been upgraded from version 0.28 to 0.29.
+=back
-=item *
+=head1 Utility Changes
-L<Locale::Codes> has been upgraded from version 3.29 to 3.30.
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
+Most of these are built within the directories F<utils> and F<x2p>.
-Fixed a problem that was preventing rename_* functions to work. [cpan #92680]
+[ List utility changes as a =head3 entry for each utility and =item
+entries for each change
+Use L<XXX> with program names to get proper documentation linking. ]
-=item *
+=head3 L<XXX>
-L<Module::CoreList> has been upgraded from version 3.06 to 3.09.
+=over 4
=item *
-L<Module::Load> has been upgraded from version 0.30 to 0.32.
-
-Fix tests to support statically built perls.
+XXX
-=item *
+=back
-L<mro> has been upgraded from version 1.15 to 1.16.
+=head1 Configuration and Compilation
-=item *
+XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
+go here. Any other changes to the Perl build process should be listed here.
+However, any platform-specific changes should be listed in the
+L</Platform Support> section, instead.
-L<Parse::CPAN::Meta> has been upgraded from version 1.4413 to 1.4414.
+[ List changes as a =item entry ].
-Added C<load_string>, which uses heuristics to guess YAML/JSON content.
-C<load_file> will now attempt to detect YAML/JSON content if the suffix is not
-.json, .yml or .yaml.
+=over 4
=item *
-L<Pod::Perldoc> has been upgraded from version 3.21 to 3.23.
-
-=item *
+XXX
-L<POSIX> has been upgraded from version 1.38_02 to 1.38_03.
+=back
-=item *
+=head1 Testing
-L<Thread::Queue> has been upgraded from version 3.02 to 3.05.
+XXX Any significant changes to the testing of a freshly built perl should be
+listed here. Changes which create B<new> files in F<t/> go here as do any
+large changes to the testing harness (e.g. when parallel testing was added).
+Changes to existing files in F<t/> aren't worth summarizing, although the bugs
+that they represent may be covered elsewhere.
-=item *
+[ List each test improvement as a =item entry ]
-L<threads> has been upgraded from version 1.92 to 1.93.
+=over 4
=item *
-L<warnings> has been upgraded from version 1.22 to 1.23.
+XXX
-=item *
+=back
-L<XS::Typemap> has been upgraded from version 0.12 to 0.13.
+=head1 Platform Support
-=back
+XXX Any changes to platform support should be listed in the sections below.
-=head1 Documentation
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
-=head2 Changes to Existing Documentation
+=head2 New Platforms
+
+XXX List any platforms that this version of perl compiles on, that previous
+versions did not. These will either be enabled by new files in the F<hints/>
+directories, or new subdirectories and F<README> files at the top level of the
+source tree.
=over 4
-=item *
+=item XXX-some-platform
-The L<perllexwarn> documentation used to describe the hierarchy of warning
-categories understood by the L<warnings> pragma. That description has now
-been moved to the L<warnings> documentation itself, leaving L<perllexwarn>
-as a stub that points to it. This change consolidates all documentation for
-lexical warnings in a single place.
+XXX
=back
-=head1 Diagnostics
-
-The following changes have been made to diagnostic output,
-including warnings and fatal error messages. For the complete list of
-diagnostic messages, see L<perldiag>.
+=head2 Discontinued Platforms
-=head2 Changes to Existing Diagnostics
+XXX List any platforms that this version of perl no longer compiles on.
=over 4
-=item *
+=item XXX-some-platform
-When C<use re "debug"> executes a regex containing a backreference, the
-debugging output now shows what string is being matched.
+XXX
=back
-=head1 Configuration and Compilation
-
-=over 4
+=head2 Platform-Specific Notes
-=item *
+XXX List any changes for specific platforms. This could include configuration
+and compilation changes or changes in portability/compatibility. However,
+changes within modules for platforms should generally be listed in the
+L</Modules and Pragmata> section.
-Where possible, the build now avoids recursive invocations of F<make> when
-building pure-Perl extensions, without removing any parallelism from the
-build. Currently around 80 extensions can be processed directly by the
-F<make_ext.pl> tool, meaning that 80 invocations of F<make> and 160
-invocations of F<miniperl> are no longer made.
+=over 4
-=item *
+=item XXX-some-platform
-The build system now works correctly when compiling under GCC or Clang with
-link-time optimization enabled (the C<-flto> option). [perl #113022]
+XXX
=back
-=head1 Testing
+=head1 Internal Changes
-=over 4
+XXX Changes which affect the interface available to C<XS> code go here. Other
+significant internal changes for future core maintainers should be noted as
+well.
-=item *
+[ List each change as a =item entry ]
-The test suite no longer fails when the user's interactive shell maintains a
-C<$PWD> environment variable, but the F</bin/sh> used for running tests
-doesn't.
+=over 4
=item *
-The C<test.valgrind> make target now allows tests to be run in parallel.
-This target allows Perl's test suite to be run under Valgrind, which detects
-certain sorts of C programming errors, though at significant cost in running
-time. On suitable hardware, allowing parallel execution claws back a lot of
-that additional cost. [perl #121431]
+XXX
=back
-=head1 Platform Support
-
-=head2 Platform-Specific Notes
-
-=over 4
-
-=item Linux
+=head1 Selected Bug Fixes
-The hints file now looks for C<libgdbm_compat> only if C<libgdbm> itself is
-also wanted. The former is never useful without the latter, and in some
-circumstances, including it could actually prevent building.
+XXX Important bug fixes in the core language are summarized here. Bug fixes in
+files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
-=item Mac OS
+[ List each fix as a =item entry ]
-The build system now honours an C<ld> setting supplied by the user running
-F<Configure>.
+=over 4
-=item Win32
+=item *
-Killing a process tree with L<perlfunc/kill> and a negative signal, was broken
-starting in 5.18.0. In this bug, C<kill> always returned 0 for a negative
-signal even for valid PIDs, and no processes were terminated. This has been
-fixed [perl #121230].
+XXX
=back
-=head1 Internal Changes
+=head1 Known Problems
-=over 4
+XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
+tests that had to be C<TODO>ed for the release would be noted here. Unfixed
+platform specific bugs also go here.
-=item *
+[ List each fix as a =item entry ]
-The Perl core now consistently uses C<av_tindex()> ("the top index of an
-array") as a more clearly-named synonym for C<av_len()>.
+=over 4
=item *
-The obscure interpreter variable C<PL_timesbuf> is expected to be removed
-early in the 5.21.x development series, so that Perl 5.22.0 will not provide
-it to XS authors. While the variable still exists in 5.19.10 (and will
-continue to exist in 5.20.0), we hope that this advance warning of the
-deprecation will help anyone who is using that variable.
+XXX
=back
-=head1 Selected Bug Fixes
+=head1 Errata From Previous Releases
=over 4
=item *
-Static builds, as configured with C<-Uusedl> now build
-correctly. [perl #121291]
-
-=item *
-
-Regexes with backreferences nested inside subpattern references now behave
-more consistently: match variables are dynamically scoped during the
-execution of the subpattern call. [perl #121299]
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
=back
-=head1 Acknowledgements
-
-Perl 5.19.10 represents approximately 4 weeks of development since Perl 5.19.9
-and contains approximately 13,000 lines of changes across 330 files from 20
-authors.
-
-Excluding auto-generated files, documentation and release tools, there were
-approximately 8,800 lines of changes to 220 .pm, .t, .c and .h files.
+=head1 Obituary
-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 5.19.10:
+XXX If any significant core contributor has died, we've added a short obituary
+here.
-Aaron Crane, Andy Dougherty, Aristotle Pagaltzis, Chris 'BinGOs' Williams,
-Craig A. Berry, Daniel Dragan, David Mitchell, Father Chrysostomos, H.Merijn
-Brand, Jerry D. Hedden, Karl Williamson, Matthew Horsfall, Nicholas Clark, Paul
-Johnson, Peter Rabbitson, Ricardo Signes, Steffen Müller, 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.
+=head1 Acknowledgements
-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.
+XXX Generate this with:
-For a more complete list of all of Perl's historical contributors, please see
-the F<AUTHORS> file in the Perl source distribution.
+ perl Porting/acknowledgements.pl v5.19.10..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / commitdiff