Create new perldelta for 5.19.12 (not that it's expected to exist...)

1 files changed, 243 insertions, 180 deletions

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 2ac78eda52..5242261f01 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -1,102 +1,164 @@
-
 =encoding utf8
 
 =head1 NAME
 
-perldelta - what is new for perl v5.19.11
+[ 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 v5.19.12
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.19.10 release and the 5.19.11
+This document describes differences between the 5.19.11 release and the 5.19.12
 release.
 
-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.
+If you are upgrading from an earlier release such as 5.19.10, first read
+L<perl51911delta>, which describes differences between 5.19.10 and 5.19.11.
 
-=head1 Modules and Pragmata
+=head1 Notice
 
-=head2 New Modules and Pragmata
+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.
+
+[ List each enhancement as a =head2 entry ]
+
+=head1 Security
+
+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.
+
+[ List each security issue as a =head2 entry ]
+
+=head1 Incompatible Changes
+
+XXX For a release on a stable branch, this section aspires to be:
+
+    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.
+
+[ List each incompatible change as a =head2 entry ]
+
+=head1 Deprecations
 
-L<experimental> version 0.007 has been added.
+XXX Any deprecated features, syntax, modules etc. should be listed here.
 
-This pragma provides an easy and convenient way to enable or disable
-experimental features.
+=head2 Module removals
+
+XXX Remove this section if inapplicable.
+
+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.
+
+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.
+
+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.
+
+=over
+
+=item XXX
+
+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
 
-=head2 Updated Modules and Pragmata
+[ List each other deprecation as a =head2 entry ]
+
+=head1 Performance Enhancements
+
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
+
+[ List each enhancement as a =item entry ]
 
 =over 4
 
 =item *
 
-L<Carp> has been upgraded from version 1.33 to 1.3301.
+XXX
 
-No changes have been made to the installed code other than the version bump to
-keep in sync with the latest CPAN release.
+=back
 
-=item *
+=head1 Modules and Pragmata
 
-L<CPAN> has been upgraded from version 2.04-TRIAL to 2.05.
+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.
 
-This fixes L<local::lib> shell variable string output and prevents an endless
-loop when running "notest test Module" for some Module having dependencies.
+[ Within each section, list entries as a =item entry ]
+
+=head2 New Modules and Pragmata
+
+=over 4
 
 =item *
 
-L<DB> has been upgraded from version 1.43 to 1.44.
+XXX
 
-The debugger now correctly restores its input and output filehandles after
-using the pager command.
-[L<perl #121456|https://rt.perl.org/Public/Bug/Display.html?id=121456>]
+=back
+
+=head2 Updated Modules and Pragmata
+
+=over 4
 
 =item *
 
-L<ExtUtils::Install> has been upgraded from version 1.63 to 1.67.
+L<XXX> has been upgraded from version A.xx to B.yy.
+
+=back
 
-When upgrading an already-installed file, L<ExtUtils::Install> could mess up
-the permissions of files if the old versions of files were hard or symbolic
-links.  This has now been fixed.
-[L<perl #72028|https://rt.perl.org/Public/Bug/Display.html?id=72028>]
+=head2 Removed Modules and Pragmata
 
-The MM_TEST_ROOT feature has been removed from the tests.
+=over 4
 
 =item *
 
-L<ExtUtils::MakeMaker> has been upgraded from version 6.92 to 6.94.
+XXX
 
-A regression in MM_Unix.pm has been resolved.
-[L<Issue #96|https://github.com/Perl-Toolchain-Gang/ExtUtils-MakeMaker/issues/96>]
+=back
 
-=item *
+=head1 Documentation
 
-L<Module::CoreList> has been upgraded from version 3.09 to 3.10.
+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>.
 
-The list of Perl versions covered has been updated.
+=head2 New Documentation
 
-=item *
+XXX Changes which create B<new> files in F<pod/> go here.
 
-L<PerlIO> has been upgraded from version 1.08 to 1.09.
+=head3 L<XXX>
 
-The warning about the use of the C<:utf8> layer has been made more prominent.
+XXX Description of the purpose of the new file here
 
-=item *
+=head2 Changes to Existing Documentation
 
-L<Storable> has been upgraded from version 2.48 to 2.49.
+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.
 
-Recognition of tied SVs has been tightened up.
+=head3 L<XXX>
 
-=item *
+=over 4
 
-L<Win32> has been upgraded from version 0.48 to 0.49.
+=item *
 
-This fixes a problem when building with B<gcc> version 4.8.1 from
-L<http://www.mingw.org>.
-[L<cpan #94730|https://rt.cpan.org/Public/Bug/Display.html?id=94730>]
+XXX Description of the change here
 
 =back
 
@@ -106,223 +168,224 @@ 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>.
 
+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.
+
+=head2 New Diagnostics
+
+XXX Newly added diagnostic messages go under here, separated into New Errors
+and New Warnings
+
+=head3 New Errors
+
+=over 4
+
+=item *
+
+XXX L<message|perldiag/"message">
+
+=back
+
+=head3 New Warnings
+
+=over 4
+
+=item *
+
+XXX L<message|perldiag/"message">
+
+=back
+
 =head2 Changes to Existing Diagnostics
 
+XXX Changes (i.e. rewording) of diagnostic messages go here
+
 =over 4
 
 =item *
 
-The now fatal error message C<Character following "\c" must be ASCII> has been
-reworded as C<Character following "\c" must be printable ASCII> to emphasize
-that in C<\cI<X>>, I<X> must be a I<printable (non-control)> ASCII character.
+XXX Describe change here
 
 =back
 
 =head1 Utility Changes
 
-=head2 L<perlbug>
+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>.
+
+[ List utility changes as a =head2 entry for each utility and =item
+entries for each change
+Use L<XXX> with program names to get proper documentation linking. ]
+
+=head2 L<XXX>
 
 =over 4
 
 =item *
 
-L<perlbug> has been modified to supply the report template with CRLF line
-endings on Windows.
-[L<perl #121277|https://rt.perl.org/Public/Bug/Display.html?id=121277>]
+XXX
+
+=back
+
+=head1 Configuration and Compilation
+
+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.
+
+[ List changes as a =item entry ].
+
+=over 4
 
 =item *
 
-L<perlbug> now makes as few assumptions as possible about the encoding of the
-report.  This will likely change in the future to assume UTF-8 by default but
-allow a user override.
+XXX
 
 =back
 
-=head1 Configuration and Compilation
+=head1 Testing
+
+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.
+
+[ List each test improvement as a =item entry ]
 
 =over 4
 
 =item *
 
-By default, B<gcc> 4.9 does some optimizations that break perl.  The B<-fwrapv>
-option disables those optimizations (and probably others), so for B<gcc> 4.9
-(and later, since the optimizations probably won't go away), F<Configure> now
-adds B<-fwrapv> unless the user requests B<-fno-wrapv>, which disables
-B<-fwrapv>, or B<-fsanitize=undefined>, which turns the overflows B<-fwrapv>
-ignores into runtime errors.  (This is not done prior to B<gcc> 4.3, since
-B<-fwrapv> was broken then.)
-[L<perl #121505|https://rt.perl.org/Public/Bug/Display.html?id=121505>]
+XXX
 
 =back
 
 =head1 Platform Support
 
-=head2 Platform-Specific Notes
+XXX Any changes to platform support should be listed in the sections below.
+
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
+
+=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 VMS
-
-On VMS only, a check for glob metacharacters in a path returned by the
-L<C<glob()>|perlfunc/glob> operator has been replaced with a check for VMS
-wildcard characters.  This saves a significant number of unnecessary
-L<C<lstat()>|perlfunc/lstat> calls such that some simple glob operations become
-60-80% faster.
-
-=item Win32
-
-The time taken to build perl on Windows has been reduced quite significantly
-(time savings in the region of 30-40% are typically seen) by reducing the
-number of, usually failing, I/O calls for each L<C<require()>|perlfunc/require>
-(for B<miniperl.exe> only).
-[L<perl #121119|https://rt.perl.org/Public/Bug/Display.html?id=121119>]
-
-About 15 minutes of idle sleeping was removed from running C<make test> due to
-a bug in which the timeout monitor used for tests could not be cancelled once
-the test completes, and the full timeout period elapsed before running the next
-test file.
-[L<perl #121395|https://rt.perl.org/Public/Bug/Display.html?id=121395>]
-
-On a perl built without pseudo-fork (pseudo-fork builds were not affected by
-this bug), killing a process tree with L<C<kill()>|perlfunc/kill> and a negative
-signal resulted in C<kill()> inverting the returned value.  For example, if
-C<kill()> killed 1 process tree PID then it returned 0 instead of 1, and if
-C<kill()> was passed 2 invalid PIDs then it returned 2 instead of 0.  This has
-probably been the case since the process tree kill feature was implemented on
-Win32.  It has now been corrected to follow the documented behaviour.
-[L<perl #121230|https://rt.perl.org/Public/Bug/Display.html?id=121230>]
-
-When building a 64-bit perl, an uninitialized memory read in B<miniperl.exe>,
-used during the build process, could lead to a 4GB B<wperl.exe> being created.
-This has now been fixed.  (Note that B<perl.exe> itself was unaffected, but
-obviously B<wperl.exe> would have been completely broken.)
-[L<perl #121471|https://rt.perl.org/Public/Bug/Display.html?id=121471>]
-
-Perl can now be built with B<gcc> version 4.8.1 from L<http://www.mingw.org>.
-This was previously broken due to an incorrect definition of DllMain() in one
-of perl's source files.  Earlier B<gcc> versions were also affected when using
-version 4 of the w32api package.  Versions of B<gcc> available from
-L<http://mingw-w64.sourceforge.net/> were not affected.
-[L<perl #121643|https://rt.perl.org/Public/Bug/Display.html?id=121643>]
-
-The test harness now has no failures when perl is built on a FAT drive with the
-Windows OS on an NTFS drive.
-[L<perl #21442|https://rt.perl.org/Public/Bug/Display.html?id=21442>]
+=item XXX-some-platform
+
+XXX
 
 =back
 
-=head1 Internal Changes
+=head2 Discontinued Platforms
+
+XXX List any platforms that this version of perl no longer compiles on.
 
 =over 4
 
-=item *
+=item XXX-some-platform
 
-C<LC_NUMERIC> is now initialized to the C locale.  This affects only XS
-modules, as the Perl core usages always make sure this locale category is
-correctly set for their purposes.  XS code remains vulnerable to other code
-changing this category's locale.  Further fixes are planned in Perl 5.22 to
-reduce these long-standing vulnerabilities.
-[L<perl #121317|https://rt.perl.org/Public/Bug/Display.html?id=121317>]
+XXX
 
 =back
 
-=head1 Selected Bug Fixes
+=head2 Platform-Specific Notes
+
+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.
 
 =over 4
 
-=item *
+=item XXX-some-platform
+
+XXX
 
-A regression involving the string value of L<C<$!>|perlvar/$!> introduced in
-Perl 5.19.2 has been reverted for Perl 5.20.
-[L<perl #119499|https://rt.perl.org/Public/Bug/Display.html?id=119499>]
+=back
 
-This re-breaks the bugs it fixed,
-L<perl #112208|https://rt.perl.org/Public/Bug/Display.html?id=112208>, so an
-alternative fix is planned for Perl 5.22
+=head1 Internal Changes
 
-=item *
+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.
 
-A regression was introduced in Perl 5.19.10 that under some circumstances
-caused C<//m> matches to falsely fail.  Now fixed.
-[L<perl #121484|https://rt.perl.org/Public/Bug/Display.html?id=121484>]
+[ List each change as a =item entry ]
+
+=over 4
 
 =item *
 
-A regression was introduced in the fix for
-L<perl #116192|https://rt.perl.org/Public/Bug/Display.html?id=116192> that
-prevented C<perl -I /somedir/> (with a trailing slash) from finding .pmc files.
-This has been fixed.
-[L<perl #121512|https://rt.perl.org/Public/Bug/Display.html?id=121512>].
+XXX
 
-=item *
+=back
 
-Fixed a bug detected by valgrind where sv_pvn_force_flags() would check SvPVX()
-even when the SV hadn't been upgraded to a SVt_PV.  SvPVX() is only initialized
-when the SV is upgraded to a SVt_PV or higher.
-[L<perl #121366|https://rt.perl.org/Public/Bug/Display.html?id=121366>]
+=head1 Selected Bug Fixes
+
+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>.
+
+[ List each fix as a =item entry ]
+
+=over 4
 
 =item *
 
-Fixed a bug in L<C<caller()>|perlfunc/caller> introduced in Perl 5.18.0.  In
-some circumstances when C<caller()> was called on an C<eval STRING> stack frame
-it would attempt to allocate the limit of the address space minus one, which
-would croak with an out of memory error, which would be caught by the eval.  A
-change in Perl 5.19.1 which increased allocation sizes to allow COW to operate
-more often rounded that allocation size up and wrapped to a zero allocation
-size, resulting in a crash when the source string was copied over.
-[L<perl #120998|https://rt.perl.org/Public/Bug/Display.html?id=120998>].
+XXX
 
 =back
 
 =head1 Known Problems
 
+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.
+
+[ List each fix as a =item entry ]
+
 =over 4
 
 =item *
 
-One test in F<ext/POSIX/t/time.t> is known to fail on Windows when building
-with certain versions of B<gcc> from L<http://www.mingw.org> due to a known bug
-in the MinGW build, which is logged here:
-L<http://sourceforge.net/p/mingw/bugs/2152/>.
+XXX
 
 =back
 
-=head1 Acknowledgements
+=head1 Errata From Previous Releases
 
-Perl 5.19.11 represents approximately 4 weeks of development since Perl 5.19.10
-and contains approximately 3,600 lines of changes across 140 files from 18
-authors.
+=over 4
 
-Excluding auto-generated files, documentation and release tools, there were
-approximately 850 lines of changes to 72 .pm, .t, .c and .h files.
+=item *
 
-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 5.19.11:
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
 
-Aaron Crane, Chris 'BinGOs' Williams, Craig A. Berry, Daniel Dragan, David
-Golden, David Mitchell, H.Merijn Brand, Hiroo Hayashi, Karl Williamson, Matthew
-Horsfall, Ricardo Signes, Shirakata Kentaro, Smylers, Steve Hay, Thomas Sibley,
-Tony Cook, Zefram, Ævar Arnfjörð Bjarmason.
+=back
 
-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 Obituary
+
+XXX If any significant core contributor has died, we've added a short obituary
+here.
+
+=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 v5.19.11..HEAD
 
 =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.
+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