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PERL52111DELTA(1pm)    Perl Programmers Reference Guide    PERL52111DELTA(1pm)


       perl52111delta - what is new for perl v5.21.11


       This document describes differences between the 5.21.10 release and the
       5.21.11 release.

       If you are upgrading from an earlier release such as 5.21.9, first read
       perl52110delta, which describes differences between 5.21.9 and 5.21.10.


   Making all warnings fatal is discouraged
       The documentation for fatal warnings notes that "use warnings FATAL =>
       'all'" is discouraged and provides stronger language about the risks of
       fatal warnings in general.

Modules and Pragmata

   Updated Modules and Pragmata
       o   attributes has been upgraded from version 0.26 to 0.27.

       o   B has been upgraded from version 1.57 to 1.58.

       o   B::Deparse has been upgraded from version 1.34 to 1.35.

           "<<>>" is now correctly deparsed.

       o   Config::Perl::V has been upgraded from version 0.23 to 0.24.

       o   CPAN has been upgraded from version 2.10 to 2.11.

       o   Cwd has been upgraded from version 3.55 to 3.56.

       o   ExtUtils::Miniperl has been upgraded from version 1.04 to 1.05.

       o   ExtUtils::ParseXS has been upgraded from version 3.27 to 3.28.

       o   ExtUtils::Typemaps has been upgraded from version 3.25 to 3.28.

       o   File::Spec has been upgraded from version 3.55 to 3.56.

       o   if has been upgraded from version 0.0603 to 0.0604.

           The documentation now notes that this module also works with "no".

       o   IO::Socket::IP has been upgraded from version 0.36 to 0.37.

       o   Module::CoreList has been upgraded from version 5.20150320 to

           Updated to cover the latest releases of Perl.  Also fixes a
           fencepost error in is_core() and copes with versions that do not
           match x.yyyzzz.

       o has been upgraded from 1.48 to 1.49.

           The debugger would cause an assertion failure.  [perl #124127]

       o   PerlIO::mmap has been upgraded from version 0.013 to 0.014.

       o   utf8 has been upgraded from version 1.15 to 1.16.

           Minor documentation update only.

       o   warnings has been upgraded from version 1.31 to 1.32.


   Changes to Existing Documentation

       o   This document has been significantly updated in the light of recent
           improvements to EBCDIC support.


       o   Mention that "study()" is currently a no-op.


       o   The OOK example has been updated to account for COW changes and a
           change in the storage of the offset.


       o   Documentation has been added illustrating the perils of assuming
           the contents of static memory pointed to by the return values of
           Perl wrappers for C library functions doesn't change.


       o   Out-of-date VMS-specific information has been fixed/simplified.


       o   Advice for how to make sure your strings and regular expression
           patterns are interpreted as Unicode has been revised to account for
           the new Perl 5.22 EBCDIC handling.


       o   Out-of-date and/or incorrect material has been removed.


       o   t/porting/re_context.t has been added to test that utf8 and its
           dependencies only use the subset of the "$1..$n" capture vars that
           Perl_save_re_context() is hard-coded to localize, because that
           function has no efficient way of determining at runtime what vars
           to localize.

Platform Support

   Platform-Specific Notes
           miniperl.exe is now built with "-fno-strict-aliasing", allowing
           64-bit builds to complete on GCC 4.8.  [perl #123976]

           "test-prep" again depends on "test-prep-gcc" for GCC builds.  [perl
           #124221] <>

Internal Changes

       o   Perl 5.21.2 introduced a new build option, "-DPERL_OP_PARENT",
           which causes the last "op_sibling" pointer to refer back to the
           parent rather than being "NULL", and where instead a new flag
           indicates the end of the chain.  In this release, the new
           implementation has been revised; in particular:

           o   On "PERL_OP_PARENT" builds, the "op_sibling" field has been
               renamed "op_sibparent" to reflect its new dual purpose.  Since
               the intention is that this field should primarily be accessed
               via macros, this change should be transparent for code written
               to work under "PERL_OP_PARENT".

           o   The newly-introduced "op_lastsib" flag bit has been renamed
               "op_moresib" and its logic inverted; i.e. it is initialised to
               zero in a new op, and is changed to 1 when an op gains a

           o   The function "Perl_op_parent" is now only available on
               "PERL_OP_PARENT" builds.  Using it on a plain build will be a
               compile-timer error.

           o   Three new macros, "OpMORESIB_set", "OpLASTSIB_set",
               "OpMAYBESIB_set" have been added, which are intended to be a
               low-level portable way to set "op_sibling" / "op_sibparent"
               while also updating "op_moresib".  The first sets the sibling
               pointer to a new sibling, the second makes the op the last
               sibling, and the third conditionally does the first or second
               action.  The "op_sibling_splice()" function is retained as a
               higher-level interface that can also maintain consistency in
               the parent at the same time (e.g. by updating "op_first" and
               "op_last" where appropriate).

           o   The macro "OpSIBLING_set", added in Perl 5.21.2, has been
               removed.  It didn't manipulate "op_moresib" and has been
               superseded by "OpMORESIB_set" et al.

           o   The "op_sibling_splice" function now accepts a null "parent"
               argument where the splicing doesn't affect the first or last
               ops in the sibling chain, and thus where the parent doesn't
               need to be updated accordingly.

Selected Bug Fixes

       o   "pack("D", $x)" and "pack("F", $x)" now zero the padding on x86
           long double builds.  GCC 4.8 and later, under some build options,
           would either overwrite the zero-initialized padding, or bypass the
           initialized buffer entirely.  This caused op/pack.t to fail.  [perl
           #123971] <>

       o   Extending an array cloned from a parent thread could result in
           "Modification of a read-only value attempted" errors when
           attempting to modify the new elements.  [perl #124127]

       o   An assertion failure and subsequent crash with "*x=<y>" has been
           fixed.  [perl #123790]

       o   An optimization for state variable initialization introduced in
           Perl 5.21.6 has been reverted because it was found to exacerbate
           some other existing buggy behaviour.  [perl #124160]

       o   The extension of another optimization to cover more ops in Perl
           5.21 has also been reverted to its Perl 5.20 state as a temporary
           fix for regression issues that it caused.  [perl #123790]

       o   New bitwise ops added in Perl 5.21.9 accidentally caused "$^H |=
           0x1c020000" to enable all features.  This has now been fixed.

       o   A possible crashing/looping bug has been fixed.  [perl #124099]

       o   UTF-8 variable names used in array indexes, unquoted UTF-8 HERE-
           document terminators and UTF-8 function names all now work
           correctly.  [perl #124113]

       o   Breakage in "require(VERSION)" (with parentheses), introduced in
           Perl 5.21.6, has been fixed.  [perl #124135]

       o   Wide char warnings, wrongly raised in UTF-8 locales since Perl
           5.21.8, are now suppressed.  [perl #123527]

       o   A subtle bug introduced in Perl 5.21.4 involving UTF-8 in regular
           expressions and sometimes causing a crash has been fixed.  A new
           test script has been added to test this fix; see under "Testing".
           [perl #124109] <>

       o   A change introduced in Perl 5.21.10 that broke the autovivification
           CPAN module has been reverted.

       o   A bug whereby "'FOO'->f()" lost the read-only status of "FOO",
           introduced in Perl 5.21.7, has been fixed.  [perl #123619]

       o   A regression in Perl 5.21 in the matching of "/[A-Z]/ai" has been


       Perl 5.21.11 represents approximately 4 weeks of development since Perl
       5.21.10 and contains approximately 5,800 lines of changes across 240
       files from 24 authors.

       Excluding auto-generated files, documentation and release tools, there
       were approximately 1,700 lines of changes to 160 .pm, .t, .c and .h

       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 5.21.11:

       Alex Vandiver, Andreas Koenig, Craig A. Berry, Dagfinn Ilmari
       Mannsaaker, Daniel Dragan, David Golden, David Mitchell, Father
       Chrysostomos, H.Merijn Brand, Herbert Breunung, Hugo van der Sanden,
       James E Keenan, James McCoy, Karl Williamson, Matthew Horsfall, Max
       Maischein, Nicholas Clark, Rafael Garcia-Suarez, Randy Stauner, Ricardo
       Signes, Shirakata Kentaro, Steffen Mueller, Steve Hay, Tony Cook.

       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 AUTHORS file in the Perl source distribution.

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 .  There may also be information at , 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 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  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.


       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 v5.22.0                      2015-05-13               PERL52111DELTA(1pm)

perl 5.22 - Generated Fri Aug 14 15:16:20 CDT 2015
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