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<h1>perl5212delta</h1>
<!-- -->
<ul><li><a href="#NAME">NAME</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#Core-Enhancements">Core Enhancements</a><ul><li><a href="#Better-heuristics-on-older-platforms-for-determining-locale-UTF8ness">Better heuristics on older platforms for determining locale UTF8ness</a></ul><li><a href="#Security">Security</a><ul><li><a href="#Perl-is-now-always-compiled-with--D_FORTIFY_SOURCE%3d2-if-available">Perl is now always compiled with -D_FORTIFY_SOURCE=2 if available</a></ul><li><a href="#Deprecations">Deprecations</a><ul><li><a href="#%2f%5cC%2f-character-class">/\C/ character class</a></ul><li><a href="#Performance-Enhancements">Performance Enhancements</a><li><a href="#Modules-and-Pragmata">Modules and Pragmata</a><ul><li><a href="#Updated-Modules-and-Pragmata">Updated Modules and Pragmata</a></ul><li><a href="#Documentation">Documentation</a><ul><li><a href="#Changes-to-Existing-Documentation">Changes to Existing Documentation</a></ul><li><a href="#Diagnostics">Diagnostics</a><ul><li><a href="#New-Diagnostics">New Diagnostics</a></ul><li><a href="#Configuration-and-Compilation">Configuration and Compilation</a><li><a href="#Testing">Testing</a><li><a href="#Platform-Support">Platform Support</a><ul><li><a href="#Platform-Specific-Notes">Platform-Specific Notes</a></ul><li><a href="#Internal-Changes">Internal Changes</a><li><a href="#Selected-Bug-Fixes">Selected Bug Fixes</a><li><a href="#Acknowledgements">Acknowledgements</a><li><a href="#Reporting-Bugs">Reporting Bugs</a><li><a href="#SEE-ALSO">SEE ALSO</a></ul><a name="NAME"></a><h1>NAME</h1>
<p>perl5212delta - what is new for perl v5.21.2</p>
<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>This document describes differences between the 5.21.1 release and the 5.21.2
release.</p>
<p>If you are upgrading from an earlier release such as 5.21.0, first read
<a href="perl5211delta.html">perl5211delta</a>, which describes differences between 5.21.0 and 5.21.1.</p>
<a name="Core-Enhancements"></a><h1>Core Enhancements</h1>
<a name="Better-heuristics-on-older-platforms-for-determining-locale-UTF8ness"></a><h2>Better heuristics on older platforms for determining locale UTF8ness</h2>
<p>On platforms that implement neither the C99 standard nor the POSIX 2001
standard, determining if the current locale is UTF8 or not depends on
heuristics. These are improved in this release.</p>
<a name="Security"></a><h1>Security</h1>
<a name="Perl-is-now-always-compiled-with--D_FORTIFY_SOURCE%3d2-if-available"></a><h2>Perl is now always compiled with -D_FORTIFY_SOURCE=2 if available</h2>
<p>The 'code hardening' option called <code class="inline"><span class="w">_FORTIFY_SOURCE</span></code>
, available in
gcc 4.*, is now always used for compiling Perl, if available.</p>
<p>Note that this isn't necessarily a huge step since in many platforms
the step had already been taken several years ago: many Linux
distributions (like Fedora) have been using this option for Perl,
and OS X has enforced the same for many years.</p>
<a name="Deprecations"></a><h1>Deprecations</h1>
<a name="%2f%5cC%2f-character-class"></a><h2><code class="inline"><span class="q">/\C/</span></code>
character class</h2>
<p>This character class, which matches a single byte, even if it appears
in a multi-byte character has been deprecated. Matching single bytes
in a multi-byte character breaks encapsulation, and can corrupt utf8
strings.</p>
<a name="Performance-Enhancements"></a><h1>Performance Enhancements</h1>
<ul>
<li>
<p>Refactoring of <code class="inline"><span class="w">pp_tied</span></code>
and C<code class="inline"><span class="w">pp_ref</span></code>
for small improvements.</p>
</li>
<li>
<p>Pathtools don't try to load XS on miniperl.</p>
</li>
<li>
<p>A typo fix reduces the size of the <code class="inline"><span class="w">OP</span></code>
structure.</p>
</li>
<li>
<p>Hash lookups where the key is a constant is faster.</p>
</li>
</ul>
<a name="Modules-and-Pragmata"></a><h1>Modules and Pragmata</h1>
<a name="Updated-Modules-and-Pragmata"></a><h2>Updated Modules and Pragmata</h2>
<ul>
<li>
<p><a href="arybase.html">arybase</a> has been upgraded from version 0.07 to 0.08.</p>
</li>
<li>
<p><a href="B.html">B</a> has been upgraded from version 1.49 to 1.50.</p>
</li>
<li>
<p><a href="Devel/Peek.html">Devel::Peek</a> has been upgraded from version 1.17 to 1.18.</p>
</li>
<li>
<p><a href="experimental.html">experimental</a> has been upgraded from version 0.007 to 0.008.</p>
</li>
<li>
<p><a href="ExtUtils/Manifest.html">ExtUtils::Manifest</a> has been upgraded from version 1.63 to 1.64.</p>
</li>
<li>
<p><a href="File/Copy.html">File::Copy</a> has been upgraded from version 2.29 to 2.30.</p>
</li>
<li>
<p>The PathTools module collection (<a href="File/Spec.html">File::Spec</a> and friends) has been
upgraded from version 3.48 to 3.49.</p>
</li>
<li>
<p><a href="Filter/Simple.html">Filter::Simple</a> has been upgraded from version 0.91 to 0.92.</p>
</li>
<li>
<p><a href="Hash/Util.html">Hash::Util</a> has been upgraded from version 0.17 to 0.18.</p>
</li>
<li>
<p><a href="IO.html">IO</a> has been upgraded from version 1.32 to 1.33.</p>
</li>
<li>
<p><a href="IO/Socket/IP.html">IO::Socket::IP</a> has been upgraded from version 0.29 to 0.31.</p>
<p>A better fix for subclassing <code class="inline"><a class="l_k" href="functions/connect.html">connect()</a></code>.
<a href="http://search.cpan.org/perldoc/https:#%2frt.cpan.org%2fTicket%2fDisplay.html%3fid%3d95983">[cpan #95983]</a>
<a href="http://search.cpan.org/perldoc/https:#%2frt.cpan.org%2fTicket%2fDisplay.html%3fid%3d97050">[cpan #97050]</a></p>
</li>
<li>
<p><a href="IPC/Open3.html">IPC::Open3</a> has been upgraded from version 1.16 to 1.17.</p>
</li>
<li>
<p><a href="Math/BigInt.html">Math::BigInt</a> has been upgraded from version 1.9995 to 1.9996.</p>
<p>Correct handling of subclasses.
<a href="http://search.cpan.org/perldoc/https:#%2frt.cpan.org%2fTicket%2fDisplay.html%3fid%3d96254">[cpan #96254]</a>
<a href="http://search.cpan.org/perldoc/https:#%2frt.cpan.org%2fTicket%2fDisplay.html%3fid%3d96329">[cpan #96329]</a></p>
</li>
<li>
<p><a href="Module/CoreList.html">Module::CoreList</a> has been upgraded from version 5.021001_01 to 5.021002.</p>
</li>
<li>
<p><a href="Pod/Usage.html">Pod::Usage</a> has been upgraded from version 1.63 to 1.64.</p>
</li>
<li>
<p><a href="POSIX.html">POSIX</a> has been upgraded from version 1.40 to 1.41.</p>
</li>
<li>
<p><a href="threads.html">threads</a> has been upgraded from version 1.94 to 1.95.</p>
</li>
<li>
<p><a href="warnings.html">warnings</a> has been upgraded from version 1.24 to 1.26.</p>
</li>
</ul>
<a name="Documentation"></a><h1>Documentation</h1>
<a name="Changes-to-Existing-Documentation"></a><h2>Changes to Existing Documentation</h2>
<a name="the-perlpolicy-manpage"></a><h3><a href="perlpolicy.html">perlpolicy</a></h3>
<ul>
<li>
<p>We now have a code of conduct for the <i>p5p</i> mailing list, as documented
in <a href="perlpolicy.html#STANDARDS-OF-CONDUCT">STANDARDS OF CONDUCT in perlpolicy</a>.</p>
</li>
</ul>
<a name="the-perlfunc-manpage"></a><h3><a href="perlfunc.html">perlfunc</a></h3>
<ul>
<li>
<p>Improve documentation of <code class="inline"><a class="l_k" href="functions/our.html">our</a></code>.</p>
</li>
</ul>
<a name="the-perlsyn-manpage"></a><h3><a href="perlsyn.html">perlsyn</a></h3>
<ul>
<li>
<p>The empty conditional in <code class="inline">for</code>
and <code class="inline">while</code>
is now documented
in <a href="perlsyn.html">perlsyn</a>.</p>
</li>
</ul>
<a name="Diagnostics"></a><h1>Diagnostics</h1>
<a name="New-Diagnostics"></a><h2>New Diagnostics</h2>
<a name="New-Warnings"></a><h3>New Warnings</h3>
<ul>
<li>
<p><a href="perldiag.html#Argument-%22%25s%22-treated-as-0-in-increment-(%2b%2b)">Argument %s treated as 0 in increment (++)</a></p>
<p>(W numeric) The indicated string was fed as an argument to the <code class="inline">++</code>
operator
which expects either a number or a string matching <code class="inline"><span class="q">/^[a-zA-Z]*[0-9]*\z/</span></code>
.
See <a href="perlop.html#Auto-increment-and-Auto-decrement">Auto-increment and Auto-decrement in perlop</a> for details.</p>
</li>
<li>
<p><a href="perldiag.html#Redundant-argument-in-%25s">Redundant argument in %s</a></p>
<p>(W redundant) You called a function with more arguments than other
arguments you supplied indicated would be needed. Currently only
emitted when a printf-type format required fewer arguments than were
supplied, but might be used in the future for e.g. <a href="functions/pack.html">pack</a>.</p>
<p>The warnings category <code class="inline"><span class="w">redundant</span></code>
is new. See also [RT #121025]</p>
</li>
</ul>
<a name="Configuration-and-Compilation"></a><h1>Configuration and Compilation</h1>
<ul>
<li>
<p>A new compilation flag, <code class="inline">-<span class="w">DPERL_OP_PARENT</span></code>
is available. For details,
see the discussion below at <a href="#Internal-Changes">Internal Changes</a>.</p>
</li>
</ul>
<a name="Testing"></a><h1>Testing</h1>
<ul>
<li>
<p><code class="inline"><span class="w">test</span>.<span class="w">pl</span></code>
now allows <code class="inline"><span class="w">plan</span> <span class="w">skip_all</span> <span class="cm">=></span> <span class="i">$reason</span></code>
, to make it
more compatible with <code class="inline"><span class="w">Test::More</span></code>
.</p>
</li>
</ul>
<a name="Platform-Support"></a><h1>Platform Support</h1>
<a name="Platform-Specific-Notes"></a><h2>Platform-Specific Notes</h2>
<ul>
<li><a name="Solaris"></a><b>Solaris</b>
<p>Builds on Solaris 10 with <code class="inline">-<span class="w">Dusedtrace</span></code>
would fail early since make
didn't follow implied dependencies to build <code class="inline"><span class="w">perldtrace</span>.<span class="w">h</span></code>
. Added an
explicit dependency to <code class="inline"><span class="w">depend</span></code>
.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d120120">[perl #120120]</a></p>
</li>
</ul>
<a name="Internal-Changes"></a><h1>Internal Changes</h1>
<ul>
<li>
<p>The following private API functions had their context parameter removed,
<code class="inline"><span class="w">Perl_cast_ulong</span></code>
, <code class="inline"><span class="w">Perl_cast_i32</span></code>
, <code class="inline"><span class="w">Perl_cast_iv</span></code>
, <code class="inline"><span class="w">Perl_cast_uv</span></code>
,
<code class="inline"><span class="w">Perl_cv_const_sv</span></code>
, <code class="inline"><span class="w">Perl_mg_find</span></code>
, <code class="inline"><span class="w">Perl_mg_findext</span></code>
, <code class="inline"><span class="w">Perl_mg_magical</span></code>
,
<code class="inline"><span class="w">Perl_mini_mktime</span></code>
, <code class="inline"><span class="w">Perl_my_dirfd</span></code>
, <code class="inline"><span class="w">Perl_sv_backoff</span></code>
, <code class="inline"><span class="w">Perl_utf8_hop</span></code>
.</p>
<p>Users of the public API prefix-less calls remain unaffected.</p>
</li>
<li>
<p>Experimental support for ops in the optree to be able to locate their
parent, if any. A general-purpose function, <code class="inline"><span class="i">op_sibling_splice</span><span class="s">(</span><span class="s">)</span></code>
allows for general manipulating an <code class="inline"><span class="w">op_sibling</span></code>
chain. The last op
in such a chain is now marked with the field <code class="inline"><span class="w">op_lastsib</span></code>
.</p>
<p>A new build define, <code class="inline">-<span class="w">DPERL_OP_PARENT</span></code>
has been added; if
given, it forces the core to use <code class="inline"><span class="w">op_lastsib</span></code>
to detect the
last sibling in a chain, freeing the last <code class="inline"><span class="w">op_sibling</span></code>
pointer,
which then points back to the parent (instead of being <code class="inline"><span class="w">NULL</span></code>
).</p>
<p>A C-level <code class="inline"><span class="i">op_parent</span><span class="s">(</span><span class="s">)</span></code>
function, and a <code class="inline"><span class="w">B</span></code>
<code class="inline"><span class="i">parent</span><span class="s">(</span><span class="s">)</span></code>
method
have been added; under a default build, they return <code class="inline"><span class="w">NULL</span></code>
, but when
<code class="inline">-<span class="w">DPERL_OP_PARENT</span></code>
has been set, they return the parent of the current op.</p>
</li>
</ul>
<a name="Selected-Bug-Fixes"></a><h1>Selected Bug Fixes</h1>
<ul>
<li>
<p><code class="inline"><a class="l_k" href="functions/s.html">s///e</a></code> on tainted utf8 strings got <code class="inline"><a class="l_k" href="functions/pos.html">pos()</a></code> messed up. This bug,
introduced in 5.20, is now fixed. [RT #122148]</p>
</li>
<li>
<p>A non-word boundary in a regular expression (<code class="inline">\<span class="w">B</span></code>
) did not always
match the end of the string; in particular <code class="inline"><span class="q">q{}</span> =~ <span class="q">/\B/</span></code>
did not
match. This bug, introduced in perl 5.14, is now fixed. [RT #122090]</p>
</li>
<li>
<p><code class="inline"><span class="q">" P"</span> =~ <span class="q">/(?=.*P)P/</span></code>
should match, but did not. This is now fixed.
[RT #122171].</p>
</li>
</ul>
<a name="Acknowledgements"></a><h1>Acknowledgements</h1>
<p>Perl 5.21.2 represents approximately 4 weeks of development since Perl 5.21.1
and contains approximately 11,000 lines of changes across 220 files from 27
authors.</p>
<p>Excluding auto-generated files, documentation and release tools, there were
approximately 5,700 lines of changes to 140 .pm, .t, .c and .h files.</p>
<p>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 5.21.2:</p>
<p>Aaron Crane, Abhijit Menon-Sen, Abigail, Alexandr Ciornii, brian d foy, Brian
Fraser, Chris 'BinGOs' Williams, Craig A. Berry, Daniel Dragan, David Golden,
David Mitchell, Dmitri Tikhonov, George Greer, H.Merijn Brand, James E Keenan,
Jarkko Hietaniemi, Karen Etheridge, Karl Williamson, Matthew Horsfall, Peter
John Acklam, Peter Martini, Reini Urban, Ricardo Signes, Steve Hay, Tony Cook,
Yves Orton, Ævar Arnfjörð Bjarmason.</p>
<p>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.</p>
<p>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.</p>
<p>For a more complete list of all of Perl's historical contributors, please see
the <i>AUTHORS</i> file in the Perl source distribution.</p>
<a name="Reporting-Bugs"></a><h1>Reporting Bugs</h1>
<p>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
<a href="http://www.perl.org/">http://www.perl.org/</a> , the Perl Home Page.</p>
<p>If you believe you have an unreported bug, please run the <a href="perlbug.html">perlbug</a> 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 <code class="inline"><span class="w">perl</span> -<span class="w">V</span></code>
,
will be sent off to perlbug@perl.org to be analysed by the Perl porting team.</p>
<p>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.</p>
<a name="SEE-ALSO"></a><h1>SEE ALSO</h1>
<p>The <i>Changes</i> file for an explanation of how to view exhaustive details on
what changed.</p>
<p>The <i>INSTALL</i> file for how to build Perl.</p>
<p>The <i>README</i> file for general stuff.</p>
<p>The <i>Artistic</i> and <i>Copying</i> files for copyright information.</p>
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