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            <h1>perl5201delta</h1>


  <!--    -->
<ul><li><a href="#NAME">NAME</a><li><a href="#DESCRIPTION">DESCRIPTION</a><li><a href="#Incompatible-Changes">Incompatible Changes</a><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="#Changes-to-Existing-Diagnostics">Changes to Existing Diagnostics</a></ul><li><a href="#Configuration-and-Compilation">Configuration and Compilation</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>perl5201delta - what is new for perl v5.20.1</p>
<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>This document describes differences between the 5.20.0 release and the 5.20.1
release.</p>
<p>If you are upgrading from an earlier release such as 5.18.0, first read
<a href="perl5200delta.html">perl5200delta</a>, which describes differences between 5.18.0 and 5.20.0.</p>
<a name="Incompatible-Changes"></a><h1>Incompatible Changes</h1>
<p>There are no changes intentionally incompatible with 5.20.0.  If any exist,
they are bugs, and we request that you submit a report.  See <a href="#Reporting-Bugs">Reporting Bugs</a>
below.</p>
<a name="Performance-Enhancements"></a><h1>Performance Enhancements</h1>
<ul>
<li>
<p>An optimization to avoid problems with COW and deliberately overallocated PVs
has been disabled because it interfered with another, more important,
optimization, causing a slowdown on some platforms.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121975">[perl #121975]</a></p>
</li>
<li>
<p>Returning a string from a lexical variable could be slow in some cases.  This
has now been fixed.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121977">[perl #121977]</a></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="Config/Perl/V.html">Config::Perl::V</a> has been upgraded from version 0.20 to 0.22.</p>
<p>The list of Perl versions covered has been updated and some flaws in the
parsing have been fixed.</p>
</li>
<li>
<p><a href="Exporter.html">Exporter</a> has been upgraded from version 5.70 to 5.71.</p>
<p>Illegal POD syntax in the documentation has been corrected.</p>
</li>
<li>
<p><a href="ExtUtils/CBuilder.html">ExtUtils::CBuilder</a> has been upgraded from version 0.280216 to 0.280217.</p>
<p>Android builds now link to both <b>-lperl</b> and <code class="inline"><span class="i">$Config::Config</span>{<span class="w">perllibs</span>}</code>
.</p>
</li>
<li>
<p><a href="File/Copy.html">File::Copy</a> has been upgraded from version 2.29 to 2.30.</p>
<p>The documentation now notes that <code class="inline"><span class="w">copy</span></code>
 will not overwrite read-only files.</p>
</li>
<li>
<p><a href="Module/CoreList.html">Module::CoreList</a> has been upgraded from version 3.11 to 5.020001.</p>
<p>The list of Perl versions covered has been updated.</p>
</li>
<li>
<p>The PathTools module collection has been upgraded from version 3.47 to 3.48.</p>
<p>Fallbacks are now in place when cross-compiling for Android and
<code class="inline"><span class="i">$Config::Config</span>{<span class="w">sh</span>}</code>
 is not yet defined.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121963">[perl #121963]</a></p>
</li>
<li>
<p><a href="PerlIO/via.html">PerlIO::via</a> has been upgraded from version 0.14 to 0.15.</p>
<p>A minor portability improvement has been made to the XS implementation.</p>
</li>
<li>
<p><a href="Unicode/UCD.html">Unicode::UCD</a> has been upgraded from version 0.57 to 0.58.</p>
<p>The documentation includes many clarifications and fixes.</p>
</li>
<li>
<p><a href="utf8.html">utf8</a> has been upgraded from version 1.13 to 1.13_01.</p>
<p>The documentation has some minor formatting improvements.</p>
</li>
<li>
<p><a href="version.html">version</a> has been upgraded from version 0.9908 to 0.9909.</p>
<p>External libraries and Perl may have different ideas of what the locale is.
This is problematic when parsing version strings if the locale's numeric
separator has been changed.  Version parsing has been patched to ensure it
handles the locales correctly.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121930">[perl #121930]</a></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-perlapi-manpage"></a><h3><a href="perlapi.html">perlapi</a></h3>
<ul>
<li>
<p><code class="inline"><span class="w">av_len</span></code>
 - Emphasize that this returns the highest index in the array, not the
size of the array.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d120386">[perl #120386]</a></p>
</li>
<li>
<p>Note that <code class="inline"><span class="w">SvSetSV</span></code>
 doesn't do set magic.</p>
</li>
<li>
<p><code class="inline"><span class="w">sv_usepvn_flags</span></code>
 - Fix documentation to mention the use of <code class="inline"><span class="w">NewX</span></code>
 instead of
<code class="inline"><span class="w">malloc</span></code>
.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121869">[perl #121869]</a></p>
</li>
<li>
<p>Clarify where <code class="inline"><span class="w">NUL</span></code>
 may be embedded or is required to terminate a string.</p>
</li>
</ul>
<a name="the-perlfunc-manpage"></a><h3><a href="perlfunc.html">perlfunc</a></h3>
<ul>
<li>
<p>Clarify the meaning of <code class="inline">-B</code>
 and <code class="inline">-T</code>
.</p>
</li>
<li>
<p><code class="inline">-l</code>
 now notes that it will return false if symlinks aren't supported by the
file system.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121523">[perl #121523]</a></p>
</li>
<li>
<p>Note that <code class="inline"><a class="l_k" href="functions/each.html">each</a></code>, <code class="inline"><a class="l_k" href="functions/keys.html">keys</a></code> and <code class="inline"><a class="l_k" href="functions/values.html">values</a></code> may produce different orderings for
tied hashes compared to other perl hashes.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121404">[perl #121404]</a></p>
</li>
<li>
<p>Note that <code class="inline"><a class="l_k" href="functions/exec.html">exec</a> <span class="i">LIST</span></code>
 and <code class="inline"><a class="l_k" href="functions/system.html">system</a> <span class="i">LIST</span></code>
 may fall back to the shell on Win32.
Only <code class="inline"><a class="l_k" href="functions/exec.html">exec</a> <span class="i">PROGRAM</span> <span class="w">LIST</span></code>
 and <code class="inline"><a class="l_k" href="functions/system.html">system</a> <span class="i">PROGRAM</span> <span class="w">LIST</span></code>
 indirect object syntax
will reliably avoid using the shell.  This has also been noted in <a href="perlport.html">perlport</a>.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d122046">[perl #122046]</a></p>
</li>
<li>
<p>Clarify the meaning of <code class="inline"><a class="l_k" href="functions/our.html">our</a></code>.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d122132">[perl #122132]</a></p>
</li>
</ul>
<a name="the-perlguts-manpage"></a><h3><a href="perlguts.html">perlguts</a></h3>
<ul>
<li>
<p>Explain various ways of modifying an existing SV's buffer.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d116925">[perl #116925]</a></p>
</li>
</ul>
<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-perlre-manpage"></a><h3><a href="perlre.html">perlre</a></h3>
<ul>
<li>
<p>The <code class="inline">/x</code> modifier has been clarified to note that comments cannot be continued
onto the next line by escaping them.</p>
</li>
</ul>
<a name="the-perlsyn-manpage"></a><h3><a href="perlsyn.html">perlsyn</a></h3>
<ul>
<li>
<p>Mention the use of empty conditionals in <code class="inline">for</code>
/<code class="inline">while</code>
 loops for infinite
loops.</p>
</li>
</ul>
<a name="the-perlxs-manpage"></a><h3><a href="perlxs.html">perlxs</a></h3>
<ul>
<li>
<p>Added a discussion of locale issues in XS code.</p>
</li>
</ul>
<a name="Diagnostics"></a><h1>Diagnostics</h1>
<p>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 <a href="perldiag.html">perldiag</a>.</p>
<a name="Changes-to-Existing-Diagnostics"></a><h2>Changes to Existing Diagnostics</h2>
<ul>
<li>
<p><a href="perldiag.html#Variable-length-lookbehind-not-implemented-in-regex-m%2f%25s%2f">Variable length lookbehind not implemented in regex m/%s/</a></p>
<p>Information about Unicode behaviour has been added.</p>
</li>
</ul>
<a name="Configuration-and-Compilation"></a><h1>Configuration and Compilation</h1>
<ul>
<li>
<p>Building Perl no longer writes to the source tree when configured with
<i>Configure</i>'s <b>-Dmksymlinks</b> option.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d121585">[perl #121585]</a></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="Android"></a><b>Android</b>
<p>Build support has been improved for cross-compiling in general and for Android
in particular.</p>
</li>
<li><a name="OpenBSD"></a><b>OpenBSD</b>
<p>Corrected architectures and version numbers used in configuration hints when
building Perl.</p>
</li>
<li><a name="Solaris"></a><b>Solaris</b>
<p><b>c99</b> options have been cleaned up, hints look for <b>solstudio</b> as well as
<b>SUNWspro</b>, and support for native <code class="inline"><span class="w">setenv</span></code>
 has been added.</p>
</li>
<li><a name="VMS"></a><b>VMS</b>
<p>An old bug in feature checking, mainly affecting pre-7.3 systems, has been
fixed.</p>
</li>
<li><a name="Windows"></a><b>Windows</b>
<p><code class="inline"><span class="i">%I64d</span></code>
 is now being used instead of <code class="inline"><span class="i">%lld</span></code>
 for MinGW.</p>
</li>
</ul>
<a name="Internal-Changes"></a><h1>Internal Changes</h1>
<ul>
<li>
<p>Added <a href="perlapi.html#sync_locale">sync_locale in perlapi</a>.
Changing the program's locale should be avoided by XS code.  Nevertheless,
certain non-Perl libraries called from XS, such as <code class="inline"><span class="w">Gtk</span></code>
 do so.  When this
happens, Perl needs to be told that the locale has changed.  Use this function
to do so, before returning to Perl.</p>
</li>
</ul>
<a name="Selected-Bug-Fixes"></a><h1>Selected Bug Fixes</h1>
<ul>
<li>
<p>A bug has been fixed where zero-length assertions and code blocks inside of a
regex could cause <code class="inline"><a class="l_k" href="functions/pos.html">pos</a></code> to see an incorrect value.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d122460">[perl #122460]</a></p>
</li>
<li>
<p>Using <code class="inline"><a class="l_k" href="functions/s.html">s///e</a></code> on tainted utf8 strings could issue bogus "Malformed UTF-8
character (unexpected end of string)" warnings.  This has now been fixed.
<a href="http://search.cpan.org/perldoc/https:#%2frt.perl.org%2fTicket%2fDisplay.html%3fid%3d122148">[perl #122148]</a></p>
</li>
<li>
<p><code class="inline"><a class="l_k" href="functions/system.html">system</a></code> and friends should now work properly on more Android builds.</p>
<p>Due to an oversight, the value specified through <b>-Dtargetsh</b> to <i>Configure</i>
would end up being ignored by some of the build process.  This caused perls
cross-compiled for Android to end up with defective versions of <code class="inline"><a class="l_k" href="functions/system.html">system</a></code>,
<code class="inline"><a class="l_k" href="functions/exec.html">exec</a></code> and backticks: the commands would end up looking for <i>/bin/sh</i> instead
of <i>/system/bin/sh</i>, and so would fail for the vast majority of devices,
leaving <code class="inline"><span class="i">$!</span></code>
 as <code class="inline"><span class="w">ENOENT</span></code>
.</p>
</li>
<li>
<p>Many issues have been detected by <a href="http://search.cpan.org/perldoc/http:#%2fwww.coverity.com%2f">Coverity</a> and 
fixed.</p>
</li>
</ul>
<a name="Acknowledgements"></a><h1>Acknowledgements</h1>
<p>Perl 5.20.1 represents approximately 4 months of development since Perl 5.20.0
and contains approximately 12,000 lines of changes across 170 files from 36
authors.</p>
<p>Excluding auto-generated files, documentation and release tools, there were
approximately 2,600 lines of changes to 110 .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 5.20.1:</p>
<p>Aaron Crane, Abigail, Alberto Sim&#xf5;es, Alexandr Ciornii, Alexandre (Midnite)
Jousset, Andrew Fresh, Andy Dougherty, Brian Fraser, Chris 'BinGOs' Williams,
Craig A. Berry, Daniel Dragan, David Golden, David Mitchell, H.Merijn Brand,
James E Keenan, Jan Dubois, Jarkko Hietaniemi, John Peacock, kafka, Karen
Etheridge, Karl Williamson, Lukas Mai, Matthew Horsfall, Michael Bunk, Peter
Martini, Rafael Garcia-Suarez, Reini Urban, Ricardo Signes, Shirakata Kentaro,
Smylers, Steve Hay, Thomas Sibley, Todd Rinaldo, Tony Cook, Vladimir Marek,
Yves Orton.</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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