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            <h1>perl5122delta</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="#Core-Enhancements">Core Enhancements</a><li><a href="#Modules-and-Pragmata">Modules and Pragmata</a><ul><li><a href="#New-Modules-and-Pragmata">New Modules and Pragmata</a><li><a href="#Pragmata-Changes">Pragmata Changes</a><li><a href="#Updated-Modules">Updated Modules</a></ul><li><a href="#Utility-Changes">Utility Changes</a><li><a href="#Changes-to-Existing-Documentation">Changes to Existing Documentation</a><li><a href="#Installation-and-Configuration-Improvements">Installation and Configuration Improvements</a><ul><li><a href="#Configuration-improvements">Configuration improvements</a><li><a href="#Compilation-improvements">Compilation improvements</a></ul><li><a href="#Selected-Bug-Fixes">Selected Bug Fixes</a><li><a href="#Platform-Specific-Notes">Platform Specific Notes</a><ul><li><a href="#AIX">AIX</a><li><a href="#Windows">Windows</a><li><a href="#VMS">VMS</a></ul><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>perl5122delta - what is new for perl v5.12.2</p>
<a name="DESCRIPTION"></a><h1>DESCRIPTION</h1>
<p>This document describes differences between the 5.12.1 release and
the 5.12.2 release.</p>
<p>If you are upgrading from an earlier major version, such as 5.10.1,
first read <a href="perl5120delta.html">perl5120delta</a>, which describes differences between 5.10.1
and 5.12.0, as well as <a href="perl5121delta.html">perl5121delta</a>, which describes earlier changes
in the 5.12 stable release series.</p>
<a name="Incompatible-Changes"></a><h1>Incompatible Changes</h1>
<p>There are no changes intentionally incompatible with 5.12.1. If any exist, they
are bugs and reports are welcome.</p>
<a name="Core-Enhancements"></a><h1>Core Enhancements</h1>
<p>Other than the bug fixes listed below, there should be no user-visible
changes to the core language in this release.</p>
<a name="Modules-and-Pragmata"></a><h1>Modules and Pragmata</h1>
<a name="New-Modules-and-Pragmata"></a><h2>New Modules and Pragmata</h2>
<p>This release does not introduce any new modules or pragmata.</p>
<a name="Pragmata-Changes"></a><h2>Pragmata Changes</h2>
<p>In the previous release, <code class="inline">no <i>VERSION</i>;</code> statements triggered a bug
which could cause <a href="feature.html">feature</a> bundles to be loaded and <a href="strict.html">strict</a> mode to
be enabled unintentionally.</p>
<a name="Updated-Modules"></a><h2>Updated Modules</h2>
<ul>
<li><a name="Carp"></a><b><code class="inline"><span class="w">Carp</span></code>
</b>
<p>Upgraded from version 1.16 to 1.17.</p>
<p><a href="Carp.html">Carp</a> now detects incomplete <a href="functions/caller.html">caller EXPR</a>
overrides and avoids using bogus <code class="inline"><span class="i">@DB::args</span></code>
. To provide backtraces, Carp
relies on particular behaviour of the caller built-in. Carp now detects
if other code has overridden this with an incomplete implementation, and
modifies its backtrace accordingly. Previously incomplete overrides would
cause incorrect values in backtraces (best case), or obscure fatal errors
(worst case)</p>
<p>This fixes certain cases of <code class="inline"><span class="w">Bizarre</span> <span class="w">copy</span> <span class="w">of</span> <span class="w">ARRAY</span></code>
 caused by modules
overriding <code class="inline"><a class="l_k" href="functions/caller.html">caller()</a></code> incorrectly.</p>
</li>
<li><a name="CPANPLUS"></a><b><code class="inline"><span class="w">CPANPLUS</span></code>
</b>
<p>A patch to <i>cpanp-run-perl</i> has been backported from CPANPLUS <code class="inline"><span class="n">0.9004</span></code>
. This
resolves <a href="http://search.cpan.org/perldoc/http:#%2frt.cpan.org%2fPublic%2fBug%2fDisplay.html%3fid%3d55964">RT #55964</a>
and <a href="http://search.cpan.org/perldoc/http:#%2frt.cpan.org%2fPublic%2fBug%2fDisplay.html%3fid%3d57106">RT #57106</a>, both
of which related to failures to install distributions that use
<code class="inline"><span class="w">Module::Install::DSL</span></code>
.</p>
</li>
<li><a name="File%3a%3aGlob"></a><b><code class="inline"><span class="w">File::Glob</span></code>
</b>
<p>A regression which caused a failure to find <code class="inline"><span class="w">CORE::GLOBAL::glob</span></code>
 after
loading <code class="inline"><span class="w">File::Glob</span></code>
 to crash has been fixed.  Now, it correctly falls back
to external globbing via <code class="inline"><span class="w">pp_glob</span></code>
.</p>
</li>
<li><a name="File%3a%3aCopy"></a><b><code class="inline"><span class="w">File::Copy</span></code>
</b>
<p><code class="inline"><span class="i">File::Copy::copy</span><span class="s">(</span><span class="w">FILE</span><span class="cm">,</span> <span class="w">DIR</span><span class="s">)</span></code>
 is now documented.</p>
</li>
<li><a name="File%3a%3aSpec"></a><b><code class="inline"><span class="w">File::Spec</span></code>
</b>
<p>Upgraded from version 3.31 to 3.31_01.</p>
<p>Several portability fixes were made in <code class="inline"><span class="w">File::Spec::VMS</span></code>
: a colon is now
recognized as a delimiter in native filespecs; caret-escaped delimiters are
recognized for better handling of extended filespecs; <code class="inline"><span class="i">catpath</span><span class="s">(</span><span class="s">)</span></code>
 returns
an empty directory rather than the current directory if the input directory
name is empty; <code class="inline"><span class="i">abs2rel</span><span class="s">(</span><span class="s">)</span></code>
 properly handles Unix-style input.</p>
</li>
</ul>
<a name="Utility-Changes"></a><h1>Utility Changes</h1>
<ul>
<li>
<p><i>perlbug</i> now always gives the reporter a chance to change the email address it
guesses for them.</p>
</li>
<li>
<p><i>perlbug</i> should no longer warn about uninitialized values when using the <code class="inline">-d</code>

and <code class="inline">-<span class="w">v</span></code>
 options.</p>
</li>
</ul>
<a name="Changes-to-Existing-Documentation"></a><h1>Changes to Existing Documentation</h1>
<ul>
<li>
<p>The existing policy on backward-compatibility and deprecation has
been added to <a href="perlpolicy.html">perlpolicy</a>, along with definitions of terms like
<i>deprecation</i>.</p>
</li>
<li>
<p><a href="functions/srand.html">srand</a>'s usage has been clarified.</p>
</li>
<li>
<p>The entry for <a href="functions/die.html">die</a> was reorganized to emphasize its
role in the exception mechanism.</p>
</li>
<li>
<p>Perl's <a href="http://search.cpan.org/perldoc/INSTALL">INSTALL</a> file has been clarified to explicitly state that Perl
requires a C89 compliant ANSI C Compiler.</p>
</li>
<li>
<p><a href="IO/Socket.html">IO::Socket</a>'s <code class="inline"><a class="l_k" href="functions/getsockopt.html">getsockopt()</a></code> and <code class="inline"><a class="l_k" href="functions/setsockopt.html">setsockopt()</a></code> have been documented.</p>
</li>
<li>
<p><i>alarm()</i>'s inability to interrupt blocking IO on Windows has been documented.</p>
</li>
<li>
<p><a href="http://search.cpan.org/perldoc/Math::TrulyRandom">Math::TrulyRandom</a> hasn't been updated since 1996 and has been removed
as a recommended solution for random number generation.</p>
</li>
<li>
<p><a href="perlrun.html">perlrun</a> has been updated to clarify the behaviour of octal flags to <i>perl</i>.</p>
</li>
<li>
<p>To ease user confusion, <code class="inline"><span class="i">$#</span></code>
 and <code class="inline"><span class="i">$*</span></code>
, two special variables that were
removed in earlier versions of Perl have been documented.</p>
</li>
<li>
<p>The version of <a href="perlfaq.html">perlfaq</a> shipped with the Perl core has been updated from the
official FAQ version, which is now maintained in the <code class="inline"><span class="w">briandfoy</span>/<span class="w">perlfaq</span></code>

branch of the Perl repository at <a href="git://perl5.git.perl.org/perl.git">git://perl5.git.perl.org/perl.git</a>.</p>
</li>
</ul>
<a name="Installation-and-Configuration-Improvements"></a><h1>Installation and Configuration Improvements</h1>
<a name="Configuration-improvements"></a><h2>Configuration improvements</h2>
<ul>
<li>
<p>The <code class="inline"><span class="w">d_u32align</span></code>
 configuration probe on ARM has been fixed.</p>
</li>
</ul>
<a name="Compilation-improvements"></a><h2>Compilation improvements</h2>
<ul>
<li>
<p>An "<code class="inline"><span class="w">incompatible</span> <span class="w">operand</span> <span class="w">types</span></code>
" error in ternary expressions when building
with <code class="inline"><span class="w">clang</span></code>
 has been fixed.</p>
</li>
<li>
<p>Perl now skips setuid <code class="inline"><span class="w">File::Copy</span></code>
 tests on partitions it detects to be mounted
as <code class="inline"><span class="w">nosuid</span></code>
.</p>
</li>
</ul>
<a name="Selected-Bug-Fixes"></a><h1>Selected Bug Fixes</h1>
<ul>
<li>
<p>A possible segfault in the <code class="inline"><span class="w">T_PRTOBJ</span></code>
 default typemap has been fixed.</p>
</li>
<li>
<p>A possible memory leak when using <a href="functions/caller.html">caller EXPR</a> to set
<code class="inline"><span class="i">@DB::args</span></code>
 has been fixed.</p>
</li>
<li>
<p>Several memory leaks when loading XS modules were fixed.</p>
</li>
<li>
<p><code class="inline"><a class="l_k" href="functions/unpack.html">unpack()</a></code> now handles scalar context correctly for <code class="inline"><span class="i">%32H</span></code>
 and <code class="inline"><span class="i">%32u</span></code>
,
fixing a potential crash.  <code class="inline"><a class="l_k" href="functions/split.html">split()</a></code> would crash because the third item
on the stack wasn't the regular expression it expected.  <code class="inline"><a class="l_k" href="functions/unpack.html">unpack</a><span class="s">(</span><span class="q">&quot;%2H&quot;</span><span class="cm">,</span>
...<span class="s">)</span></code>
 would return both the unpacked result and the checksum on the stack,
as would <code class="inline"><a class="l_k" href="functions/unpack.html">unpack</a><span class="s">(</span><span class="q">&quot;%2u&quot;</span><span class="cm">,</span> ...<span class="s">)</span></code>
.
<a href="http://search.cpan.org/perldoc/http:#%2frt.perl.org%2frt3%2fTicket%2fDisplay.html%3fid%3d73814">[perl #73814]</a></p>
</li>
<li>
<p>Perl now avoids using memory after calling <code class="inline"><span class="i">free</span><span class="s">(</span><span class="s">)</span></code>
 in <i>pp_require</i>
when there are CODEREFs in <code class="inline"><span class="i">@INC</span></code>
.</p>
</li>
<li>
<p>A bug that could cause "<code class="inline"><span class="w">Unknown</span> <span class="w">error</span></code>
" messages when
"<code class="inline"><span class="i">call_sv</span><span class="s">(</span><span class="w">code</span><span class="cm">,</span> <span class="w">G_EVAL</span><span class="s">)</span></code>
" is called from an XS destructor has been fixed.</p>
</li>
<li>
<p>The implementation of the <code class="inline"><a class="l_k" href="functions/open.html">open</a> <span class="i">$fh</span><span class="cm">,</span> <span class="q">&#39;&gt;&#39;</span> \<span class="i">$buffer</span></code>
 feature
now supports get/set magic and thus tied buffers correctly.</p>
</li>
<li>
<p>The <code class="inline"><span class="w">pp_getc</span></code>
, <code class="inline"><span class="w">pp_tell</span></code>
, and <code class="inline"><span class="w">pp_eof</span></code>
 opcodes now make room on the
stack for their return values in cases where no argument was passed in.</p>
</li>
<li>
<p>When matching unicode strings under some conditions inappropriate backtracking would
result in a <code class="inline">Malformed UTF-8 character (fatal)</code> error. This should no longer occur.
See  <a href="http://search.cpan.org/perldoc/http:#%2frt.perl.org%2frt3%2fPublic%2fBug%2fDisplay.html%3fid%3d75680">[perl #75680]</a></p>
</li>
</ul>
<a name="Platform-Specific-Notes"></a><h1>Platform Specific Notes</h1>
<a name="AIX"></a><h2>AIX</h2>
<ul>
<li>
<p><i>README.aix</i> has been updated with information about the XL C/C++ V11 compiler
suite.</p>
</li>
</ul>
<a name="Windows"></a><h2>Windows</h2>
<ul>
<li>
<p>When building Perl with the mingw64 x64 cross-compiler <code class="inline"><span class="w">incpath</span></code>
,
<code class="inline"><span class="w">libpth</span></code>
, <code class="inline"><span class="w">ldflags</span></code>
, <code class="inline"><span class="w">lddlflags</span></code>
 and <code class="inline"><span class="w">ldflags_nolargefiles</span></code>
 values
in <i>Config.pm</i> and <i>Config_heavy.pl</i> were not previously being set
correctly because, with that compiler, the include and lib directories
are not immediately below <code class="inline">$(CCHOME)</code>.</p>
</li>
</ul>
<a name="VMS"></a><h2>VMS</h2>
<ul>
<li>
<p><i>git_version.h</i> is now installed on VMS. This was an oversight in v5.12.0 which
caused some extensions to fail to build.</p>
</li>
<li>
<p>Several memory leaks in <a href="functions/stat.html">stat FILEHANDLE</a> have been fixed.</p>
</li>
<li>
<p>A memory leak in <code class="inline"><span class="i">Perl_rename</span><span class="s">(</span><span class="s">)</span></code>
 due to a double allocation has been
fixed.</p>
</li>
<li>
<p>A memory leak in <code class="inline"><span class="i">vms_fid_to_name</span><span class="s">(</span><span class="s">)</span></code>
 (used by <code class="inline"><span class="i">realpath</span><span class="s">(</span><span class="s">)</span></code>
 and
<code class="inline"><span class="i">realname</span><span class="s">(</span><span class="s">)</span></code>
) has been fixed.</p>
</li>
</ul>
<a name="Acknowledgements"></a><h1>Acknowledgements</h1>
<p>Perl 5.12.2 represents approximately three months of development since
Perl 5.12.1 and contains approximately 2,000 lines of changes across
100 files from 36 authors.</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 5.12.2:</p>
<p>Abigail, &#xc6;var Arnfj&#xf6;r&#xf0; Bjarmason, Ben Morrow, brian d foy, Brian
Phillips, Chas. Owens, Chris 'BinGOs' Williams, Chris Williams,
Craig A. Berry, Curtis Jewell, Dan Dascalescu, David Golden, David
Mitchell, Father Chrysostomos, Florian Ragwitz, George Greer, H.Merijn
Brand, Jan Dubois, Jesse Vincent, Jim Cromie, Karl Williamson, Lars
D&#x26a;&#x1d07;&#x1d04;&#x1d0b;&#x1d0f;&#x1d21; &#x8fea;&#x62c9;&#x65af;, Leon Brocard, Maik Hentsche, Matt S Trout,
Nicholas Clark, Rafael Garcia-Suarez, Rainer Tammer, Ricardo Signes,
Salvador Ortiz Garcia, Sisyphus, Slaven Rezic, Steffen Mueller, Tony Cook,
Vincent Pit and Yves Orton.</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 <a href="http://rt.perl.org/perlbug/">http://rt.perl.org/perlbug/</a> .  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 <b>perlbug</b>
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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