This document describes differences between the 5.12.1 release and the
       5.12.2 release.

       If you are upgrading from an earlier major version, such as 5.10.1,
       first read perl5120delta, which describes differences between 5.10.1
       and 5.12.0, as well as perl5121delta, which describes earlier changes
       in the 5.12 stable release series.

Incompatible Changes
       There are no changes intentionally incompatible with 5.12.1. If any
       exist, they are bugs and reports are welcome.

Core Enhancements
       Other than the bug fixes listed below, there should be no user-visible
       changes to the core language in this release.

Modules and Pragmata
   New Modules and Pragmata
       This release does not introduce any new modules or pragmata.

   Pragmata Changes
       In the previous release, "no VERSION;" statements triggered a bug which
       could cause feature bundles to be loaded and strict mode to be enabled

   Updated Modules
           Upgraded from version 1.16 to 1.17.

           Carp now detects incomplete caller() overrides and avoids using
           bogus @DB::args. 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)

           This fixes certain cases of "Bizarre copy of ARRAY" caused by
           modules overriding "caller()" incorrectly.

           A patch to cpanp-run-perl has been backported from CPANPLUS 0.9004.
           This resolves RT #55964
           <> and RT #57106
           <>, both of
           which related to failures to install distributions that use

           A regression which caused a failure to find "CORE::GLOBAL::glob"
           after loading "File::Glob" to crash has been fixed.  Now, it
           correctly falls back to external globbing via "pp_glob".
           properly handles Unix-style input.

Utility Changes
       o   perlbug now always gives the reporter a chance to change the email
           address it guesses for them.

       o   perlbug should no longer warn about uninitialized values when using
           the "-d" and "-v" options.

Changes to Existing Documentation
       o   The existing policy on backward-compatibility and deprecation has
           been added to perlpolicy, along with definitions of terms like

       o   "srand" in perlfunc's usage has been clarified.

       o   The entry for "die" in perlfunc was reorganized to emphasize its
           role in the exception mechanism.

       o   Perl's INSTALL file has been clarified to explicitly state that
           Perl requires a C89 compliant ANSI C Compiler.

       o   IO::Socket's "getsockopt()" and "setsockopt()" have been

       o   alarm()'s inability to interrupt blocking IO on Windows has been

       o   Math::TrulyRandom hasn't been updated since 1996 and has been
           removed as a recommended solution for random number generation.

       o   perlrun has been updated to clarify the behaviour of octal flags to

       o   To ease user confusion, $# and $*, two special variables that were
           removed in earlier versions of Perl have been documented.

       o   The version of perlfaq shipped with the Perl core has been updated
           from the official FAQ version, which is now maintained in the
           "briandfoy/perlfaq" branch of the Perl repository at

Installation and Configuration Improvements
   Configuration improvements
       o   The "d_u32align" configuration probe on ARM has been fixed.

   Compilation improvements
       o   An ""incompatible operand types"" error in ternary expressions when
           building with "clang" has been fixed.

       o   Perl now skips setuid "File::Copy" tests on partitions it detects
           to be mounted as "nosuid".

Selected Bug Fixes
           checksum on the stack, as would "unpack("%2u", ...)".  [perl
           #73814] <>

       o   Perl now avoids using memory after calling "free()" in pp_require
           when there are CODEREFs in @INC.

       o   A bug that could cause ""Unknown error"" messages when
           ""call_sv(code, G_EVAL)"" is called from an XS destructor has been

       o   The implementation of the "open $fh, '>' \$buffer" feature now
           supports get/set magic and thus tied buffers correctly.

       o   The "pp_getc", "pp_tell", and "pp_eof" opcodes now make room on the
           stack for their return values in cases where no argument was passed

       o   When matching unicode strings under some conditions inappropriate
           backtracking would result in a "Malformed UTF-8 character (fatal)"
           error. This should no longer occur.  See  [perl #75680]

Platform Specific Notes
       o   README.aix has been updated with information about the XL C/C++ V11
           compiler suite.

       o   When building Perl with the mingw64 x64 cross-compiler "incpath",
           "libpth", "ldflags", "lddlflags" and "ldflags_nolargefiles" values
           in and were not previously being set
           correctly because, with that compiler, the include and lib
           directories are not immediately below "$(CCHOME)".

       o   git_version.h is now installed on VMS. This was an oversight in
           v5.12.0 which caused some extensions to fail to build.

       o   Several memory leaks in stat() have been fixed.

       o   A memory leak in "Perl_rename()" due to a double allocation has
           been fixed.

       o   A memory leak in "vms_fid_to_name()" (used by "realpath()" and
           "realname()") has been fixed.

       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.

       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:
       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 v5.18.2                      2013-11-04                  PERL5122DELTA(1)
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