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PERL5122DELTA(1)                  Perl Programmers Reference Guide                  PERL5122DELTA(1)



NAME
       perl5122delta - what is new for perl v5.12.2

DESCRIPTION
       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 5.10.0 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 unintentionally.

   Updated Modules
       "Carp"
           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.

       "CPANPLUS"
           A patch to cpanp-run-perl has been backported from CPANPLUS 0.9004. This resolves RT
           #55964 <http://rt.cpan.org/Public/Bug/Display.html?id=55964> and RT #57106
           <http://rt.cpan.org/Public/Bug/Display.html?id=57106>, both of which related to failures
           to install distributions that use "Module::Install::DSL".

       "File::Glob"
           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".

       "File::Copy"
           "File::Copy::copy(FILE, DIR)" is now documented.

       "File::Spec"
           Upgraded from version 3.31 to 3.31_01.

           Several portability fixes were made in "File::Spec::VMS": a colon is now recognized as a
           delimiter in native filespecs; caret-escaped delimiters are recognized for better
           handling of extended filespecs; "catpath()" returns an empty directory rather than the
           current directory if the input directory name is empty; "abs2rel()" properly handles
           Unix-style input.

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

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

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

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

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

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

       •   IO::Socket's "getsockopt()" and "setsockopt()" have been documented.

       •   alarm()'s inability to interrupt blocking IO on Windows has been documented.

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

       •   perlrun has been updated to clarify the behaviour of octal flags to perl.

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

       •   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 <git://perl5.git.perl.org/perl.git>.

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

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

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

Selected Bug Fixes
       •   A possible segfault in the "T_PRTOBJ" default typemap has been fixed.

       •   A possible memory leak when using caller() to set @DB::args has been fixed.

       •   Several memory leaks when loading XS modules were fixed.

       •   "unpack()" now handles scalar context correctly for %32H and %32u, fixing a potential
           crash.  "split()" would crash because the third item on the stack wasn't the regular
           expression it expected.  "unpack("%2H", ...)" would return both the unpacked result and
           the checksum on the stack, as would "unpack("%2u", ...)".  [GH #10257]
           <https://github.com/Perl/perl5/issues/10257>

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

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

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

       •   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 in.

       •   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
           [GH #10434] <https://github.com/Perl/perl5/issues/10434>

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

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

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

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

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

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

Acknowledgements
       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:

       Abigail, Ævar Arnfjörð 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 Dɪᴇᴄᴋᴏᴡ 迪拉斯, 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.

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 http://rt.perl.org/perlbug/ .
       There may also be information at http://www.perl.org/ , 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 perlbug AT perl.org 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 perl5-security-report AT 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.

SEE ALSO
       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 v5.34.0                                 2025-07-25                             PERL5122DELTA(1)