perl5261cdelta - what is new for cperl v5.26.1


This document describes the differences between the cperl 5.26.0c and the cperl 5.26.1c releases.

If you are upgrading from an earlier release such as v5.24.2c, first read the perl5260cdelta documentation, which describes differences between v5.24.2c and v5.26.0c

Performance Enhancements

Modules and Pragmata

Updated Modules and Pragmata

Archive::Tar 0.26

'0' is a valid name for an archive, change 'iter' to check definedness. See

B 1.68_07

Add non-destructive $cv->PUREGV method, which does not create a GV from a CvNAMED $cv. Warning: $cv->GV does create a GV from a CvNAMED $cv.

B::C 1.55_04

Protect from destructive $cv->GV, renamed is_lexsub to is_named, allow @0, &0, ... types.

B::Debug 1.25

Deprecated from CORE, will not be in 5.30 anymore. Avoid destructive CvNAMED vivification to GVs. Add cperl features.

Cpanel::JSON::XS 3.0233

MSVC 14.0 support and higher, changed nan in the runtime.

Devel::PPPort 3.36_02

Support strict hashpairs, fix for . in @INC.

Add #if { CPERL && VERSION 5.26.0 }> support, support parser enum expectation.

Encode 2.92

Skip the flapping test t/Aliases.t on threaded smokers, with random segfaults. This is a long standing core bug, with PMOP aliases or clone. First observed at (since 5.6)

Stop directory tweaking $Encode::Encoding{utf8}

Fix gcc warnings for older gcc < 4.0

Where possible do not depend on value of $@, instead use return value of eval

Fix more XS problems in Encode.xs file

Load modules Encode::MIME::Name and Storable normally

Remove no warnings 'redefine'; and correctly loaddependences

Remove PP stubs and reformat predefine_encodings()

Run Encode XS BOOT code at compile time

Use Encode::define_encoding and propagate carp/croak message

cperl fixes: encoding undeprecated, no strict hashpairs

Cleanup code for handling fallback/replacement characters

ExtUtils::CBuilder 0.280226

Fix C++ compiler detection (RT #131749)

ExtUtils::Install 2.14

- Fix tests for when perl path contains a space

- Fix win32 check

- 'make -s' support: set $INSTALL_QUIET automatically

- Optimisations:

  * use our instead of vars
  * lazy load modules
  * make OS variables into constants
  * move some calculations out of a loop

- Removed instructions using Build.PL from README

- Load Win32API::File for _move_file_at_boot only when needed

- Allow disabling autosplit by omitting autosplit dir

ExtUtils::MakeMaker 8.30_04

Merge our fixes to upstream 7.30 (which has e.g. the dlltool mingw fixes). Many fixes were already in, but some new upstream bugs crept in.

Support IO::Scalar handle as $parsefile argument to ExtUtils::MM_Unix::parse_version().

fix Invalid Locale symbol name. Invalid identifier "ENCODING_UTF-8" while "strict names"

fix XSMULTI static with strict linkers, avoid duplicate symbol _boot_XS__Test in: Test.o blib/arch/auto/XS/Test/Test.a(Test.o)

xsstatic: fixup MAKE_APERL_FILE, which was Makefile.aperl.aperl

ExtUtils::ParseXS 3.35_02

Moved xs pods still missing from the CPAN release completely to core.

Bump versions.

File::Path 3.15_01c

Remove erroneous documentation. Correct skip count for Windows. Comment out two TODO tests. Make subdirectory names used in tests more random.

File::Spec::Functions 3.36_05

Bumped version from unparsable 3.3.65, which prevented e.g. File::chdir to install.

Filter::Simple 0.94

Various small documentation fixes. Swap out use for Remove use of deprecated \C regex feature. Filter::Simple was erroneously signalling eof if it encountered a ‘no MyFilter’ right after ‘use’: use MyFilter; no MyFilter; In this case it should simply not filter anything.

Getopt::Long 2.50

Fix bug

Fix bug Unfortunately, this withdraws a small part of fix 114999. GNU getopt_long() does not accept the (optional) argument to be passed to the option without = sign. We do, since not doing so breaks existing scripts.

Provide a default value for options (gnu_compat mode). Thanks to Andrew Gregory.


Bump versions of 3 Socket modules.

IPC::Cmd 0.98

Added wait_loop_callback for run_forked()

Only search in curdir in can_run() when on Win32 RT#105601

JSON::PP 2.94_01

Various, see

Locale::Codes 3.53

Fixed the default error condition in legacy modules.

Math::BigRat 0.2613

Fix problem with second operand being changed in multiplication (CPAN RT #121139).

Memoize 1.03

Skip flapping, timer-sensitive t/expmod_t.t tests on Travis CI.

Net::Ping 2.61

Fix ping_udp for a started udp echo server (PR#5 by Stephan Loyd)

Fix t/400_ping_syn.t phases

Try to handle Windows Socket::getnameinfo errors

Improve some tests on missing network connections

PathTools 4.68c

Add security usage note to File::Spec::no_upwards white space change so can compile under C++11 Protect modules also from . in @INC [perl #127384] (CVE-2016-1238)

Search::Dict 1.07_01

Bump version

SelectSaver 1.02_01

Bump version

Storable 3.05_13

mingw fix: use safe defaults, not segfaulting defaults. mingw fails on the stacksize binary search, leaving it empty.

threads 2.16_01

Fix Clang macro backward compatibility per patch by Andy Grundman. Keep the old better doc. Keep our modglobal fix in global destruction from 2.12_01.

threads::shared 1.57

Fix Clang macro backward compatibility per patch by Andy Grundman. RT #131124 Memory allocation fix.

Time::HiRes 1.9744_01


add more potential clock constants, like CLOCK_MONOTONIC_FAST (available in FreeBSD), and not all potentially found clock constants were properly exported to be available from Perl, see your system's clock_gettime() documentation for the available ones

correct declared minimum Perl version (should be 5.6, was declared as 5.8 since 1.9727_03): blead af94b3ac

merged with our cperl test fixes. See

VMS::Studio 2.41_01

Bump version

Win32API::File 0.1204

Fix xsubpp warnings


Changes to Existing Documentation

perlxs, perlxstut, perlxstypemap

Configuration and Compilation

Utility Changes



Platform-Specific Notes


cperl on mingw was previously unsupported and didn't compile nor work.

The plan is to use mingw 32bit and 64bit packages instead of MSVC compiled packages, which do require a special MS runtime DLL.

Fixed invalid check_type_and_open macro on mingw miniperl.

Fixed upstream mkstemp API changes.

getcwd is deprecated on Windows. use _getcwd() instead.

Selected Bug Fixes


cperl 5.26.1c represents approximately 3 months of development since cperl 5.26.0c and contains approximately 20,000 lines of changes across 170 files from 6 authors.

Excluding auto-generated files, documentation and release tools, there were approximately 1,400 lines of changes to 76 .pm, .t, .c and .h files.

The following people are known to have contributed the improvements that became cperl 5.26.1c:

Reini Urban, Tony Cook, William N. Braswell, Jr, vendethiel, Aaron Crane.

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.

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.

For a more complete list of all of Perl's historical contributors, please see the AUTHORS file in the Perl source distribution.

Generated with:

    cperl Porting/ cperl-5.26.0..HEAD

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 . There may also be information at , the Perl Home Page.

If you believe you have an unreported bug, please run the cperlbug 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 you think it's a cperl specific bug or trust the cperl developers more please file an issue at

If the bug you are reporting has security implications which make it inappropriate to send to a publicly archived mailing list, then see "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec For details of how to report the issue.


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.