PERL52110DELTA(1) Perl Programmers Reference Guide PERL52110DELTA(1)NAMEperl52110delta - what is new for perl v5.21.10
DESCRIPTION
This document describes differences between the 5.21.9 release and the
5.21.10 release.
If you are upgrading from an earlier release such as 5.21.8, first read
perl5219delta, which describes differences between 5.21.8 and 5.21.9.
Incompatible Changes
"(?[...])" operators now follow standard Perl precedence
This experimental feature allows set operations in regular expression
patterns. Prior to this, the intersection operator had the same
precedence as the other binary operators. Now it has higher
precedence. This could lead to different outcomes than existing code
expects (though the documentation has always noted that this change
might happen, recommending fully parenthesizing the expressions). See
"Extended Bracketed Character Classes" in perlrecharclass.
Performance Enhancements
· The functions "utf8::native_to_unicode()" and
"utf8::unicode_to_native()" (see utf8) are now optimized out on
ASCII platforms. There is now not even a minimal performance hit
in writing code portable between ASCII and EBCDIC platforms.
Modules and Pragmata
Updated Modules and Pragmata
· B has been upgraded from version 1.56 to 1.57.
· B::Deparse has been upgraded from version 1.33 to 1.34.
Deparse $#_ as that instead of as $#{_}. [perl #123947]
<https://rt.perl.org/Ticket/Display.html?id=123947>
· Carp has been upgraded from version 1.35 to 1.36.
· CPAN has been upgraded from version 2.05 to 2.10.
· Add support for "Cwd::getdcwd()" and introduce workaround for a
misbehaviour seen on Strawberry Perl 5.20.1.
· Fix "chdir()" after building dependencies bug.
· Introduce experimental support for plugins/hooks.
· Integrate the App::Cpan sources.
· Do not check recursion on optional dependencies.
· Sanity check META.yml to contain a hash. [cpan #95271]
<https://rt.cpan.org/Ticket/Display.html?id=95271>
· CPAN::Meta has been upgraded from version 2.143240 to 2.150001.
· Data::Dumper has been upgraded from version 2.157 to 2.158.
· DB has been upgraded from version 1.07 to 1.08.
· Devel::PPPort has been upgraded from version 3.28 to 3.31.
· DynaLoader has been upgraded from version 1.31 to 1.32.
· Encode has been upgraded from version 2.70 to 2.72.
· encoding has been upgraded from version 2.13 to 2.14.
· Getopt::Long has been upgraded from version 2.43 to 2.45.
· locale has been upgraded from version 1.05 to 1.06.
· Locale::Codes has been upgraded from version 3.33 to 3.34.
· Module::CoreList has been upgraded from version 5.20150220 to
5.20150320.
· parent has been upgraded from version 0.228 to 0.232.
No changes to installed files other than the version bump.
· The PathTools modules have been upgraded from version 3.54 to 3.55.
· Pod::Functions has been upgraded from version 1.08 to 1.09.
· POSIX has been upgraded from version 1.51 to 1.52.
· re has been upgraded from version 0.31 to 0.32.
· sigtrap has been upgraded from version 1.07 to 1.08.
· Term::Complete has been upgraded from version 1.402 to 1.403.
· Test::Simple has been reverted from version 1.301001_098 to
1.001014.
· Text::Balanced has been upgraded from version 2.02 to 2.03.
No changes to installed files other than the version bump.
· Text::ParseWords has been upgraded from version 3.29 to 3.30.
· threads has been upgraded from version 1.96_001 to 2.01.
· Unicode::Collate has been upgraded from version 1.11 to 1.12.
· utf8 has been upgraded from version 1.14 to 1.15.
Documentation
Changes to Existing Documentation
perldata
· Documentation has been added regarding the special floating point
values "Inf" and "NaN".
perlexperiment
· Removed note about "\s" matching "VT" now that it is no longer
experimental.
· Added note that "use re 'strict'" has been introduced
experimentally.
perlpolicy
· The documentation of what to expect to see in future maintenance
releases has been updated. Essentially the same types of changes
will be included as before but with fewer changes that don't affect
the installation or execution of perl.
Diagnostics
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 perldiag.
New Diagnostics
New Errors
· Invalid quantifier in {,} in regex; marked by <-- HERE in m/%s/
(F) The pattern looks like a {min,max} quantifier, but the min or
max could not be parsed as a valid number - either it has leading
zeroes, or it represents too big a number to cope with. The
<-- HERE shows where in the regular expression the problem was
discovered. See perlre.
Testing
· Tests for performance issues have been added in the file
t/perf/taint.t.
Platform Support
New Platforms
z/OS running EBCDIC Code Page 1047
Core perl now works on this EBCDIC platform. Early perls also
worked, but, even though support wasn't officially withdrawn,
recent perls would not compile and run well. Perl 5.20 would work,
but had many bugs which have now been fixed. Many CPAN modules
that ship with Perl still fail tests, including Pod::Simple.
However the version of Pod::Simple currently on CPAN should work;
it was fixed too late to include in Perl 5.22. Work is under way
to fix many of the still-broken CPAN modules, which likely will be
installed on CPAN when completed, so that you may not have to wait
until Perl 5.24 to get a working version.
Platform-Specific Notes
HP-UX
The archname now distinguishes use64bitint from use64bitall.
Internal Changes
· Macros have been created to allow XS code to better manipulate the
POSIX locale category "LC_NUMERIC". See "Locale-related functions
and macros" in perlapi.
· The previous "atoi" et al replacement function, "grok_atou", has
now been superseded by "grok_atoUV". See perlclib for details.
Selected Bug Fixes
· Repeated global pattern matches in scalar context on large tainted
strings were exponentially slow depending on the current match
position in the string. [perl #123202]
<https://rt.perl.org/Ticket/Display.html?id=123202>
· Various crashes due to the parser getting confused by syntax errors
have been fixed. [perl #123801]
<https://rt.perl.org/Ticket/Display.html?id=123801> [perl #123802]
<https://rt.perl.org/Ticket/Display.html?id=123802> [perl #123955]
<https://rt.perl.org/Ticket/Display.html?id=123955> [perl #123995]
<https://rt.perl.org/Ticket/Display.html?id=123995>
· "split" in the scope of lexical $_ has been fixed not to fail
assertions. [perl #123763]
<https://rt.perl.org/Ticket/Display.html?id=123763>
· "my $x : attr" syntax inside various list operators no longer fails
assertions. [perl #123817]
<https://rt.perl.org/Ticket/Display.html?id=123817>
· An @ sign in quotes followed by a non-ASCII digit (which is not a
valid identifier) would cause the parser to crash, instead of
simply trying the @ as literal. This has been fixed. [perl
#123963] <https://rt.perl.org/Ticket/Display.html?id=123963>
· "*bar::=*foo::=*glob_with_hash" has been crashing since Perl 5.14,
but no longer does. [perl #123847]
<https://rt.perl.org/Ticket/Display.html?id=123847>
· "foreach" in scalar context was not pushing an item on to the
stack, resulting in bugs. ("print 4, scalar do { foreach(@x){} } +
1" would print 5.) It has been fixed to return "undef". [perl
#124004] <https://rt.perl.org/Ticket/Display.html?id=124004>
· A memory leak introduced in Perl 5.21.6 has been fixed. [perl
#123922] <https://rt.perl.org/Ticket/Display.html?id=123922>
· A regression in the behaviour of the "readline" built-in function,
caused by the introduction of the "<<>>" operator, has been fixed.
[perl #123990] <https://rt.perl.org/Ticket/Display.html?id=123990>
· Several cases of data used to store environment variable contents
in core C code being potentially overwritten before being used have
been fixed. [perl #123748]
<https://rt.perl.org/Ticket/Display.html?id=123748>
Known Problems
· A goal is for Perl to be able to be recompiled to work reasonably
well on any Unicode version. In Perl 5.22, though, the earliest
such version is Unicode 5.1 (current is 7.0).
· EBCDIC platforms
· Encode and encoding are mostly broken.
· Many cpan modules that are shipped with core show failing
tests.
· "pack"/"unpack" with "U0" format may not work properly.
Acknowledgements
Perl 5.21.10 represents approximately 4 weeks of development since Perl
5.21.9 and contains approximately 170,000 lines of changes across 860
files from 27 authors.
Excluding auto-generated files, documentation and release tools, there
were approximately 170,000 lines of changes to 610 .pm, .t, .c and .h
files.
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 5.21.10:
Chris 'BinGOs' Williams, David Golden, David Mitchell, David Wheeler,
Father Chrysostomos, H.Merijn Brand, Hugo van der Sanden, James E
Keenan, Jarkko Hietaniemi, Jasmine Ngan, Jerry D. Hedden, John
Goodyear, Karen Etheridge, Karl Williamson, Lukas Mai, Matthew
Horsfall, Nicholas Clark, Petr PisaX, Rafael Garcia-Suarez, Reini
Urban, Ricardo Signes, Sawyer X, Steffen Mueller, Steve Hay, Sullivan
Beck, Tony Cook, Vincent Pit.
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.
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 https://rt.perl.org/ . 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@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@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 v5.22.0 2015-05-13 PERL52110DELTA(1)
