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perl5121delta - what is new for perl v5.12.1

DESCRIPTION

This document describes differences between the 5.12.0 release and the 5.12.1 release.

If you are upgrading from an earlier release such as 5.10.1, first read perl5120delta,
which describes differences between 5.10.1 and 5.12.0.

Incompatible Changes

There are no changes intentionally incompatible with 5.12.0. If any incompatibilities with
5.12.0 exist, they are bugs. Please report them.

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

Pragmata Changes
· We fixed exporting of "is_strict" and "is_lax" from version.

These were being exported with a wrapper that treated them as method calls, which
caused them to fail. They are just functions, are documented as such, and should
never be subclassed, so this patch just exports them directly as functions without the
wrapper.

Updated Modules
· We upgraded CGI.pm to version 3.49 to incorporate fixes for regressions introduced in
the release we shipped with Perl 5.12.0.

· We upgraded Pod::Simple to version 3.14 to get an improvement to \C\<\< \>\> parsing.

· We made a small fix to the CPANPLUS test suite to fix an occasional spurious test
failure.

· We upgraded Safe to version 2.27 to wrap coderefs returned by "reval()" and "rdo()".

Changes to Existing Documentation

· We added the new maintenance release policy to perlpolicy.pod

· We've clarified the multiple-angle-bracket construct in the spec for POD in
perlpodspec

· We added a missing explanation for a warning about ":=" to perldiag.pod

· We removed a false claim in perlunitut that all text strings are Unicode strings in
Perl.

· We updated the Github mirror link in perlrepository to mirrors/perl, not github/perl

· We fixed a minor error in perl5114delta.pod.

· We replaced a mention of the now-obsolete Switch.pm with given/when.

· We improved documentation about $sitelibexp/sitecustomize.pl in perlrun.

· We corrected perlmodlib.pod which had unintentionally omitted a number of modules.

· We updated the documentation for 'require' in perlfunc.pod relating to putting Perl
code in @INC.

· We reinstated some erroneously-removed documentation about quotemeta in perlfunc.

· We fixed an a2p example in perlutil.pod.

· We filled in a blank in perlport.pod with the release date of Perl 5.12.

· We fixed broken links in a number of perldelta files.

· The documentation for Carp.pm incorrectly stated that the $Carp::Verbose variable
makes cluck generate stack backtraces.

· We fixed a number of typos in Pod::Functions

· We improved documentation of case-changing functions in perlfunc.pod

· We corrected perlgpl.pod to contain the correct version of the GNU General Public
License.

Testing

Testing Improvements
· t/op/sselect.t is now less prone to clock jitter during timing checks on Windows.

sleep() time on Win32 may be rounded down to multiple of the clock tick interval.

· lib/blib.t and lib/locale.t: Fixes for test failures on Darwin/PPC

· perl5db.t: Fix for test failures when "Term::ReadLine::Gnu" is installed.

Installation and Configuration Improvements

Configuration improvements
· We updated INSTALL with notes about how to deal with broken dbm.h on OpenSUSE (and
possibly other platforms)

Bug Fixes

· A bug in how we process filetest operations could cause a segfault. Filetests don't
always expect an op on the stack, so we now use TOPs only if we're sure that we're not
stat'ing the _ filehandle. This is indicated by OPf_KIDS (as checked in ck_ftst).

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=74542>

· When deparsing a nextstate op that has both a change of package (relative to the
previous nextstate) and a label, the package declaration is now emitted first, because
it is syntactically impermissible for a label to prefix a package declaration.

· XSUB.h now correctly redefines fgets under PERL_IMPLICIT_SYS

See also: <http://rt.cpan.org/Public/Bug/Display.html?id=55049>

· utf8::is_utf8 now respects GMAGIC (e.g. $1)

· XS code using "fputc()" or "fputs()": on Windows could cause an error due to their
arguments being swapped.

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=72704>

· We fixed a small bug in lex_stuff_pvn() that caused spurious syntax errors in an
obscure situation. It happened when stuffing was performed on the last line of a file
and the line ended with a statement that lacked a terminating semicolon.

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=74006>

· We fixed a bug that could cause \N{} constructs followed by a single . to be parsed
incorrectly.

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=74978>

· We fixed a bug that caused when(scalar) without an argument not to be treated as a
syntax error.

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=74114>

· We fixed a regression in the handling of labels immediately before string evals that
was introduced in Perl 5.12.0.

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=74290>

· We fixed a regression in case-insensitive matching of folded characters in regular
expressions introduced in Perl 5.10.1.

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=72998>

Platform Specific Notes

HP-UX
· Perl now allows -Duse64bitint without promoting to use64bitall on HP-UX

AIX
· Perl now builds on AIX 4.2

The changes required work around AIX 4.2s' lack of support for IPv6, and limited
support for POSIX "sigaction()".

FreeBSD 7
· FreeBSD 7 no longer contains /usr/bin/objformat. At build time, Perl now skips the
objformat check for versions 7 and higher and assumes ELF.

VMS
· It's now possible to build extensions on older (pre 7.3-2) VMS systems.

DCL symbol length was limited to 1K up until about seven years or so ago, but there
was no particularly deep reason to prevent those older systems from configuring and
building Perl.

· We fixed the previously-broken "-Uuseperlio" build on VMS.

We were checking a variable that doesn't exist in the non-default case of disabling
perlio. Now we only look at it when it exists.

· We fixed the -Uuseperlio command-line option in configure.com.

Formerly it only worked if you went through all the questions interactively and
explicitly answered no.

Known Problems

· "List::Util::first" misbehaves in the presence of a lexical $_ (typically introduced
by "my $_" or implicitly by "given"). The variable which gets set for each iteration
is the package variable $_, not the lexical $_.

A similar issue may occur in other modules that provide functions which take a block
as their first argument, like

foo { ... $_ ...} list

See also: <http://rt.perl.org/rt3/Public/Bug/Display.html?id=67694>

· "Module::Load::Conditional" and "version" have an unfortunate interaction which can
cause "CPANPLUS" to crash when it encounters an unparseable version string. Upgrading
to "CPANPLUS" 0.9004 or "Module::Load::Conditional" 0.38 from CPAN will resolve this
issue.

Acknowledgements

Perl 5.12.1 represents approximately four weeks of development since Perl 5.12.0 and
contains approximately 4,000 lines of changes across 142 files from 28 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 5.12.1:

AEvar Arnfjoer` Bjarmason, Chris Williams, chromatic, Craig A. Berry, David Golden, Father
Chrysostomos, Florian Ragwitz, Frank Wiegand, Gene Sullivan, Goro Fuji, H.Merijn Brand,
James E Keenan, Jan Dubois, Jesse Vincent, Josh ben Jore, Karl Williamson, Leon Brocard,
Michael Schwern, Nga Tang Chan, Nicholas Clark, Niko Tyni, Philippe Bruhat, Rafael Garcia-
Suarez, Ricardo Signes, Steffen Mueller, Todd Rinaldo, Vincent Pit and Zefram.

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@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.

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