2012年6月25日

[installer 3265] perl-5.17.1

perl-5.17.1 出ています。

☆ perl-5.17.1
http://www.perl.com/CPAN/src/
http://www.cpan.org/src/5.0/perl-5.17.1.tar.gz

NAME
perldelta - what is new for perl v5.17.1


DESCRIPTION
This document describes differences between the 5.17.0 release and the
5.17.1 release.

If you are upgrading from an earlier release such as 5.16.0, first read
perl5170delta, which describes differences between 5.16.0 and 5.17.0.

Core Enhancements
More CORE:: subs
Several more built-in functions have been added as subroutines to the
CORE:: namespace, namely, those non-overridable keywords that can be
implemented without custom parsers: "defined", "delete", "exists",
"glob", "pos", "protoytpe", "scalar", "split", "study", and "undef".

As some of these have prototypes, "prototype('CORE::...')" has been
changed to not make a distinction between overridable and
non-overridable keywords. This is to make "prototype('CORE::pos')"
consistent with "prototype(&CORE::pos)".

Incompatible Changes
"/(?{})/" and "/(??{})/" have been heavily reworked
The implementation of this feature has been almost completely rewritten.
Although its main intent is to fix bugs, some behaviors, especially
related to the scope of lexical variables, will have changed. This is
described more fully in the "Selected Bug Fixes" section.

"\N{BELL}" now refers to U+1F514 instead of U+0007
Unicode 6.0 reused the name "BELL" for a different code point than it
traditionally had meant. Since Perl v5.14, use of this name still
referred to U+0007, but would raise a deprecation warning. Now, "BELL"
refers to U+1F514, and the name for U+0007 is "ALERT". All the functions
in charnames have been correspondingly updated.

Alphanumeric operators must now be separated from the closing
delimiter of regular expressions
You may no longer write something like:

m/a/and 1

Instead you must write

m/a/ and 1

with whitespace separating the operator from the closing delimiter of
the regular expression. Not having whitespace has resulted in a
deprecation warning since Perl v5.14.0.

"require" dies for unreadable files
When "require" encounters an unreadable file, it now dies. It used to
ignore the file and continue searching the directories in @INC [perl
#113422].

Upgrade to the Unicode 6.2 beta
Unicode 6.2 is proposing some changes that may very well break some CPAN
modules. The timing of this nicely coincides with Perl's being early in
the release cycle. This commit takes the current beta 6.2, adds the
proposed changes that aren't yet in it, and subtracts the changes that
would affect \X processing, as those turn out to have errors, and may
have to be rethought. Unicode has been notified of these problems.

This will allow us to gather data as to whether or not the proposed
changes cause us problems. These will be presented to Unicode to aid in
their final decision as to whether or not to go forward with the
changes.

These changes will be replaced by the final version of Unicode 6.2
before 5.18.0 is released.

Performance Enhancements
* The "x" repetition operator is now folded to a single constant at
compile time if called in scalar context with constant operands and
no parentheses around the left operand.

Modules and Pragmata
Updated Modules and Pragmata
* Archive::Extract has been upgraded from version 0.58 to 0.60.

Work around an edge case on Linux with Busybox's unzip.

* Archive::Tar has been upgraded from version 1.82 to 1.88.

ptar now supports the -T option as well as dashless options
[rt.cpan.org #75473], [rt.cpan.org #75475].

Auto-encode filenames marked as UTF-8 [rt.cpan.org #75474].

Don't use "tell" on IO::Zlib handles [rt.cpan.org #64339].

Don't try to "chown" on symlinks.

* attributes has been upgraded from version 0.19 to 0.20.

* autodie has been upgraded from version 2.10 to 2.11.

* B has been upgraded from version 1.35 to 1.36.

"B::COP::stashlen" has been replaced with "B::COP::stashoff".

"B::COP::stashpv" now supports UTF-8 package names and embedded
NULs.

* B::Deparse has been upgraded from version 1.14 to 1.15.

Avoid warning when run under "perl -w".

* Class::Struct has been upgraded from version 0.63 to 0.64.

The constructor now respects overridden accessor methods [perl
#29230].

* Compress::Raw::Bzip2 has been upgraded from version 2.048 to 2.052.

* Compress::Raw::Zlib has been upgraded from version 2.048 to 2.054.

Upgrade bundled zlib to version 1.2.7.

Fix build failures on Irix, Solaris, and Win32, and also when
building as C++ [rt.cpan.org #69985], [rt.cpan.org #77030],
[rt.cpan.org #75222].

* CPAN::Meta has been upgraded from version 2.120630 to 2.120921.

* CPAN::Meta::Requirements has been upgraded from version 2.120630 to
2.122.

Treat undef requirements to "from_string_hash" as 0 (with a
warning).

Added "requirements_for_module" method.

* CPAN::Meta::YAML has been upgraded from version 0.007 to 0.008.

* CPANPLUS has been upgraded from version 0.9121 to 0.9130.

Allow adding blib/script to PATH.

Save the history between invocations of the shell.

Handle multiple "makemakerargs" and "makeflags" arguments better.

Use "File::HomeDir" when available, and provide
"PERL5_CPANPLUS_HOME" to override the autodetection.

Always re-fetch CHECKSUMS if "fetchdir" is set.

* Digest::MD5 has been upgraded from version 2.51 to 2.52.

Fix "Digest::Perl::MD5" OO fallback [rt.cpan.org #66634].

* DynaLoader has been upgraded from version 1.14 to 1.15.

This is due to a minor code change in the XS for the VMS
implementation.

* ExtUtils::CBuilder has been upgraded from version 0.280206 to
0.280208.

Manifest files are now correctly embedded for those versions of VC++
which make use of them. [perl #111782, #111798].

* File::DosGlob has been upgraded from version 1.07 to 1.08.

* File::Fetch has been upgraded from version 0.32 to 0.34.

* File::Spec::Unix has been upgraded from version 3.39_02 to 3.39_03.

"abs2rel" could produce incorrect results when given two relative
paths or the root directory twice [perl #111510].

* Filter::Util::Call has been upgraded from version 1.40 to 1.45.

* HTTP::Tiny has been upgraded from version 0.017 to 0.022.

Add SSL verification features [github #6], [github #9].

Include the final URL in the response hashref.

Add "local_address" option.

* IO has been upgraded from version 1.25_06 to 1.25_07.

"sync()" can now be called on read-only file handles [perl #64772].

* IPC::Cmd has been upgraded from version 0.76 to 0.78.

Use "POSIX::_exit" instead of "exit" in "run_forked" [rt.cpan.org
#76901].

* Memoize has been upgraded from version 1.02 to 1.03.

Fix the "MERGE" cache option.

* Module::Build has been upgraded from version 0.39_01 to 0.40.

Fixed bug where modules without $VERSION might have a version of '0'
listed in 'provides' metadata, which will be rejected by PAUSE.

Fixed bug in PodParser to allow numerals in module names.

Fixed bug where giving arguments twice led to them becoming arrays,
resulting in install paths like ARRAY(0xdeadbeef)/lib/Foo.pm.

* Module::CoreList has been upgraded from version 2.67 to 2.68.

* Module::Load::Conditional has been upgraded from version 0.46 to
0.50.

Fix use of "requires" on perls installed to a path with spaces.

* Object::Accessor has been upgraded from version 0.42 to 0.44.

* Params::Check has been upgraded from version 0.32 to 0.36.

* Parse::CPAN::Meta has been upgraded from version 1.4402 to 1.4404.

* PerlIO::mmap has been upgraded from version 0.010 to 0.011.

* PerlIO::via::QuotedPrint has been upgraded from version 0.06 to
0.07.

* Pod::Html has been upgraded from version 1.15_02 to 1.16.

The option "--libpods" has been reinstated. It is deprecated, and
its use does nothing other than issue a warning that it is no longer
supported.

Since the HTML files generated by pod2html claim to have a UTF-8
charset, actually write the files out using UTF-8 [perl #111446].

* POSIX has been upgraded from version 1.30 to 1.31.

* re has been upgraded from version 0.19 to 0.20.

See note about "op_comp" in the "Internal Changes" section below.

* Safe has been upgraded from version 2.31_01 to 2.33_01.

Fix interactions with "Devel::Cover".

Don't eval code under "no strict".

* Scalar::Util has been upgraded from version 1.23 to version 1.25.

Fix an overloading issue with "sum".

"first" and "reduce" now check the callback first (so &first(1) is
disallowed).

Fix "tainted" on magical values [rt.cpan.org #55763].

Fix "sum" on previously magical values [rt.cpan.org #61118].

Fix reading past the end of a fixed buffer [rt.cpan.org #72700].

* Search::Dict has been upgraded from version 1.04 to 1.07.

No longer require "stat" on filehandles.

Use "fc" for casefolding.

* Storable has been upgraded from version 2.35 to 2.36.

* Term::ANSIColor has been upgraded from version 3.01 to 3.02.

Add support for italics.

Improve error handling.

* Test::Harness has been upgraded from version 3.23 to 3.25.

Fix glob semantics on Win32 [rt.cpan.org #49732].

Don't use "Win32::GetShortPathName" when calling perl [rt.cpan.org
#47890].

Ignore -T when reading shebang [rt.cpan.org #64404].

Handle the case where we don't know the wait status of the test more
gracefully.

Make the test summary 'ok' line overridable so that it can be
changed to a plugin to make the output of prove idempotent.

Don't run world-writable files.

* Unicode::UCD has been upgraded from version 0.43 to 0.44.

This adds a function all_casefolds() that returns all the casefolds.

Documentation
Changes to Existing Documentation
perlfaq
* perlfaq has been synchronized with version 5.0150040 from CPAN.

perlcheat
* perlcheat has been reorganized, and a few new sections were added.

Diagnostics
Removals of Diagnostics
* The "Runaway prototype" warning that occurs in bizarre cases has
been removed as being unhelpful and inconsistent.

* The "Not a format reference" error has been removed, as the only
case in which it could be triggered was a bug.

* The "Unable to create sub named %s" error has been removed for the
same reason.

Platform Support
Platform-Specific Notes
Win32
"link" on Win32 now attempts to set $! to more appropriate values
based on the Win32 API error code. [perl #112272]

Perl no longer mangles the environment block, e.g. when launching a
new sub-process, when the environment contains non-ASCII characters.
Known problems still remain, however, when the environment contains
characters outside of the current ANSI codepage (e.g. see the item
about Unicode in %ENV in
< http://perl5.git.perl.org/perl.git/blob/HEAD:/Porting/todo.pod>;).
[perl #113536]

VMS All C header files from the top-level directory of the distribution
are now installed on VMS, providing consistency with a long-standing
practice on other platforms. Previously only a subset were
installed, which broke non-core extension builds for extensions that
depended on the missing include files.

Internal Changes
* The "study" function was made a no-op in 5.16. It was simply
disabled via a "return" statement; the code was left in place. Now
the code supporting what "study" used to do has been removed.

* Under threaded perls, there is no longer a separate PV allocated for
every COP to store its package name ("cop->stashpv"). Instead, there
is an offset ("cop->stashoff") into the new "PL_stashpad" array,
which holds stash pointers.

* In the pluggable regex API, the "regexp_engine" struct has acquired
a new field "op_comp", which is currently just for perl's internal
use, and should be initialised to NULL by other regex plugin
modules.

* A new function "alloccoptash" has been added to the API, but is
considered experimental. See perlapi.

Selected Bug Fixes
* The implementation of code blocks in regular expressions, such as
"(?{})" and "(??{})", has been heavily reworked to eliminate a whole
slew of bugs. The main user-visible changes are:

* Code blocks within patterns are now parsed in the same pass as
the surrounding code; in particular it is no longer necessary to
have balanced braces: this now works:

/(?{ $x='{' })/

This means that this error message is longer generated:

Sequence (?{...}) not terminated or not {}-balanced in regex

but a new error may be seen:

Sequence (?{...}) not terminated with ')'

In addition, literal code blocks within run-time patterns are
only compiled once, at perl compile-time:

for my $p (...) {
# this 'FOO' block of code is compiled once,
# at the same time as the surrounding 'for' loop
/$p{(?{FOO;})/;
}

* Lexical variables are now sane as regards scope, recursion and
closure behavior. In particular, "/A(?{B})C/" behaves (from a
closure viewpoint) exactly like "/A/ && do { B } && /C/", while
"qr/A(?{B})C/" is like "sub {/A/ && do { B } && /C/}". So this
code now works how you might expect, creating three regexes that
match 0, 1, and 2:

for my $i (0..2) {
push @r, qr/^(??{$i})$/;
}
"1" =~ $r[1]; # matches

* The "use re 'eval'" pragma is now only required for code blocks
defined at runtime; in particular in the following, the text of
the $r pattern is still interpolated into the new pattern and
recompiled, but the individual compiled code-blocks within $r
are reused rather than being recompiled, and "use re 'eval'"
isn't needed any more:

my $r = qr/abc(?{....})def/;
/xyz$r/;

* Flow control operators no longer crash. Each code block runs in
a new dynamic scope, so "next" etc. will not see any enclosing
loops and "caller" will not see any calling subroutines.
"return" returns a value from the code block, not from any
enclosing subroutine.

* Perl normally caches the compilation of run-time patterns, and
doesn't recompile if the pattern hasn't changed, but this is now
disabled if required for the correct behavior of closures. For
example:

my $code = '(??{$x})';
for my $x (1..3) {
# recompile to see fresh value of $x each time
$x =~ /$code/;
}

* The "/msix" and "(?msix)" etc. flags are now propagated into the
return value from "(??{})"; this now works:

"AB" =~ /a(??{'b'})/i;

* Warnings and errors will appear to come from the surrounding
code (or for run-time code blocks, from an eval) rather than
from an "re_eval":

use re 'eval'; $c = '(?{ warn "foo" })'; /$c/;
/(?{ warn "foo" })/;

formerly gave:

foo at (re_eval 1) line 1.
foo at (re_eval 2) line 1.

and now gives:

foo at (eval 1) line 1.
foo at /some/prog line 2.

* Perl now works as well as can be expected on all releases of Unicode
so far. In v5.16, it worked on Unicodes 6.0 and 6.1, but there were
various bugs for earlier releases; the older the release the more
problems.

* "vec" no longer produces "uninitialized" warnings in lvalue context
[perl #9423].

* An optimization involving fixed strings in regular expressions could
cause a severe performance penalty in edge cases. This has been
fixed [perl #76546].

* In certain cases, including empty subpatterns within a regular
expression (such as "(?:)" or "(?:|)") could disable some
optimizations. This has been fixed.

* The "Can't find an opnumber" message that "prototype" produces when
passed a string like "CORE::nonexistent_keyword" now passes UTF-8
and embedded NULs through unchanged [perl #97478].

* "prototype" now treats magical variables like $1 the same way as
non-magical variables when checking for the CORE:: prefix, instead
of treating them as subroutine names.

* Under threaded perls, a runtime code block in a regular expression
could corrupt the package name stored in the op tree, resulting in
bad reads in "caller", and possibly crashes [perl #113060].

* Referencing a closure prototype ("\&{$_[1]}" in an attribute handler
for a closure) no longer results in a copy of the subroutine (or
assertion failures on debugging builds).

* "eval '__PACKAGE__'" now returns the right answer on threaded builds
if the current package has been assigned over (as in "*ThisPackage::
= *ThatPackage::") [perl #78742].

* If a package is deleted by code that it calls, it is possible for
"caller" to see a stack frame belonging to that deleted package.
"caller" could crash if the stash's memory address was reused for a
scalar and a substitution was performed on the same scalar [perl
#113486].

* "UNIVERSAL::can" no longer treats its first argument differently
depending on whether it is a string or number internally.

* "open" with "<&" for the mode checks to see whether the third
argument is a number, in determining whether to treat it as a file
descriptor or a handle name. Magical variables like $1 were always
failing the numeric check and being treated as handle names.

* "warn"'s handling of magical variables ($1, ties) has undergone
several fixes. "FETCH" is only called once now on a tied argument or
a tied $@ [perl #97480]. Tied variables returning objects that
stringify as "" are no longer ignored. A tied $@ that happened to
return a reference the *previous* time is was used is no longer
ignored.

* "warn """ now treats $@ with a number in it the same way, regardless
of whether it happened via "$@=3" or "$@="3"". It used to ignore the
former. Now it appends "\t...caught", as it has always done with
"$@="3"".

* Numeric operators on magical variables (e.g., "$1 + 1") used to use
floating point operations even where integer operations were more
appropriate, resulting in loss of accuracy on 64-bit platforms [perl
#109542].

* Unary negation no longer treats a string as a number if the string
happened to be used as a number at some point. So, if $x contains
the string "dogs", "-$x" returns "-dogs" even if "$y=0+$x" has
happened at some point.

* In Perl 5.14, "-'-10'" was fixed to return "10", not "+10". But
magical variables ($1, ties) were not fixed till now [perl #57706].

* Unary negation now treats strings consistently, regardless of the
internal "UTF8" flag.

* A regression introduced in Perl v5.16.0 involving
"tr/*SEARCHLIST*/*REPLACEMENTLIST*/" has been fixed. Only the first
instance is supposed to be meaningful if a character appears more
than once in "*SEARCHLIST*". Under some circumstances, the final
instance was overriding all earlier ones. [perl #113584]

* Regular expressions like "qr/\87/" previously silently inserted a
NUL character, thus matching as if it had been written "qr/\00087/".
Now it matches as if it had been written as "qr/87/", with a message
that the sequence "\8" is unrecognized.

* "__SUB__" now works in special blocks ("BEGIN", "END", etc.).

* Thread creation on Windows could theoretically result in a crash if
done inside a "BEGIN" block. It still does not work properly, but it
no longer crashes [perl #111610].

* "\&{''}" (with the empty string) now autovivifies a stub like any
other sub name, and no longer produces the "Unable to create sub"
error [perl #94476].

Known Problems
* On VMS, Module::Build still fails its test suite.

* On Win32, several tests fail intermittently, and may hang unless
STDERR is redirected.

Acknowledgements
Perl 5.17.1 represents approximately 4 weeks of development since Perl
5.17.0 and contains approximately 37,000 lines of changes across 710
files from 35 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 5.17.1:

?, Andy Dougherty, Aristotle Pagaltzis, Breno G. de Oliveira, Brian
Fraser, Chris 'BinGOs' Williams, Craig A. Berry, David Mitchell, Dominic
Hargreaves, Evan Miller, Father Chrysostomos, Florian Ragwitz, H.Merijn
Brand, Herbert Breunung, Hugo van der Sanden, Jesse Luehrs, Karl
Williamson, Karthik Rajagopalan, Lukas Mai, Martin Hasch, Michael
Schroeder, Nicholas Clark, Paul Johnson, Reini Urban, Renee Baecker,
Rhesa Rozendaal, Ricardo Signes, Shlomi Fish, Steve Hay, Steve Peters,
Sullivan Beck, Tony Cook, Volker Schatz, Yves Orton, Zefram.

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 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@xxxxx 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@xxxxx 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.

----
こがよういちろう


投稿者 xml-rpc : 2012年6月25日 09:21
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