2012年5月28日

[installer 3229] perl-5.17.0

perl-5.17.0 出ています。

☆ perl-5.17.0
http://www.perl.com/CPAN/src/
http://www.cpan.org/src/5.0/perl-5.17.0.tar.gz

NAME
perldelta - what is new for perl v5.17.0


DESCRIPTION
This document describes differences between the 5.16.0 release and the
5.17.0 release.

If you are upgrading from an earlier release such as 5.16.0, first read
perl5160delta, which describes differences between 5.14.0 and 5.16.0.

Incompatible Changes
qw(...) can no longer be used as parentheses
"qw" lists used to fool the parser into thinking they were always
surrounded by parentheses. This permitted some surprising constructions
such as "foreach $x qw(a b c) {...}", which should really be written
"foreach $x (qw(a b c)) {...}". These would sometimes get the lexer into
the wrong state, so they didn't fully work, and the similar "foreach
qw(a b c) {...}" that one might expect to be permitted never worked at
all.

This side effect of "qw" has now been abolished. It has been deprecated
since Perl 5.13.11. It is now necessary to use real parentheses
everywhere that the grammar calls for them.

"\s" in regular expressions now matches a Vertical Tab (experimental)
This is an experiment early in the development cycle to see what
repercussions arise from this change. It may well be that we decide to
require a "use feature" to activate this behavior. Because of the
experimental nature of this, which may be reversed, the documentation
has not been changed to reflect it.

Deprecations
Unescaped braces in regexps
Literal unescaped "{" in regular expressions is now deprecated. Every
brace character should be either escaped (by a preceding backslash) or
part of a construct where it's a metacharacter. This catches likely
typos such as "/f{,3}/". It will also allow braces to be used in the
future to delimit parameters to metacharacters that currently take no
parameters.

Performance Enhancements
* Filetest ops manage the stack in a fractionally more efficient
manner.

* Globs used in a numeric context are now numerified directly in most
cases, rather than being numerified via stringification.

Modules and Pragmata
Updated Modules and Pragmata
* B has been upgraded from version 1.34 to 1.35.

The "stashlen" method of COPs has been added. This provides access
to an internal field added in perl 5.16 under threaded builds [perl
#113034].

* ExtUtils::ParseXS has been upgraded from version 3.16 to 3.17.

The generated C code now avoids unnecessarily incrementing
"PL_amagic_generation" on Perl versions where it's done
automatically (or on current Perl where the variable no longer
exists).

* File::DosGlob has been upgraded from version 1.06 to 1.07.

Small documentation and comment fixes.

* File::Find has been upgraded from version 1.20 to 1.21.

Individual files may now appear in list of directories to be
searched [perl #59750].

* File::stat has been upgraded from version 1.05 to 1.06.

"File::stat" ignores the filetest pragma, and warns when used in
combination therewith. But it was not warning for "-r". This has
been fixed [perl #111640].

"-p" now works, and does not return false for pipes [perl #111638].

* Hash::Util has been upgraded from version 0.11 to 0.12.

"hash_unlocked" and "hashref_unlocked" now returns true if the hash
is unlocked, instead of always returning false [perl #112126].

"hash_unlocked", "hashref_unlocked", "lock_hash_recurse" and
"unlock_hash_recurse" are now exportable [perl #112126].

Two new functions, "hash_locked" and "hashref_locked", have been
added. Oddly enough, these two functions were already exported, even
though they did not exist [perl #112126].

* Module::CoreList has been upgraded from version 2.66 to 2.67.

* overload has been upgraded from version 1.18 to 1.19.

"no overload" now warns for invalid arguments, just like "use
overload".

* Pod::Functions has been upgraded from version 1.05 to 1.06.

Typo fix in generated documentation.

* Storable has been upgraded from version 2.34 to 2.35.

Modifying $_[0] within "STORABLE_freeze" no longer results in
crashes [perl #112358].

An object whose class implements "STORABLE_attach" is now thawed
only once when there are multiple references to it in the structure
being thawed [perl #111918].

* utf8 has been upgraded from version 1.09 to 1.10.

Some documentation has been clarified.

Removed Modules and Pragmata
* Version::Requirements has been removed from the core distribution.
It is available under a different name: CPAN::Meta::Requirements.

Documentation
Changes to Existing Documentation
perldata
* Now explicitly documents the behaviour of hash initializer lists
that contain duplicate keys.

perldiag
* The explanation of symbolic references being prevented by "strict
refs" now doesn't assume that the reader knows what symbolic
references are.

perlfunc
* The return value of "pipe" is now documented.

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 Warnings
* "Unescaped left brace in regex is deprecated, passed through" is a
new deprecation warning. See "Unescaped braces in regexps".

Testing
* The test suite now has a section for tests that require very large
amounts of memory. These tests won't run by default; they can be
enabled by setting the "PERL_TEST_MEMORY" environment variable to
the number of gibibytes of memory that may be safely used.

Platform Support
Platform-Specific Notes
clang++
There is now a workaround for a compiler bug that prevented
compiling with clang++ since Perl 5.15.7 [perl #112786].

C++ When compiling the Perl core as C++ (which is only semi-supported),
the mathom functions are now compiled as "extern "C"", to ensure
proper binary compatibility. (However, binary compatibility isn't
generally guaranteed anyway in the situations where this would
matter.)

VMS It should now be possible to compile Perl as C++ on VMS.

Internal Changes
* The "CV *" typemap entry now supports "&{}" overloading and
typeglobs, just like "&{...}" [perl #96872].

* The "SVf_AMAGIC" flag to indicate overloading is now on the stash,
not the object. It is now set automatically whenever a method or
@ISA changes, so its meaning has changed, too. It now means
"potentially overloaded". When the overload table is calculated, the
flag is automatically turned off if there is no overloading, so
there should be no noticeable slowdown.

The staleness of the overload tables is now checked when overload
methods are invoked, rather than during "bless".

"A" magic is gone. The changes to the handling of the "SVf_AMAGIC"
flag eliminate the need for it.

"PL_amagic_generation" has been removed as no longer necessary. For
XS modules, it is now a macro alias to "PL_na".

The fallback overload setting is now stored in a stash entry
separate from overloadedness itself.

* The character-processing code has been cleaned up in places. The
changes should be operationally invisible.

Selected Bug Fixes
* "goto ''" now looks for an empty label, producing the "goto must
have label" error message, instead of exiting the program [perl
#111794].

* "goto "\0"" now dies with "Can't find label" instead of "goto must
have label".

* The C function "hv_store" used to result in crashes when used on
"%^H" [perl #111000].

* A call checker attached to a closure prototype via
"cv_set_call_checker" is now copied to closures cloned from it. So
"cv_set_call_checker" now works inside an attribute handler for a
closure.

* Writing to $^N used to have no effect. Now it croaks with
"Modification of a read-only value" by default, but that can be
overridden by a custom regular expression engine, as with $1 [perl
#112184].

* "undef" on a control character glob ("undef *^H") no longer emits an
erroneous warning about ambiguity [perl #112456].

* For efficiency's sake, many operators and built-in functions return
the same scalar each time. Lvalue subroutines and subroutines in the
CORE:: namespace were allowing this implementation detail to leak
through. "print &CORE::uc("a"), &CORE::uc("b")" used to print "BB".
The same thing would happen with an lvalue subroutine returning the
return value of "uc". Now the value is copied in such cases.

* "method {}" syntax with an empty block or a block returning an empty
list used to crash or use some random value left on the stack as its
invocant. Now it produces an error.

* "vec" now works with extremely large offsets (>2 GB) [perl #111730].

* Changes to overload settings now take effect immediately, as do
changes to inheritance that affect overloading. They used to take
effect only after "bless".

Objects that were created before a class had any overloading used to
remain non-overloaded even if the class gained overloading through
"use overload" or @ISA changes, and even after "bless". This has
been fixed [perl #112708].

* Classes with overloading can now inherit fallback values.

* Overloading was not respecting a fallback value of 0 if there were
overloaded objects on both sides of an assignment operator like "+="
[perl #111856].

* "pos" now croaks with hash and array arguments, instead of producing
erroneous warnings.

* "while(each %h)" now implies "while(defined($_ = each %h))", like
"readline" and "readdir".

* Subs in the CORE:: namespace no longer crash after "undef *_" when
called with no argument list (&CORE::time with no parentheses).

* Unicode 6.1 published an incorrect alias for one of the
Canonical_Combining_Class property's values (which range between 0
and 254). The alias "CCC133" should have been "CCC132". Perl now
overrides the data file furnished by Unicode to give the correct
value.

* "unpack" no longer produces the "'/' must follow a numeric type in
unpack" error when it is the data that are at fault [perl #60204].

* "join" and "@array" now call FETCH only once on a tied $" [perl
#8931].

* Some subroutine calls generated by compiling core ops affected by a
"CORE::GLOBAL" override had op checking performed twice. The
checking is always idempotent for pure Perl code, but the double
checking can matter when custom call checkers are involved.

* A race condition used to exist around fork that could cause a signal
sent to the parent to be handled by both parent and child. Signals
are now blocked briefly around fork to prevent this from happening
[perl #82580].

Acknowledgements
Perl 5.17.0 represents approximately 1 week of development since Perl
5.16.0 and contains approximately 17,000 lines of changes across 180
files from 26 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 5.16.1:

Alan Haggai Alavi, Aristotle Pagaltzis, Brian Fraser, Chris 'BinGOs'
Williams, Craig A. Berry, Dagfinn Ilmari Mannsaker, Eric Brine, Father
Chrysostomos, Igor Zaytsev, James E Keenan, Karl Williamson, Leon
Timmermans, Lukas Mai, Marcus Holland-Moritz, Matthew Horsfall, Moritz
Lenz, Rafael Garcia-Suarez, Reini Urban, Ricardo Signes, Robin Barker,
Ronald J. Kimball, Smylers, Steffen Muller, Steve Hay, Tony Cook,
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.


----
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投稿者 xml-rpc : 2012年5月28日 13:05
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