PERL5213DELTA(1) Perl Programmers Reference Guide PERL5213DELTA(1)NAMEperl5213delta - what is new for perl v5.21.3
DESCRIPTION
This document describes differences between the 5.21.2 release and the
5.21.3 release.
If you are upgrading from an earlier release such as 5.21.1, first read
perl5212delta, which describes differences between 5.21.1 and 5.21.2.
Core Enhancements
"defined(@array = LIST)" is no longer fatal
In 5.21.1, "defined(@array)" was made fatal. This has been relaxed to
not die if the argument is assigning to an array.
Floating point parsing has been improved
Parsing and printing of floating point values has been improved.
As a completely new feature, hexadecimal floating point literals (like
0x1.23p-4) are now supported, and they can be output with "printf %a".
Security
The Safe module could allow outside packages to be replaced
Critical bugfix: outside packages could be replaced. Safe has been
patched to 2.38 to address this.
Incompatible Changes
"use UNIVERSAL '...'" is now a fatal error
Importing functions from "UNIVERSAL" has been deprecated since v5.12,
and is now a fatal error. "use UNIVERSAL" without any arguments is
still allowed.
Modules and Pragmata
Updated Modules and Pragmata
· B::Debug has been upgraded from version 1.19 to 1.21.
· Config::Perl::V has been upgraded from version 0.20 to 0.22.
· CPAN::Meta has been upgraded from version 2.141520 to 2.142060.
· CPAN::Meta::Requirements has been upgraded from version 2.125 to
2.126.
· ExtUtils::CBuilder was moved from dist to cpan.
· ExtUtils::CBuilder has been upgraded from version 0.280216 to
0.280217.
· ExtUtils::Install was moved from dist to cpan.
· ExtUtils::Manifest has been upgraded from version 1.64 to 1.65. It
was also moved from dist to cpan.
· HTTP::Tiny has been upgraded from version 0.043 to 0.047.
· IPC::Open3 has been upgraded from version 1.17 to 1.18.
· Module::CoreList has been upgraded from version 5.021002 to
5.021003.
· Opcode has been upgraded from version 1.27 to 1.28.
· perl5db.pl has been upgraded from version 1.45 to 1.46.
· perlfaq has been upgraded from version 5.0150044 to 5.0150045.
· POSIX has been upgraded from version 1.41 to 1.42.
· Safe has been upgraded from version 2.37 to 2.38.
· Socket has been upgraded from version 2.014 to 2.015.
· Sys::Hostname has been upgraded from version 1.18 to 1.19
· UNIVERSAL has been upgraded from version 1.11 to 1.12.
Documentation
Changes to Existing Documentation
perlexperiment
· Added reference to feature.
perlguts
· Details on C level symbols and libperl.t added.
perlhacktips
· Recommended replacements for tmpfile, atoi, strtol, and strtoul
added.
perlop
· ASCII v. EBCDIC clarifications added.
perlsec
· Comments added on algorithmic complexity and tied hashes.
perlvms
· Updated documentation on environment and shell interaction in VMS.
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
· Hexadecimal float: internal error
(F) Something went horribly bad in hexadecimal float handling.
· Hexadecimal float: unsupported long double format
(F) You have configured Perl to use long doubles but the internals
of the long double format are unknown, therefore the hexadecimal
float output is impossible.
New Warnings
· Hexadecimal float: exponent overflow
(W overflow) The hexadecimal floating point has larger exponent
than the floating point supports.
· Hexadecimal float: exponent underflow
(W overflow) The hexadecimal floating point has smaller exponent
than the floating point supports.
· Hexadecimal float: mantissa overflow
(W overflow) The hexadecimal floating point literal had more bits
in the mantissa (the part between the 0x and the exponent, also
known as the fraction or the significand) than the floating point
supports.
· Hexadecimal float: precision loss
(W overflow) The hexadecimal floating point had internally more
digits than could be output. This can be caused by unsupported
long double formats, or by 64-bit integers not being available
(needed to retrieve the digits under some configurations).
Changes to Existing Diagnostics
· "require" with no argument or undef used to warn about a Null
filename; now it dies with "Missing or undefined argument to
require".
Configuration and Compilation
· MurmurHash64A and MurmurHash64B can now be configured as the
internal hash function.
Platform Support
Platform-Specific Notes
Android
Build support has been improved for cross-compiling in general and
for Android in particular.
Solaris
"c99" options have been cleaned up, hints look for "solstudio" as
well as "SUNWspro", and support for native "setenv" has been added.
VMS "finite", "finitel", and "isfinite" detection has been added to
"configure.com", environment handling has had some minor changes,
and a fix for legacy feature checking status.
Windows
%I64d is now being used instead of %lld for MinGW.
Internal Changes
· Added "sync_locale" in perlapi. Changing the program's locale
should be avoided by XS code. Nevertheless, certain non-Perl
libraries called from XS, such as "Gtk" do so. When this happens,
Perl needs to be told that the locale has changed. Use this
function to do so, before returning to Perl.
· Added "grok_atou" in perlapi as a safer replacement for atoi and
strtol.
Selected Bug Fixes
· Failing to compile "use Foo" in an eval could leave a spurious
"BEGIN" subroutine definition, which would produce a "Subroutine
BEGIN redefined" warning on the next use of "use", or other "BEGIN"
block. [perl #122107]
· "method { BLOCK } ARGS" syntax now correctly parses the arguments
if they begin with an opening brace. [perl #46947]
· External libraries and Perl may have different ideas of what the
locale is. This is problematic when parsing version strings if the
locale's numeric separator has been changed. Version parsing has
been patched to ensure it handles the locales correctly. [perl
#121930]
· A bug has been fixed where zero-length assertions and code blocks
inside of a regex could cause "pos" to see an incorrect value.
[perl #122460]
Acknowledgements
Perl 5.21.3 represents approximately 4 weeks of development since Perl
5.21.2 and contains approximately 21,000 lines of changes across 250
files from 25 authors.
Excluding auto-generated files, documentation and release tools, there
were approximately 18,000 lines of changes to 160 .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 5.21.3:
Aaron Crane, Abigail, Alberto Simo~es, Andy Dougherty, Brian Fraser,
Chad Granum, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari
Mannsaaker, Daniel Dragan, David Mitchell, Father Chrysostomos,
H.Merijn Brand, James E Keenan, Jan Dubois, Jarkko Hietaniemi, Karen
Etheridge, Karl Williamson, Lukas Mai, Peter Martini, Rafael Garcia-
Suarez, syber, Tony Cook, Vladimir Marek, Yves Orton.
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 PERL5213DELTA(1)
