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X11R7.4 - man page for perl583delta (x11r4 section 1)

PERL583DELTA(1) 		 Perl Programmers Reference Guide		  PERL583DELTA(1)

       perl583delta - what is new for perl v5.8.3

       This document describes differences between the 5.8.2 release and the 5.8.3 release.

       If you are upgrading from an earlier release such as 5.6.1, first read the perl58delta,
       which describes differences between 5.6.0 and 5.8.0, and the perl581delta and
       perl582delta, which describe differences between 5.8.0, 5.8.1 and 5.8.2

Incompatible Changes
       There are no changes incompatible with 5.8.2.

Core Enhancements
       A "SCALAR" method is now available for tied hashes. This is called when a tied hash is
       used in scalar context, such as

	   if (%tied_hash) {

       The old behaviour was that %tied_hash would return whatever would have been returned for
       that hash before the hash was tied (so usually 0). The new behaviour in the absence of a
       SCALAR method is to return TRUE if in the middle of an "each" iteration, and otherwise
       call FIRSTKEY to check if the hash is empty (making sure that a subsequent "each" will
       also begin by calling FIRSTKEY). Please see "SCALAR" in perltie for the full details and

Modules and Pragmata
	   A function "again" is provided to resolve problems where modules in different directo-
	   ries wish to use FindBin.

	   You can now weaken references to read only values.

	   "cond_wait" has a new two argument form. "cond_timedwait" has been added.

Utility Changes
       "find2perl" now assumes "-print" as a default action. Previously, it needed to be speci-
       fied explicitly.

       A new utility, "prove", makes it easy to run an individual regression test at the command
       line. "prove" is part of Test::Harness, which users of earlier Perl versions can install
       from CPAN.

New Documentation
       The documentation has been revised in places to produce more standard manpages.

       The documentation for the special code blocks (BEGIN, CHECK, INIT, END) has been improved.

Installation and Configuration Improvements
       Perl now builds on OpenVMS I64

Selected Bug Fixes
       Using substr() on a UTF8 string could cause subsequent accesses on that string to return
       garbage. This was due to incorrect UTF8 offsets being cached, and is now fixed.

       join() could return garbage when the same join() statement was used to process 8 bit data
       having earlier processed UTF8 data, due to the flags on that statement's temporary
       workspace not being reset correctly. This is now fixed.

       "$a .. $b" will now work as expected when either $a or $b is "undef"

       Using Unicode keys with tied hashes should now work correctly.

       Reading $^E now preserves $!. Previously, the C code implementing $^E did not preserve
       "errno", so reading $^E could cause "errno" and therefore $! to change unexpectedly.

       Reentrant functions will (once more) work with C++. 5.8.2 introduced a bugfix which acci-
       dentally broke the compilation of Perl extensions written in C++

New or Changed Diagnostics
       The fatal error "DESTROY created new reference to dead object" is now documented in perl-

Changed Internals
       The hash code has been refactored to reduce source duplication. The external interface is
       unchanged, and aside from the bug fixes described above, there should be no change in be-

       "hv_clear_placeholders" is now part of the perl API

       Some C macros have been tidied. In particular macros which create temporary local vari-
       ables now name these variables more defensively, which should avoid bugs where names

       <signal.h> is now always included.

Configuration and Building
       "Configure" now invokes callbacks regardless of the value of the variable they are called
       for. Previously callbacks were only invoked in the "case $variable $define)" branch. This
       change should only affect platform maintainers writing configuration hints files.

Platform Specific Problems
       The regression test ext/threads/shared/t/wait.t fails on early RedHat 9 and HP-UX 10.20
       due to bugs in their threading implementations.	RedHat users should see https://rhn.red-
       hat.com/errata/RHBA-2003-136.html and consider upgrading their glibc.

Known Problems
       Detached threads aren't supported on Windows yet, as they may lead to memory access viola-
       tion problems.

       There is a known race condition opening scripts in "suidperl". "suidperl" is neither built
       nor installed by default, and has been deprecated since perl 5.8.0. You are advised to
       replace use of suidperl with tools such as sudo ( http://www.courtesan.com/sudo/ )

       We have a backlog of unresolved bugs. Dealing with bugs and bug reports is unglamorous
       work; not something ideally suited to volunteer labour, but that is all that we have.

       The perl5 development team are implementing changes to help address this problem, which
       should go live in early 2004.

Future Directions
       Code freeze for the next maintenance release (5.8.4) is on March 31st 2004, with release
       expected by mid April. Similarly 5.8.5's freeze will be at the end of June, with release
       by mid July.

       Iain 'Spoon' Truskett, Perl hacker, author of perlreref and contributor to CPAN, died sud-
       denly on 29th December 2003, aged 24.  He will be missed.

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://bugs.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 an-
       alysed by the Perl porting team.  You can browse and search the Perl 5 bugs at

       The Changes file for 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 v5.8.9				    2007-11-17				  PERL583DELTA(1)

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