MirOS Manual: perl583delta(1)


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

NAME

     perl583delta - what is new for perl v5.8.3

DESCRIPTION

     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 caveats.

Modules and Pragmata

     CGI
     Cwd
     Digest
     Digest::MD5
     Encode
     File::Spec
     FindBin
         A function "again" is provided to resolve problems where
         modules in different directories wish to use FindBin.

     List::Util
         You can now weaken references to read only values.

     Math::BigInt
     PodParser
     Pod::Perldoc
     POSIX
     Unicode::Collate

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     Unicode::Normalize
     Test::Harness
     threads::shared
         "cond_wait" has a new two argument form.
         "cond_timedwait" has been added.

Utility Changes

     "find2perl" now assumes "-print" as a default action. Previ-
     ously, it needed to be specified 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 imple-
     menting $^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 accidentally 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 perldiag.

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Changed Internals

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

     "hv_clear_placeholders" is now part of the perl API

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

     <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 con-
     figuration 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 thread-
     ing implementations. RedHat users should see
     https://rhn.redhat.com/errata/RHBA-2003-136.html and con-
     sider upgrading their glibc.

Known Problems

     Detached threads aren't supported on Windows yet, as they
     may lead to memory access violation problems.

     There is a known race condition opening scripts in "suid-
     perl". "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. Simi-
     larly 5.8.5's freeze will be at the end of June, with
     release by mid July.

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Obituary

     Iain 'Spoon' Truskett, Perl hacker, author of perlreref and
     contributor to CPAN, died suddenly 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 news-
     group 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 analysed by the Perl porting team.
     You can browse and search the Perl 5 bugs at
     http://bugs.perl.org/

SEE ALSO

     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.

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