PERL585DELTA(1)        Perl Programmers Reference Guide        PERL585DELTA(1)


       perl585delta - what is new for perl v5.8.5


       This document describes differences between the 5.8.4 release and the
       5.8.5 release.

Incompatible Changes

       There are no changes incompatible with 5.8.4.

Core Enhancements

       Perl’s regular expression engine now contains support for matching on
       the intersection of two Unicode character classes. You can also now
       refer to user-defined character classes from within other user defined
       character classes.

Modules and Pragmata

       FIXME test 12 in ext/List/Util/t/lln.t at RC1 time

       ·   Carp improved to work nicely with Safe. Carp’s message reporting
           should now be anomaly free - it will always print out line number

       ·   CGI upgraded to version 3.05

       ·   charnames now avoids clobbering $_

       ·   Digest upgraded to version 1.08

       ·   Encode upgraded to version 2.01

       ·   FileCache upgraded to version 1.04

       ·   libnet upgraded to version 1.19

       ·   Pod::Parser upgraded to version 1.28

       ·   Pod::Perldoc upgraded to version 3.13

       ·   Pod::LaTeX upgraded to version 0.57

       ·   Safe now works properly with Carp

       ·   Scalar-List-Utils upgraded to version 1.14

       ·   Shell’s documentation has been re-written, and its historical par-
           tial auto-quoting of command arguments can now be disabled.

       ·   Test upgraded to version 1.25

       ·   Test::Harness upgraded to version 2.42

       ·   Time::Local upgraded to version 1.10

       ·   Unicode::Collate upgraded to version 0.40

       ·   Unicode::Normalize upgraded to version 0.30

Utility Changes

       Perls debugger

       The debugger can now emulate stepping backwards, by restarting and
       rerunning all bar the last command from a saved command history.


       h2ph is now able to understand a very limited set of C inline functions
       -- basically, the inline functions that look like CPP macros. This has
       been introduced to deal with some of the headers of the newest versions
       of the glibc. The standard warning still applies; to quote h2ph’s docu-
       mentation, you may need to dicker with the files produced.

Installation and Configuration Improvements

       Perl 5.8.5 should build cleanly from source on LynxOS.

Selected Bug Fixes

       ·   The in-place sort optimisation introduced in 5.8.4 had a bug. For
           example, in code such as

               @a = sort ($b, @a)

           the result would omit the value $b. This is now fixed.

       ·   The optimisation for unnecessary assignments introduced in 5.8.4
           could give spurious warnings. This has been fixed.

       ·   Perl should now correctly detect and read BOM-marked and (BOMless)
           UTF-16 scripts of either endianness.

       ·   Creating a new thread when weak references exist was buggy, and
           would often cause warnings at interpreter destruction time. The
           known bug is now fixed.

       ·   Several obscure bugs involving manipulating Unicode strings with
           "substr" have been fixed.

       ·   Previously if Perl’s file globbing function encountered a directory
           that it did not have permission to open it would return immedi-
           ately, leading to unexpected truncation of the list of results.
           This has been fixed, to be consistent with Unix shells’ globbing

       ·   Thread creation time could vary wildly between identical runs. This
           was caused by a poor hashing algorithm in the thread cloning rou-
           tines, which has now been fixed.

       ·   The internals of the ithreads implementation were not checking if
           OS-level thread creation had failed. threads->create() now returns
           "undef" in if thread creation fails instead of crashing perl.

New or Changed Diagnostics

       ·   Perl -V has several improvements

           ·   correctly outputs local patch names that contain embedded code
               snippets or other characters that used to confuse it.

           ·   arguments to -V that look like regexps will give multiple lines
               of output.

           ·   a trailing colon suppresses the linefeed and ’;’  terminator,
               allowing embedding of queries into shell commands.

           ·   a leading colon removes the ’name=’ part of the response,
               allowing mapping to any name.

       ·   When perl fails to find the specified script, it now outputs a sec-
           ond line suggesting that the user use the "-S" flag:

               $ perl5.8.5
               Can’t open perl script "": No such file or directory.
               Use -S to search $PATH for it.

Changed Internals

       The Unicode character class files used by the regular expression engine
       are now built at build time from the supplied Unicode consortium data
       files, instead of being shipped prebuilt. This makes the compressed
       Perl source tarball about 200K smaller. A side effect is that the lay-
       out of files inside lib/unicore has changed.

Known Problems

       The regression test t/uni/class.t is now performing considerably more
       tests, and can take several minutes to run even on a fast machine.

Platform Specific Problems

       This release is known not to build on Windows 95.

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  There may also be information at, the Perl Home Page.

       If you believe you have an unreported bug, please run the perlbug pro-
       gram 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 to be analysed 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 v5.8.6                       2004-11-05                   PERL585DELTA(1)

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