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
There are no changes incompatible with 5.8.4.
Perls 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
Modules and Pragmata
Carp improved to work nicely with Safe. Carps message reporting
should now be anomaly free - it will always print out line number
CGI upgraded to version 3.05
charnames now avoids clobbering $_
Digest upgraded to version 1.08
Encode upgraded to version 2.01
FileCache upgraded to version 1.04
libnet upgraded to version 1.19
Pod::Parser upgraded to version 1.28
Pod::Perldoc upgraded to version 3.13
Pod::LaTeX upgraded to version 0.57
Safe now works properly with Carp
Scalar-List-Utils upgraded to version 1.14
Shells documentation has been re-written, and its historical par
tial auto-quoting of command arguments can now be disabled.
Test upgraded to version 1.25
Test::Harness upgraded to version 2.42
Time::Local upgraded to version 1.10
Unicode::Collate upgraded to version 0.40
Unicode::Normalize upgraded to version 0.30
The debugger can now emulate stepping backwards, by restarting and
rerunning all bar the last command from a saved command history.
h2ph is now able to understand a very limited set of C inline functions
-- basically, the inline functions that look like CPP macros. This has
been introduced to deal with some of the headers of the newest versions
of the glibc. The standard warning still applies; to quote h2phs docu
mentation, you may need to dicker with the files produced.
Installation and Configuration Improvements
Perl 5.8.5 should build cleanly from source on LynxOS.
Selected Bug Fixes
The in-place sort optimisation introduced in 5.8.4 had a bug. For
example, in code such as
@a = sort ($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 Perls 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
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 missing.pl
Cant open perl script "missing.pl": No such file or directory.
Use -S to search $PATH for it.
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.
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.
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 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 firstname.lastname@example.org 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 v5.8.8 2008-04-25 PERL585DELTA(1)