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PERL586DELTA(1)        Perl Programmers Reference Guide        PERL586DELTA(1)

       perl586delta - what is new for perl v5.8.6

       This document describes differences between the 5.8.5 release and the 5.8.6 release.

Incompatible Changes
       There are no changes incompatible with 5.8.5.

Core Enhancements
       The perl interpreter is now more tolerant of UTF-16-encoded scripts.

       On Win32, Perl can now use non-IFS compatible LSPs, which allows Perl to work in conjunction with firewalls
       such as McAfee Guardian. For full details see the file README.win32, particularly if you're running Win95.

Modules and Pragmata
       ?   With the "base" pragma, an intermediate class with no fields used to messes up private fields in the base
           class. This has been fixed.

       ?   Cwd upgraded to version 3.01 (as part of the new PathTools distribution)

       ?   Devel::PPPort upgraded to version 3.03

       ?   File::Spec upgraded to version 3.01 (as part of the new PathTools distribution)

       ?   Encode upgraded to version 2.08

       ?   ExtUtils::MakeMaker remains at version 6.17, as later stable releases currently available on CPAN have some
           issues with core modules on some core platforms.

       ?   I18N::LangTags upgraded to version 0.35

       ?   Math::BigInt upgraded to version 1.73

       ?   Math::BigRat upgraded to version 0.13

       ?   MIME::Base64 upgraded to version 3.05

       ?   POSIX::sigprocmask function can now retrieve the current signal mask without also setting it.

       ?   Time::HiRes upgraded to version 1.65

Utility Changes
       Perl has a new -dt command-line flag, which enables threads support in the debugger.

Performance Enhancements
       "reverse sort ..." is now optimized to sort in reverse, avoiding the generation of a temporary intermediate

       "for (reverse @foo)" now iterates in reverse, avoiding the generation of a temporary reversed list.

Selected Bug Fixes
       The regexp engine is now more robust when given invalid utf8 input, as is sometimes generated by buggy XS mod-

       "foreach" on threads::shared array used to be able to crash Perl. This bug has now been fixed.

       A regexp in "STDOUT"'s destructor used to coredump, because the regexp pad was already freed. This has been

       "goto &" is now more robust - bugs in deep recursion and chained "goto &" have been fixed.

       Using "delete" on an array no longer leaks memory. A "pop" of an item from a shared array reference no longer
       causes a leak.

       "eval_sv()" failing a taint test could corrupt the stack - this has been fixed.

       On platforms with 64 bit pointers numeric comparison operators used to erroneously compare the addresses of
       references that are overloaded, rather than using the overloaded values. This has been fixed.

       "read" into a UTF8-encoded buffer with an offset off the end of the buffer no longer mis-calculates buffer

       Although Perl has promised since version 5.8 that "sort()" would be stable, the two cases "sort {$b cmp $a}"
       and "sort {$b <=> $a}" could produce non-stable sorts.   This is corrected in perl5.8.6.

       Localising $^D no longer generates a diagnostic message about valid -D flags.

New or Changed Diagnostics
       For -t and -T,
          Too late for "-T" option has been changed to the more informative
          "-T" is on the #! line, it must also be used on the command line

Changed Internals
       From now on all applications embedding perl will behave as if perl were compiled with -DPERL_USE_SAFE_PUTENV.
       See "Environment access" in the INSTALL file for details.

       Most "C" source files now have comments at the top explaining their purpose, which should help anyone wishing
       to get an overview of the implementation.

New Tests
       There are significantly more tests for the "B" suite of modules.

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 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 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                       2006-01-07                   PERL586DELTA(1)