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X11R7.4 - man page for perl584delta (x11r4 section 1)

PERL584DELTA(1) 		 Perl Programmers Reference Guide		  PERL584DELTA(1)

       perl584delta - what is new for perl v5.8.4

       This document describes differences between the 5.8.3 release and the 5.8.4 release.

Incompatible Changes
       Many minor bugs have been fixed. Scripts which happen to rely on previously erroneous be-
       haviour will consider these fixes as incompatible changes :-) You are advised to perform
       sufficient acceptance testing on this release to satisfy yourself that this does not
       affect you, before putting this release into production.

       The diagnostic output of Carp has been changed slightly, to add a space after the comma
       between arguments. This makes it much easier for tools such as web browsers to wrap it,
       but might confuse any automatic tools which perform detailed parsing of Carp output.

       The internal dump output has been improved, so that non-printable characters such as new-
       line and backspace are output in "\x" notation, rather than octal. This might just confuse
       non-robust tools which parse the output of modules such as Devel::Peek.

Core Enhancements
       Malloc wrapping

       Perl can now be built to detect attempts to assign pathologically large chunks of memory.
       Previously such assignments would suffer from integer wrap-around during size calculations
       causing a misallocation, which would crash perl, and could theoretically be used for
       "stack smashing" attacks.  The wrapping defaults to enabled on platforms where we know it
       works (most AIX configurations, BSDi, Darwin, DEC OSF/1, FreeBSD, HP/UX, GNU Linux, Open-
       BSD, Solaris, VMS and most Win32 compilers) and defaults to disabled on other platforms.

       Unicode Character Database 4.0.1

       The copy of the Unicode Character Database included in Perl 5.8 has been updated to 4.0.1
       from 4.0.0.

       suidperl less insecure

       Paul Szabo has analysed and patched "suidperl" to remove existing known insecurities. Cur-
       rently there are no known holes in "suidperl", but previous experience shows that we can-
       not be confident that these were the last. You may no longer invoke the set uid perl
       directly, so to preserve backwards compatibility with scripts that invoke #!/usr/bin/suid-
       perl the only set uid binary is now "sperl5.8."n ("sperl5.8.4" for this release). "suid-
       perl" is installed as a hard link to "perl"; both "suidperl" and "perl" will invoke
       "sperl5.8.4" automatically the set uid binary, so this change should be completely trans-

       For new projects the core perl team would strongly recommend that you use dedicated, sin-
       gle purpose security tools such as "sudo" in preference to "suidperl".


       In addition to bug fixes, "format"'s features have been enhanced. See perlform

Modules and Pragmata
       The (mis)use of "/tmp" in core modules and documentation has been tidied up.  Some modules
       available both within the perl core and independently from CPAN ("dual-life modules") have
       not yet had these changes applied; the changes will be integrated into future stable perl
       releases as the modules are updated on CPAN.

       Updated modules

	   There is experimental support for Linux abstract Unix domain sockets.

	   Synced with its CPAN version 2.10

	   "syslog()" can now use numeric constants for facility names and priorities, in addi-
	   tion to strings.

	   Win32.pm/Win32.xs has moved from the libwin32 module to core Perl

	   Detached threads are now also supported on Windows.


Performance Enhancements
       o   Accelerated Unicode case mappings ("/i", "lc", "uc", etc).

       o   In place sort optimised (eg "@a = sort @a")

       o   Unnecessary assignment optimised away in

	     my $s = undef;
	     my @a = ();
	     my %h = ();

       o   Optimised "map" in scalar context

Utility Changes
       The Perl debugger (lib/perl5db.pl) can now save all debugger commands for sourcing later,
       and can display the parent inheritance tree of a given class.

Installation and Configuration Improvements
       The build process on both VMS and Windows has had several minor improvements made. On Win-
       dows Borland's C compiler can now compile perl with PerlIO and/or USE_LARGE_FILES enabled.

       "perl.exe" on Windows now has a "Camel" logo icon. The use of a camel with the topic of
       Perl is a trademark of O'Reilly and Associates Inc., and is used with their permission (ie
       distribution of the source, compiling a Windows executable from it, and using that exe-
       cutable locally). Use of the supplied camel for anything other than a perl executable's
       icon is specifically not covered, and anyone wishing to redistribute perl binaries with
       the icon should check directly with O'Reilly beforehand.

       Perl should build cleanly on Stratus VOS once more.

Selected Bug Fixes
       More utf8 bugs fixed, notably in how "chomp", "chop", "send", and "syswrite" and interact
       with utf8 data. Concatenation now works correctly when "use bytes;" is in scope.

       Pragmata are now correctly propagated into (?{...}) constructions in regexps.  Code such

	  my $x = qr{ ... (??{ $x }) ... };

       will now (correctly) fail under use strict. (As the inner $x is and has always referred to

       The "const in void context" warning has been suppressed for a constant in an optimised-
       away boolean expression such as "5 || print;"

       "perl -i" could "fchmod(stdin)" by mistake. This is serious if stdin is attached to a ter-
       minal, and perl is running as root. Now fixed.

New or Changed Diagnostics
       "Carp" and the internal diagnostic routines used by "Devel::Peek" have been made clearer,
       as described in "Incompatible Changes"

Changed Internals
       Some bugs have been fixed in the hash internals. Restricted hashes and their place holders
       are now allocated and deleted at slightly different times, but this should not be visible
       to user code.

Future Directions
       Code freeze for the next maintenance release (5.8.5) will be on 30th June 2004, with
       release by mid July.

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 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				  PERL584DELTA(1)

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