a2p
accept
access
acct
addftinfo
addr2line
adjtime
afmtodit
after
aio_cancel
aio_error
aio_read
aio_return
aio_suspend
aio_waitcomplete
aio_write
alias
aliases
alloc
anvil
append
apply
apropos
ar
array
as
asa
asn1parse
at
atq
atrm
attemptckalloc
attemptckrealloc
authlib
authtest
autopoint
awk
b64decode
b64encode
basename
batch
bc
bdes
bell
bg
bgerror
biff
big5
binary
bind
bindkey
bindtags
bindtextdomain
bio
bitmap
blowfish
bn
bootparams
bootptab
bounce
brandelf
break
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brk
bsdiff
bsdtar
bsnmpd
bspatch
bthost
btsockstat
buffer
builtin
builtins
bunzip2
button
byacc
bzcat
bzegrep
bzfgrep
bzgrep
bzip2
c2ph
c89
c99
ca
cal
calendar
canvas
cap_mkdb
case
cat
catch
catman
cc
cd
cdcontrol
chdir
checkbutton
checknr
chflags
chfn
chgrp
chio
chkey
chmod
chown
chpass
chroot
chsh
ci
ciphers
ckalloc
ckdist
ckfree
ckrealloc
cksum
cleanup
clear
clipboard
clock
clock_getres
clock_gettime
clock_settime
close
cmp
co
col
colcrt
colldef
colors
colrm
column
comm
command
compile_et
complete
compress
concat
config
connect
console
continue
core
courierlogger
couriertcpd
cp
cpan
cpio
cpp
creat
crl
crontab
crunchgen
crunchide
crypt
crypto
csh
csplit
ctags
ctm
ctm_dequeue
ctm_rmail
ctm_smail
cu
cursor
cursors
cut
cvs
date
dbiprof
dbiproxy
dc
dcgettext
dcngettext
dd
dde
default
defer
deliverquota
des
destroy
devfs
df
dgettext
dgst
dh
dhparam
dialog
diff
diff3
dig
dir
dirent
dirname
dirs
discard
disktab
dngettext
do
domainname
done
dprofpp
dsa
dsaparam
dtmfdecode
du
dup
dup2
eaccess
ec
ecdsa
echo
echotc
ecparam
ed
edit
editrc
ee
egrep
elf
elfdump
elif
else
enc
enc2xs
encoding
end
endif
endsw
engine
enigma
entry
env
envsubst
eof
eqn
err
errno
error
errstr
esac
ethers
euc
eui64
eval
event
evp
ex
exec
execve
exit
expand
export
exports
expr
extattr
extattr_delete_fd
extattr_delete_file
extattr_get_fd
extattr_get_file
extattr_set_fd
extattr_set_file
f77
false
famm
famx
fblocked
fbtab
fc
fchdir
fchflags
fchmod
fchown
fcntl
fconfigure
fcopy
fdescfs
fdformat
fdread
fdwrite
fetch
fg
fgrep
fhopen
fhstat
fhstatfs
fi
file
file2c
fileevent
filename
filetest
find
find2perl
finger
flex
flock
flush
fmt
focus
fold
font
fontedit
for
foreach
fork
format
forward
fpathconf
frame
from
fs
fstab
fstat
fstatfs
fsync
ftp
ftpchroot
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ftruncate
futimes
g711conv
gb2312
gb18030
gbk
gcc
gcore
gcov
gdb
gencat
gendsa
genrsa
gensnmptree
getconf
getdents
getdirentries
getdtablesize
getegid
geteuid
getfacl
getfh
getfsstat
getgid
getgroups
getitimer
getlogin
getopt
getopts
getpeername
getpgid
getpgrp
getpid
getppid
getpriority
getresgid
getresuid
getrlimit
getrusage
gets
getsid
getsockname
getsockopt
gettext
gettextize
gettimeofday
gettytab
getuid
glob
global
gmake
goto
gperf
gprof
grab
grep
grid
grn
grodvi
groff
groff_font
groff_out
groff_tmac
grog
grolbp
grolj4
grops
grotty
group
groups
gunzip
gzcat
gzexe
gzip
h2ph
h2xs
hash
hashstat
hd
head
help2man
hesinfo
hexdump
history
host
hostname
hosts
hosts_access
hosts_options
hpftodit
http
hup
i386_get_ioperm
i386_get_ldt
i386_set_ioperm
i386_set_ldt
i386_vm86
iconv
id
ident
idprio
if
ifnames253
ifnames259
image
imapd
incr
indent
indxbib
info
infokey
inode
install
instmodsh
interp
intro
introduction
ioctl
ipcrm
ipcs
ipf
ipftest
ipnat
ippool
ipresend
issetugid
jail
jail_attach
jobid
jobs
join
jot
kbdcontrol
kbdmap
kcon
kdestroy
kdump
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ktrace
label
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lam
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ld
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leave
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list
listbox
listen
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ln
load
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local
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lock
lockf
log
logger
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look
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lower
lp
lpq
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nex
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nice
nl
nm
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notify
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nslookup
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objcopy
objdump
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ocsp
od
onintr
open
openssl
opieaccess
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opiekey
opiekeys
opiepasswd
option
options
oqmgr
pack
package
packagens
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panedwindow
parray
passwd
paste
patch
pathchk
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pawd
pax
pbm
pcre
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pcrepartial
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then
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true
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ul
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vi
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whatis
where
whereis
which
while
who
whoami
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xargs
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xsubpp
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ypmatch
yppasswd
ypwhich
yyfix
zcat
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zegrep
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Hypertext Man Pages
perl581delta
 
PERL581DELTA(1)        Perl Programmers Reference Guide        PERL581DELTA(1)



NAME
       perl581delta - what is new for perl v5.8.1

DESCRIPTION
       This document describes differences between the 5.8.0 release and the
       5.8.1 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.

       In case you are wondering about 5.6.1, it was bug-fix-wise rather iden-
       tical to the development release 5.7.1.	Confused?  This timeline hope-
       fully helps a bit: it lists the new major releases, their maintenance
       releases, and the development releases.

		 New	 Maintenance  Development

		 5.6.0				   2000-Mar-22
				      5.7.0	   2000-Sep-02
			 5.6.1			   2001-Apr-08
				      5.7.1	   2001-Apr-09
				      5.7.2	   2001-Jul-13
				      5.7.3	   2002-Mar-05
		 5.8.0				   2002-Jul-18
			 5.8.1			   2003-Sep-25

Incompatible Changes
       Hash Randomisation

       Mainly due to security reasons, the "random ordering" of hashes has
       been made even more random.  Previously while the order of hash ele-
       ments from keys(), values(), and each() was essentially random, it was
       still repeatable.  Now, however, the order varies between different
       runs of Perl.

       Perl has never guaranteed any ordering of the hash keys, and the order-
       ing has already changed several times during the lifetime of Perl 5.
       Also, the ordering of hash keys has always been, and continues to be,
       affected by the insertion order.

       The added randomness may affect applications.

       One possible scenario is when output of an application has included
       hash data.  For example, if you have used the Data::Dumper module to
       dump data into different files, and then compared the files to see
       whether the data has changed, now you will have false positives since
       the order in which hashes are dumped will vary.	In general the cure is
       to sort the keys (or the values); in particular for Data::Dumper to use
       the "Sortkeys" option.  If some particular order is really important,
       use tied hashes: for example the Tie::IxHash module which by default
       preserves the order in which the hash elements were added.

       More subtle problem is reliance on the order of "global destruction".
       That is what happens at the end of execution: Perl destroys all data
       structures, including user data.  If your destructors (the DESTROY sub-
       routines) have assumed any particular ordering to the global destruc-
       tion, there might be problems ahead.  For example, in a destructor of
       one object you cannot assume that objects of any other class are still
       available, unless you hold a reference to them.	If the environment
       variable PERL_DESTRUCT_LEVEL is set to a non-zero value, or if Perl is
       exiting a spawned thread, it will also destruct the ordinary references
       and the symbol tables that are no longer in use.  You can't call a
       class method or an ordinary function on a class that has been collected
       that way.

       The hash randomisation is certain to reveal hidden assumptions about
       some particular ordering of hash elements, and outright bugs: it
       revealed a few bugs in the Perl core and core modules.

       To disable the hash randomisation in runtime, set the environment vari-
       able PERL_HASH_SEED to 0 (zero) before running Perl (for more informa-
       tion see "PERL_HASH_SEED" in perlrun), or to disable the feature com-
       pletely in compile time, compile with "-DNO_HASH_SEED" (see INSTALL).

       See "Algorithmic Complexity Attacks" in perlsec for the original ratio-
       nale behind this change.

       UTF-8 On Filehandles No Longer Activated By Locale

       In Perl 5.8.0 all filehandles, including the standard filehandles, were
       implicitly set to be in Unicode UTF-8 if the locale settings indicated
       the use of UTF-8.  This feature caused too many problems, so the fea-
       ture was turned off and redesigned: see "Core Enhancements".

       Single-number v-strings are no longer v-strings before "=>"

       The version strings or v-strings (see "Version Strings" in perldata)
       feature introduced in Perl 5.6.0 has been a source of some confusion--
       especially when the user did not want to use it, but Perl thought it
       knew better.  Especially troublesome has been the feature that before a
       "=>" a version string (a "v" followed by digits) has been interpreted
       as a v-string instead of a string literal.  In other words:

	       %h = ( v65 => 42 );

       has meant since Perl 5.6.0

	       %h = ( 'A' => 42 );

       (at least in platforms of ASCII progeny)  Perl 5.8.1 restores the more
       natural interpretation

	       %h = ( 'v65' => 42 );

       The multi-number v-strings like v65.66 and 65.66.67 still continue to
       be v-strings in Perl 5.8.

       (Win32) The -C Switch Has Been Repurposed

       The -C switch has changed in an incompatible way.  The old semantics of
       this switch only made sense in Win32 and only in the "use utf8" uni-
       verse in 5.6.x releases, and do not make sense for the Unicode imple-
       mentation in 5.8.0.  Since this switch could not have been used by any-
       one, it has been repurposed.  The behavior that this switch enabled in
       5.6.x releases may be supported in a transparent, data-dependent fash-
       ion in a future release.

       For the new life of this switch, see "UTF-8 no longer default under
       UTF-8 locales", and "-C" in perlrun.

       (Win32) The /d Switch Of cmd.exe

       Perl 5.8.1 uses the /d switch when running the cmd.exe shell internally
       for system(), backticks, and when opening pipes to external programs.
       The extra switch disables the execution of AutoRun commands from the
       registry, which is generally considered undesirable when running exter-
       nal programs.  If you wish to retain compatibility with the older
       behavior, set PERL5SHELL in your environment to "cmd /x/c".

Core Enhancements
       UTF-8 no longer default under UTF-8 locales

       In Perl 5.8.0 many Unicode features were introduced.   One of them was
       found to be of more nuisance than benefit: the automagic (and silent)
       "UTF-8-ification" of filehandles, including the standard filehandles,
       if the user's locale settings indicated use of UTF-8.

       For example, if you had "en_US.UTF-8" as your locale, your STDIN and
       STDOUT were automatically "UTF-8", in other words an implicit bin-
       mode(..., ":utf8") was made.  This meant that trying to print, say,
       chr(0xff), ended up printing the bytes 0xc3 0xbf.  Hardly what you had
       in mind unless you were aware of this feature of Perl 5.8.0.  The prob-
       lem is that the vast majority of people weren't: for example in RedHat
       releases 8 and 9 the default locale setting is UTF-8, so all RedHat
       users got UTF-8 filehandles, whether they wanted it or not.  The pain
       was intensified by the Unicode implementation of Perl 5.8.0 (still)
       having nasty bugs, especially related to the use of s/// and tr///.
       (Bugs that have been fixed in 5.8.1)

       Therefore a decision was made to backtrack the feature and change it
       from implicit silent default to explicit conscious option.  The new
       Perl command line option "-C" and its counterpart environment variable
       PERL_UNICODE can now be used to control how Perl and Unicode interact
       at interfaces like I/O and for example the command line arguments.  See
       "-C" in perlrun and "PERL_UNICODE" in perlrun for more information.

       Unsafe signals again available

       In Perl 5.8.0 the so-called "safe signals" were introduced.  This means
       that Perl no longer handles signals immediately but instead "between
       opcodes", when it is safe to do so.  The earlier immediate handling
       easily could corrupt the internal state of Perl, resulting in mysteri-
       ous crashes.

       However, the new safer model has its problems too.  Because now an
       opcode, a basic unit of Perl execution, is never interrupted but
       instead let to run to completion, certain operations that can take a
       long time now really do take a long time.  For example, certain network
       operations have their own blocking and timeout mechanisms, and being
       able to interrupt them immediately would be nice.

       Therefore perl 5.8.1 introduces a "backdoor" to restore the pre-5.8.0
       (pre-5.7.3, really) signal behaviour.  Just set the environment vari-
       able PERL_SIGNALS to "unsafe", and the old immediate (and unsafe) sig-
       nal handling behaviour returns.	See "PERL_SIGNALS" in perlrun and
       "Deferred Signals (Safe Signals)" in perlipc.

       In completely unrelated news, you can now use safe signals with
       POSIX::SigAction.  See "POSIX::SigAction" in POSIX.

       Tied Arrays with Negative Array Indices

       Formerly, the indices passed to "FETCH", "STORE", "EXISTS", and
       "DELETE" methods in tied array class were always non-negative.  If the
       actual argument was negative, Perl would call FETCHSIZE implicitly and
       add the result to the index before passing the result to the tied array
       method.	This behaviour is now optional.  If the tied array class con-
       tains a package variable named $NEGATIVE_INDICES which is set to a true
       value, negative values will be passed to "FETCH", "STORE", "EXISTS",
       and "DELETE" unchanged.

       local ${$x}

       The syntaxes

	       local ${$x}
	       local @{$x}
	       local %{$x}

       now do localise variables, given that the $x is a valid variable name.

       Unicode Character Database 4.0.0

       The copy of the Unicode Character Database included in Perl 5.8 has
       been updated to 4.0.0 from 3.2.0.  This means for example that the Uni-
       code character properties are as in Unicode 4.0.0.

       Deprecation Warnings

       There is one new feature deprecation.  Perl 5.8.0 forgot to add some
       deprecation warnings, these warnings have now been added.  Finally, a
       reminder of an impending feature removal.

       (Reminder) Pseudo-hashes are deprecated (really)

       Pseudo-hashes were deprecated in Perl 5.8.0 and will be removed in Perl
       5.10.0, see perl58delta for details.  Each attempt to access pseudo-
       hashes will trigger the warning "Pseudo-hashes are deprecated".	If you
       really want to continue using pseudo-hashes but not to see the depreca-
       tion warnings, use:

	   no warnings 'deprecated';

       Or you can continue to use the fields pragma, but please don't expect
       the data structures to be pseudohashes any more.

       (Reminder) 5.005-style threads are deprecated (really)

       5.005-style threads (activated by "use Thread;") were deprecated in
       Perl 5.8.0 and will be removed after Perl 5.8, see perl58delta for
       details.  Each 5.005-style thread creation will trigger the warning
       "5.005 threads are deprecated".	If you really want to continue using
       the 5.005 threads but not to see the deprecation warnings, use:

	   no warnings 'deprecated';

       (Reminder) The $* variable is deprecated (really)

       The $* variable controlling multi-line matching has been deprecated and
       will be removed after 5.8.  The variable has been deprecated for a long
       time, and a deprecation warning "Use of $* is deprecated" is given, now
       the variable will just finally be removed.  The functionality has been
       supplanted by the "/s" and "/m" modifiers on pattern matching.  If you
       really want to continue using the $*-variable but not to see the depre-
       cation warnings, use:

	   no warnings 'deprecated';

       Miscellaneous Enhancements

       "map" in void context is no longer expensive. "map" is now context
       aware, and will not construct a list if called in void context.

       If a socket gets closed by the server while printing to it, the client
       now gets a SIGPIPE.  While this new feature was not planned, it fell
       naturally out of PerlIO changes, and is to be considered an accidental
       feature.

       PerlIO::get_layers(FH) returns the names of the PerlIO layers active on
       a filehandle.

       PerlIO::via layers can now have an optional UTF8 method to indicate
       whether the layer wants to "auto-:utf8" the stream.

       utf8::is_utf8() has been added as a quick way to test whether a scalar
       is encoded internally in UTF-8 (Unicode).

Modules and Pragmata
       Updated Modules And Pragmata

       The following modules and pragmata have been updated since Perl 5.8.0:

       base
       B::Bytecode
	   In much better shape than it used to be.  Still far from perfect,
	   but maybe worth a try.

       B::Concise
       B::Deparse
       Benchmark
	   An optional feature, ":hireswallclock", now allows for high resolu-
	   tion wall clock times (uses Time::HiRes).

       ByteLoader
	   See B::Bytecode.

       bytes
	   Now has bytes::substr.

       CGI
       charnames
	   One can now have custom character name aliases.

       CPAN
	   There is now a simple command line frontend to the CPAN.pm module
	   called cpan.

       Data::Dumper
	   A new option, Pair, allows choosing the separator between hash keys
	   and values.

       DB_File
       Devel::PPPort
       Digest::MD5
       Encode
	   Significant updates on the encoding pragma functionality (tr/// and
	   the DATA filehandle, formats).

	   If a filehandle has been marked as to have an encoding, unmappable
	   characters are detected already during input, not later (when the
	   corrupted data is being used).

	   The ISO 8859-6 conversion table has been corrected (the 0x30..0x39
	   erroneously mapped to U+0660..U+0669, instead of U+0030..U+0039).
	   The GSM 03.38 conversion did not handle escape sequences correctly.
	   The UTF-7 encoding has been added (making Encode feature-complete
	   with Unicode::String).

       fields
       libnet
       Math::BigInt
	   A lot of bugs have been fixed since v1.60, the version included in
	   Perl v5.8.0. Especially noteworthy are the bug in Calc that caused
	   div and mod to fail for some large values, and the fixes to the
	   handling of bad inputs.

	   Some new features were added, e.g. the broot() method, you can now
	   pass parameters to config() to change some settings at runtime, and
	   it is now possible to trap the creation of NaN and infinity.

	   As usual, some optimizations took place and made the math overall a
	   tad faster. In some cases, quite a lot faster, actually. Especially
	   alternative libraries like Math::BigInt::GMP benefit from this. In
	   addition, a lot of the quite clunky routines like fsqrt() and
	   flog() are now much much faster.

       MIME::Base64
       NEXT
	   Diamond inheritance now works.

       Net::Ping
       PerlIO::scalar
	   Reading from non-string scalars (like the special variables, see
	   perlvar) now works.

       podlators
       Pod::LaTeX
       PodParsers
       Pod::Perldoc
	   Complete rewrite.  As a side-effect, no longer refuses to startup
	   when run by root.

       Scalar::Util
	   New utilities: refaddr, isvstring, looks_like_number, set_proto-
	   type.

       Storable
	   Can now store code references (via B::Deparse, so not foolproof).

       strict
	   Earlier versions of the strict pragma did not check the parameters
	   implicitly passed to its "import" (use) and "unimport" (no) rou-
	   tine.  This caused the false idiom such as:

		   use strict qw(@ISA);
		   @ISA = qw(Foo);

	   This however (probably) raised the false expectation that the
	   strict refs, vars and subs were being enforced (and that @ISA was
	   somehow "declared").  But the strict refs, vars, and subs are not
	   enforced when using this false idiom.

	   Starting from Perl 5.8.1, the above will cause an error to be
	   raised.  This may cause programs which used to execute seemingly
	   correctly without warnings and errors to fail when run under 5.8.1.
	   This happens because

		   use strict qw(@ISA);

	   will now fail with the error:

		   Unknown 'strict' tag(s) '@ISA'

	   The remedy to this problem is to replace this code with the correct
	   idiom:

		   use strict;
		   use vars qw(@ISA);
		   @ISA = qw(Foo);

       Term::ANSIcolor
       Test::Harness
	   Now much more picky about extra or missing output from test
	   scripts.

       Test::More
       Test::Simple
       Text::Balanced
       Time::HiRes
	   Use of nanosleep(), if available, allows mixing subsecond sleeps
	   with alarms.

       threads
	   Several fixes, for example for join() problems and memory leaks.
	   In some platforms (like Linux) that use glibc the minimum memory
	   footprint of one ithread has been reduced by several hundred kilo-
	   bytes.

       threads::shared
	   Many memory leaks have been fixed.

       Unicode::Collate
       Unicode::Normalize
       Win32::GetFolderPath
       Win32::GetOSVersion
	   Now returns extra information.

Utility Changes
       The "h2xs" utility now produces a more modern layout:
       Foo-Bar/lib/Foo/Bar.pm instead of Foo/Bar/Bar.pm.  Also, the boiler-
       plate test is now called t/Foo-Bar.t instead of t/1.t.

       The Perl debugger (lib/perl5db.pl) has now been extensively documented
       and bugs found while documenting have been fixed.

       "perldoc" has been rewritten from scratch to be more robust and fea-
       tureful.

       "perlcc -B" works now at least somewhat better, while "perlcc -c" is
       rather more broken.  (The Perl compiler suite as a whole continues to
       be experimental.)

New Documentation
       perl573delta has been added to list the differences between the (now
       quite obsolete) development releases 5.7.2 and 5.7.3.

       perl58delta has been added: it is the perldelta of 5.8.0, detailing the
       differences between 5.6.0 and 5.8.0.

       perlartistic has been added: it is the Artistic License in pod format,
       making it easier for modules to refer to it.

       perlcheat has been added: it is a Perl cheat sheet.

       perlgpl has been added: it is the GNU General Public License in pod
       format, making it easier for modules to refer to it.

       perlmacosx has been added to tell about the installation and use of
       Perl in Mac OS X.

       perlos400 has been added to tell about the installation and use of Perl
       in OS/400 PASE.

       perlreref has been added: it is a regular expressions quick reference.

Installation and Configuration Improvements
       The UNIX standard Perl location, /usr/bin/perl, is no longer overwrit-
       ten by default if it exists.  This change was very prudent because so
       many UNIX vendors already provide a /usr/bin/perl, but simultaneously
       many system utilities may depend on that exact version of Perl, so bet-
       ter not to overwrite it.

       One can now specify installation directories for site and vendor man
       and HTML pages, and site and vendor scripts.  See INSTALL.

       One can now specify a destination directory for Perl installation by
       specifying the DESTDIR variable for "make install".  (This feature is
       slightly different from the previous "Configure -Dinstallprefix=...".)
       See INSTALL.

       gcc versions 3.x introduced a new warning that caused a lot of noise
       during Perl compilation: "gcc -Ialreadyknowndirectory (warning: chang-
       ing search order)".  This warning has now been avoided by Configure
       weeding out such directories before the compilation.

       One can now build subsets of Perl core modules by using the Configure
       flags "-Dnoextensions=..." and "-Donlyextensions=...", see INSTALL.

       Platform-specific enhancements

       In Cygwin Perl can now be built with threads ("Configure -Dusei-
       threads").  This works with both Cygwin 1.3.22 and Cygwin 1.5.3.

       In newer FreeBSD releases Perl 5.8.0 compilation failed because of try-
       ing to use malloc.h, which in FreeBSD is just a dummy file, and a fatal
       error to even try to use.  Now malloc.h is not used.

       Perl is now known to build also in Hitachi HI-UXMPP.

       Perl is now known to build again in LynxOS.

       Mac OS X now installs with Perl version number embedded in installation
       directory names for easier upgrading of user-compiled Perl, and the
       installation directories in general are more standard.  In other words,
       the default installation no longer breaks the Apple-provided Perl.  On
       the other hand, with "Configure -Dprefix=/usr" you can now really
       replace the Apple-supplied Perl (please be careful).

       Mac OS X now builds Perl statically by default.	This change was done
       mainly for faster startup times.  The Apple-provided Perl is still
       dynamically linked and shared, and you can enable the sharedness for
       your own Perl builds by "Configure -Duseshrplib".

       Perl has been ported to IBM's OS/400 PASE environment.  The best way to
       build a Perl for PASE is to use an AIX host as a cross-compilation
       environment.  See README.os400.

       Yet another cross-compilation option has been added: now Perl builds on
       OpenZaurus, an Linux distribution based on Mandrake + Embedix for the
       Sharp Zaurus PDA.  See the Cross/README file.

       Tru64 when using gcc 3 drops the optimisation for toke.c to "-O2"
       because of gigantic memory use with the default "-O3".

       Tru64 can now build Perl with the newer Berkeley DBs.

       Building Perl on WinCE has been much enhanced, see README.ce and
       README.perlce.

Selected Bug Fixes
       Closures, eval and lexicals

       There have been many fixes in the area of anonymous subs, lexicals and
       closures.  Although this means that Perl is now more "correct", it is
       possible that some existing code will break that happens to rely on the
       faulty behaviour.  In practice this is unlikely unless your code con-
       tains a very complex nesting of anonymous subs, evals and lexicals.

       Generic fixes

       If an input filehandle is marked ":utf8" and Perl sees illegal UTF-8
       coming in when doing "", if warnings are enabled a warning is imme-
       diately given - instead of being silent about it and Perl being unhappy
       about the broken data later.  (The ":encoding(utf8)" layer also works
       the same way.)

       binmode(SOCKET, ":utf8") only worked on the input side, not on the out-
       put side of the socket.	Now it works both ways.

       For threaded Perls certain system database functions like getpwent()
       and getgrent() now grow their result buffer dynamically, instead of
       failing.  This means that at sites with lots of users and groups the
       functions no longer fail by returning only partial results.

       Perl 5.8.0 had accidentally broken the capability for users to define
       their own uppercase<->lowercase Unicode mappings (as advertised by the
       Camel).	This feature has been fixed and is also documented better.

       In 5.8.0 this

	       $some_unicode .= ;

       didn't work correctly but instead corrupted the data.  This has now
       been fixed.

       Tied methods like FETCH etc. may now safely access tied values, i.e.
       resulting in a recursive call to FETCH etc.  Remember to break the
       recursion, though.

       At startup Perl blocks the SIGFPE signal away since there isn't much
       Perl can do about it.  Previously this blocking was in effect also for
       programs executed from within Perl.  Now Perl restores the original
       SIGFPE handling routine, whatever it was, before running external pro-
       grams.

       Linenumbers in Perl scripts may now be greater than 65536, or 2**16.
       (Perl scripts have always been able to be larger than that, it's just
       that the linenumber for reported errors and warnings have "wrapped
       around".)  While scripts that large usually indicate a need to rethink
       your code a bit, such Perl scripts do exist, for example as results
       from generated code.  Now linenumbers can go all the way to 4294967296,
       or 2**32.

       Platform-specific fixes

       Linux

       o   Setting $0 works again (with certain limitations that Perl cannot
	   do much about: see "$0" in perlvar)

       HP-UX

       o   Setting $0 now works.

       VMS

       o   Configuration now tests for the presence of "poll()", and IO::Poll
	   now uses the vendor-supplied function if detected.

       o   A rare access violation at Perl start-up could occur if the Perl
	   image was installed with privileges or if there was an identifier
	   with the subsystem attribute set in the process's rightslist.
	   Either of these circumstances triggered tainting code that con-
	   tained a pointer bug.  The faulty pointer arithmetic has been
	   fixed.

       o   The length limit on values (not keys) in the %ENV hash has been
	   raised from 255 bytes to 32640 bytes (except when the
	   PERL_ENV_TABLES setting overrides the default use of logical names
	   for %ENV).  If it is necessary to access these long values from
	   outside Perl, be aware that they are implemented using search list
	   logical names that store the value in pieces, each 255-byte piece
	   (up to 128 of them) being an element in the search list. When doing
	   a lookup in %ENV from within Perl, the elements are combined into a
	   single value.  The existing VMS-specific ability to access individ-
	   ual elements of a search list logical name via the $ENV{'foo;N'}
	   syntax (where N is the search list index) is unimpaired.

       o   The piping implementation now uses local rather than global DCL
	   symbols for inter-process communication.

       o   File::Find could become confused when navigating to a relative
	   directory whose name collided with a logical name.  This problem
	   has been corrected by adding directory syntax to relative path
	   names, thus preventing logical name translation.

       Win32

       o   A memory leak in the fork() emulation has been fixed.

       o   The return value of the ioctl() built-in function was accidentally
	   broken in 5.8.0.  This has been corrected.

       o   The internal message loop executed by perl during blocking opera-
	   tions sometimes interfered with messages that were external to
	   Perl.  This often resulted in blocking operations terminating pre-
	   maturely or returning incorrect results, when Perl was executing
	   under environments that could generate Windows messages.  This has
	   been corrected.

       o   Pipes and sockets are now automatically in binary mode.

       o   The four-argument form of select() did not preserve $! (errno)
	   properly when there were errors in the underlying call.  This is
	   now fixed.

       o   The "CR CR LF" problem of has been fixed, binmode(FH, ":crlf") is
	   now effectively a no-op.

New or Changed Diagnostics
       All the warnings related to pack() and unpack() were made more informa-
       tive and consistent.

       Changed "A thread exited while %d threads were running"

       The old version

	   A thread exited while %d other threads were still running

       was misleading because the "other" included also the thread giving the
       warning.

       Removed "Attempt to clear a restricted hash"

       It is not illegal to clear a restricted hash, so the warning was
       removed.

       New "Illegal declaration of anonymous subroutine"

       You must specify the block of code for "sub".

       Changed "Invalid range "%s" in transliteration operator"

       The old version

	   Invalid [] range "%s" in transliteration operator

       was simply wrong because there are no "[] ranges" in tr///.

       New "Missing control char name in \c"

       Self-explanatory.

       New "Newline in left-justified string for %s"

       The padding spaces would appear after the newline, which is probably
       not what you had in mind.

       New "Possible precedence problem on bitwise %c operator"

       If you think this

	   $x & $y == 0

       tests whether the bitwise AND of $x and $y is zero, you will like this
       warning.

       New "Pseudo-hashes are deprecated"

       This warning should have been already in 5.8.0, since they are.

       New "read() on %s filehandle %s"

       You cannot read() (or sysread()) from a closed or unopened filehandle.

       New "5.005 threads are deprecated"

       This warning should have been already in 5.8.0, since they are.

       New "Tied variable freed while still in use"

       Something pulled the plug on a live tied variable, Perl plays safe by
       bailing out.

       New "To%s: illegal mapping '%s'"

       An illegal user-defined Unicode casemapping was specified.

       New "Use of freed value in iteration"

       Something modified the values being iterated over.  This is not good.

Changed Internals
       These news matter to you only if you either write XS code or like to
       know about or hack Perl internals (using Devel::Peek or any of the
       "B::" modules counts), or like to run Perl with the "-D" option.

       The embedding examples of perlembed have been reviewed to be uptodate
       and consistent: for example, the correct use of PERL_SYS_INIT3() and
       PERL_SYS_TERM().

       Extensive reworking of the pad code (the code responsible for lexical
       variables) has been conducted by Dave Mitchell.

       Extensive work on the v-strings by John Peacock.

       UTF-8 length and position cache: to speed up the handling of Unicode
       (UTF-8) scalars, a cache was introduced.  Potential problems exist if
       an extension bypasses the official APIs and directly modifies the PV of
       an SV: the UTF-8 cache does not get cleared as it should.

       APIs obsoleted in Perl 5.8.0, like sv_2pv, sv_catpvn, sv_catsv,
       sv_setsv, are again available.

       Certain Perl core C APIs like cxinc and regatom are no longer available
       at all to code outside the Perl core of the Perl core extensions.  This
       is intentional.	They never should have been available with the shorter
       names, and if you application depends on them, you should (be ashamed
       and) contact perl5-porters to discuss what are the proper APIs.

       Certain Perl core C APIs like "Perl_list" are no longer available with-
       out their "Perl_" prefix.  If your XS module stops working because some
       functions cannot be found, in many cases a simple fix is to add the
       "Perl_" prefix to the function and the thread context "aTHX_" as the
       first argument of the function call.  This is also how it should always
       have been done: letting the Perl_-less forms to leak from the core was
       an accident.  For cleaner embedding you can also force this for all
       APIs by defining at compile time the cpp define PERL_NO_SHORT_NAMES.

       Perl_save_bool() has been added.

       Regexp objects (those created with "qr") now have S-magic rather than
       R-magic.  This fixed regexps of the form /...(??{...;$x})/ to no longer
       ignore changes made to $x.  The S-magic avoids dropping the caching
       optimization and making (??{...}) constructs obscenely slow (and conse-
       quently useless).  See also "Magic Variables" in perlguts.  Reg-
       exp::Copy was affected by this change.

       The Perl internal debugging macros DEBUG() and DEB() have been renamed
       to PERL_DEBUG() and PERL_DEB() to avoid namespace conflicts.

       "-DL" removed (the leaktest had been broken and unsupported for years,
       use alternative debugging mallocs or tools like valgrind and Purify).

       Verbose modifier "v" added for "-DXv" and "-Dsv", see perlrun.

New Tests
       In Perl 5.8.0 there were about 69000 separate tests in about 700 test
       files, in Perl 5.8.1 there are about 77000 separate tests in about 780
       test files.  The exact numbers depend on the Perl configuration and on
       the operating system platform.

Known Problems
       The hash randomisation mentioned in "Incompatible Changes" is defi-
       nitely problematic: it will wake dormant bugs and shake out bad assump-
       tions.

       If you want to use mod_perl 2.x with Perl 5.8.1, you will need
       mod_perl-1.99_10 or higher.  Earlier versions of mod_perl 2.x do not
       work with the randomised hashes.  (mod_perl 1.x works fine.)  You will
       also need Apache::Test 1.04 or higher.

       Many of the rarer platforms that worked 100% or pretty close to it with
       perl 5.8.0 have been left a little bit untended since their maintainers
       have been otherwise busy lately, and therefore there will be more fail-
       ures on those platforms.  Such platforms include Mac OS Classic, IBM
       z/OS (and other EBCDIC platforms), and NetWare.	The most common Perl
       platforms (Unix and Unix-like, Microsoft platforms, and VMS) have large
       enough testing and expert population that they are doing well.

       Tied hashes in scalar context

       Tied hashes do not currently return anything useful in scalar context,
       for example when used as boolean tests:

	       if (%tied_hash) { ... }

       The current nonsensical behaviour is always to return false, regardless
       of whether the hash is empty or has elements.

       The root cause is that there is no interface for the implementors of
       tied hashes to implement the behaviour of a hash in scalar context.

       Net::Ping 450_service and 510_ping_udp failures

       The subtests 9 and 18 of lib/Net/Ping/t/450_service.t, and the subtest
       2 of lib/Net/Ping/t/510_ping_udp.t might fail if you have an unusual
       networking setup.  For example in the latter case the test is trying to
       send a UDP ping to the IP address 127.0.0.1.

       B::C

       The C-generating compiler backend B::C (the frontend being "perlcc -c")
       is even more broken than it used to be because of the extensive lexical
       variable changes.  (The good news is that B::Bytecode and ByteLoader
       are better than they used to be.)

Platform Specific Problems
       EBCDIC Platforms

       IBM z/OS and other EBCDIC platforms continue to be problematic regard-
       ing Unicode support.  Many Unicode tests are skipped when they really
       should be fixed.

       Cygwin 1.5 problems

       In Cygwin 1.5 the io/tell and op/sysio tests have failures for some yet
       unknown reason.	In 1.5.5 the threads tests stress_cv, stress_re, and
       stress_string are failing unless the environment variable PERLIO is set
       to "perlio" (which makes also the io/tell failure go away).

       Perl 5.8.1 does build and work well with Cygwin 1.3: with (uname -a)
       "CYGWIN_NT-5.0 ... 1.3.22(0.78/3/2) 2003-03-18 09:20 i686 ..."  a 100%
       "make test"  was achieved with "Configure -des -Duseithreads".

       HP-UX: HP cc warnings about sendfile and sendpath

       With certain HP C compiler releases (e.g. B.11.11.02) you will get many
       warnings like this (lines wrapped for easier reading):

	 cc: "/usr/include/sys/socket.h", line 504: warning 562:
	   Redeclaration of "sendfile" with a different storage class specifier:
	     "sendfile" will have internal linkage.
	 cc: "/usr/include/sys/socket.h", line 505: warning 562:
	   Redeclaration of "sendpath" with a different storage class specifier:
	     "sendpath" will have internal linkage.

       The warnings show up both during the build of Perl and during certain
       lib/ExtUtils tests that invoke the C compiler.  The warning, however,
       is not serious and can be ignored.

       IRIX: t/uni/tr_7jis.t falsely failing

       The test t/uni/tr_7jis.t is known to report failure under 'make test'
       or the test harness with certain releases of IRIX (at least IRIX 6.5
       and MIPSpro Compilers Version 7.3.1.1m), but if run manually the test
       fully passes.

       Mac OS X: no usemymalloc

       The Perl malloc ("-Dusemymalloc") does not work at all in Mac OS X.
       This is not that serious, though, since the native malloc works just
       fine.

       Tru64: No threaded builds with GNU cc (gcc)

       In the latest Tru64 releases (e.g. v5.1B or later) gcc cannot be used
       to compile a threaded Perl (-Duseithreads) because the system
       "" file doesn't know about gcc.

       Win32: sysopen, sysread, syswrite

       As of the 5.8.0 release, sysopen()/sysread()/syswrite() do not behave
       like they used to in 5.6.1 and earlier with respect to "text" mode.
       These built-ins now always operate in "binary" mode (even if sysopen()
       was passed the O_TEXT flag, or if binmode() was used on the file han-
       dle).  Note that this issue should only make a difference for disk
       files, as sockets and pipes have always been in "binary" mode in the
       Windows port.  As this behavior is currently considered a bug, compati-
       ble behavior may be re-introduced in a future release.  Until then, the
       use of sysopen(), sysread() and syswrite() is not supported for "text"
       mode operations.

Future Directions
       The following things might happen in future.  The first publicly avail-
       able releases having these characteristics will be the developer
       releases Perl 5.9.x, culminating in the Perl 5.10.0 release.  These are
       our best guesses at the moment: we reserve the right to rethink.

       o   PerlIO will become The Default.  Currently (in Perl 5.8.x) the
	   stdio library is still used if Perl thinks it can use certain
	   tricks to make stdio go really fast.  For future releases our goal
	   is to make PerlIO go even faster.

       o   A new feature called assertions will be available.  This means that
	   one can have code called assertions sprinkled in the code: usually
	   they are optimised away, but they can be enabled with the "-A"
	   option.

       o   A new operator "//" (defined-or) will be available.	This means
	   that one will be able to say

	       $a // $b

	   instead of

	      defined $a ? $a : $b

	   and

	      $c //= $d;

	   instead of

	      $c = $d unless defined $c;

	   The operator will have the same precedence and associativity as
	   "||".  A source code patch against the Perl 5.8.1 sources will be
	   available in CPAN as authors/id/H/HM/HMBRAND/dor-5.8.1.diff.

       o   "unpack()" will default to unpacking the $_.

       o   Various Copy-On-Write techniques will be investigated in hopes of
	   speeding up Perl.

       o   CPANPLUS, Inline, and Module::Build will become core modules.

       o   The ability to write true lexically scoped pragmas will be intro-
	   duced.

       o   Work will continue on the bytecompiler and byteloader.

       o   v-strings as they currently exist are scheduled to be deprecated.
	   The v-less form (1.2.3) will become a "version object" when used
	   with "use", "require", and $VERSION.  $^V will also be a "version
	   object" so the printf("%vd",...) construct will no longer be
	   needed.  The v-ful version (v1.2.3) will become obsolete.  The
	   equivalence of strings and v-strings (e.g.  that currently 5.8.0 is
	   equal to "\5\8\0") will go away.  There may be no deprecation warn-
	   ing for v-strings, though: it is quite hard to detect when
	   v-strings are being used safely, and when they are not.

       o   5.005 Threads Will Be Removed

       o   The $* Variable Will Be Removed (it was deprecated a long time ago)

       o   Pseudohashes Will Be Removed

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.com/ , 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 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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