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PERL5100DELTA(1)       Perl Programmers Reference Guide	      PERL5100DELTA(1)

NAME
       perl5100delta - what is new for perl 5.10.0

DESCRIPTION
       This document describes the differences between the 5.8.8 release and
       the 5.10.0 release.

       Many of the bug fixes in 5.10.0 were already seen in the 5.8.X
       maintenance releases; they are not duplicated here and are documented
       in the set of man pages named perl58[1-8]?delta.

Core Enhancements
   The "feature" pragma
       The "feature" pragma is used to enable new syntax that would break
       Perl's backwards-compatibility with older releases of the language.
       It's a lexical pragma, like "strict" or "warnings".

       Currently the following new features are available: "switch" (adds a
       switch statement), "say" (adds a "say" built-in function), and "state"
       (adds a "state" keyword for declaring "static" variables). Those
       features are described in their own sections of this document.

       The "feature" pragma is also implicitly loaded when you require a
       minimal perl version (with the "use VERSION" construct) greater than,
       or equal to, 5.9.5. See feature for details.

   New -E command-line switch
       -E is equivalent to -e, but it implicitly enables all optional features
       (like "use feature ":5.10"").

   Defined-or operator
       A new operator "//" (defined-or) has been implemented.  The following
       expression:

	   $a // $b

       is merely equivalent to

	  defined $a ? $a : $b

       and the statement

	  $c //= $d;

       can now be used instead of

	  $c = $d unless defined $c;

       The "//" operator has the same precedence and associativity as "||".
       Special care has been taken to ensure that this operator Do What You
       Mean while not breaking old code, but some edge cases involving the
       empty regular expression may now parse differently.  See perlop for
       details.

   Switch and Smart Match operator
       Perl 5 now has a switch statement. It's available when "use feature
       'switch'" is in effect. This feature introduces three new keywords,
       "given", "when", and "default":

	   given ($foo) {
	       when (/^abc/) { $abc = 1; }
	       when (/^def/) { $def = 1; }
	       when (/^xyz/) { $xyz = 1; }
	       default { $nothing = 1; }
	   }

       A more complete description of how Perl matches the switch variable
       against the "when" conditions is given in "Switch statements" in
       perlsyn.

       This kind of match is called smart match, and it's also possible to use
       it outside of switch statements, via the new "~~" operator. See "Smart
       matching in detail" in perlsyn.

       This feature was contributed by Robin Houston.

   Regular expressions
       Recursive Patterns
	   It is now possible to write recursive patterns without using the
	   "(??{})" construct. This new way is more efficient, and in many
	   cases easier to read.

	   Each capturing parenthesis can now be treated as an independent
	   pattern that can be entered by using the "(?PARNO)" syntax ("PARNO"
	   standing for "parenthesis number"). For example, the following
	   pattern will match nested balanced angle brackets:

	       /
		^		       # start of line
		(		       # start capture buffer 1
		   <		       #   match an opening angle bracket
		   (?:		       #   match one of:
		       (?>	       #     don't backtrack over the inside of this group
			   [^<>]+      #       one or more non angle brackets
		       )	       #     end non backtracking group
		   |		       #     ... or ...
		       (?1)	       #     recurse to bracket 1 and try it again
		   )*		       #   0 or more times.
		   >		       #   match a closing angle bracket
		)		       # end capture buffer one
		$		       # end of line
	       /x

	   PCRE users should note that Perl's recursive regex feature allows
	   backtracking into a recursed pattern, whereas in PCRE the recursion
	   is atomic or "possessive" in nature.	 As in the example above, you
	   can add (?>) to control this selectively.  (Yves Orton)

       Named Capture Buffers
	   It is now possible to name capturing parenthesis in a pattern and
	   refer to the captured contents by name. The naming syntax is
	   "(?<NAME>....)".  It's possible to backreference to a named buffer
	   with the "\k<NAME>" syntax. In code, the new magical hashes "%+"
	   and "%-" can be used to access the contents of the capture buffers.

	   Thus, to replace all doubled chars with a single copy, one could
	   write

	       s/(?<letter>.)\k<letter>/$+{letter}/g

	   Only buffers with defined contents will be "visible" in the "%+"
	   hash, so it's possible to do something like

	       foreach my $name (keys %+) {
		   print "content of buffer '$name' is $+{$name}\n";
	       }

	   The "%-" hash is a bit more complete, since it will contain array
	   refs holding values from all capture buffers similarly named, if
	   there should be many of them.

	   "%+" and "%-" are implemented as tied hashes through the new module
	   "Tie::Hash::NamedCapture".

	   Users exposed to the .NET regex engine will find that the perl
	   implementation differs in that the numerical ordering of the
	   buffers is sequential, and not "unnamed first, then named". Thus in
	   the pattern

	      /(A)(?<B>B)(C)(?<D>D)/

	   $1 will be 'A', $2 will be 'B', $3 will be 'C' and $4 will be 'D'
	   and not $1 is 'A', $2 is 'C' and $3 is 'B' and $4 is 'D' that a
	   .NET programmer would expect. This is considered a feature. :-)
	   (Yves Orton)

       Possessive Quantifiers
	   Perl now supports the "possessive quantifier" syntax of the "atomic
	   match" pattern. Basically a possessive quantifier matches as much
	   as it can and never gives any back. Thus it can be used to control
	   backtracking. The syntax is similar to non-greedy matching, except
	   instead of using a '?' as the modifier the '+' is used. Thus "?+",
	   "*+", "++", "{min,max}+" are now legal quantifiers. (Yves Orton)

       Backtracking control verbs
	   The regex engine now supports a number of special-purpose backtrack
	   control verbs: (*THEN), (*PRUNE), (*MARK), (*SKIP), (*COMMIT),
	   (*FAIL) and (*ACCEPT). See perlre for their descriptions. (Yves
	   Orton)

       Relative backreferences
	   A new syntax "\g{N}" or "\gN" where "N" is a decimal integer allows
	   a safer form of back-reference notation as well as allowing
	   relative backreferences. This should make it easier to generate and
	   embed patterns that contain backreferences. See "Capture buffers"
	   in perlre. (Yves Orton)

       "\K" escape
	   The functionality of Jeff Pinyan's module Regexp::Keep has been
	   added to the core. In regular expressions you can now use the
	   special escape "\K" as a way to do something like floating length
	   positive lookbehind. It is also useful in substitutions like:

	     s/(foo)bar/$1/g

	   that can now be converted to

	     s/foo\Kbar//g

	   which is much more efficient. (Yves Orton)

       Vertical and horizontal whitespace, and linebreak
	   Regular expressions now recognize the "\v" and "\h" escapes that
	   match vertical and horizontal whitespace, respectively. "\V" and
	   "\H" logically match their complements.

	   "\R" matches a generic linebreak, that is, vertical whitespace,
	   plus the multi-character sequence "\x0D\x0A".

   "say()"
       say() is a new built-in, only available when "use feature 'say'" is in
       effect, that is similar to print(), but that implicitly appends a
       newline to the printed string. See "say" in perlfunc. (Robin Houston)

   Lexical $_
       The default variable $_ can now be lexicalized, by declaring it like
       any other lexical variable, with a simple

	   my $_;

       The operations that default on $_ will use the lexically-scoped version
       of $_ when it exists, instead of the global $_.

       In a "map" or a "grep" block, if $_ was previously my'ed, then the $_
       inside the block is lexical as well (and scoped to the block).

       In a scope where $_ has been lexicalized, you can still have access to
       the global version of $_ by using $::_, or, more simply, by overriding
       the lexical declaration with "our $_". (Rafael Garcia-Suarez)

   The "_" prototype
       A new prototype character has been added. "_" is equivalent to "$" but
       defaults to $_ if the corresponding argument isn't supplied (both "$"
       and "_" denote a scalar). Due to the optional nature of the argument,
       you can only use it at the end of a prototype, or before a semicolon.

       This has a small incompatible consequence: the prototype() function has
       been adjusted to return "_" for some built-ins in appropriate cases
       (for example, "prototype('CORE::rmdir')"). (Rafael Garcia-Suarez)

   UNITCHECK blocks
       "UNITCHECK", a new special code block has been introduced, in addition
       to "BEGIN", "CHECK", "INIT" and "END".

       "CHECK" and "INIT" blocks, while useful for some specialized purposes,
       are always executed at the transition between the compilation and the
       execution of the main program, and thus are useless whenever code is
       loaded at runtime. On the other hand, "UNITCHECK" blocks are executed
       just after the unit which defined them has been compiled. See perlmod
       for more information. (Alex Gough)

   New Pragma, "mro"
       A new pragma, "mro" (for Method Resolution Order) has been added. It
       permits to switch, on a per-class basis, the algorithm that perl uses
       to find inherited methods in case of a multiple inheritance hierarchy.
       The default MRO hasn't changed (DFS, for Depth First Search). Another
       MRO is available: the C3 algorithm. See mro for more information.
       (Brandon Black)

       Note that, due to changes in the implementation of class hierarchy
       search, code that used to undef the *ISA glob will most probably break.
       Anyway, undef'ing *ISA had the side-effect of removing the magic on the
       @ISA array and should not have been done in the first place. Also, the
       cache *::ISA::CACHE:: no longer exists; to force reset the @ISA cache,
       you now need to use the "mro" API, or more simply to assign to @ISA
       (e.g. with "@ISA = @ISA").

   readdir() may return a "short filename" on Windows
       The readdir() function may return a "short filename" when the long
       filename contains characters outside the ANSI codepage.	Similarly
       Cwd::cwd() may return a short directory name, and glob() may return
       short names as well.  On the NTFS file system these short names can
       always be represented in the ANSI codepage.  This will not be true for
       all other file system drivers; e.g. the FAT filesystem stores short
       filenames in the OEM codepage, so some files on FAT volumes remain
       unaccessible through the ANSI APIs.

       Similarly, $^X, @INC, and $ENV{PATH} are preprocessed at startup to
       make sure all paths are valid in the ANSI codepage (if possible).

       The Win32::GetLongPathName() function now returns the UTF-8 encoded
       correct long file name instead of using replacement characters to force
       the name into the ANSI codepage.	 The new Win32::GetANSIPathName()
       function can be used to turn a long pathname into a short one only if
       the long one cannot be represented in the ANSI codepage.

       Many other functions in the "Win32" module have been improved to accept
       UTF-8 encoded arguments.	 Please see Win32 for details.

   readpipe() is now overridable
       The built-in function readpipe() is now overridable. Overriding it
       permits also to override its operator counterpart, "qx//" (a.k.a.
       "``").  Moreover, it now defaults to $_ if no argument is provided.
       (Rafael Garcia-Suarez)

   Default argument for readline()
       readline() now defaults to *ARGV if no argument is provided. (Rafael
       Garcia-Suarez)

   state() variables
       A new class of variables has been introduced. State variables are
       similar to "my" variables, but are declared with the "state" keyword in
       place of "my". They're visible only in their lexical scope, but their
       value is persistent: unlike "my" variables, they're not undefined at
       scope entry, but retain their previous value. (Rafael Garcia-Suarez,
       Nicholas Clark)

       To use state variables, one needs to enable them by using

	   use feature 'state';

       or by using the "-E" command-line switch in one-liners.	See
       "Persistent Private Variables" in perlsub.

   Stacked filetest operators
       As a new form of syntactic sugar, it's now possible to stack up
       filetest operators. You can now write "-f -w -x $file" in a row to mean
       "-x $file && -w _ && -f _". See "-X" in perlfunc.

   UNIVERSAL::DOES()
       The "UNIVERSAL" class has a new method, "DOES()". It has been added to
       solve semantic problems with the "isa()" method. "isa()" checks for
       inheritance, while "DOES()" has been designed to be overridden when
       module authors use other types of relations between classes (in
       addition to inheritance). (chromatic)

       See "$obj->DOES( ROLE )" in UNIVERSAL.

   Formats
       Formats were improved in several ways. A new field, "^*", can be used
       for variable-width, one-line-at-a-time text. Null characters are now
       handled correctly in picture lines. Using "@#" and "~~" together will
       now produce a compile-time error, as those format fields are
       incompatible.  perlform has been improved, and miscellaneous bugs
       fixed.

   Byte-order modifiers for pack() and unpack()
       There are two new byte-order modifiers, ">" (big-endian) and "<"
       (little-endian), that can be appended to most pack() and unpack()
       template characters and groups to force a certain byte-order for that
       type or group.  See "pack" in perlfunc and perlpacktut for details.

   "no VERSION"
       You can now use "no" followed by a version number to specify that you
       want to use a version of perl older than the specified one.

   "chdir", "chmod" and "chown" on filehandles
       "chdir", "chmod" and "chown" can now work on filehandles as well as
       filenames, if the system supports respectively "fchdir", "fchmod" and
       "fchown", thanks to a patch provided by Gisle Aas.

   OS groups
       $( and $) now return groups in the order where the OS returns them,
       thanks to Gisle Aas. This wasn't previously the case.

   Recursive sort subs
       You can now use recursive subroutines with sort(), thanks to Robin
       Houston.

   Exceptions in constant folding
       The constant folding routine is now wrapped in an exception handler,
       and if folding throws an exception (such as attempting to evaluate
       0/0), perl now retains the current optree, rather than aborting the
       whole program.  Without this change, programs would not compile if they
       had expressions that happened to generate exceptions, even though those
       expressions were in code that could never be reached at runtime.
       (Nicholas Clark, Dave Mitchell)

   Source filters in @INC
       It's possible to enhance the mechanism of subroutine hooks in @INC by
       adding a source filter on top of the filehandle opened and returned by
       the hook. This feature was planned a long time ago, but wasn't quite
       working until now. See "require" in perlfunc for details. (Nicholas
       Clark)

   New internal variables
       "${^RE_DEBUG_FLAGS}"
	   This variable controls what debug flags are in effect for the
	   regular expression engine when running under "use re "debug"". See
	   re for details.

       "${^CHILD_ERROR_NATIVE}"
	   This variable gives the native status returned by the last pipe
	   close, backtick command, successful call to wait() or waitpid(), or
	   from the system() operator. See perlvar for details. (Contributed
	   by Gisle Aas.)

       "${^RE_TRIE_MAXBUF}"
	   See "Trie optimisation of literal string alternations".

       "${^WIN32_SLOPPY_STAT}"
	   See "Sloppy stat on Windows".

   Miscellaneous
       "unpack()" now defaults to unpacking the $_ variable.

       "mkdir()" without arguments now defaults to $_.

       The internal dump output has been improved, so that non-printable
       characters such as newline and backspace are output in "\x" notation,
       rather than octal.

       The -C option can no longer be used on the "#!" line. It wasn't working
       there anyway, since the standard streams are already set up at this
       point in the execution of the perl interpreter. You can use binmode()
       instead to get the desired behaviour.

   UCD 5.0.0
       The copy of the Unicode Character Database included in Perl 5 has been
       updated to version 5.0.0.

   MAD
       MAD, which stands for Miscellaneous Attribute Decoration, is a still-
       in-development work leading to a Perl 5 to Perl 6 converter. To enable
       it, it's necessary to pass the argument "-Dmad" to Configure. The
       obtained perl isn't binary compatible with a regular perl 5.10, and has
       space and speed penalties; moreover not all regression tests still pass
       with it. (Larry Wall, Nicholas Clark)

   kill() on Windows
       On Windows platforms, "kill(-9, $pid)" now kills a process tree.	 (On
       UNIX, this delivers the signal to all processes in the same process
       group.)

Incompatible Changes
   Packing and UTF-8 strings
       The semantics of pack() and unpack() regarding UTF-8-encoded data has
       been changed. Processing is now by default character per character
       instead of byte per byte on the underlying encoding. Notably, code that
       used things like "pack("a*", $string)" to see through the encoding of
       string will now simply get back the original $string. Packed strings
       can also get upgraded during processing when you store upgraded
       characters. You can get the old behaviour by using "use bytes".

       To be consistent with pack(), the "C0" in unpack() templates indicates
       that the data is to be processed in character mode, i.e. character by
       character; on the contrary, "U0" in unpack() indicates UTF-8 mode,
       where the packed string is processed in its UTF-8-encoded Unicode form
       on a byte by byte basis. This is reversed with regard to perl 5.8.X,
       but now consistent between pack() and unpack().

       Moreover, "C0" and "U0" can also be used in pack() templates to specify
       respectively character and byte modes.

       "C0" and "U0" in the middle of a pack or unpack format now switch to
       the specified encoding mode, honoring parens grouping. Previously,
       parens were ignored.

       Also, there is a new pack() character format, "W", which is intended to
       replace the old "C". "C" is kept for unsigned chars coded as bytes in
       the strings internal representation. "W" represents unsigned (logical)
       character values, which can be greater than 255. It is therefore more
       robust when dealing with potentially UTF-8-encoded data (as "C" will
       wrap values outside the range 0..255, and not respect the string
       encoding).

       In practice, that means that pack formats are now encoding-neutral,
       except "C".

       For consistency, "A" in unpack() format now trims all Unicode
       whitespace from the end of the string. Before perl 5.9.2, it used to
       strip only the classical ASCII space characters.

   Byte/character count feature in unpack()
       A new unpack() template character, ".", returns the number of bytes or
       characters (depending on the selected encoding mode, see above) read so
       far.

   The $* and $# variables have been removed
       $*, which was deprecated in favor of the "/s" and "/m" regexp
       modifiers, has been removed.

       The deprecated $# variable (output format for numbers) has been
       removed.

       Two new severe warnings, "$#/$* is no longer supported", have been
       added.

   substr() lvalues are no longer fixed-length
       The lvalues returned by the three argument form of substr() used to be
       a "fixed length window" on the original string. In some cases this
       could cause surprising action at distance or other undefined behaviour.
       Now the length of the window adjusts itself to the length of the string
       assigned to it.

   Parsing of "-f _"
       The identifier "_" is now forced to be a bareword after a filetest
       operator. This solves a number of misparsing issues when a global "_"
       subroutine is defined.

   ":unique"
       The ":unique" attribute has been made a no-op, since its current
       implementation was fundamentally flawed and not threadsafe.

   Effect of pragmas in eval
       The compile-time value of the "%^H" hint variable can now propagate
       into eval("")uated code. This makes it more useful to implement lexical
       pragmas.

       As a side-effect of this, the overloaded-ness of constants now
       propagates into eval("").

   chdir FOO
       A bareword argument to chdir() is now recognized as a file handle.
       Earlier releases interpreted the bareword as a directory name.  (Gisle
       Aas)

   Handling of .pmc files
       An old feature of perl was that before "require" or "use" look for a
       file with a .pm extension, they will first look for a similar filename
       with a .pmc extension. If this file is found, it will be loaded in
       place of any potentially existing file ending in a .pm extension.

       Previously, .pmc files were loaded only if more recent than the
       matching .pm file. Starting with 5.9.4, they'll be always loaded if
       they exist.

   $^V is now a "version" object instead of a v-string
       $^V can still be used with the %vd format in printf, but any character-
       level operations will now access the string representation of the
       "version" object and not the ordinals of a v-string.  Expressions like
       "substr($^V, 0, 2)" or "split //, $^V" no longer work and must be
       rewritten.

   @- and @+ in patterns
       The special arrays "@-" and "@+" are no longer interpolated in regular
       expressions. (Sadahiro Tomoyuki)

   $AUTOLOAD can now be tainted
       If you call a subroutine by a tainted name, and if it defers to an
       AUTOLOAD function, then $AUTOLOAD will be (correctly) tainted.  (Rick
       Delaney)

   Tainting and printf
       When perl is run under taint mode, "printf()" and "sprintf()" will now
       reject any tainted format argument. (Rafael Garcia-Suarez)

   undef and signal handlers
       Undefining or deleting a signal handler via "undef $SIG{FOO}" is now
       equivalent to setting it to 'DEFAULT'. (Rafael Garcia-Suarez)

   strictures and dereferencing in defined()
       "use strict 'refs'" was ignoring taking a hard reference in an argument
       to defined(), as in :

	   use strict 'refs';
	   my $x = 'foo';
	   if (defined $$x) {...}

       This now correctly produces the run-time error "Can't use string as a
       SCALAR ref while "strict refs" in use".

       "defined @$foo" and "defined %$bar" are now also subject to "strict
       'refs'" (that is, $foo and $bar shall be proper references there.)
       ("defined(@foo)" and "defined(%bar)" are discouraged constructs
       anyway.)	 (Nicholas Clark)

   "(?p{})" has been removed
       The regular expression construct "(?p{})", which was deprecated in perl
       5.8, has been removed. Use "(??{})" instead. (Rafael Garcia-Suarez)

   Pseudo-hashes have been removed
       Support for pseudo-hashes has been removed from Perl 5.9. (The "fields"
       pragma remains here, but uses an alternate implementation.)

   Removal of the bytecode compiler and of perlcc
       "perlcc", the byteloader and the supporting modules (B::C, B::CC,
       B::Bytecode, etc.) are no longer distributed with the perl sources.
       Those experimental tools have never worked reliably, and, due to the
       lack of volunteers to keep them in line with the perl interpreter
       developments, it was decided to remove them instead of shipping a
       broken version of those.	 The last version of those modules can be
       found with perl 5.9.4.

       However the B compiler framework stays supported in the perl core, as
       with the more useful modules it has permitted (among others, B::Deparse
       and B::Concise).

   Removal of the JPL
       The JPL (Java-Perl Lingo) has been removed from the perl sources
       tarball.

   Recursive inheritance detected earlier
       Perl will now immediately throw an exception if you modify any
       package's @ISA in such a way that it would cause recursive inheritance.

       Previously, the exception would not occur until Perl attempted to make
       use of the recursive inheritance while resolving a method or doing a
       "$foo->isa($bar)" lookup.

Modules and Pragmata
   Upgrading individual core modules
       Even more core modules are now also available separately through the
       CPAN.  If you wish to update one of these modules, you don't need to
       wait for a new perl release.  From within the cpan shell, running the
       'r' command will report on modules with upgrades available.  See
       "perldoc CPAN" for more information.

   Pragmata Changes
       "feature"
	   The new pragma "feature" is used to enable new features that might
	   break old code. See "The "feature" pragma" above.

       "mro"
	   This new pragma enables to change the algorithm used to resolve
	   inherited methods. See "New Pragma, "mro"" above.

       Scoping of the "sort" pragma
	   The "sort" pragma is now lexically scoped. Its effect used to be
	   global.

       Scoping of "bignum", "bigint", "bigrat"
	   The three numeric pragmas "bignum", "bigint" and "bigrat" are now
	   lexically scoped. (Tels)

       "base"
	   The "base" pragma now warns if a class tries to inherit from
	   itself.  (Curtis "Ovid" Poe)

       "strict" and "warnings"
	   "strict" and "warnings" will now complain loudly if they are loaded
	   via incorrect casing (as in "use Strict;"). (Johan Vromans)

       "version"
	   The "version" module provides support for version objects.

       "warnings"
	   The "warnings" pragma doesn't load "Carp" anymore. That means that
	   code that used "Carp" routines without having loaded it at compile
	   time might need to be adjusted; typically, the following (faulty)
	   code won't work anymore, and will require parentheses to be added
	   after the function name:

	       use warnings;
	       require Carp;
	       Carp::confess 'argh';

       "less"
	   "less" now does something useful (or at least it tries to). In
	   fact, it has been turned into a lexical pragma. So, in your
	   modules, you can now test whether your users have requested to use
	   less CPU, or less memory, less magic, or maybe even less fat. See
	   less for more. (Joshua ben Jore)

   New modules
       ·   "encoding::warnings", by Audrey Tang, is a module to emit warnings
	   whenever an ASCII character string containing high-bit bytes is
	   implicitly converted into UTF-8. It's a lexical pragma since Perl
	   5.9.4; on older perls, its effect is global.

       ·   "Module::CoreList", by Richard Clamp, is a small handy module that
	   tells you what versions of core modules ship with any versions of
	   Perl 5. It comes with a command-line frontend, "corelist".

       ·   "Math::BigInt::FastCalc" is an XS-enabled, and thus faster, version
	   of "Math::BigInt::Calc".

       ·   "Compress::Zlib" is an interface to the zlib compression library.
	   It comes with a bundled version of zlib, so having a working zlib
	   is not a prerequisite to install it. It's used by "Archive::Tar"
	   (see below).

       ·   "IO::Zlib" is an "IO::"-style interface to "Compress::Zlib".

       ·   "Archive::Tar" is a module to manipulate "tar" archives.

       ·   "Digest::SHA" is a module used to calculate many types of SHA
	   digests, has been included for SHA support in the CPAN module.

       ·   "ExtUtils::CBuilder" and "ExtUtils::ParseXS" have been added.

       ·   "Hash::Util::FieldHash", by Anno Siegel, has been added. This
	   module provides support for field hashes: hashes that maintain an
	   association of a reference with a value, in a thread-safe garbage-
	   collected way.  Such hashes are useful to implement inside-out
	   objects.

       ·   "Module::Build", by Ken Williams, has been added. It's an
	   alternative to "ExtUtils::MakeMaker" to build and install perl
	   modules.

       ·   "Module::Load", by Jos Boumans, has been added. It provides a
	   single interface to load Perl modules and .pl files.

       ·   "Module::Loaded", by Jos Boumans, has been added. It's used to mark
	   modules as loaded or unloaded.

       ·   "Package::Constants", by Jos Boumans, has been added. It's a simple
	   helper to list all constants declared in a given package.

       ·   "Win32API::File", by Tye McQueen, has been added (for Windows
	   builds).  This module provides low-level access to Win32 system API
	   calls for files/dirs.

       ·   "Locale::Maketext::Simple", needed by CPANPLUS, is a simple wrapper
	   around "Locale::Maketext::Lexicon". Note that
	   "Locale::Maketext::Lexicon" isn't included in the perl core; the
	   behaviour of "Locale::Maketext::Simple" gracefully degrades when
	   the later isn't present.

       ·   "Params::Check" implements a generic input parsing/checking
	   mechanism. It is used by CPANPLUS.

       ·   "Term::UI" simplifies the task to ask questions at a terminal
	   prompt.

       ·   "Object::Accessor" provides an interface to create per-object
	   accessors.

       ·   "Module::Pluggable" is a simple framework to create modules that
	   accept pluggable sub-modules.

       ·   "Module::Load::Conditional" provides simple ways to query and
	   possibly load installed modules.

       ·   "Time::Piece" provides an object oriented interface to time
	   functions, overriding the built-ins localtime() and gmtime().

       ·   "IPC::Cmd" helps to find and run external commands, possibly
	   interactively.

       ·   "File::Fetch" provide a simple generic file fetching mechanism.

       ·   "Log::Message" and "Log::Message::Simple" are used by the log
	   facility of "CPANPLUS".

       ·   "Archive::Extract" is a generic archive extraction mechanism for
	   .tar (plain, gziped or bzipped) or .zip files.

       ·   "CPANPLUS" provides an API and a command-line tool to access the
	   CPAN mirrors.

       ·   "Pod::Escapes" provides utilities that are useful in decoding Pod
	   E<...> sequences.

       ·   "Pod::Simple" is now the backend for several of the Pod-related
	   modules included with Perl.

   Selected Changes to Core Modules
       "Attribute::Handlers"
	   "Attribute::Handlers" can now report the caller's file and line
	   number.  (David Feldman)

	   All interpreted attributes are now passed as array references.
	   (Damian Conway)

       "B::Lint"
	   "B::Lint" is now based on "Module::Pluggable", and so can be
	   extended with plugins. (Joshua ben Jore)

       "B" It's now possible to access the lexical pragma hints ("%^H") by
	   using the method B::COP::hints_hash(). It returns a "B::RHE"
	   object, which in turn can be used to get a hash reference via the
	   method B::RHE::HASH(). (Joshua ben Jore)

       "Thread"
	   As the old 5005thread threading model has been removed, in favor of
	   the ithreads scheme, the "Thread" module is now a compatibility
	   wrapper, to be used in old code only. It has been removed from the
	   default list of dynamic extensions.

Utility Changes
       perl -d
	   The Perl debugger can now save all debugger commands for sourcing
	   later; notably, it can now emulate stepping backwards, by
	   restarting and rerunning all bar the last command from a saved
	   command history.

	   It can also display the parent inheritance tree of a given class,
	   with the "i" command.

       ptar
	   "ptar" is a pure perl implementation of "tar" that comes with
	   "Archive::Tar".

       ptardiff
	   "ptardiff" is a small utility used to generate a diff between the
	   contents of a tar archive and a directory tree. Like "ptar", it
	   comes with "Archive::Tar".

       shasum
	   "shasum" is a command-line utility, used to print or to check SHA
	   digests. It comes with the new "Digest::SHA" module.

       corelist
	   The "corelist" utility is now installed with perl (see "New
	   modules" above).

       h2ph and h2xs
	   "h2ph" and "h2xs" have been made more robust with regard to
	   "modern" C code.

	   "h2xs" implements a new option "--use-xsloader" to force use of
	   "XSLoader" even in backwards compatible modules.

	   The handling of authors' names that had apostrophes has been fixed.

	   Any enums with negative values are now skipped.

       perlivp
	   "perlivp" no longer checks for *.ph files by default.  Use the new
	   "-a" option to run all tests.

       find2perl
	   "find2perl" now assumes "-print" as a default action. Previously,
	   it needed to be specified explicitly.

	   Several bugs have been fixed in "find2perl", regarding "-exec" and
	   "-eval". Also the options "-path", "-ipath" and "-iname" have been
	   added.

       config_data
	   "config_data" is a new utility that comes with "Module::Build". It
	   provides a command-line interface to the configuration of Perl
	   modules that use Module::Build's framework of configurability (that
	   is, *::ConfigData modules that contain local configuration
	   information for their parent modules.)

       cpanp
	   "cpanp", the CPANPLUS shell, has been added. ("cpanp-run-perl", a
	   helper for CPANPLUS operation, has been added too, but isn't
	   intended for direct use).

       cpan2dist
	   "cpan2dist" is a new utility that comes with CPANPLUS. It's a tool
	   to create distributions (or packages) from CPAN modules.

       pod2html
	   The output of "pod2html" has been enhanced to be more customizable
	   via CSS. Some formatting problems were also corrected. (Jari Aalto)

New Documentation
       The perlpragma manpage documents how to write one's own lexical pragmas
       in pure Perl (something that is possible starting with 5.9.4).

       The new perlglossary manpage is a glossary of terms used in the Perl
       documentation, technical and otherwise, kindly provided by O'Reilly
       Media, Inc.

       The perlreguts manpage, courtesy of Yves Orton, describes internals of
       the Perl regular expression engine.

       The perlreapi manpage describes the interface to the perl interpreter
       used to write pluggable regular expression engines (by var Arnfjoer`
       Bjarmason).

       The perlunitut manpage is an tutorial for programming with Unicode and
       string encodings in Perl, courtesy of Juerd Waalboer.

       A new manual page, perlunifaq (the Perl Unicode FAQ), has been added
       (Juerd Waalboer).

       The perlcommunity manpage gives a description of the Perl community on
       the Internet and in real life. (Edgar "Trizor" Bering)

       The CORE manual page documents the "CORE::" namespace. (Tels)

       The long-existing feature of "/(?{...})/" regexps setting $_ and pos()
       is now documented.

Performance Enhancements
   In-place sorting
       Sorting arrays in place ("@a = sort @a") is now optimized to avoid
       making a temporary copy of the array.

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

   Lexical array access
       Access to elements of lexical arrays via a numeric constant between 0
       and 255 is now faster. (This used to be only the case for global
       arrays.)

   XS-assisted SWASHGET
       Some pure-perl code that perl was using to retrieve Unicode properties
       and transliteration mappings has been reimplemented in XS.

   Constant subroutines
       The interpreter internals now support a far more memory efficient form
       of inlineable constants. Storing a reference to a constant value in a
       symbol table is equivalent to a full typeglob referencing a constant
       subroutine, but using about 400 bytes less memory. This proxy constant
       subroutine is automatically upgraded to a real typeglob with subroutine
       if necessary.  The approach taken is analogous to the existing space
       optimisation for subroutine stub declarations, which are stored as
       plain scalars in place of the full typeglob.

       Several of the core modules have been converted to use this feature for
       their system dependent constants - as a result "use POSIX;" now takes
       about 200K less memory.

   "PERL_DONT_CREATE_GVSV"
       The new compilation flag "PERL_DONT_CREATE_GVSV", introduced as an
       option in perl 5.8.8, is turned on by default in perl 5.9.3. It
       prevents perl from creating an empty scalar with every new typeglob.
       See perl589delta for details.

   Weak references are cheaper
       Weak reference creation is now O(1) rather than O(n), courtesy of
       Nicholas Clark. Weak reference deletion remains O(n), but if deletion
       only happens at program exit, it may be skipped completely.

   sort() enhancements
       Salvador Fandin~o provided improvements to reduce the memory usage of
       "sort" and to speed up some cases.

   Memory optimisations
       Several internal data structures (typeglobs, GVs, CVs, formats) have
       been restructured to use less memory. (Nicholas Clark)

   UTF-8 cache optimisation
       The UTF-8 caching code is now more efficient, and used more often.
       (Nicholas Clark)

   Sloppy stat on Windows
       On Windows, perl's stat() function normally opens the file to determine
       the link count and update attributes that may have been changed through
       hard links. Setting ${^WIN32_SLOPPY_STAT} to a true value speeds up
       stat() by not performing this operation. (Jan Dubois)

   Regular expressions optimisations
       Engine de-recursivised
	   The regular expression engine is no longer recursive, meaning that
	   patterns that used to overflow the stack will either die with
	   useful explanations, or run to completion, which, since they were
	   able to blow the stack before, will likely take a very long time to
	   happen. If you were experiencing the occasional stack overflow (or
	   segfault) and upgrade to discover that now perl apparently hangs
	   instead, look for a degenerate regex. (Dave Mitchell)

       Single char char-classes treated as literals
	   Classes of a single character are now treated the same as if the
	   character had been used as a literal, meaning that code that uses
	   char-classes as an escaping mechanism will see a speedup. (Yves
	   Orton)

       Trie optimisation of literal string alternations
	   Alternations, where possible, are optimised into more efficient
	   matching structures. String literal alternations are merged into a
	   trie and are matched simultaneously.	 This means that instead of
	   O(N) time for matching N alternations at a given point, the new
	   code performs in O(1) time.	A new special variable,
	   ${^RE_TRIE_MAXBUF}, has been added to fine-tune this optimization.
	   (Yves Orton)

	   Note: Much code exists that works around perl's historic poor
	   performance on alternations. Often the tricks used to do so will
	   disable the new optimisations. Hopefully the utility modules used
	   for this purpose will be educated about these new optimisations.

       Aho-Corasick start-point optimisation
	   When a pattern starts with a trie-able alternation and there aren't
	   better optimisations available, the regex engine will use Aho-
	   Corasick matching to find the start point. (Yves Orton)

Installation and Configuration Improvements
   Configuration improvements
       "-Dusesitecustomize"
	   Run-time customization of @INC can be enabled by passing the
	   "-Dusesitecustomize" flag to Configure. When enabled, this will
	   make perl run $sitelibexp/sitecustomize.pl before anything else.
	   This script can then be set up to add additional entries to @INC.

       Relocatable installations
	   There is now Configure support for creating a relocatable perl
	   tree. If you Configure with "-Duserelocatableinc", then the paths
	   in @INC (and everything else in %Config) can be optionally located
	   via the path of the perl executable.

	   That means that, if the string ".../" is found at the start of any
	   path, it's substituted with the directory of $^X. So, the
	   relocation can be configured on a per-directory basis, although the
	   default with "-Duserelocatableinc" is that everything is relocated.
	   The initial install is done to the original configured prefix.

       strlcat() and strlcpy()
	   The configuration process now detects whether strlcat() and
	   strlcpy() are available.  When they are not available, perl's own
	   version is used (from Russ Allbery's public domain implementation).
	   Various places in the perl interpreter now use them. (Steve Peters)

       "d_pseudofork" and "d_printf_format_null"
	   A new configuration variable, available as $Config{d_pseudofork} in
	   the Config module, has been added, to distinguish real fork()
	   support from fake pseudofork used on Windows platforms.

	   A new configuration variable, "d_printf_format_null", has been
	   added, to see if printf-like formats are allowed to be NULL.

       Configure help
	   "Configure -h" has been extended with the most commonly used
	   options.

   Compilation improvements
       Parallel build
	   Parallel makes should work properly now, although there may still
	   be problems if "make test" is instructed to run in parallel.

       Borland's compilers support
	   Building with Borland's compilers on Win32 should work more
	   smoothly. In particular Steve Hay has worked to side step many
	   warnings emitted by their compilers and at least one C compiler
	   internal error.

       Static build on Windows
	   Perl extensions on Windows now can be statically built into the
	   Perl DLL.

	   Also, it's now possible to build a "perl-static.exe" that doesn't
	   depend on the Perl DLL on Win32. See the Win32 makefiles for
	   details.  (Vadim Konovalov)

       ppport.h files
	   All ppport.h files in the XS modules bundled with perl are now
	   autogenerated at build time. (Marcus Holland-Moritz)

       C++ compatibility
	   Efforts have been made to make perl and the core XS modules
	   compilable with various C++ compilers (although the situation is
	   not perfect with some of the compilers on some of the platforms
	   tested.)

       Support for Microsoft 64-bit compiler
	   Support for building perl with Microsoft's 64-bit compiler has been
	   improved. (ActiveState)

       Visual C++
	   Perl can now be compiled with Microsoft Visual C++ 2005 (and 2008
	   Beta 2).

       Win32 builds
	   All win32 builds (MS-Win, WinCE) have been merged and cleaned up.

   Installation improvements
       Module auxiliary files
	   README files and changelogs for CPAN modules bundled with perl are
	   no longer installed.

   New Or Improved Platforms
       Perl has been reported to work on Symbian OS. See perlsymbian for more
       information.

       Many improvements have been made towards making Perl work correctly on
       z/OS.

       Perl has been reported to work on DragonFlyBSD and MidnightBSD.

       Perl has also been reported to work on NexentaOS (
       http://www.gnusolaris.org/ ).

       The VMS port has been improved. See perlvms.

       Support for Cray XT4 Catamount/Qk has been added. See
       hints/catamount.sh in the source code distribution for more
       information.

       Vendor patches have been merged for RedHat and Gentoo.

       DynaLoader::dl_unload_file() now works on Windows.

Selected Bug Fixes
       strictures in regexp-eval blocks
	   "strict" wasn't in effect in regexp-eval blocks ("/(?{...})/").

       Calling CORE::require()
	   CORE::require() and CORE::do() were always parsed as require() and
	   do() when they were overridden. This is now fixed.

       Subscripts of slices
	   You can now use a non-arrowed form for chained subscripts after a
	   list slice, like in:

	       ({foo => "bar"})[0]{foo}

	   This used to be a syntax error; a "->" was required.

       "no warnings 'category'" works correctly with -w
	   Previously when running with warnings enabled globally via "-w",
	   selective disabling of specific warning categories would actually
	   turn off all warnings.  This is now fixed; now "no warnings 'io';"
	   will only turn off warnings in the "io" class. Previously it would
	   erroneously turn off all warnings.

       threads improvements
	   Several memory leaks in ithreads were closed. Also, ithreads were
	   made less memory-intensive.

	   "threads" is now a dual-life module, also available on CPAN. It has
	   been expanded in many ways. A kill() method is available for thread
	   signalling.	One can get thread status, or the list of running or
	   joinable threads.

	   A new "threads->exit()" method is used to exit from the application
	   (this is the default for the main thread) or from the current
	   thread only (this is the default for all other threads). On the
	   other hand, the exit() built-in now always causes the whole
	   application to terminate. (Jerry D. Hedden)

       chr() and negative values
	   chr() on a negative value now gives "\x{FFFD}", the Unicode
	   replacement character, unless when the "bytes" pragma is in effect,
	   where the low eight bits of the value are used.

       PERL5SHELL and tainting
	   On Windows, the PERL5SHELL environment variable is now checked for
	   taintedness. (Rafael Garcia-Suarez)

       Using *FILE{IO}
	   "stat()" and "-X" filetests now treat *FILE{IO} filehandles like
	   *FILE filehandles. (Steve Peters)

       Overloading and reblessing
	   Overloading now works when references are reblessed into another
	   class.  Internally, this has been implemented by moving the flag
	   for "overloading" from the reference to the referent, which
	   logically is where it should always have been. (Nicholas Clark)

       Overloading and UTF-8
	   A few bugs related to UTF-8 handling with objects that have
	   stringification overloaded have been fixed. (Nicholas Clark)

       eval memory leaks fixed
	   Traditionally, "eval 'syntax error'" has leaked badly. Many (but
	   not all) of these leaks have now been eliminated or reduced. (Dave
	   Mitchell)

       Random device on Windows
	   In previous versions, perl would read the file /dev/urandom if it
	   existed when seeding its random number generator.  That file is
	   unlikely to exist on Windows, and if it did would probably not
	   contain appropriate data, so perl no longer tries to read it on
	   Windows. (Alex Davies)

       PERLIO_DEBUG
	   The "PERLIO_DEBUG" environment variable no longer has any effect
	   for setuid scripts and for scripts run with -T.

	   Moreover, with a thread-enabled perl, using "PERLIO_DEBUG" could
	   lead to an internal buffer overflow. This has been fixed.

       PerlIO::scalar and read-only scalars
	   PerlIO::scalar will now prevent writing to read-only scalars.
	   Moreover, seek() is now supported with PerlIO::scalar-based
	   filehandles, the underlying string being zero-filled as needed.
	   (Rafael, Jarkko Hietaniemi)

       study() and UTF-8
	   study() never worked for UTF-8 strings, but could lead to false
	   results.  It's now a no-op on UTF-8 data. (Yves Orton)

       Critical signals
	   The signals SIGILL, SIGBUS and SIGSEGV are now always delivered in
	   an "unsafe" manner (contrary to other signals, that are deferred
	   until the perl interpreter reaches a reasonably stable state; see
	   "Deferred Signals (Safe Signals)" in perlipc). (Rafael)

       @INC-hook fix
	   When a module or a file is loaded through an @INC-hook, and when
	   this hook has set a filename entry in %INC, __FILE__ is now set for
	   this module accordingly to the contents of that %INC entry.
	   (Rafael)

       "-t" switch fix
	   The "-w" and "-t" switches can now be used together without messing
	   up which categories of warnings are activated. (Rafael)

       Duping UTF-8 filehandles
	   Duping a filehandle which has the ":utf8" PerlIO layer set will now
	   properly carry that layer on the duped filehandle. (Rafael)

       Localisation of hash elements
	   Localizing a hash element whose key was given as a variable didn't
	   work correctly if the variable was changed while the local() was in
	   effect (as in "local $h{$x}; ++$x"). (Bo Lindbergh)

New or Changed Diagnostics
       Use of uninitialized value
	   Perl will now try to tell you the name of the variable (if any)
	   that was undefined.

       Deprecated use of my() in false conditional
	   A new deprecation warning, Deprecated use of my() in false
	   conditional, has been added, to warn against the use of the dubious
	   and deprecated construct

	       my $x if 0;

	   See perldiag. Use "state" variables instead.

       !=~ should be !~
	   A new warning, "!=~ should be !~", is emitted to prevent this
	   misspelling of the non-matching operator.

       Newline in left-justified string
	   The warning Newline in left-justified string has been removed.

       Too late for "-T" option
	   The error Too late for "-T" option has been reformulated to be more
	   descriptive.

       "%s" variable %s masks earlier declaration
	   This warning is now emitted in more consistent cases; in short,
	   when one of the declarations involved is a "my" variable:

	       my $x;	my $x;	   # warns
	       my $x;  our $x;	   # warns
	       our $x;	my $x;	   # warns

	   On the other hand, the following:

	       our $x; our $x;

	   now gives a ""our" variable %s redeclared" warning.

       readdir()/closedir()/etc. attempted on invalid dirhandle
	   These new warnings are now emitted when a dirhandle is used but is
	   either closed or not really a dirhandle.

       Opening dirhandle/filehandle %s also as a file/directory
	   Two deprecation warnings have been added: (Rafael)

	       Opening dirhandle %s also as a file
	       Opening filehandle %s also as a directory

       Use of -P is deprecated
	   Perl's command-line switch "-P" is now deprecated.

       v-string in use/require is non-portable
	   Perl will warn you against potential backwards compatibility
	   problems with the "use VERSION" syntax.

       perl -V
	   "perl -V" has several improvements, making it more useable from
	   shell scripts to get the value of configuration variables. See
	   perlrun for details.

Changed Internals
       In general, the source code of perl has been refactored, tidied up, and
       optimized in many places. Also, memory management and allocation has
       been improved in several points.

       When compiling the perl core with gcc, as many gcc warning flags are
       turned on as is possible on the platform.  (This quest for cleanliness
       doesn't extend to XS code because we cannot guarantee the tidiness of
       code we didn't write.)  Similar strictness flags have been added or
       tightened for various other C compilers.

   Reordering of SVt_* constants
       The relative ordering of constants that define the various types of
       "SV" have changed; in particular, "SVt_PVGV" has been moved before
       "SVt_PVLV", "SVt_PVAV", "SVt_PVHV" and "SVt_PVCV".  This is unlikely to
       make any difference unless you have code that explicitly makes
       assumptions about that ordering. (The inheritance hierarchy of "B::*"
       objects has been changed to reflect this.)

   Elimination of SVt_PVBM
       Related to this, the internal type "SVt_PVBM" has been been removed.
       This dedicated type of "SV" was used by the "index" operator and parts
       of the regexp engine to facilitate fast Boyer-Moore matches. Its use
       internally has been replaced by "SV"s of type "SVt_PVGV".

   New type SVt_BIND
       A new type "SVt_BIND" has been added, in readiness for the project to
       implement Perl 6 on 5. There deliberately is no implementation yet, and
       they cannot yet be created or destroyed.

   Removal of CPP symbols
       The C preprocessor symbols "PERL_PM_APIVERSION" and
       "PERL_XS_APIVERSION", which were supposed to give the version number of
       the oldest perl binary-compatible (resp. source-compatible) with the
       present one, were not used, and sometimes had misleading values. They
       have been removed.

   Less space is used by ops
       The "BASEOP" structure now uses less space. The "op_seq" field has been
       removed and replaced by a single bit bit-field "op_opt". "op_type" is
       now 9 bits long. (Consequently, the "B::OP" class doesn't provide an
       "seq" method anymore.)

   New parser
       perl's parser is now generated by bison (it used to be generated by
       byacc.) As a result, it seems to be a bit more robust.

       Also, Dave Mitchell improved the lexer debugging output under "-DT".

   Use of "const"
       Andy Lester supplied many improvements to determine which function
       parameters and local variables could actually be declared "const" to
       the C compiler. Steve Peters provided new *_set macros and reworked the
       core to use these rather than assigning to macros in LVALUE context.

   Mathoms
       A new file, mathoms.c, has been added. It contains functions that are
       no longer used in the perl core, but that remain available for binary
       or source compatibility reasons. However, those functions will not be
       compiled in if you add "-DNO_MATHOMS" in the compiler flags.

   "AvFLAGS" has been removed
       The "AvFLAGS" macro has been removed.

   "av_*" changes
       The "av_*()" functions, used to manipulate arrays, no longer accept
       null "AV*" parameters.

   $^H and %^H
       The implementation of the special variables $^H and %^H has changed, to
       allow implementing lexical pragmas in pure Perl.

   B:: modules inheritance changed
       The inheritance hierarchy of "B::" modules has changed; "B::NV" now
       inherits from "B::SV" (it used to inherit from "B::IV").

   Anonymous hash and array constructors
       The anonymous hash and array constructors now take 1 op in the optree
       instead of 3, now that pp_anonhash and pp_anonlist return a reference
       to an hash/array when the op is flagged with OPf_SPECIAL. (Nicholas
       Clark)

Known Problems
       There's still a remaining problem in the implementation of the lexical
       $_: it doesn't work inside "/(?{...})/" blocks. (See the TODO test in
       t/op/mydef.t.)

       Stacked filetest operators won't work when the "filetest" pragma is in
       effect, because they rely on the stat() buffer "_" being populated, and
       filetest bypasses stat().

   UTF-8 problems
       The handling of Unicode still is unclean in several places, where it's
       dependent on whether a string is internally flagged as UTF-8. This will
       be made more consistent in perl 5.12, but that won't be possible
       without a certain amount of backwards incompatibility.

Platform Specific Problems
       When compiled with g++ and thread support on Linux, it's reported that
       the $! stops working correctly. This is related to the fact that the
       glibc provides two strerror_r(3) implementation, and perl selects the
       wrong one.

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://rt.perl.org/rt3/ .  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 analysed by
       the Perl porting team.

SEE ALSO
       The Changes file and the perl590delta to perl595delta man pages 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 v5.10.1			  2009-08-11		      PERL5100DELTA(1)
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