+=encoding utf8
+
=head1 NAME
perl5110delta - what is new for perl v5.11.0
=head1 Incompatible Changes
+=head2 Unicode interpretation of \w, \d, \s, and the POSIX character classes redefined.
+
+Previous versions of Perl tried to map POSIX style character class definitions onto
+Unicode property names so that patterns would "dwim" when matches were made against latin-1 or
+unicode strings. This proved to be a mistake, breaking character class negation, causing
+forward compatibility problems (as Unicode keeps updating their property definitions and adding
+new characters), and other problems.
+
+Therefore we have now defined a new set of artificial "unicode" property names which will be
+used to do unicode matching of patterns using POSIX style character classes and perl short-form
+escape character classes like \w and \d.
+
+The key change here is that \d will no longer match every digit in the unicode standard
+(there are thousands) nor will \w match every word character in the standard, instead they
+will match precisely their POSIX or Perl definition.
+
+Those needing to match based on Unicode properties can continue to do so by using the \p{} syntax
+to match whichever property they like, including the new artificial definitions.
+
+B<NOTE:> This is a backwards incompatible no-warning change in behaviour. If you are upgrading
+and you process large volumes of text look for POSIX and Perl style character classes and
+change them to the relevent property name (by removing the word 'Posix' from the current name).
+
+The following table maps the POSIX character class names, the escapes and the old and new
+Unicode property mappings:
+
+ POSIX Esc Class New-Property ! Old-Property
+ ----------------------------------------------+-------------
+ alnum [0-9A-Za-z] IsPosixAlnum ! IsAlnum
+ alpha [A-Za-z] IsPosixAlpha ! IsAlpha
+ ascii [\000-\177] IsASCII = IsASCII
+ blank [\011 ] IsPosixBlank !
+ cntrl [\0-\37\177] IsPosixCntrl ! IsCntrl
+ digit \d [0-9] IsPosixDigit ! IsDigit
+ graph [!-~] IsPosixGraph ! IsGraph
+ lower [a-z] IsPosixLower ! IsLower
+ print [ -~] IsPosixPrint ! IsPrint
+ punct [!-/:-@[-`{-~] IsPosixPunct ! IsPunct
+ space [\11-\15 ] IsPosixSpace ! IsSpace
+ \s [\11\12\14\15 ] IsPerlSpace ! IsSpacePerl
+ upper [A-Z] IsPosixUpper ! IsUpper
+ word \w [0-9A-Z_a-z] IsPerlWord ! IsWord
+ xdigit [0-9A-Fa-f] IsXDigit = IsXDigit
+
+If you wish to build perl with the old mapping you may do so by setting
+
+ #define PERL_LEGACY_UNICODE_CHARCLASS_MAPPINGS 1
+
+in regcomp.h, and then setting
+
+ PERL_TEST_LEGACY_POSIX_CC
+
+to true your enviornment when testing.
+
+
+=head2 @INC reorganization
+
+In @INC, ARCHLIB and PRIVLIB now occur after after the current version's
+site_perl and vendor_perl.
+
=head2 Switch statement changes
The handling of complex expressions by the C<given>/C<when> switch
-statement has been enhanced. There are two new cases where C<when> now
+statement has been enhanced. These enhancements are also available in
+5.10.1 and subsequent 5.10 releases. There are two new cases where C<when> now
interprets its argument as a boolean, instead of an expression to be used
in a smart match:
The next section details more changes brought to the semantics to
the smart match operator, that naturally also modify the behaviour
of the switch statements where smart matching is implicitly used.
+These changers were also made for the 5.10.1 release, and will remain in
+subsequent 5.10 releases.
=head2 Smart match changes
statements cannot be keywords anymore. This restriction will prevent
potential confusion between the C<goto LABEL> and C<goto EXPR> syntaxes:
for example, a statement like C<goto print> would jump to a label whose
-name would be the return value of print(), (usually 1), instead of a
+name would be the return value of C<print()>, (usually 1), instead of a
label named C<print>. Moreover, the other control flow statements
would just ignore any keyword passed to them as a label name. Since
such labels cannot be defined anymore, this kind of error will be
The internal structure of the C<ext/> directory in the perl source has
been reorganised. In general, a module C<Foo::Bar> whose source was
stored under F<ext/Foo/Bar/> is now located under F<ext/Foo-Bar/>. Also,
-some modules have been moved from F<lib/> to F<ext/>. This is purely a
-source tarball change, and should make no difference to the compilation or
-installation of perl, unless you have a very customised build process that
-explicitly relies on this structure, or which hard-codes the C<nonxs_ext>
-F<Configure> parameter. Specifically, this change does not by default
-alter the location of any files in the final installation.
+nearly all dual-life modules have been moved from F<lib/> to F<ext/>. This
+is purely a source tarball change, and should make no difference to the
+compilation or installation of perl, unless you have a very customised build
+process that explicitly relies on this structure, or which hard-codes the
+C<nonxs_ext> F<Configure> parameter. Specifically, this change does not by
+default alter the location of any files in the final installation.
=item *
# matches in 5.8.x, doesn't match in 5.10.0
$re = qr/^bar/; "foo\nbar" =~ /$re/m;
+=item *
+
+C<length undef> now returns undef.
+
+=item *
+
+Unsupported private C API functions are now declared "static" to prevent
+leakage to Perl's public API.
+
+=item *
+
+To support the bootstrapping process, F<miniperl> no longer builds with
+UTF-8 support in the regexp engine.
+
+This allows a build to complete with PERL_UNICODE set and a UTF-8 locale.
+Without this there's a bootstrapping problem, as miniperl can't load the UTF-8
+components of the regexp engine, because they're not yet built.
+
+=item *
+
+F<miniperl>'s @INC is now restricted to just -I..., the split of $ENV{PERL5LIB}, and "."
+
+=item *
+
+A space or a newline is now required after a C<"#line XXX"> directive.
+
+=item *
+
+Tied filehandles now have an additional method EOF which provides the EOF type
+
+=item *
+
+To better match all other flow control statements, C<foreach> may no longer be used as an attribute.
+
=back
=head1 Core Enhancements
=head2 Unicode Character Database 5.1.0
-The copy of the Unicode Character Database included in Perl 5.10.1 has
+The copy of the Unicode Character Database included in Perl 5.11.0 has
been updated to 5.1.0 from 5.0.0. See
L<http://www.unicode.org/versions/Unicode5.1.0/#Notable_Changes> for the
notable changes.
=head2 A proper interface for pluggable Method Resolution Orders
-As of Perl 5.10.1 there is a new interface for plugging and using method
+As of Perl 5.11.0 there is a new interface for plugging and using method
resolution orders other than the default (linear depth first search).
The C3 method resolution order added in 5.10.0 has been re-implemented as
a plugin, without changing its Perl-space interface. See L<perlmroapi> for
=head2 Support for C<configure_requires> in CPAN module metadata
Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> keyword
-in the C<META.yml> metadata file included in most recent CPAN distributions.
+in the F<META.yml> metadata file included in most recent CPAN distributions.
This allows distribution authors to specify configuration prerequisites that
must be installed before running F<Makefile.PL> or F<Build.PL>.
See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for more
on how to specify C<configure_requires> when creating a distribution for CPAN.
+=head2 C<each> is now more flexible
+
+The C<each> function can now operate on arrays.
+
+=head2 Y2038 compliance
+
+Perl's core time-related functions are now Y2038 compliant. (With 29
+years to spare!)
+
+=head2 C<$,> flexibility
+
+The variable C<$,> may now be tied.
+
+=head2 // in where clauses
+
+// now behaves like || in when clauses
+
+=head2 Enabling warnings from your shell environment
+
+You can now set C<-W> from the C<PERL5OPT> environment variable
+
+=head2 C<delete local>
+
+C<delete local> now allows you to locally delete a hash entry.
+
+=head2 New support for Abstract namespace sockets
+
+Abstract namespace sockets are Linux-specific socket type that live in
+AF_UNIX family, slightly abusing it to be able to use arbitrary
+character arrays as addresses: They start with nul byte and are not
+terminated by nul byte, but with the length passed to the socket()
+system call.
+
=head1 Modules and Pragmata
+=head2 Dual-lifed modules moved
+
+Dual-lifed modules maintained primarily in the Perl core now live in dist/.
+Dual-lifed modules maintained primarily on CPAN now live in cpan/
+
+In previous releases of Perl, it was customary to enumerate all module
+changes in this section of the C<perldelta> file. From 5.11.0 forward
+only notable updates (such as new or deprecated modules ) will be
+listed in this section. For a complete reference to the versions of
+modules shipped in a given release of perl, please see L<Module::CoreList>.
+
=head2 New Modules and Pragmata
=over 4
See L</"The C<overloading> pragma"> above.
-=item C<attributes>
-
-Upgraded from version 0.08 to 0.09.
-
=item C<attrs>
-Upgraded from version 1.02 to 1.03.
-
-=item C<base>
-
-Upgraded from version 2.13 to 2.14. See L<parent> for a replacement.
-
-=item C<bigint>
-
-Upgraded from version 0.22 to 0.23.
-
-=item C<bignum>
-
-Upgraded from version 0.22 to 0.23.
-
-=item C<bigrat>
-
-Upgraded from version 0.22 to 0.23.
+The C<attrs> pragma has been removed. It had been marked as deprecated since
+5.6.0.
=item C<charnames>
-Upgraded from version 1.06 to 1.07.
-
The Unicode F<NameAliases.txt> database file has been added. This has the
effect of adding some extra C<\N> character names that formerly wouldn't
have been recognised; for example, C<"\N{LATIN CAPITAL LETTER GHA}">.
-=item C<constant>
-
-Upgraded from version 1.13 to 1.17.
-
=item C<feature>
The meaning of the C<:5.10> and C<:5.10.X> feature bundles has
have identical effect. This is a change to the behaviour documented for
5.10.0.
-=item C<fields>
-
-Upgraded from version 2.13 to 2.14 (this was just a version bump; there
-were no functional changes).
-
-=item C<lib>
-
-Upgraded from version 0.5565 to 0.62.
-
-=item C<open>
-
-Upgraded from version 1.06 to 1.07.
-
-=item C<overload>
-
-Upgraded from version 1.06 to 1.07.
+=item C<mro>
-=item C<overloading>
-
-See L</"The C<overloading> pragma"> above.
-
-=item C<version>
+Upgraded from version 1.00 to 1.01. Performance for single inheritance is 40%
+faster - see L</"Performance Enhancements"> below.
-Upgraded from version 0.74 to 0.77.
+C<mro> is now implemented as an XS extension. The documented interface has not
+changed. Code relying on the implementation detail that some C<mro::>
+methods happened to be available at all times gets to "keep both pieces".
=back
=over 4
-=item C<Archive::Extract>
-
-Upgraded from version 0.24 to 0.34.
-
-=item C<Archive::Tar>
-
-Upgraded from version 1.38 to 1.52.
-
-=item C<Attribute::Handlers>
-
-Upgraded from version 0.79 to 0.85.
-
-=item C<AutoLoader>
-
-Upgraded from version 5.63 to 5.68.
-
-=item C<AutoSplit>
-
-Upgraded from version 1.05 to 1.06.
-
-=item C<B>
-
-Upgraded from version 1.17 to 1.22.
-
-=item C<B::Debug>
-
-Upgraded from version 1.05 to 1.11.
-
-=item C<B::Deparse>
-
-Upgraded from version 0.83 to 0.89.
-
-=item C<B::Lint>
-
-Upgraded from version 1.09 to 1.11.
-
-=item C<B::Xref>
-
-Upgraded from version 1.01 to 1.02.
-
-=item C<Benchmark>
-
-Upgraded from version 1.10 to 1.11.
-
-=item C<Carp>
-
-Upgraded from version 1.08 to 1.11.
-
-L<Carp> now includes all the necessary code to function. Previously, it
-used to be a lightweight placeholder that loaded the actual code from
-C<Carp::Heavy> on demand. C<Carp::Heavy> is now a simple, empty module
-kept for backwards compatibility for programs that used to pre-load it.
-
-
-=item C<CGI>
-
-Upgraded from version 3.29 to 3.43.
-(also includes the "default_value for popup_menu()" fix from 3.45).
-
-=item C<Compress::Zlib>
-
-Upgraded from version 2.008 to 2.020.
-
-=item C<CPAN>
-
-Upgraded from version 1.9205 to 1.9402. C<CPAN::FTP> has a local fix to
-stop it being too verbose on download failure.
-
-=item C<CPANPLUS>
-
-Upgraded from version 0.84 to 0.88.
-
-=item C<CPANPLUS::Dist::Build>
-
-Upgraded from version 0.06_02 to 0.36.
-
-=item C<Cwd>
-
-Upgraded from version 3.25_01 to 3.30.
-
-=item C<Data::Dumper>
-
-Upgraded from version 2.121_14 to 2.124.
-
-=item C<DB>
-
-Upgraded from version 1.01 to 1.02.
-
-=item C<DB_File>
-
-Upgraded from version 1.816_1 to 1.820.
-
-=item C<Devel::PPPort>
-
-Upgraded from version 3.13 to 3.19.
-
-=item C<Digest::MD5>
-
-Upgraded from version 2.36_01 to 2.39.
-
-=item C<Digest::SHA>
-
-Upgraded from version 5.45 to 5.47.
-
-=item C<DirHandle>
-
-Upgraded from version 1.01 to 1.03.
-
-=item C<Dumpvalue>
-
-Upgraded from version 1.12 to 1.13.
-
-=item C<DynaLoader>
-
-Upgraded from version 1.08 to 1.10.
-
-=item C<Encode>
-
-Upgraded from version 2.23 to 2.35.
-
-=item C<Errno>
-
-Upgraded from version 1.10 to 1.11.
-
-=item C<Exporter>
-
-Upgraded from version 5.62 to 5.63.
-
-=item C<ExtUtils::CBuilder>
-
-Upgraded from version 0.21 to 0.2602.
-
-=item C<ExtUtils::Command>
-
-Upgraded from version 1.13 to 1.16.
-
-=item C<ExtUtils::Constant>
-
-Upgraded from 0.20 to 0.22. (Note that neither of these versions are
-available on CPAN.)
-
-=item C<ExtUtils::Embed>
-
-Upgraded from version 1.27 to 1.28.
-
-=item C<ExtUtils::Install>
-
-Upgraded from version 1.44 to 1.54.
-
=item C<ExtUtils::MakeMaker>
Upgraded from version 6.42 to 6.55_02.
Note that C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish>
have been removed from this distribution.
-=item C<ExtUtils::Manifest>
-
-Upgraded from version 1.51_01 to 1.56.
-
-=item C<ExtUtils::ParseXS>
-
-Upgraded from version 2.18_02 to 2.2002.
-
-=item C<Fatal>
-
-Upgraded from version 1.05 to 2.06_01. See also the new pragma C<autodie>.
-
-=item C<File::Basename>
-
-Upgraded from version 2.76 to 2.77.
-
-=item C<File::Compare>
-
-Upgraded from version 1.1005 to 1.1006.
-
-=item C<File::Copy>
-
-Upgraded from version 2.11 to 2.14.
-
-=item C<File::Fetch>
-
-Upgraded from version 0.14 to 0.20.
-
-=item C<File::Find>
-
-Upgraded from version 1.12 to 1.14.
-
-=item C<File::Path>
-
-Upgraded from version 2.04 to 2.07_03.
-
-=item C<File::Spec>
-
-Upgraded from version 3.2501 to 3.30.
-
-=item C<File::stat>
-
-Upgraded from version 1.00 to 1.01.
-
-=item C<File::Temp>
-
-Upgraded from version 0.18 to 0.22.
-
-=item C<FileCache>
-
-Upgraded from version 1.07 to 1.08.
-
-=item C<FileHandle>
-
-Upgraded from version 2.01 to 2.02.
-
-=item C<Filter::Simple>
-
-Upgraded from version 0.82 to 0.84.
-
-=item C<Filter::Util::Call>
-
-Upgraded from version 1.07 to 1.08.
-
-=item C<FindBin>
-
-Upgraded from version 1.49 to 1.50.
-
-=item C<GDBM_File>
-
-Upgraded from version 1.08 to 1.09.
-
-=item C<Getopt::Long>
-
-Upgraded from version 2.37 to 2.38.
-
-=item C<Hash::Util::FieldHash>
-
-Upgraded from version 1.03 to 1.04. This fixes a memory leak.
-
-=item C<I18N::Collate>
-
-Upgraded from version 1.00 to 1.01.
-
-=item C<IO>
-
-Upgraded from version 1.23_01 to 1.25.
-
-This makes non-blocking mode work on Windows in C<IO::Socket::INET>
-[CPAN #43573].
-
-=item C<IO::Compress::*>
-
-Upgraded from version 2.008 to 2.020.
-
-=item C<IO::Dir>
-
-Upgraded from version 1.06 to 1.07.
-
-=item C<IO::Handle>
-
-Upgraded from version 1.27 to 1.28.
-
-=item C<IO::Socket>
-
-Upgraded from version 1.30_01 to 1.31.
-
-=item C<IO::Zlib>
-
-Upgraded from version 1.07 to 1.09.
-
-=item C<IPC::Cmd>
-
-Upgraded from version 0.40_1 to 0.46.
-
-=item C<IPC::Open3>
-
-Upgraded from version 1.02 to 1.04.
-
-=item C<IPC::SysV>
-
-Upgraded from version 1.05 to 2.01.
-
-=item C<lib>
-
-Upgraded from version 0.5565 to 0.62.
-
-=item C<List::Util>
-
-Upgraded from version 1.19 to 1.21.
-
-=item C<Locale::MakeText>
-
-Upgraded from version 1.12 to 1.13.
-
-=item C<Log::Message>
-
-Upgraded from version 0.01 to 0.02.
-
-=item C<Math::BigFloat>
-
-Upgraded from version 1.59 to 1.60.
-
-=item C<Math::BigInt>
-
-Upgraded from version 1.88 to 1.89.
-
-=item C<Math::BigInt::FastCalc>
-
-Upgraded from version 0.16 to 0.19.
-
-=item C<Math::BigRat>
-
-Upgraded from version 0.21 to 0.22.
-
-=item C<Math::Complex>
-
-Upgraded from version 1.37 to 1.56.
-
-=item C<Math::Trig>
-
-Upgraded from version 1.04 to 1.20.
-
-=item C<Memoize>
-
-Upgraded from version 1.01_02 to 1.01_03 (just a minor documentation
-change).
-
-=item C<Module::Build>
-
-Upgraded from version 0.2808_01 to 0.34_02.
-
-=item C<Module::CoreList>
-
-Upgraded from version 2.13 to 2.18. This release no longer contains the
-C<%Module::CoreList::patchlevel> hash.
-
-=item C<Module::Load>
-
-Upgraded from version 0.12 to 0.16.
-
-=item C<Module::Load::Conditional>
-
-Upgraded from version 0.22 to 0.30.
-
-=item C<Module::Loaded>
-
-Upgraded from version 0.01 to 0.02.
-
-=item C<Module::Pluggable>
-
-Upgraded from version 3.6 to 3.9.
-
-=item C<NDBM_File>
-
-Upgraded from version 1.07 to 1.08.
-
-=item C<Net::Ping>
-
-Upgraded from version 2.33 to 2.36.
-
-=item C<NEXT>
-
-Upgraded from version 0.60_01 to 0.64.
-
-=item C<Object::Accessor>
-
-Upgraded from version 0.32 to 0.34.
-
-=item C<OS2::REXX>
-
-Upgraded from version 1.03 to 1.04.
-
-=item C<Package::Constants>
-
-Upgraded from version 0.01 to 0.02.
-
-=item C<PerlIO>
-
-Upgraded from version 1.04 to 1.06.
-
-=item C<PerlIO::via>
-
-Upgraded from version 0.04 to 0.07.
-
-=item C<Pod::Man>
-
-Upgraded from version 2.16 to 2.22.
-
-=item C<Pod::Parser>
-
-Upgraded from version 1.35 to 1.37.
-
-=item C<Pod::Simple>
-
-Upgraded from version 3.05 to 3.07.
-
-=item C<Pod::Text>
-
-Upgraded from version 3.08 to 3.13.
-
-=item C<POSIX>
-
-Upgraded from version 1.13 to 1.17.
-
-=item C<Safe>
-
-Upgraded from 2.12 to 2.18.
-
-=item C<Scalar::Util>
-
-Upgraded from version 1.19 to 1.21.
-
-=item C<SelectSaver>
-
-Upgraded from 1.01 to 1.02.
-
-=item C<SelfLoader>
-
-Upgraded from 1.11 to 1.17.
-
-=item C<Socket>
-
-Upgraded from 1.80 to 1.82.
-
-=item C<Storable>
-
-Upgraded from 2.18 to 2.20.
-
-=item C<Switch>
-
-Upgraded from version 2.13 to 2.14. Please see L</Deprecations>.
-
-=item C<Symbol>
-
-Upgraded from version 1.06 to 1.07.
-
-=item C<Sys::Syslog>
-
-Upgraded from version 0.22 to 0.27.
-
-=item C<Term::ANSIColor>
-
-Upgraded from version 1.12 to 2.00.
-
-=item C<Term::ReadLine>
-
-Upgraded from version 1.03 to 1.04.
-
-=item C<Term::UI>
-
-Upgraded from version 0.18 to 0.20.
-
=item C<Test::Harness>
Upgraded from version 2.64 to 3.17.
removed. If you still need this, then they are available in the
(unmaintained) C<Test-Harness-Straps> distribution on CPAN.
-=item C<Test::Simple>
-
-Upgraded from version 0.72 to 0.92.
-
-=item C<Text::ParseWords>
-
-Upgraded from version 3.26 to 3.27.
-
-=item C<Text::Tabs>
-
-Upgraded from version 2007.1117 to 2009.0305.
-
-=item C<Text::Wrap>
-
-Upgraded from version 2006.1117 to 2009.0305.
-
-=item C<Thread::Queue>
-
-Upgraded from version 2.00 to 2.11.
-
-=item C<Thread::Semaphore>
-
-Upgraded from version 2.01 to 2.09.
-
-=item C<threads>
-
-Upgraded from version 1.67 to 1.72.
-
-=item C<threads::shared>
-
-Upgraded from version 1.14 to 1.29.
-
-=item C<Tie::RefHash>
-
-Upgraded from version 1.37 to 1.38.
-
-=item C<Tie::StdHandle>
-
-This has documentation changes, and has been assigned a version for the
-first time: version 4.2.
-
-=item C<Time::HiRes>
-
-Upgraded from version 1.9711 to 1.9719.
-
-=item C<Time::Local>
-
-Upgraded from version 1.18 to 1.1901.
-
-=item C<Time::Piece>
-
-Upgraded from version 1.12 to 1.15.
-
-=item C<Unicode::Normalize>
-
-Upgraded from version 1.02 to 1.03.
-
-=item C<Unicode::UCD>
-
-Upgraded from version 0.25 to 0.27.
-
-C<charinfo()> now works on Unified CJK code points added to later versions
-of Unicode.
-
-C<casefold()> has new fields returned to provide both a simpler interface
-and previously missing information. The old fields are retained for
-backwards compatibility. Information about Turkic-specific code points is
-now returned.
-
-The documentation has been corrected and expanded.
-
=item C<UNIVERSAL>
Upgraded from version 1.04 to 1.05.
-=item C<Win32>
-
-Upgraded from version 0.34 to 0.39.
-
-=item C<Win32API::File>
-
-Upgraded from version 0.1001_01 to 0.1101.
-
-=item C<XSLoader>
-
-Upgraded from version 0.08 to 0.10.
+C<< UNIVERSAL-E<gt>import() >> is now deprecated.
=back
The debugger now correctly handles proxy constant subroutines, and
subroutine stubs.
+=item F<perlbug>
+
+F<perlbug> now uses C<%Module::CoreList::bug_tracker> to print out upstream bug
+tracker URLs.
+
+Where the user names a module that their bug report is about, and we know the
+URL for its upstream bug tracker, provide a message to the user explaining
+that the core copies the CPAN version directly, and provide the URL for
+reporting the bug directly to upstream.
+
=item F<perlthanks>
-Perl 5.1
0.1 adds a new utility F<perlthanks>, which is a variant of
+Perl 5.1
1.0 added a new utility F<perlthanks>, which is a variant of
F<perlbug>, but for sending non-bug-reports to the authors and maintainers
of Perl. Getting nothing but bug reports can become a bit demoralising:
we'll see if this changes things.
This describes how to access the perl source using the I<git> version
control system.
-=item L<perlthanks>
-
-This describes the new F<perlthanks> utility.
-
=back
=head1 Changes to Existing Documentation
-The various large C<Changes*> files (which listed every change made to perl
+The various large F<Changes*> files (which listed every change made to perl
over the last 18 years) have been removed, and replaced by a small file,
-also called C<Changes>, which just explains how that same information may
+also called F<Changes>, which just explains how that same information may
be extracted from the git version control system.
The file F<Porting/patching.pod> has been deleted, as it mainly described
L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all
generated at build time, rather than being shipped as part of the release.
+=over
+
+=item *
+
+Documented -X overloading.
+
+=item *
+
+Documented that C<when()> treats specially most of the filetest operators
+
+=item *
+
+Documented when as a syntax modifier
+
+=item *
+
+Eliminated "Old Perl threads tutorial", which describes 5005 threads.
+
+F<pod/perlthrtut.pod> is the same material reworked for ithreads.
+
+=item *
+
+Correct previous documentation: v-strings are not deprecated
+
+With version objects, we need them to use MODULE VERSION syntax. This
+patch removes the deprecation note.
+
+=item *
+
+Added security contact information to L<perlsec>
+
+=back
+
=head1 Performance Enhancements
+
=over 4
=item *
=item *
+The implementation of C<C3> Method Resolution Order has been optimised -
+linearisation for classes with single inheritance is 40% faster. Performance
+for multiple inheritance is unchanged.
+
+=item *
+
Under C<use locale>, the locale-relevant information is now cached on
read-only values, such as the list returned by C<keys %hash>. This makes
operations such as C<sort keys %hash> in the scope of C<use locale> much
Empty C<DESTROY> methods are no longer called.
+=item *
+
+Faster C<Perl_sv_utf8_upgrade()>
+
+=item *
+
+Speed up C<keys> on empty hash
+
=back
=head1 Installation and Configuration Improvements
reported by C<%Config::Config> under the keys C<dynamic_ext>,
C<known_extensions>, C<nonxs_ext> and C<static_ext> have not changed, and
still use C</>. Hence this change will not have any affect once perl is
-installed. However, C<Attribute::Handlers>, C<Safe> and C<mro> have now
-become extensions in their own right, so if you run F<Configure> with
-options to specify an exact list of extensions to build, you will need to
-change it to account for this.
-
-For 5.10.2, it is planned that many dual-life modules will have been moved
-from F<lib> to F<ext>; again this will have no effect on an installed
-perl, but will matter if you invoke F<Configure> with a pre-canned list of
-extensions to build.
+installed. C<Safe> has been split out from being part of C<Opcode>, and
+C<mro> is now an extension in its own right.
+
+Nearly all dual-life modules have been moved from F<lib> to F<ext>, and will
+now appear as known C<nonxs_ext>. This will made no difference to the
+structure of an installed perl, nor will the modules installed differ,
+unless you run F<Configure> with options to specify an exact list of
+extensions to build. In this case, you will rapidly become aware that you
+need to add to your list, because various modules needed to complete the
+build, such as C<ExtUtils::ParseXS>, have now become extensions, and
+without them the build will fail well before it attempts to run the
+regression tests.
=head2 Configuration improvements
=item AIX
-Removed F<libbsd> for AIX 5L and 6.1. Only flock() was used from F<libbsd>.
+Removed F<libbsd> for AIX 5L and 6.1. Only C<flock()> was used from F<libbsd>.
Removed F<libgdbm> for AIX 5L and 6.1. The F<libgdbm> is delivered as an
-optional package with the AIX Toolbox. Unfortunately the 64 bit version
+optional package with the AIX Toolbox. Unfortunately the 64 bit version
is broken.
Hints changes mean that AIX 4.2 should work again.
behaviour in the cygwin.com build for years. The hints files have been
updated.
+=item DomainOS
+
+Support for Apollo DomainOS was removed in Perl 5.11.0
+
=item FreeBSD
The hints files now identify the correct threading libraries on FreeBSD 7
Patches from the Haiku maintainers have been merged in. Perl should now
build on Haiku.
+=item MachTen
+
+Support for Tenon Intersystems MachTen Unix layer for MacOS Classic was
+removed in Perl 5.11.0
+
+=item MiNT
+
+Support for Atari MiNT was removed in Perl 5.11.0.
+
=item MirOS BSD
Perl should now build on MirOS BSD.
shell and other utilities that depend on POSIX exit values. See
L<perlvms/"$?"> for details.
+C<File::Copy> now detects Unix compatibility mode on VMS.
+
=back
=head1 Selected Bug Fixes
=over 4
-=item
+=item *
-=item C<-I> on shebang line now adds directories in front of @INC.
+C<-I> on shebang line now adds directories in front of @INC
as documented, and as does C<-I> when specified on the command-line.
-(Renée Bäcker)
-=item
+=item *
-* C<kill> is now fatal when called on non-numeric process identifiers.
+C<kill> is now fatal when called on non-numeric process identifiers.
Previously, an 'undef' process identifier would be interpreted as a request to
kill process "0", which would terminate the current process group on POSIX
systems. Since process identifiers are always integers, killing a non-numeric
=item *
-C<crypt()> and string complement could return tainted values for untainted
+C<crypt> and string complement could return tainted values for untainted
arguments [RT #59998].
=item *
-The C<-i.suffix> command-line switch now recreates the file using
+The C<-i>I<.suffix> command-line switch now recreates the file using
restricted permissions, before changing its mode to match the original
file. This eliminates a potential race condition [RT #60904].
=item *
-On some UNIX systems, the value in C<$?> would not have the top bit set
+On some Unix systems, the value in C<$?> would not have the top bit set
(C<$? & 128>) even if the child core dumped.
=item *
-Under some circumstances, $^R could incorrectly become undefined
+Under some circumstances, C<$^R> could incorrectly become undefined
[RT #57042].
=item *
-(XS) In various hash functions, passing a pre-computed hash to when the
-key is UTF-8 might result in an incorrect lookup.
+In the XS API, various hash functions, when passed a pre-computed hash where
+the key is UTF-8, might result in an incorrect lookup.
=item *
-
(XS) Including F<XSUB.h> before F<perl.h> gave a compile-time error
+
XS code including F<XSUB.h> before F<perl.h> gave a compile-time error
[RT #57176].
=item *
-C<< $object->isa('Foo') >> would report false if the package C<Foo> didn't
+C<< $object-E<gt>isa('Foo') >> would report false if the package C<Foo> didn't
exist, even if the object's C<@ISA> contained C<Foo>.
=item *
=item *
-Using C<setpgrp()> with no arguments could corrupt the perl stack.
+Using C<setpgrp> with no arguments could corrupt the perl stack.
=item *
A 5.10.0 optimisation to clear the temporary stack within the implicit
loop of C<s///ge> has been reverted, as it turned out to be the cause of
-obscure bugs in seemingly unrelated parts of the interpreter [commit
+obscure bugs in seemingly unrelated parts of the interpreter [commit
ef0d4e17921ee3de].
=item *
=item *
-Calling C<sv_chop()> or otherwise upgrading an SV could result in an
+Calling C<Perl_sv_chop()> or otherwise upgrading an SV could result in an
unaligned 64-bit access on the SPARC architecture [RT #60574].
=item *
Assertion rx->sublen >= (s - rx->subbeg) + i failed
+=item *
+
+Previously missing files from Unicode 5.1 Character Database are now included.
+
+=item *
+
+C<TMPDIR> is now honored when opening an anonymous temporary file
=back
=item *
+TODO: C<SVt_RV> is gone. RVs are now stored in IVs
+
+=item *
+
+TODO: REGEXPs are first class
+
+=item *
+
+TODO: OOK is reworked, such that an OOKed scalar is PV not PVIV
+
+=item *
+
The J.R.R. Tolkien quotes at the head of C source file have been checked and
proper citations added, thanks to a patch from Tom Christiansen.
=item *
-C<vcroak()> now accepts a null first argument. In addition, a full audit
+C<Perl_vcroak()> now accepts a null first argument. In addition, a full audit
was made of the "not NULL" compiler annotations, and those for several
other internal functions were corrected.
=item C<SVs_TEMP>
-Call C<sv_2mortal()> on the new SV.
+Call C<Perl_sv_2mortal()> on the new SV.
=back
=item *
-C<Perl_mg_free()> used to leave freed memory accessible via SvMAGIC() on
+C<Perl_mg_free()> used to leave freed memory accessible via C<SvMAGIC()> on
the scalar. It now updates the linked list to remove each piece of magic
as it is freed.
=item *
+Smartmatch resolution tracing has been added as a new diagnostic. Use C<-DM> to
+enable it.
+
+
+=item *
+
+A new debugging flag C<-DB> now dumps subroutine definitions, leaving
+C<-Dx> for its original purpose of dumping syntax trees.
+
+=item *
+
Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have been
replaced by C<NULL> in the core code, and non-dual-life modules, as C<NULL>
is clearer to those unfamiliar with the core code.
=item *
-A new tool,
C<Porting/expand-macro.pl> has been added, that allows you
+A new tool,
F<Porting/expand-macro.pl> has been added, that allows you
to view how a C preprocessor macro would be expanded when compiled.
This is handy when trying to decode the macro hell that is the perl
guts.
Test the tied methods of C<Tie::Hash::NamedCapture>.
-=item t/op/reg_posixcc.t
+=item t/op/reg_posixcc.t
Check that POSIX character classes behave consistently.
Some regexes may run much more slowly when run in a child thread compared
with the thread the pattern was compiled into [RT #55600].
-
=back
=head1 Deprecations
=item *
-C<suidperl> will be removed in 5.12.0. This provides a mechanism to
+The following modules will be removed from the core distribution in a future
+release, and should be installed from CPAN instead. Distributions on CPAN
+which require these should add them to their prerequisites. The core versions
+of these modules warnings will issue a deprecation warning.
+
+=over
+
+=item *
+
+C<Class::ISA>
+
+=item *
+
+C<Pod::Plainer>
+
+=item *
+
+C<Shell>
+
+=back
+
+Currently support to install from CPAN without a I<force> is C<TODO> in CPAN
+and CPANPLUS. This will be addressed before 5.12.0 ships.
+
+=item *
+
+C<suidperl> has been removed. It used to provide a mechanism to
emulate setuid permission bits on systems that don't support it properly.
+=item *
+
+Deprecate assignment to $[
+
+=item *
+
+Remove attrs, which has been deprecated since 1999/10/02.
+
+=item *
+
+Deprecate use of the attribute :locked on subroutines.
+
+=item *
+
+Deprecate using "locked" with the attributes pragma.
+
+=item *
+
+Deprecate using "unique" with the attributes pragma.
+
+=item *
+
+warn if ++ or -- are unable to change the value because it's beyond the limit of representation
+
+This uses a new warnings category: "imprecision".
+
+=item *
+
+Make lc/uc/lcfirst/ucfirst warn when passed undef.
+
+=item *
+
+Show constant in "Useless use of a constant in void context"
+
+=item *
+
+Make the new warning report undef constants as undef
+
+=item *
+
+Add a new warning, "Prototype after '%s'"
+
+=item *
+
+Tweak the "Illegal character in prototype" warning so it's more precise when reporting illegal characters after _
+
+=item *
+
+Unintended interpolation of $\ in regex
+
+=item *
+
+Make overflow warnings in gmtime/localtime only occur when warnings are on
+
+=item *
+
+Improve mro merging error messages.
+
+They are now very similar to those produced by Algorithm::C3.
+
+=item *
+
+Amelioration of the error message "Unrecognized character %s in column %d"
+
+Changes the error message to "Unrecognized character %s; marked by E<lt>--
+HERE after %sE<lt>-- HERE near column %d". This should make it a little
+simpler to spot and correct the suspicious character.
+
+=item *
+
+Explicitely point to $. when it causes an uninitialized warning for ranges in scalar context
+
+
+=item *
+
+Deprecated numerous Perl 4-era libraries:
+
+F<termcap.pl>, F<tainted.pl>, F<stat.pl>, F<shellwords.pl>, F<pwd.pl>,
+F<open3.pl>, F<open2.pl>, F<newgetopt.pl>, F<look.pl>, F<find.pl>,
+F<finddepth.pl>, F<importenv.pl>, F<hostname.pl>, F<getopts.pl>,
+F<getopt.pl>, F<getcwd.pl>, F<flush.pl>, F<fastcwd.pl>, F<exceptions.pl>,
+F<ctime.pl>, F<complete.pl>, F<cacheout.pl>, F<bigrat.pl>, F<bigint.pl>,
+F<bigfloat.pl>, F<assert.pl>, F<abbrev.pl>, F<dotsh.pl>, and
+F<timelocal.pl> are all now deprecated. Using them will incur a warning.
+
=back
=head1 Acknowledgements
-Some of the work in this release was funded by a TPF grant.
-
-Nicholas Clark officially retired from maintenance pumpking duty at the
-end of 2008; however in reality he has put much effort in since then to
-help get 5.10.1 into a fit state to be released, including writing a
-considerable chunk of this perldelta.
+Some of the work in this release was funded by a TPF grant funded by
+Dijkmat BV, The Netherlands.
Steffen Mueller and David Golden in particular helped getting CPAN modules
polished and synchronised with their in-core equivalents.
The other core committers contributed most of the changes, and applied most
of the patches sent in by the hundreds of contributors listed in F<AUTHORS>.
+Much of the work of categorizing changes in this perldelta file was contributed
+by the following porters using changelogger.bestpractical.com:
+
+Nicholas Clark, leon, shawn, alexm, rjbs, rafl, Pedro Melo, brunorc,
+anonymous, ☄, Tom Hukins, anonymous, Jesse, dagolden, Moritz Onken,
+Mark Fowler, chorny, anonymous, tmtm
+
Finally, thanks to Larry Wall, without whom none of this would be
necessary.
The F<Artistic> and F<Copying> files for copyright information.
=cut
+
+
https://perl5.git.perl.org / perl5.git / blobdiff