=head1 NAME
-[ this is a template for a new perldelta file. Any text flagged as XXX needs
-to be processed before release. ]
-
-perldelta - what is new for perl v5.21.8
+perldelta - what is new for perl v5.21.11
=head1 DESCRIPTION
-This document describes differences between the 5.21.7 release and the 5.21.8
+This document describes differences between the 5.21.10 release and the 5.21.11
release.
-If you are upgrading from an earlier release such as 5.21.6, first read
-L<perl5217delta>, which describes differences between 5.21.6 and 5.21.7.
-
-=head1 Notice
-
-XXX Any important notices here
-
-=head1 Core Enhancements
-
-XXX New core language features go here. Summarize user-visible core language
-enhancements. Particularly prominent performance optimisations could go
-here, but most should go in the L</Performance Enhancements> section.
-
-[ List each enhancement as a =head2 entry ]
-
-=head2 The warnings pragma now supports warnings outside of "all"
-
-Ever since perl v5.6.0 we've had no way of adding new warnings without
-retroactively adding them to all existing programs that used C<-w>,
-C<-W> or C<use warnings>.
-
-This caused us to not add new useful warnings out of fear that they
-might unduly burden users who just wanted to upgrade perl and didn't
-want to deal with a bunch of warnings from their existing code.
-
-We now support a way to have our cake and eat it too, and can add new
-warnings to the core going forward through other top-level warning
-categories. See L<the warnings documentation|warnings/Top-level
-warning categories & associated confusion> for details.
-
-=head2 Non-Capturing Regular Expression Flag
-
-Regular expressions now support a C</n> flag that disables capturing
-and filling in C<$1>, C<$2>, etc... inside of groups:
-
- "hello" =~ /(hi|hello)/n; # $1 is not set
-
-This is equivalent to putting C<?:> at the beginning of every capturing group.
-
-See L<perlre/"n"> for more information.
+If you are upgrading from an earlier release such as 5.21.9, first read
+L<perl52110delta>, which describes differences between 5.21.9 and 5.21.10.
-=head1 Security
-
-XXX Any security-related notices go here. In particular, any security
-vulnerabilities closed should be noted here rather than in the
-L</Selected Bug Fixes> section.
-
-[ List each security issue as a =head2 entry ]
-
-=head1 Incompatible Changes
-
-XXX For a release on a stable branch, this section aspires to be:
+=head1 Deprecations
- There are no changes intentionally incompatible with 5.XXX.XXX
- If any exist, they are bugs, and we request that you submit a
- report. See L</Reporting Bugs> below.
+=head2 Making all warnings fatal is discouraged
-[ List each incompatible change as a =head2 entry ]
+The documentation for L<fatal warnings|warnings/Fatal Warnings> notes that
+C<< use warnings FATAL => 'all' >> is discouraged and provides stronger
+language about the risks of fatal warnings in general.
-=head1 Deprecations
+=head1 Modules and Pragmata
-XXX Any deprecated features, syntax, modules etc. should be listed here.
+=head2 Updated Modules and Pragmata
-=head2 Module removals
+=over 4
-XXX Remove this section if inapplicable.
+=item *
-The following modules will be removed from the core distribution in a
-future release, and will at that time need to be installed from CPAN.
-Distributions on CPAN which require these modules will need to list them as
-prerequisites.
+L<attributes> has been upgraded from version 0.26 to 0.27.
-The core versions of these modules will now issue C<"deprecated">-category
-warnings to alert you to this fact. To silence these deprecation warnings,
-install the modules in question from CPAN.
+=item *
-Note that these are (with rare exceptions) fine modules that you are encouraged
-to continue to use. Their disinclusion from core primarily hinges on their
-necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
-not usually on concerns over their design.
+L<B> has been upgraded from version 1.57 to 1.58.
-=over
+=item *
-=item XXX
+L<B::Deparse> has been upgraded from version 1.34 to 1.35.
-XXX Note that deprecated modules should be listed here even if they are listed
-as an updated module in the L</Modules and Pragmata> section.
+C<< <<>> >> is now correctly deparsed.
-=back
+=item *
-[ List each other deprecation as a =head2 entry ]
+L<Config::Perl::V> has been upgraded from version 0.23 to 0.24.
-=head1 Performance Enhancements
+=item *
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
+L<CPAN> has been upgraded from version 2.10 to 2.11.
-[ List each enhancement as a =item entry ]
+=item *
-=over 4
+L<Cwd> has been upgraded from version 3.55 to 3.56.
=item *
-XXX
+L<ExtUtils::Miniperl> has been upgraded from version 1.04 to 1.05.
-=back
+=item *
-=head1 Modules and Pragmata
+L<ExtUtils::ParseXS> has been upgraded from version 3.27 to 3.28.
-XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
-go here. If Module::CoreList is updated, generate an initial draft of the
-following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
-for important changes should then be added by hand. In an ideal world,
-dual-life modules would have a F<Changes> file that could be cribbed.
+=item *
-[ Within each section, list entries as a =item entry ]
+L<ExtUtils::Typemaps> has been upgraded from version 3.25 to 3.28.
-=head2 New Modules and Pragmata
+=item *
-=over 4
+L<File::Spec> has been upgraded from version 3.55 to 3.56.
=item *
-XXX
+L<if> has been upgraded from version 0.0603 to 0.0604.
-=back
+The documentation now notes that this module also works with C<no>.
-=head2 Updated Modules and Pragmata
+=item *
-=over 4
+L<IO::Socket::IP> has been upgraded from version 0.36 to 0.37.
=item *
-L<XXX> has been upgraded from version A.xx to B.yy.
+L<Module::CoreList> has been upgraded from version 5.20150320 to 5.20150420.
+
+Updated to cover the latest releases of Perl. Also fixes a fencepost error in
+is_core() and copes with versions that do not match x.yyyzzz.
=item *
-L<attributes> has been upgraded from version 0.24 to 0.25.
+L<perl5db.pl> has been upgraded from 1.48 to 1.49.
-Minor internal change only.
+The debugger would cause an assertion failure.
+L<[perl #124127]|https://rt.perl.org/Ticket/Display.html?id=124127>
=item *
-L<B> has been upgraded from version 1.54 to 1.55.
+L<PerlIO::mmap> has been upgraded from version 0.013 to 0.014.
-A bug where, after an ithread creation or psuedofork, special/immortal SVs in
-the child ithread/psuedoprocess did not have the correct class of
-C<B::SPECIAL>, has been fixed.
-
-=back
+=item *
-=head2 Removed Modules and Pragmata
+L<utf8> has been upgraded from version 1.15 to 1.16.
-=over 4
+Minor documentation update only.
=item *
-XXX
+L<warnings> has been upgraded from version 1.31 to 1.32.
=back
=head1 Documentation
-XXX Changes to files in F<pod/> go here. Consider grouping entries by
-file and be sure to link to the appropriate page, e.g. L<perlfunc>.
-
-=head2 New Documentation
-
-XXX Changes which create B<new> files in F<pod/> go here.
-
-=head3 L<XXX>
-
-XXX Description of the purpose of the new file here
-
=head2 Changes to Existing Documentation
-XXX Changes which significantly change existing files in F<pod/> go here.
-However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
-section.
-
-=head3 L<XXX>
+=head3 L<perlebcdic>
=over 4
=item *
-XXX Description of the change here
+This document has been significantly updated in the light of recent
+improvements to EBCDIC support.
=back
-=head1 Diagnostics
+=head3 L<perlfunc>
-The following additions or changes have been made to diagnostic output,
-including warnings and fatal error messages. For the complete list of
-diagnostic messages, see L<perldiag>.
+=over 4
-XXX New or changed warnings emitted by the core's C<C> code go here. Also
-include any changes in L<perldiag> that reconcile it to the C<C> code.
+=item *
-=head2 New Diagnostics
+Mention that C<study()> is currently a no-op.
-XXX Newly added diagnostic messages go under here, separated into New Errors
-and New Warnings
+=back
-=head3 New Errors
+=head3 L<perlguts>
=over 4
=item *
-XXX L<message|perldiag/"message">
+The OOK example has been updated to account for COW changes and a change in the
+storage of the offset.
=back
-=head3 New Warnings
+=head3 L<perlhacktips>
=over 4
=item *
-XXX L<message|perldiag/"message">
-
-=item *
-
-L<Wide character (U+%X) in %s|perldiag/"Wide character (U+%X) in %s">
+Documentation has been added illustrating the perils of assuming the contents
+of static memory pointed to by the return values of Perl wrappers for C library
+functions doesn't change.
=back
-=head2 Changes to Existing Diagnostics
-
-XXX Changes (i.e. rewording) of diagnostic messages go here
+=head3 L<perlport>
=over 4
=item *
-XXX Describe change here
-
-The message
-L<Locale '%s' may not work well.%s|perldiag/"Locale '%s' may not work well.%s">
-is no longer raised unless the problemtatic locale is actually used in
-the Perl program. Previously it was raised if it merely was the
-underlying locale. All Perl programs have an underlying locale at all
-times, but something like a C<S<use locale>> is needed for that locale
-to actually have some effect. This message will not be raised when
-the underlying locale is hidden.
+Out-of-date VMS-specific information has been fixed/simplified.
=back
-=head1 Utility Changes
-
-XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directory F<utils>.
-
-[ List utility changes as a =head2 entry for each utility and =item
-entries for each change
-Use L<XXX> with program names to get proper documentation linking. ]
-
-=head2 L<XXX>
+=head3 L<perluniintro>
=over 4
=item *
-XXX
+Advice for how to make sure your strings and regular expression patterns are
+interpreted as Unicode has been revised to account for the new Perl 5.22 EBCDIC
+handling.
=back
-=head1 Configuration and Compilation
-
-XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
-go here. Any other changes to the Perl build process should be listed here.
-However, any platform-specific changes should be listed in the
-L</Platform Support> section, instead.
-
-[ List changes as a =item entry ].
+=head3 L<perlvms>
=over 4
=item *
-XXX
+Out-of-date and/or incorrect material has been removed.
=back
=head1 Testing
-XXX Any significant changes to the testing of a freshly built perl should be
-listed here. Changes which create B<new> files in F<t/> go here as do any
-large changes to the testing harness (e.g. when parallel testing was added).
-Changes to existing files in F<t/> aren't worth summarizing, although the bugs
-that they represent may be covered elsewhere.
-
-[ List each test improvement as a =item entry ]
-
=over 4
=item *
-XXX
+F<t/porting/re_context.t> has been added to test that L<utf8> and its
+dependencies only use the subset of the C<$1..$n> capture vars that
+Perl_save_re_context() is hard-coded to localize, because that function has no
+efficient way of determining at runtime what vars to localize.
=back
=head1 Platform Support
-XXX Any changes to platform support should be listed in the sections below.
-
-[ Within the sections, list each platform as a =item entry with specific
-changes as paragraphs below it. ]
-
-=head2 New Platforms
-
-XXX List any platforms that this version of perl compiles on, that previous
-versions did not. These will either be enabled by new files in the F<hints/>
-directories, or new subdirectories and F<README> files at the top level of the
-source tree.
+=head2 Platform-Specific Notes
=over 4
-=item XXX-some-platform
+=item Win32
-XXX
+F<miniperl.exe> is now built with C<-fno-strict-aliasing>, allowing 64-bit
+builds to complete on GCC 4.8.
+L<[perl #123976]|https://rt.perl.org/Ticket/Display.html?id=123976>
-=back
+C<test-prep> again depends on C<test-prep-gcc> for GCC builds.
+L<[perl #124221]|https://rt.perl.org/Ticket/Display.html?id=124221>
-=head2 Discontinued Platforms
+=back
-XXX List any platforms that this version of perl no longer compiles on.
+=head1 Internal Changes
=over 4
-=item XXX-some-platform
+=item *
-XXX
+Perl 5.21.2 introduced a new build option, C<-DPERL_OP_PARENT>, which causes
+the last C<op_sibling> pointer to refer back to the parent rather than being
+C<NULL>, and where instead a new flag indicates the end of the chain. In this
+release, the new implementation has been revised; in particular:
-=back
+=over 4
-=head2 Platform-Specific Notes
+=item *
-XXX List any changes for specific platforms. This could include configuration
-and compilation changes or changes in portability/compatibility. However,
-changes within modules for platforms should generally be listed in the
-L</Modules and Pragmata> section.
+On C<PERL_OP_PARENT> builds, the C<op_sibling> field has been renamed
+C<op_sibparent> to reflect its new dual purpose. Since the intention is that
+this field should primarily be accessed via macros, this change should be
+transparent for code written to work under C<PERL_OP_PARENT>.
-=over 4
+=item *
-=item Win32
+The newly-introduced C<op_lastsib> flag bit has been renamed C<op_moresib> and
+its logic inverted; i.e. it is initialised to zero in a new op, and is changed
+to 1 when an op gains a sibling.
-=over 4
+=item *
+
+The function C<Perl_op_parent> is now only available on C<PERL_OP_PARENT>
+builds. Using it on a plain build will be a compile-timer error.
=item *
-Previously, on Visual C++ for Win64 built Perls only, when compiling every Perl
-XS module (including CPAN ones) and Perl aware .c file with a 64 bit Visual C++,
-would uncondtionally have around a dozen warnings from hv_func.h. These
-warnings have been silenced. GCC all bitness and Visual C++ for Win32 were
-not affected.
+Three new macros, C<OpMORESIB_set>, C<OpLASTSIB_set>, C<OpMAYBESIB_set> have
+been added, which are intended to be a low-level portable way to set
+C<op_sibling> / C<op_sibparent> while also updating C<op_moresib>. The first
+sets the sibling pointer to a new sibling, the second makes the op the last
+sibling, and the third conditionally does the first or second action. The
+C<op_sibling_splice()> function is retained as a higher-level interface that
+can also maintain consistency in the parent at the same time (e.g. by updating
+C<op_first> and C<op_last> where appropriate).
=item *
-Support for building without PerlIO has been removed from the Windows
-makefiles. Non-PerlIO builds were all but deprecated in Perl 5.18.0 and are
-already not supported by F<Configure> on POSIX systems.
+The macro C<OpSIBLING_set>, added in Perl 5.21.2, has been removed. It didn't
+manipulate C<op_moresib> and has been superseded by C<OpMORESIB_set> et al.
=item *
-Between 2 and 6 ms and 7 I/O calls have been saved per attempt to open a perl
-module for each path in C<@INC>.
+The C<op_sibling_splice> function now accepts a null C<parent> argument where
+the splicing doesn't affect the first or last ops in the sibling chain, and
+thus where the parent doesn't need to be updated accordingly.
=back
=back
-=head1 Internal Changes
-
-XXX Changes which affect the interface available to C<XS> code go here. Other
-significant internal changes for future core maintainers should be noted as
-well.
-
-[ List each change as a =item entry ]
+=head1 Selected Bug Fixes
=over 4
=item *
-Added Perl_sv_get_backrefs() to determine if an SV is a weak-referent.
-
-Function either returns an SV * of type AV, which contains the set of
-weakreferences which reference the passed in SV, or a simple RV * which
-is the only weakref to this item.
+C<pack("D", $x)> and C<pack("F", $x)> now zero the padding on x86 long double
+builds. GCC 4.8 and later, under some build options, would either overwrite
+the zero-initialized padding, or bypass the initialized buffer entirely. This
+caused F<op/pack.t> to fail.
+L<[perl #123971]|https://rt.perl.org/Ticket/Display.html?id=123971>
=item *
-C<gv_add_by_type> which was added to public API in 5.11.0 but undocumented and
-shows no CPAN usage has been removed from public API. Please use public API
-C<GvSVn> C<GvIOn> C<GvAVn> and C<GvHVn> for adding elements to a GV.
+Extending an array cloned from a parent thread could result in "Modification of
+a read-only value attempted" errors when attempting to modify the new elements.
+L<[perl #124127]|https://rt.perl.org/Ticket/Display.html?id=124127>
=item *
-C<GvSVn> C<GvIOn> C<GvAVn> and C<GvHVn> have been made rvalues, previously they
-were lvalues. If you are assigning a SV to C<GvSVn> C<GvIOn> C<GvAVn> and
-C<GvHVn> you are leaking memory. If you want an lvalue, use C<GvSV> C<GvIO>
-C<GvAV> and C<GvHV>.
+An assertion failure and subsequent crash with C<< *x=<y> >> has been fixed.
+L<[perl #123790]|https://rt.perl.org/Ticket/Display.html?id=123790>
=item *
-XXX
-
-=back
+An optimization for state variable initialization introduced in Perl 5.21.6 has
+been reverted because it was found to exacerbate some other existing buggy
+behaviour.
+L<[perl #124160]|https://rt.perl.org/Ticket/Display.html?id=124160>
-=head1 Selected Bug Fixes
+=item *
-XXX Important bug fixes in the core language are summarized here. Bug fixes in
-files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
+The extension of another optimization to cover more ops in Perl 5.21 has also
+been reverted to its Perl 5.20 state as a temporary fix for regression issues
+that it caused.
+L<[perl #123790]|https://rt.perl.org/Ticket/Display.html?id=123790>
-[ List each fix as a =item entry ]
+=item *
-=over 4
+New bitwise ops added in Perl 5.21.9 accidentally caused C<$^H |= 0x1c020000>
+to enable all features. This has now been fixed.
=item *
-A bug in regular expression patterns that could lead to segfaults and
-other crashes has been fixed. This occurred only in patterns compiled
-with C<"/i">, while taking into account the current POSIX locale (this usually
-means they have to be compiled within the scope of C<S<"use locale">>),
-and there must be a string of at least 128 consecutive bytes to match.
-[perl #123539]
+A possible crashing/looping bug has been fixed.
+L<[perl #124099]|https://rt.perl.org/Ticket/Display.html?id=124099>
-=back
+=item *
-=head1 Known Problems
+UTF-8 variable names used in array indexes, unquoted UTF-8 HERE-document
+terminators and UTF-8 function names all now work correctly.
+L<[perl #124113]|https://rt.perl.org/Ticket/Display.html?id=124113>
-XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
-tests that had to be C<TODO>ed for the release would be noted here. Unfixed
-platform specific bugs also go here.
+=item *
-[ List each fix as a =item entry ]
+Breakage in C<require(VERSION)> (with parentheses), introduced in Perl 5.21.6,
+has been fixed.
+L<[perl #124135]|https://rt.perl.org/Ticket/Display.html?id=124135>
-=over 4
+=item *
+
+Wide char warnings, wrongly raised in UTF-8 locales since Perl 5.21.8, are now
+suppressed.
+L<[perl #123527]|https://rt.perl.org/Ticket/Display.html?id=123527>
=item *
-XXX
+A subtle bug introduced in Perl 5.21.4 involving UTF-8 in regular expressions
+and sometimes causing a crash has been fixed. A new test script has been added
+to test this fix; see under L</Testing>.
+L<[perl #124109]|https://rt.perl.org/Ticket/Display.html?id=124109>
-=back
+=item *
-=head1 Errata From Previous Releases
+A change introduced in Perl 5.21.10 that broke the autovivification CPAN module
+has been reverted.
-=over 4
+=item *
+
+A bug whereby C<< 'FOO'->f() >> lost the read-only status of C<FOO>, introduced
+in Perl 5.21.7, has been fixed.
+L<[perl #123619]|https://rt.perl.org/Ticket/Display.html?id=123619>
=item *
-XXX Add anything here that we forgot to add, or were mistaken about, in
-the perldelta of a previous release.
+A regression in Perl 5.21 in the matching of C</[A-Z]/ai> has been fixed.
=back
-=head1 Obituary
+=head1 Acknowledgements
-XXX If any significant core contributor has died, we've added a short obituary
-here.
+Perl 5.21.11 represents approximately 4 weeks of development since Perl 5.21.10
+and contains approximately 5,800 lines of changes across 240 files from 24
+authors.
-=head1 Acknowledgements
+Excluding auto-generated files, documentation and release tools, there were
+approximately 1,700 lines of changes to 160 .pm, .t, .c and .h files.
+
+Perl continues to flourish into its third decade thanks to a vibrant community
+of users and developers. The following people are known to have contributed
+the improvements that became Perl 5.21.11:
+
+Alex Vandiver, Andreas König, Craig A. Berry, Dagfinn Ilmari Mannsåker, Daniel
+Dragan, David Golden, David Mitchell, Father Chrysostomos, H.Merijn Brand,
+Herbert Breunung, Hugo van der Sanden, James E Keenan, James McCoy, Karl
+Williamson, Matthew Horsfall, Max Maischein, Nicholas Clark, Rafael
+Garcia-Suarez, Randy Stauner, Ricardo Signes, Shirakata Kentaro, Steffen
+Müller, Steve Hay, Tony Cook.
+
+The list above is almost certainly incomplete as it is automatically generated
+from version control history. In particular, it does not include the names of
+the (very much appreciated) contributors who reported issues to the Perl bug
+tracker.
-XXX Generate this with:
+Many of the changes included in this version originated in the CPAN modules
+included in Perl's core. We're grateful to the entire CPAN community for
+helping Perl to flourish.
- perl Porting/acknowledgements.pl v5.21.7..HEAD
+For a more complete list of all of Perl's historical contributors, please see
+the F<AUTHORS> file in the Perl source distribution.
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff