X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/0d314ba30623b19c36dfc97ac4b6ecb94cb406f4..be39acb2d731fef6f575d98c6fb0cf896ab8c72d:/pod/perldelta.pod

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index cf96a9b..5d8741c 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -5,15 +5,15 @@
 [ 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 v5.21.10
+perldelta - what is new for perl v5.21.11
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.21.9 release and the 5.21.10
+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 5.21.8, first read
-L<perl5219delta>, which describes differences between 5.21.8 and 5.21.9.
+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 Notice
 
@@ -49,9 +49,12 @@ XXX For a release on a stable branch, this section aspires to be:
 
 XXX Any deprecated features, syntax, modules etc. should be listed here.
 
-=head2 FATAL warnings are now discouraged
+=head2 Making all warnings fatal is discouraged
 
-Cautions against use of FATAL warnings have been strengthened.
+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.
 
 =head2 Module removals
 
@@ -93,12 +96,7 @@ There may well be none in a stable release.
 
 =item *
 
-The functions
-C<utf8::native_to_unicode()> and
-C<utf8::unicode_to_native()> (see L<utf8>)
-are now optimized out on ASCII platforms.
-There is now not even a minimal performance hit in writing code portable
-between ASCII and EBCDIC platforms.
+XXX
 
 =back
 
@@ -128,113 +126,74 @@ XXX
 
 =item *
 
-L<B> has been upgraded from version 1.56 to 1.57.
-
-=item *
-
-L<B::Deparse> has been upgraded from version 1.33 to 1.34.
-
-Deparse C<$#_> as that instead of as C<$#{_}>.  [perl #123947]
-
-=item *
-
-L<CPAN> has been upgraded from version 2.05 to 2.10.
-
-=over 4
-
-=item *
-
-Add support for C<Cwd::getdcwd()> and introduce workaround for a misbehaviour
-seen on Strawberry Perl 5.20.1.
-
-=item *
-
-Fix C<chdir()> after building dependencies bug.
+L<attributes> has been upgraded from version 0.26 to 0.27.
 
 =item *
 
-Introduce experimental support for plugins/hooks.
+L<B> has been upgraded from version 1.57 to 1.58.
 
 =item *
 
-Integrate the App::Cpan sources.
+L<B::Deparse> has been upgraded from version 1.34 to 1.35.
 
-=item *
-
-Do not check recursion on optional dependencies.
-
-=item *
-
-Sanity check META.yml to contain a hash.
-L<[cpan #95271]|https://rt.cpan.org/Ticket/Display.html?id=95271>
-
-=back
-
-=item *
-
-L<Data::Dumper> has been upgraded from version 2.157 to 2.158.
+C<< <<>> >> is now correctly deparsed.
 
 =item *
 
-L<DynaLoader> has been upgraded from version 1.31 to 1.32.
+L<Config::Perl::V> has been upgraded from version 0.23 to 0.24.
 
 =item *
 
-L<Encode> has been upgraded from version 2.70 to 2.72.
+L<Cwd> has been upgraded from version 3.55 to 3.56.
 
 =item *
 
-L<encoding> has been upgraded from version 2.13 to 2.14.
+L<ExtUtils::Miniperl> has been upgraded from version 1.04 to 1.05.
 
 =item *
 
-L<Getopt::Long> has been upgraded from version 2.43 to 2.45.
+L<ExtUtils::ParseXS> has been upgraded from version 3.27 to 3.28.
 
 =item *
 
-L<locale> has been upgraded from version 1.05 to 1.06.
+L<ExtUtils::Typemaps> has been upgraded from version 3.25 to 3.28.
 
 =item *
 
-L<Locale::Codes> has been upgraded from version 3.33 to 3.34.
+L<File::Spec> has been upgraded from version 3.55 to 3.56.
 
 =item *
 
-L<Module::CoreList> has been reverted from version 5.20150220 to 5.20150320.
-
-=item *
+L<if> has been upgraded from version 0.0603 to 0.0604.
 
-L<Pod::Functions> has been upgraded from version 1.08 to 1.09.
+The documentation now notes that this module also works with C<no>.
 
 =item *
 
-L<POSIX> has been upgraded from version 1.51 to 1.52.
+L<IO::Socket::IP> has been upgraded from version 0.36 to 0.37.
 
 =item *
 
-L<re> has been upgraded from version 0.31 to 0.32.
+L<Module::CoreList> has been upgraded from version 5.20150320 to 5.20150420.
 
-=item *
-
-L<Test::Simple> has been reverted from version 1.301001_098 to 1.001014.
+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<Text::Balanced> has been upgraded from version 2.02 to 2.03.
+L<perl5db.pl> has been upgraded from 1.48 to 1.49.
 
-No changes to installed files other than the version bump.
+The debugger would cause an assertion failure.  [perl #124127]
 
 =item *
 
-L<threads> has been upgraded from version 1.96_001 to 1.99.
+L<PerlIO::mmap> has been upgraded from version 0.013 to 0.014.
 
 =item *
 
-L<utf8> has been upgraded from version 1.14 to 1.15.
-
-=item *
+L<utf8> has been upgraded from version 1.15 to 1.16.
 
-L<XS::APItest> has been upgraded from version 0.70 to 0.71.
+Minor documentation update only.
 
 =item *
 
@@ -271,40 +230,79 @@ 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<perldata>
+=head3 L<perlebcdic>
 
 =over 4
 
 =item *
 
-Documentation has been added regarding the special floating point values C<Inf>
-and C<NaN>.
+This document has been significantly updated in the light of recent
+improvements to EBCDIC support.
 
 =back
 
-=head3 L<perlexperiment>
+=head3 L<perlfunc>
 
 =over 4
 
 =item *
 
-Removed note about C<\s> matching C<VT> now that it is no longer experimental.
+Mention that C<study()> is currently a no-op.
+
+=back
+
+=head3 L<perlguts>
+
+=over 4
+
+=item *
+
+The OOK example has been updated to account for COW changes and a change in the
+storage of the offset.
+
+=back
+
+=head3 L<perlhacktips>
+
+=over 4
+
+=item *
+
+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
+
+=head3 L<perlport>
+
+=over 4
+
+=item *
+
+Out-of-date VMS-specific information has been fixed/simplified.
+
+=back
+
+=head3 L<perluniintro>
+
+=over 4
 
 =item *
 
-Added note that C<use re 'strict'> has been introduced experimentally.
+Advice for how to make sure your strings and regular expression patterns are
+interpreted as Unicode has been revised to account for the new 5.22 EBCDIC
+handling.
 
 =back
 
-=head3 L<perlpolicy>
+=head3 L<perlvms>
 
 =over 4
 
 =item *
 
-The documentation of what to expect to see in future maintenance releases has
-been updated.  Essentially the same types of changes will be included as before
-but with fewer changes that don't affect the installation or execution of perl.
+Out-of-date and/or incorrect material has been removed.
 
 =back
 
@@ -328,12 +326,7 @@ and New Warnings
 
 =item *
 
-L<Invalid quantifier in {,} in regex; marked by <-- HERE in mE<sol>%sE<sol>|perldiag/"Invalid quantifier in {,} in regex; marked by <-- HERE in m/%s/">
-
-(F) The pattern looks like a {min,max} quantifier, but the min or max could not
-be parsed as a valid number - either it has leading zeroes, or it represents
-too big a number to cope with.  The S<<-- HERE> shows where in the regular
-expression the problem was discovered.  See L<perlre>.
+XXX L<message|perldiag/"message">
 
 =back
 
@@ -409,7 +402,10 @@ that they represent may be covered elsewhere.
 
 =item *
 
-Tests for performance issues have been added in the file F<t/perf/taint.t>.
+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
 
@@ -456,25 +452,73 @@ L</Modules and Pragmata> section.
 
 =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. [perl #123976]
+
+C<test-prep> again depends on C<test-prep-gcc> for GCC builds. [perl
+#124221]
 
 =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.
+=over 4
+
+=item *
 
-[ List each change as a =item entry ]
+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:
 
 =over 4
 
 =item *
 
-XXX
+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>.
+
+=item *
+
+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.
+
+=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 *
+
+Three new macros, C<OpMORESIB_set>, C<OpLASTSIB_set>, C<OpMAYBESIB_set>
+have been added, which are intended to be 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 *
+
+The macro C<OpSIBLING_set>, added in 5.21.2, has been removed. It didn't
+manipulate C<op_moresib> and has been superseded by C<OpMORESIB_set> et
+al.
+
+=item *
+
+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
 
@@ -489,9 +533,78 @@ files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
 
 =item *
 
-Repeated global pattern matches in scalar context on large tainted
-strings were exponentially slow depending on the current match
-position in the string. [perl #123202]
+C<pack("D", $x)> and C<pack("F", $x)> now zero the padding on x86 long
+double builds.  GCC 4.8 and later, under some build options, would
+either overwrite the zero-initialized padding, or bypass the
+initialized buffer entirely.  This caused F<op/pack.t> to fail.  [perl
+#123971]
+
+=item *
+
+Extending an array cloned from a parent thread could result in
+"Modification of a read-only value attempted" errors when attempting
+to modify the new elements. [perl #124127]
+
+=item *
+
+An assertion failure and subsequent crash with C<< *x=<y> >> has been fixed.
+[perl #123790]
+
+=item *
+
+An optimization for state variable initialization introduced in Perl 5.21.6 has
+been reverted because it was found to exacerbate some other existing buggy
+behaviour. [perl #124160]
+
+=item *
+
+The extension of another optimization to cover more ops in Perl 5.21 has also
+been reverted to its Perl 5.20 state as a temporary fix for regression issues
+that it caused. [perl #123790]
+
+=item *
+
+New bitwise ops added in Perl 5.21.9 accidentally caused C<$^H |= 0x1c020000>
+to enable all features.  This has now been fixed.
+
+=item *
+
+A possible crashing/looping bug has been fixed. [perl #124099]
+
+=item *
+
+UTF-8 variable names used in array indexes, unquoted UTF-8 HERE-document
+terminators and UTF-8 function names all now work correctly. [perl #124113]
+
+=item *
+
+Breakage in C<require(VERSION)> (with parentheses), introduced in Perl 5.21.6,
+has been fixed. [perl #124135]
+
+=item *
+
+Wide char warnings, wrongly raised in UTF-8 locales since Perl 5.21.8, are now
+suppressed. [perl #123527]
+
+=item *
+
+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>. [perl #124109]
+
+=item *
+
+A change introduced in Perl 5.21.10 that broke the autovivification CPAN module
+has been reverted.
+
+=item *
+
+A bug whereby C<< 'FOO'->f() >> lost the read-only status of C<FOO>, introduced
+in Perl 5.21.7, has been fixed. [perl #123619]
+
+=item *
+
+A regression in Perl 5.21 in the matching of C</[A-Z]/ai> has been fixed.
 
 =back
 
@@ -531,7 +644,7 @@ here.
 
 XXX Generate this with:
 
-  perl Porting/acknowledgements.pl v5.21.9..HEAD
+  perl Porting/acknowledgements.pl v5.21.10..HEAD
 
 =head1 Reporting Bugs