--- /dev/null
+=encoding utf8
+
+=head1 NAME
+
+perl5238delta - what is new for perl v5.23.8
+
+=head1 DESCRIPTION
+
+This document describes differences between the 5.23.7 release and the 5.23.8
+release.
+
+If you are upgrading from an earlier release such as 5.23.6, first read
+L<perl5237delta>, which describes differences between 5.23.6 and 5.23.7.
+
+=head1 Core Enhancements
+
+=head2 More fields provided to C<sigaction> callback with C<SA_SIGINFO>
+
+When passing the C<SA_SIGINFO> flag to L<sigaction|POSIX/sigaction>, the
+C<errno>, C<status>, C<uid>, C<pid>, C<addr> and C<band> fields are now
+included in the hash passed to the handler, if supported by the
+platform.
+
+=head1 Security
+
+=head2 Set proper umask before calling C<mkstemp(3)>
+
+In 5.22 perl started setting umask to 0600 before calling C<mkstemp(3)>
+and restoring it afterwards. This wrongfully tells open(2) to strip
+the owner read and write bits from the given mode before applying it,
+rather than the intended negation of leaving only those bits in place.
+
+Systems that use mode 0666 in C<mkstemp(3)> (like old versions of
+glibc) create a file with permissions 0066, leaving world read and
+write permissions regardless of current umask.
+
+This has been fixed by using umask 0177 instead. [perl #127322]
+
+=head1 Incompatible Changes
+
+=head2 C<qr/\N{}/> now disallowed under C<use re "strict">
+
+An empty C<\N{}> makes no sense, but for backwards compatibility is
+silently accepted as doing nothing. But now this is a fatal error under
+the experimental feature L<re/'strict' mode>.
+
+=head1 Performance Enhancements
+
+=over 4
+
+=item *
+
+The overhead of scope entry and exit has been considerably reduced, so
+for example subroutine calls, loops and basic blocks are all faster now.
+This empty function call now takes about a third less time to execute:
+
+ sub f{} f();
+
+=item *
+
+On Win32, C<stat>ing or C<-X>ing a path, if the file or directory does not
+exist, is now 3.5x faster on a SSD (or any drive) than before.
+
+=back
+
+=head1 Modules and Pragmata
+
+=head2 Updated Modules and Pragmata
+
+=over 4
+
+=item *
+
+F<cpan/podlators/> has been upgraded from version 4.04 to 4.06.
+
+=item *
+
+The PathTools module collection has been upgraded from version 3.62
+to 3.63.
+
+=item *
+
+L<DynaLoader> has been upgraded from version 1.37 to 1.38.
+
+DynaLoader now always looks for bootstrap files having the same base name as
+the module for which the bootstrap code is being run. Previously, and only on
+platforms that use C<mod2fname> to produce unique loadable library names,
+L<DynaLoader> would look for the bootstrap file using a base name that matched
+the loadable library and not find it.
+
+=item *
+
+L<Encode> has been upgraded from version 2.78 to 2.80.
+
+=item *
+
+L<ExtUtils::CBuilder> has been upgraded from version 0.280224 to 0.280225.
+
+=item *
+
+L<ExtUtils::MakeMaker> has been upgraded from version 7.10 to 7.10_01.
+
+=item *
+
+L<File::Spec> has been upgraded from version 3.62 to 3.63.
+
+=item *
+
+L<IPC::SysV> has been upgraded from version 2.04 to 2.05.
+
+=item *
+
+L<Module::CoreList> has been upgraded from version 5.20160120 to 5.20160121.
+
+=item *
+
+L<ODBM_File> has been upgraded from version 1.12 to 1.13.
+
+=item *
+
+L<PerlIO::encoding> has been upgraded from version 0.23 to 0.24.
+
+=item *
+
+L<POSIX> has been upgraded from version 1.59 to 1.63.
+
+It can now export constants for the C<code> value in the hash passed to the
+L<sigaction|POSIX/sigaction> handler when using the C<SA_SIGINFO> flag.
+
+These previously deprecated functions are now removed: C<isalnum>,
+C<isalpha>, C<iscntrl>, C<isdigit>, C<isgraph>, C<islower>, C<isprint>,
+C<ispunct>, C<isspace>, C<isupper>, and C<isxdigit>.
+
+=item *
+
+L<Storable> has been upgraded from version 2.54 to 2.55.
+
+=item *
+
+L<Time::HiRes> has been upgraded from version 1.9728 to 1.9730.
+
+It can now export Linux-specific and FreeBSD-specific C<clock_gettime()>
+constants. It also now has emulation for OS X C<clock_nanosleep()>,
+C<clock_gettime()>, and C<clock_getres()>.
+
+=back
+
+=head1 Documentation
+
+=head2 Changes to Existing Documentation
+
+=head3 L<perlguts>
+
+=over 4
+
+=item *
+
+A new section has been added, L<perlguts/"Dynamic Scope and the Context
+Stack">, which explains how the perl context stack works.
+
+=back
+
+=head3 L<perlmodlib>
+
+=over 4
+
+=item *
+
+We now recommend contacting the module-authors list or PAUSE in seeking
+guidance on the naming of modules.
+
+=back
+
+=head1 Diagnostics
+
+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>.
+
+=head2 New Diagnostics
+
+=head3 New Errors
+
+=over 4
+
+=item *
+
+L<<< Sequence (?PE<lt>... not terminated in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>
+|perldiag/"Sequence (?PE<lt>... not terminated in regex; marked by <-- HERE in mE<sol>%sE<sol>" >>>
+
+=item *
+
+L<Sequence (?PE<gt>... not terminated in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>
+|perldiag/"Sequence (?PE<gt>... not terminated in regex; marked by <-- HERE in mE<sol>%sE<sol>">
+
+=item *
+
+L<Empty \%c in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>
+|perldiag/"Empty \%c in regex; marked by <-- HERE in mE<sol>%sE<sol>">
+
+=back
+
+=head3 New Warnings
+
+=over 4
+
+=item *
+
+L<Assuming NOT a POSIX class since %s in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|
+perldiag/Assuming NOT a POSIX class since %s in regex; marked by <-- HERE in mE<sol>%sE<sol>>
+
+=back
+
+=head1 Configuration and Compilation
+
+=over 4
+
+=item *
+
+The GNU Make makefile for Win32 now supports parallel builds. [perl #126632]
+
+=item *
+
+You can now build perl with MSVC++ on Win32 using GNU Make. [perl #126632]
+
+=item *
+
+Bison 3.0 is now supported.
+
+=back
+
+=head1 Platform Support
+
+=head2 Platform-Specific Notes
+
+=over 4
+
+=item VMS
+
+=over
+
+=item *
+
+For those C<%ENV> elements based on the CRTL environ array, we've always
+preserved case when setting them but did look-ups only after upcasing the
+key first, which made lower- or mixed-case entries go missing. This problem
+has been corrected by making C<%ENV> elements derived from the environ array
+case-sensitive on look-up as well as case-preserving on store.
+
+=item *
+
+Environment look-ups for C<PERL5LIB> and C<PERLLIB> previously only
+considered logical names, but now consider all sources of C<%ENV> as
+determined by C<PERL_ENV_TABLES> and as documented in L<perlvms/%ENV>.
+
+=back
+
+=item Win32
+
+Builds using Microsoft Visual C++ 2003 and earlier no longer produce
+an "INTERNAL COMPILER ERROR" message. [perl #126045]
+
+=back
+
+=head1 Internal Changes
+
+=over 4
+
+=item *
+
+The implementation of perl's context stack system, and its internal API,
+have been heavily reworked. Note that no significant changes have been
+made to any external APIs, but XS code which relies on such internal
+details may need to be fixed. The main changes are:
+
+=over 4
+
+=item *
+
+The C<PUSHBLOCK()>, C<POPSUB()> etc. macros have been replaced with static
+inline functions such as C<cx_pushblock()>, C<cx_popsub()> etc. These use
+function args rather than implicitly relying on local vars such as
+C<gimme> and C<newsp> being available. Also their functionality has
+changed: in particular, C<cx_popblock()> no longer decrements
+C<cxstack_ix>. The ordering of the steps in the C<pp_leave*> functions
+involving C<cx_popblock()>, C<cx_popsub()> etc. has changed. See the new
+documentation, L<perlguts/"Dynamic Scope and the Context Stack">, for
+details on how to use them.
+
+=item *
+
+Various macros, which now consistently have a CX_ prefix, have been added:
+
+ CX_CUR(), CX_LEAVE_SCOPE(), CX_POP()
+
+or renamed:
+
+ CX_POP_SAVEARRAY(), CX_DEBUG(), CX_PUSHSUBST(), CX_POPSUBST()
+
+=item *
+
+C<cx_pushblock()> now saves C<PL_savestack_ix> and C<PL_tmps_floor>, so
+C<pp_enter*> and C<pp_leave*> no longer do
+
+ ENTER; SAVETMPS; ....; LEAVE
+
+=item *
+
+C<cx_popblock()> now also restores C<PL_curpm>.
+
+=item *
+
+In C<dounwind()> for every context type, the current savestack frame is
+now processed before each context is popped; formerly this was only done
+for sub-like context frames. This action has been removed from
+C<cx_popsub()> and placed into its own macro, C<CX_LEAVE_SCOPE(cx)>, which
+must be called before C<cx_popsub()> etc.
+
+C<dounwind()> now also does a C<cx_popblock()> on the last popped frame
+(formerly it only did the C<cx_popsub()> etc. actions on each frame).
+
+=item *
+
+The temps stack is now freed on scope exit; previously, temps created
+during the last statement of a block wouldn't be freed until the next
+C<nextstate> following the block (apart from an existing hack that did
+this for recursive subs in scalar context); and in something like
+C<f(g())>, the temps created by the last statement in C<g()> would
+formerly not be freed until the statement following the return from
+C<f()>.
+
+=item *
+
+Most values that were saved on the savestack on scope entry are now
+saved in suitable new fields in the context struct, and saved and
+restored directly by C<cx_pushfoo()> and C<cx_popfoo()>, which is much
+faster.
+
+=item *
+
+Various context struct fields have been added, removed or modified.
+
+=item *
+
+The handling of C<@_> in C<cx_pushsub()> and C<cx_popsub()> has been
+considerably tidied up, including removing the C<argarray> field from the
+context struct, and extracting out some common (but rarely used) code into
+a separate function, C<clear_defarray()>. Also, useful subsets of
+C<cx_popsub()> which had been unrolled in places like C<pp_goto> have been
+gathered into the new functions C<cx_popsub_args()> and
+C<cx_popsub_common()>.
+
+=item *
+
+C<pp_leavesub> and C<pp_leavesublv> now use the same function as the rest
+of the C<pp_leave*>'s to process return args.
+
+=item *
+
+C<CXp_FOR_PAD> and C<CXp_FOR_GV> flags have been added, and
+C<CXt_LOOP_FOR> has been split into C<CXt_LOOP_LIST>, C<CXt_LOOP_ARY>.
+
+=item *
+
+Some variables formerly declared by C<dMULTICALL> (but not documented) have
+been removed.
+
+=back
+
+=back
+
+=head1 Selected Bug Fixes
+
+=over 4
+
+=item *
+
+Line numbers larger than 2**31-1 but less than 2**32 are no longer
+returned by caller() as negative numbers. [perl #126991]
+
+=item *
+
+C<< unless ( I<assignment> ) >> now properly warns when syntax
+warnings are enabled. [perl #127122]
+
+=item *
+
+Setting an C<ISA> glob to an array reference now properly adds
+C<isaelem> magic to any existing elements. Previously modifying such
+an element would not update the ISA cache, so method calls would call
+the wrong function. Perl would also crash if the C<ISA> glob was
+destroyed, since new code added in 5.23.7 would try to release the
+C<isaelem> magic from the elements. [perl #127351]
+
+=item *
+
+If a here-doc was found while parsing another operator, the parser had
+already read end of file, and the here-doc was not terminated, perl
+could produce an assertion or a segmentation fault. This now reliably
+complains about the unterminated here-doc. [perl #125540]
+
+=item *
+
+untie() would sometimes return the last value returned by the UNTIE()
+handler as well as it's normal value, messing up the stack. [perl
+#126621]
+
+=item *
+
+Fixed an operator precedence problem when C< castflags & 2> is true.
+[perl #127474]
+
+=item *
+
+Caching of DESTROY methods could result in a non-pointer or a
+non-STASH stored in the SvSTASH() slot of a stash, breaking the B
+STASH() method. The DESTROY method is now cached in the MRO metadata
+for the stash. [perl #126410]
+
+=item *
+
+The AUTOLOAD method is now called when searching for a DESTROY method,
+and correctly sets C<$AUTOLOAD> too. [perl #124387] [perl #127494]
+
+=item *
+
+Avoid parsing beyond the end of the buffer when processing a C<#line>
+directive with no filename. [perl #127334]
+
+=item *
+
+Perl now raises a warning when a regular expression pattern looks like
+it was supposed to contain a POSIX class, like C<qr/[[:alpha:]]/>, but
+there was some slight defect in its specification which causes it to
+instead be treated as a regular bracketed character class. An example
+would be missing the second colon in the above like this:
+C<qr/[[:alpha]]/>. This compiles to match a sequence of two characters.
+The second is C<"]">, and the first is any of: C<"[">, C<":">, C<"a">,
+C<"h">, C<"l">, or C<"p">. This is unlikely to be the intended
+meaning, and now a warning is raised. No warning is raised unless the
+specification is very close to one of the 14 legal POSIX classes. (See
+L<perlrecharclass/POSIX Character Classes>.)
+[perl #8904]
+
+=item *
+
+Certain regex patterns involving a complemented POSIX class in an
+inverted bracketed character class, and matching something else
+optionally would improperly fail to match. An example of one that could
+fail is C</qr/_?[^\Wbar]\x{100}/>. This has been fixed.
+[perl #127537]
+
+=item *
+
+Perl 5.22 added support to the C99 hexadecimal floating point notation,
+but sometimes misparses hex floats. This had been fixed.
+[perl #127183]
+
+=back
+
+=head1 Acknowledgements
+
+Perl 5.23.8 represents approximately 4 weeks of development since Perl 5.23.7
+and contains approximately 30,000 lines of changes across 350 files from 23
+authors.
+
+Excluding auto-generated files, documentation and release tools, there were
+approximately 14,000 lines of changes to 210 .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 5.23.8:
+
+Aaron Crane, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari
+Mannsåker, Daniel Dragan, David Mitchell, Ed J, Herbert Breunung, H.Merijn
+Brand, James E Keenan, Jarkko Hietaniemi, Karl Williamson, Lukas Mai, Niko
+Tyni, Pip Cet, Ricardo Signes, Sawyer X, Sisyphus, Stevan Little, Steve Hay,
+Todd Rinaldo, Tom Hukins, 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.
+
+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.
+
+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
+
+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
+L<https://rt.perl.org/> . There may also be information at
+L<http://www.perl.org/> , the Perl Home Page.
+
+If you believe you have an unreported bug, please run the L<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 C<perl -V>,
+will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
+
+If the bug you are reporting has security implications, which make it
+inappropriate to send to a publicly archived mailing list, then please send it
+to perl5-security-report@perl.org. This points to a closed subscription
+unarchived mailing list, which includes all the core committers, who will be
+able to help assess the impact of issues, figure out a resolution, and help
+co-ordinate the release of patches to mitigate or fix the problem across all
+platforms on which Perl is supported. Please only use this address for
+security issues in the Perl core, not for modules independently distributed on
+CPAN.
+
+=head1 SEE ALSO
+
+The F<Changes> file for an explanation of how to view exhaustive details on
+what changed.
+
+The F<INSTALL> file for how to build Perl.
+
+The F<README> file for general stuff.
+
+The F<Artistic> and F<Copying> files for copyright information.
+
+=cut
=head1 NAME
-perldelta - what is new for perl v5.23.8
+[ 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 v5.23.9
=head1 DESCRIPTION
-This document describes differences between the 5.23.7 release and the 5.23.8
+This document describes differences between the 5.23.8 release and the 5.23.9
release.
-If you are upgrading from an earlier release such as 5.23.6, first read
-L<perl5237delta>, which describes differences between 5.23.6 and 5.23.7.
+If you are upgrading from an earlier release such as 5.23.7, first read
+L<perl5238delta>, which describes differences between 5.23.7 and 5.23.8.
-=head1 Core Enhancements
+=head1 Notice
-=head2 More fields provided to C<sigaction> callback with C<SA_SIGINFO>
+XXX Any important notices here
-When passing the C<SA_SIGINFO> flag to L<sigaction|POSIX/sigaction>, the
-C<errno>, C<status>, C<uid>, C<pid>, C<addr> and C<band> fields are now
-included in the hash passed to the handler, if supported by the
-platform.
+=head1 Core Enhancements
-=head1 Security
+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.
-=head2 Set proper umask before calling C<mkstemp(3)>
+[ List each enhancement as a =head2 entry ]
-In 5.22 perl started setting umask to 0600 before calling C<mkstemp(3)>
-and restoring it afterwards. This wrongfully tells open(2) to strip
-the owner read and write bits from the given mode before applying it,
-rather than the intended negation of leaving only those bits in place.
+=head1 Security
-Systems that use mode 0666 in C<mkstemp(3)> (like old versions of
-glibc) create a file with permissions 0066, leaving world read and
-write permissions regardless of current umask.
+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.
-This has been fixed by using umask 0177 instead. [perl #127322]
+[ List each security issue as a =head2 entry ]
=head1 Incompatible Changes
-=head2 C<qr/\N{}/> now disallowed under C<use re "strict">
-
-An empty C<\N{}> makes no sense, but for backwards compatibility is
-silently accepted as doing nothing. But now this is a fatal error under
-the experimental feature L<re/'strict' mode>.
-
-=head1 Performance Enhancements
-
-=over 4
+XXX For a release on a stable branch, this section aspires to be:
-=item *
+ 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.
-The overhead of scope entry and exit has been considerably reduced, so
-for example subroutine calls, loops and basic blocks are all faster now.
-This empty function call now takes about a third less time to execute:
+[ List each incompatible change as a =head2 entry ]
- sub f{} f();
+=head1 Deprecations
-=item *
+XXX Any deprecated features, syntax, modules etc. should be listed here.
-On Win32, C<stat>ing or C<-X>ing a path, if the file or directory does not
-exist, is now 3.5x faster on a SSD (or any drive) than before.
+=head2 Module removals
-=back
+XXX Remove this section if inapplicable.
-=head1 Modules and Pragmata
+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.
-=head2 Updated Modules and Pragmata
+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.
-=over 4
+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.
-=item *
+=over
-F<cpan/podlators/> has been upgraded from version 4.04 to 4.06.
+=item XXX
-=item *
+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.
-The PathTools module collection has been upgraded from version 3.62
-to 3.63.
+=back
-=item *
+[ List each other deprecation as a =head2 entry ]
-L<DynaLoader> has been upgraded from version 1.37 to 1.38.
+=head1 Performance Enhancements
-DynaLoader now always looks for bootstrap files having the same base name as
-the module for which the bootstrap code is being run. Previously, and only on
-platforms that use C<mod2fname> to produce unique loadable library names,
-L<DynaLoader> would look for the bootstrap file using a base name that matched
-the loadable library and not find it.
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
-=item *
+[ List each enhancement as a =item entry ]
-L<Encode> has been upgraded from version 2.78 to 2.80.
+=over 4
=item *
-L<ExtUtils::CBuilder> has been upgraded from version 0.280224 to 0.280225.
+XXX
-=item *
+=back
-L<ExtUtils::MakeMaker> has been upgraded from version 7.10 to 7.10_01.
+=head1 Modules and Pragmata
-=item *
+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.
-L<File::Spec> has been upgraded from version 3.62 to 3.63.
+[ Within each section, list entries as a =item entry ]
-=item *
+=head2 New Modules and Pragmata
-L<IPC::SysV> has been upgraded from version 2.04 to 2.05.
+=over 4
=item *
-L<Module::CoreList> has been upgraded from version 5.20160120 to 5.20160121.
-
-=item *
+XXX
-L<ODBM_File> has been upgraded from version 1.12 to 1.13.
+=back
-=item *
+=head2 Updated Modules and Pragmata
-L<PerlIO::encoding> has been upgraded from version 0.23 to 0.24.
+=over 4
=item *
-L<POSIX> has been upgraded from version 1.59 to 1.63.
+L<XXX> has been upgraded from version A.xx to B.yy.
-It can now export constants for the C<code> value in the hash passed to the
-L<sigaction|POSIX/sigaction> handler when using the C<SA_SIGINFO> flag.
-
-These previously deprecated functions are now removed: C<isalnum>,
-C<isalpha>, C<iscntrl>, C<isdigit>, C<isgraph>, C<islower>, C<isprint>,
-C<ispunct>, C<isspace>, C<isupper>, and C<isxdigit>.
+=back
-=item *
+=head2 Removed Modules and Pragmata
-L<Storable> has been upgraded from version 2.54 to 2.55.
+=over 4
=item *
-L<Time::HiRes> has been upgraded from version 1.9728 to 1.9730.
-
-It can now export Linux-specific and FreeBSD-specific C<clock_gettime()>
-constants. It also now has emulation for OS X C<clock_nanosleep()>,
-C<clock_gettime()>, and C<clock_getres()>.
+XXX
=back
=head1 Documentation
-=head2 Changes to Existing 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>.
-=head3 L<perlguts>
+=head2 New Documentation
-=over 4
+XXX Changes which create B<new> files in F<pod/> go here.
-=item *
+=head3 L<XXX>
-A new section has been added, L<perlguts/"Dynamic Scope and the Context
-Stack">, which explains how the perl context stack works.
+XXX Description of the purpose of the new file here
-=back
+=head2 Changes to Existing Documentation
-=head3 L<perlmodlib>
+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>
=over 4
=item *
-We now recommend contacting the module-authors list or PAUSE in seeking
-guidance on the naming of modules.
+XXX Description of the change here
=back
including warnings and fatal error messages. For the complete list of
diagnostic messages, see L<perldiag>.
+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.
+
=head2 New Diagnostics
+XXX Newly added diagnostic messages go under here, separated into New Errors
+and New Warnings
+
=head3 New Errors
=over 4
=item *
-L<<< Sequence (?PE<lt>... not terminated in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>
-|perldiag/"Sequence (?PE<lt>... not terminated in regex; marked by <-- HERE in mE<sol>%sE<sol>" >>>
-
-=item *
-
-L<Sequence (?PE<gt>... not terminated in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>
-|perldiag/"Sequence (?PE<gt>... not terminated in regex; marked by <-- HERE in mE<sol>%sE<sol>">
-
-=item *
-
-L<Empty \%c in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>
-|perldiag/"Empty \%c in regex; marked by <-- HERE in mE<sol>%sE<sol>">
+XXX L<message|perldiag/"message">
=back
=item *
-L<Assuming NOT a POSIX class since %s in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>|
-perldiag/Assuming NOT a POSIX class since %s in regex; marked by <-- HERE in mE<sol>%sE<sol>>
+XXX L<message|perldiag/"message">
=back
-=head1 Configuration and Compilation
-
-=over 4
-
-=item *
-
-The GNU Make makefile for Win32 now supports parallel builds. [perl #126632]
+=head2 Changes to Existing Diagnostics
-=item *
+XXX Changes (i.e. rewording) of diagnostic messages go here
-You can now build perl with MSVC++ on Win32 using GNU Make. [perl #126632]
+=over 4
=item *
-Bison 3.0 is now supported.
+XXX Describe change here
=back
-=head1 Platform Support
-
-=head2 Platform-Specific Notes
-
-=over 4
+=head1 Utility Changes
-=item VMS
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
+Most of these are built within the directory F<utils>.
-=over
+[ 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. ]
-=item *
+=head2 L<XXX>
-For those C<%ENV> elements based on the CRTL environ array, we've always
-preserved case when setting them but did look-ups only after upcasing the
-key first, which made lower- or mixed-case entries go missing. This problem
-has been corrected by making C<%ENV> elements derived from the environ array
-case-sensitive on look-up as well as case-preserving on store.
+=over 4
=item *
-Environment look-ups for C<PERL5LIB> and C<PERLLIB> previously only
-considered logical names, but now consider all sources of C<%ENV> as
-determined by C<PERL_ENV_TABLES> and as documented in L<perlvms/%ENV>.
-
-=back
-
-=item Win32
-
-Builds using Microsoft Visual C++ 2003 and earlier no longer produce
-an "INTERNAL COMPILER ERROR" message. [perl #126045]
+XXX
=back
-=head1 Internal Changes
-
-=over 4
+=head1 Configuration and Compilation
-=item *
+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.
-The implementation of perl's context stack system, and its internal API,
-have been heavily reworked. Note that no significant changes have been
-made to any external APIs, but XS code which relies on such internal
-details may need to be fixed. The main changes are:
+[ List changes as a =item entry ].
=over 4
=item *
-The C<PUSHBLOCK()>, C<POPSUB()> etc. macros have been replaced with static
-inline functions such as C<cx_pushblock()>, C<cx_popsub()> etc. These use
-function args rather than implicitly relying on local vars such as
-C<gimme> and C<newsp> being available. Also their functionality has
-changed: in particular, C<cx_popblock()> no longer decrements
-C<cxstack_ix>. The ordering of the steps in the C<pp_leave*> functions
-involving C<cx_popblock()>, C<cx_popsub()> etc. has changed. See the new
-documentation, L<perlguts/"Dynamic Scope and the Context Stack">, for
-details on how to use them.
+XXX
-=item *
+=back
-Various macros, which now consistently have a CX_ prefix, have been added:
+=head1 Testing
- CX_CUR(), CX_LEAVE_SCOPE(), CX_POP()
+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.
-or renamed:
+[ List each test improvement as a =item entry ]
- CX_POP_SAVEARRAY(), CX_DEBUG(), CX_PUSHSUBST(), CX_POPSUBST()
+=over 4
=item *
-C<cx_pushblock()> now saves C<PL_savestack_ix> and C<PL_tmps_floor>, so
-C<pp_enter*> and C<pp_leave*> no longer do
+XXX
- ENTER; SAVETMPS; ....; LEAVE
+=back
-=item *
+=head1 Platform Support
-C<cx_popblock()> now also restores C<PL_curpm>.
+XXX Any changes to platform support should be listed in the sections below.
-=item *
+[ Within the sections, list each platform as a =item entry with specific
+changes as paragraphs below it. ]
-In C<dounwind()> for every context type, the current savestack frame is
-now processed before each context is popped; formerly this was only done
-for sub-like context frames. This action has been removed from
-C<cx_popsub()> and placed into its own macro, C<CX_LEAVE_SCOPE(cx)>, which
-must be called before C<cx_popsub()> etc.
+=head2 New Platforms
-C<dounwind()> now also does a C<cx_popblock()> on the last popped frame
-(formerly it only did the C<cx_popsub()> etc. actions on each frame).
+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.
-=item *
+=over 4
-The temps stack is now freed on scope exit; previously, temps created
-during the last statement of a block wouldn't be freed until the next
-C<nextstate> following the block (apart from an existing hack that did
-this for recursive subs in scalar context); and in something like
-C<f(g())>, the temps created by the last statement in C<g()> would
-formerly not be freed until the statement following the return from
-C<f()>.
+=item XXX-some-platform
-=item *
+XXX
-Most values that were saved on the savestack on scope entry are now
-saved in suitable new fields in the context struct, and saved and
-restored directly by C<cx_pushfoo()> and C<cx_popfoo()>, which is much
-faster.
+=back
-=item *
+=head2 Discontinued Platforms
-Various context struct fields have been added, removed or modified.
+XXX List any platforms that this version of perl no longer compiles on.
-=item *
+=over 4
-The handling of C<@_> in C<cx_pushsub()> and C<cx_popsub()> has been
-considerably tidied up, including removing the C<argarray> field from the
-context struct, and extracting out some common (but rarely used) code into
-a separate function, C<clear_defarray()>. Also, useful subsets of
-C<cx_popsub()> which had been unrolled in places like C<pp_goto> have been
-gathered into the new functions C<cx_popsub_args()> and
-C<cx_popsub_common()>.
+=item XXX-some-platform
-=item *
+XXX
+
+=back
-C<pp_leavesub> and C<pp_leavesublv> now use the same function as the rest
-of the C<pp_leave*>'s to process return args.
+=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.
-C<CXp_FOR_PAD> and C<CXp_FOR_GV> flags have been added, and
-C<CXt_LOOP_FOR> has been split into C<CXt_LOOP_LIST>, C<CXt_LOOP_ARY>.
+=over 4
-=item *
+=item XXX-some-platform
-Some variables formerly declared by C<dMULTICALL> (but not documented) have
-been removed.
+XXX
=back
-=back
+=head1 Internal Changes
-=head1 Selected Bug Fixes
+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 ]
=over 4
=item *
-Line numbers larger than 2**31-1 but less than 2**32 are no longer
-returned by caller() as negative numbers. [perl #126991]
-
-=item *
+XXX
-C<< unless ( I<assignment> ) >> now properly warns when syntax
-warnings are enabled. [perl #127122]
+=back
-=item *
+=head1 Selected Bug Fixes
-Setting an C<ISA> glob to an array reference now properly adds
-C<isaelem> magic to any existing elements. Previously modifying such
-an element would not update the ISA cache, so method calls would call
-the wrong function. Perl would also crash if the C<ISA> glob was
-destroyed, since new code added in 5.23.7 would try to release the
-C<isaelem> magic from the elements. [perl #127351]
+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>.
-=item *
+[ List each fix as a =item entry ]
-If a here-doc was found while parsing another operator, the parser had
-already read end of file, and the here-doc was not terminated, perl
-could produce an assertion or a segmentation fault. This now reliably
-complains about the unterminated here-doc. [perl #125540]
+=over 4
=item *
-untie() would sometimes return the last value returned by the UNTIE()
-handler as well as it's normal value, messing up the stack. [perl
-#126621]
+XXX
-=item *
-
-Fixed an operator precedence problem when C< castflags & 2> is true.
-[perl #127474]
+=back
-=item *
+=head1 Known Problems
-Caching of DESTROY methods could result in a non-pointer or a
-non-STASH stored in the SvSTASH() slot of a stash, breaking the B
-STASH() method. The DESTROY method is now cached in the MRO metadata
-for the stash. [perl #126410]
+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 ]
-The AUTOLOAD method is now called when searching for a DESTROY method,
-and correctly sets C<$AUTOLOAD> too. [perl #124387] [perl #127494]
+=over 4
=item *
-Avoid parsing beyond the end of the buffer when processing a C<#line>
-directive with no filename. [perl #127334]
-
-=item *
+XXX
-Perl now raises a warning when a regular expression pattern looks like
-it was supposed to contain a POSIX class, like C<qr/[[:alpha:]]/>, but
-there was some slight defect in its specification which causes it to
-instead be treated as a regular bracketed character class. An example
-would be missing the second colon in the above like this:
-C<qr/[[:alpha]]/>. This compiles to match a sequence of two characters.
-The second is C<"]">, and the first is any of: C<"[">, C<":">, C<"a">,
-C<"h">, C<"l">, or C<"p">. This is unlikely to be the intended
-meaning, and now a warning is raised. No warning is raised unless the
-specification is very close to one of the 14 legal POSIX classes. (See
-L<perlrecharclass/POSIX Character Classes>.)
-[perl #8904]
+=back
-=item *
+=head1 Errata From Previous Releases
-Certain regex patterns involving a complemented POSIX class in an
-inverted bracketed character class, and matching something else
-optionally would improperly fail to match. An example of one that could
-fail is C</qr/_?[^\Wbar]\x{100}/>. This has been fixed.
-[perl #127537]
+=over 4
=item *
-Perl 5.22 added support to the C99 hexadecimal floating point notation,
-but sometimes misparses hex floats. This had been fixed.
-[perl #127183]
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
=back
-=head1 Acknowledgements
-
-Perl 5.23.8 represents approximately 4 weeks of development since Perl 5.23.7
-and contains approximately 30,000 lines of changes across 350 files from 23
-authors.
-
-Excluding auto-generated files, documentation and release tools, there were
-approximately 14,000 lines of changes to 210 .pm, .t, .c and .h files.
+=head1 Obituary
-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 5.23.8:
+XXX If any significant core contributor has died, we've added a short obituary
+here.
-Aaron Crane, Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari
-Mannsåker, Daniel Dragan, David Mitchell, Ed J, Herbert Breunung, H.Merijn
-Brand, James E Keenan, Jarkko Hietaniemi, Karl Williamson, Lukas Mai, Niko
-Tyni, Pip Cet, Ricardo Signes, Sawyer X, Sisyphus, Stevan Little, Steve Hay,
-Todd Rinaldo, Tom Hukins, 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.
+=head1 Acknowledgements
-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.
+XXX Generate this with:
-For a more complete list of all of Perl's historical contributors, please see
-the F<AUTHORS> file in the Perl source distribution.
+ perl Porting/acknowledgements.pl v5.23.8..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / commitdiff