=head1 NAME
-perldelta - what is new for perl v5.27.8
+[ 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 v5.29.3
=head1 DESCRIPTION
-This document describes differences between the 5.27.7 release and the 5.27.8
+This document describes differences between the 5.29.2 release and the 5.29.3
release.
-If you are upgrading from an earlier release such as 5.27.6, first read
-L<perl5277delta>, which describes differences between 5.27.6 and 5.27.7.
+If you are upgrading from an earlier release such as 5.29.1, first read
+L<perl5292delta>, which describes differences between 5.29.1 and 5.29.2.
-=head1 Core Enhancements
+=head1 Notice
-=head2 Close-on-exec flag set atomically
+XXX Any important notices here
-When opening a file descriptor, perl now generally opens it with its
-close-on-exec flag already set, on platforms that support doing so.
-This improves thread safety, because it means that an C<exec> initiated
-by one thread can no longer cause a file descriptor in the process
-of being opened by another thread to be accidentally passed to the
-executed program.
+=head1 Core Enhancements
-Additionally, perl now sets the close-on-exec flag more reliably, whether
-it does so atomically or not. Most file descriptors were getting the
-flag set, but some were being missed.
+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 Mixed Unicode scripts are now detectable
+[ List each enhancement as a =head2 entry ]
-A mixture of scripts, such as Cyrillic and Latin, in a string is often
-the sign of a spoofing attack. A new regular expression construct
-now allows for easy detection of these. For example, you can say
+=head1 Security
- qr/(?script_run: \d+ \b )/x
+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.
-And the digits matched will all be from the same set of 10. You won't
-get a look-alike digit from a different script that has a different
-value than what it appears to be.
+[ List each security issue as a =head2 entry ]
-=head2 String- and number-specific bitwise ops are no longer experimental
+=head1 Incompatible Changes
-The new string-specific (C<&. |. ^. ~.>) and number-specific (C<& | ^ ~>)
-bitwise operators introduced in Perl 5.22 are no longer experimental.
-Because the number-specific ops are spelled the same way as the existing
-operators that choose their behaviour based on their operands, these
-operators must still be enabled via the "bitwise" feature, in either of
-these two ways:
+XXX For a release on a stable branch, this section aspires to be:
- use feature "bitwise";
+ 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.
- use v5.28; # "bitwise" now included
+[ List each incompatible change as a =head2 entry ]
-They are also now enabled by the B<-E> command-line switch.
+=head1 Deprecations
-The "bitwise" feature no longer emits a warning. Existing code that
-disables the "experimental::bitwise" warning category that the feature
-previously used will continue to work.
+XXX Any deprecated features, syntax, modules etc. should be listed here.
-One caveat that module authors ought to be aware of is that the numeric
-operators now pass a fifth TRUE argument to overload methods. Any methods
-that check the number of operands may croak if they do not expect so many.
-XS authors in particular should be aware that this:
+=head2 Module removals
- SV *
- bitop_handler (lobj, robj, swap)
+XXX Remove this section if not applicable.
-may need to be changed to this:
+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.
- SV *
- bitop_handler (lobj, robj, swap, ...)
+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.
-=head1 Incompatible Changes
+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.
-=head2 Smartmatch and switch reversion
+=over
-The changes to the experimental smart match operator (C<~~>) and switch
-(C<given>/C<when>) constructs that were made in Perl 5.27.7 have been
-reverted due to the extent of the trouble caused to CPAN modules.
-It is expected that smartmatch will be changed again in the future,
-but preceded by some kind of explicit deprecation.
+=item XXX
-=head1 Deprecations
+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.
-=head2 Use of code points over 0xFF in string bitwise operators
+=back
-Some uses of these already are illegal after a previous deprecation
-cycle. This deprecates the remaining uses. See L<perldeprecation>.
+[ List each other deprecation as a =head2 entry ]
=head1 Performance Enhancements
+XXX Changes which enhance performance without changing behaviour go here.
+There may well be none in a stable release.
+
+[ List each enhancement as an =item entry ]
+
=over 4
=item *
-The performance of pattern matching C<[[:ascii:]]> and C<[[:^ascii:]]>
-has been improved significantly except on EBCDIC platforms.
+XXX
=back
=head1 Modules and Pragmata
+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.
+
+The list of new and updated modules is modified automatically as part of
+preparing a Perl release, so the only reason to manually add entries here is if
+you're summarising the important changes in the module update. (Also, if the
+manually-added details don't match the automatically-generated ones, the
+release manager will have to investigate the situation carefully.)
+
+[ Within each section, list entries as an =item entry ]
+
=head2 New Modules and Pragmata
=over 4
If there was something important to note about this change, include that here.
-=item *
-
-L<Unicode::UCD> has been upgraded from version 0.69 to 0.70.
-
-The function C<num> now accepts an optional parameter to help in
-diagnosing error returns.
-
-=item *
-
-L<XSLoader> has been upgraded from version 0.29 to 0.30.
-
-Platforms that use C<mod2fname> to edit the names of loadable libraries now look for
-bootstrap (.bs) files under the correct, non-edited name.
-
-=item *
-
-L<Socket> has been upgraded from version 2.020_04 to 2.027.
-
=back
=head2 Removed Modules and Pragmata
=item *
-XXX
+C<Locale::Codes> has been removed at the request of its author. It
+continues to be available on CPAN C<L<Locale::Codes>>. [perl #133458].
=back
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
We have attempted to update the documentation to reflect the changes
listed in this document. If you find any we have missed, send email
to L<perlbug@perl.org|mailto:perlbug@perl.org>.
+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.
+
Additionally, the following selected changes have been made:
-=head3 L<perlembed>
+=head3 L<XXX>
=over 4
=item *
-An example in L<perlembed> used the string value of C<ERRSV> as a
-format string when calling croak(). If that string contains format
-codes such as C<%s> this could crash the program.
+XXX Description of the change here
-This has been changed to a call to croak_sv().
+=back
-An alternative could have been to supply a trivial format string:
+=head1 Diagnostics
- croak("%s", SvPV_nolen(ERRSV));
+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>.
-or as a special case for C<ERRSV> simply:
+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.
- croak(NULL);
+=head2 New Diagnostics
-=back
+XXX Newly added diagnostic messages go under here, separated into New Errors
+and New Warnings
-=head3 L<perlfunc>
+=head3 New Errors
=over 4
=item *
-Improve the documentation of C<each> with a slightly more
-explicit description of the sharing of iterator state, and with
-caveats regarding the fragility of while-each loops. [perl #132644]
+XXX L<message|perldiag/"message">
=back
-=head3 L<perlfunc>, L<perlop>, L<perlsyn>
+=head3 New Warnings
=over 4
=item *
-Improve the documentation of while condition magic in various
-places. [perl #132644]
+XXX L<message|perldiag/"message">
=back
-=head3 L<perlrun>
+=head2 Changes to Existing Diagnostics
+
+XXX Changes (i.e. rewording) of diagnostic messages go here
=over 4
=item *
-Clarify the documentation of B<< -m >>. [perl #131518]
+XXX Describe change here
=back
-=head1 Diagnostics
+=head1 Utility Changes
-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>.
+XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
+Most of these are built within the directory F<utils>.
-=head2 New Diagnostics
+[ 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. ]
-=head3 New Errors
+=head2 L<XXX>
=over 4
=item *
-L<Can't "goto" into a binary or list expression|perldiag/"Can't E<quot>gotoE<quot> into a binary or list expression">
-
-Use of C<goto> to jump into the parameter of a binary or list operator has
-been prohibited, to prevent crashes and stack corruption. [perl #130936]
+XXX
=back
-=head2 Changes to Existing Diagnostics
+=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 an =item entry ].
=over 4
=item *
-The C<< Unable to flush stdout >> error message was missing a trailing
-newline. [debian #875361]
+XXX
=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.
+
+XXX If there were no significant test changes, say this:
+
+Tests were added and changed to reflect the other additions and changes
+in this release.
+
+XXX If instead there were significant changes, say this:
+
Tests were added and changed to reflect the other additions and
changes in this release. Furthermore, these significant changes were
made:
+[ List each test improvement as an =item entry ]
+
=over 4
=item *
-Allow override of watchdog timer count in F<re/pat_psycho.t>.
-
-This test can take a long time to run, so there is a timer to keep
-this in check (currently, 5 minutes). This commit adds checking
-the environment variable C<< PERL_TEST_TIME_OUT_FACTOR >>; if set,
-the time out setting is multiplied by its value.
+XXX
=back
=head1 Platform Support
-=head2 Platform-Specific Notes
+XXX Any changes to platform support should be listed in the sections below.
+
+[ Within the sections, list each platform as an =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.
=over 4
-=item Cygwin
+=item XXX-some-platform
-A build with the quadmath library can now be done on Cygwin.
+XXX
+
+=back
-=item FreeBSD
+=head2 Discontinued Platforms
-FreeBSD's F<< /usr/share/mk/sys.mk >> specifies C<< -O2 >> for
-architectures other than arm and mips. By default, compile perl
-with the same optimization levels.
+XXX List any platforms that this version of perl no longer compiles on.
-=item VMS
+=over 4
-Several fix-ups for F<configure.com>, marking function VMS has
-(or doesn't have).
+=item XXX-some-platform
+XXX
=back
-=head1 Internal Changes
+=head2 Platform-Specific Notes
+
+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.
=over 4
-=item *
+=item Windows
-The format of the non-utf8 transliteration table attached to the C<op_pv>
-field of C<OP_TRANS>/C<OP_TRANSR> ops has changed. It's now a
-C<struct OPtrans_map>.
+The Windows Server 2003 SP1 Platform SDK build, with its early x64 compiler and
+tools, was accidentally broken in Perl 5.27.9. This has now been fixed.
=back
-=head1 Selected Bug Fixes
+=head1 Internal Changes
-=over 4
+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.
-=item *
+[ List each change as an =item entry ]
-The C<printf> format specifier C<%.0f> no longer rounds incorrectly
-[perl #47602], and now shows the correct sign for a negative zero.
+=over 4
=item *
-Fixed a use after free bug in pp_list introduced in 5.27.1. [perl #131954]
-
-=item *
+XXX
-Don't stringify numeric first arguments to
-C<< system() >> on Windows or VMS. [perl #132633]
+=back
-=item *
+=head1 Selected Bug Fixes
-Fixed an issue where the error C<< Scalar value @arrayname[0] better
-written as $arrayname >> would give an error C<< Cannot printf Inf with 'c' >>
-when arrayname starts with C<< Inf >>. [perl #132645]
+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 an =item entry ]
-The Perl implementation of C<< getcwd() >> in C<< Cwd >> in the PathTools
-distribution now behaves the same as XS implementation on errors: it
-returns an error, and sets C<< $! >>. [perl #132648]
+=over 4
=item *
-Fixed argument counting in multiconcat when concatenating adjacent constants.
-[perl #132646]
-
-=item *
+XXX
-Vivify array elements when putting them on the stack.
-Fixes [perl #8910] (reported in April 2002).
+=back
-=item *
+=head1 Known Problems
-Fixed parsing of braced subscript after parens. Fixes [perl #8045]
-(reported in December 2001).
+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 an =item entry ]
-C<tr/non_utf8/long_non_utf8/c> could give the wrong results when the
-length of the replacement character list was greater than 0x7fff.
+=over 4
=item *
-C<tr/non_utf8/non_utf8/cd> failed to add the implied
-C<\x{100}-\x{7fffffff}> to the search character list.
+XXX
=back
-=head1 Known Problems
+=head1 Errata From Previous Releases
=over 4
=item *
-The bugfix for [perl #2754] in Perl 5.27.7 turned out to cause so much
-trouble on CPAN [perl #132577] that it is being postponed. The bug has
-been restored, so C<exit(0)> in a C<UNITCHECK> or C<CHECK> block now
-once again permits the main program to run, and C<exit(0)> in a C<BEGIN>
-block once again permits C<INIT> blocks to run before exiting. The bug
-will be fixed again for Perl 5.30.
+XXX Add anything here that we forgot to add, or were mistaken about, in
+the perldelta of a previous release.
=back
+=head1 Obituary
+
+XXX If any significant core contributor or member of the CPAN community has
+died, add a short obituary here.
+
=head1 Acknowledgements
XXX Generate this with:
- perl Porting/acknowledgements.pl v5.27.7..HEAD
+ perl Porting/acknowledgements.pl v5.29.2..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff