5 [ this is a template for a new perldelta file. Any text flagged as XXX needs
6 to be processed before release. ]
8 perldelta - what is new for perl v5.27.8
12 This document describes differences between the 5.27.7 release and the 5.27.8
15 If you are upgrading from an earlier release such as 5.27.6, first read
16 L<perl5277delta>, which describes differences between 5.27.6 and 5.27.7.
20 XXX Any important notices here
22 =head1 Core Enhancements
24 XXX New core language features go here. Summarize user-visible core language
25 enhancements. Particularly prominent performance optimisations could go
26 here, but most should go in the L</Performance Enhancements> section.
28 [ List each enhancement as a =head2 entry ]
30 =head2 Close-on-exec flag set atomically
32 When opening a file descriptor, perl now generally opens it with its
33 close-on-exec flag already set, on platforms that support doing so.
34 This improves thread safety, because it means that an C<exec> initiated
35 by one thread can no longer cause a file descriptor in the process
36 of being opened by another thread to be accidentally passed to the
39 Additionally, perl now sets the close-on-exec flag more reliably, whether
40 it does so atomically or not. Most file descriptors were getting the
41 flag set, but some were being missed.
45 XXX Any security-related notices go here. In particular, any security
46 vulnerabilities closed should be noted here rather than in the
47 L</Selected Bug Fixes> section.
49 [ List each security issue as a =head2 entry ]
51 =head1 Incompatible Changes
53 XXX For a release on a stable branch, this section aspires to be:
55 There are no changes intentionally incompatible with 5.XXX.XXX
56 If any exist, they are bugs, and we request that you submit a
57 report. See L</Reporting Bugs> below.
59 [ List each incompatible change as a =head2 entry ]
63 XXX Any deprecated features, syntax, modules etc. should be listed here.
65 =head2 Module removals
67 XXX Remove this section if not applicable.
69 The following modules will be removed from the core distribution in a
70 future release, and will at that time need to be installed from CPAN.
71 Distributions on CPAN which require these modules will need to list them as
74 The core versions of these modules will now issue C<"deprecated">-category
75 warnings to alert you to this fact. To silence these deprecation warnings,
76 install the modules in question from CPAN.
78 Note that these are (with rare exceptions) fine modules that you are encouraged
79 to continue to use. Their disinclusion from core primarily hinges on their
80 necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
81 not usually on concerns over their design.
87 XXX Note that deprecated modules should be listed here even if they are listed
88 as an updated module in the L</Modules and Pragmata> section.
92 [ List each other deprecation as a =head2 entry ]
94 =head1 Performance Enhancements
96 XXX Changes which enhance performance without changing behaviour go here.
97 There may well be none in a stable release.
99 [ List each enhancement as an =item entry ]
109 =head1 Modules and Pragmata
111 XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
112 go here. If Module::CoreList is updated, generate an initial draft of the
113 following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
114 for important changes should then be added by hand. In an ideal world,
115 dual-life modules would have a F<Changes> file that could be cribbed.
117 The list of new and updated modules is modified automatically as part of
118 preparing a Perl release, so the only reason to manually add entries here is if
119 you're summarising the important changes in the module update. (Also, if the
120 manually-added details don't match the automatically-generated ones, the
121 release manager will have to investigate the situation carefully.)
123 [ Within each section, list entries as an =item entry ]
125 =head2 New Modules and Pragmata
131 XXX Remove this section if not applicable.
135 =head2 Updated Modules and Pragmata
141 L<XXX> has been upgraded from version A.xx to B.yy.
143 If there was something important to note about this change, include that here.
147 =head2 Removed Modules and Pragmata
159 XXX Changes to files in F<pod/> go here. Consider grouping entries by
160 file and be sure to link to the appropriate page, e.g. L<perlfunc>.
162 =head2 New Documentation
164 XXX Changes which create B<new> files in F<pod/> go here.
168 XXX Description of the purpose of the new file here
170 =head2 Changes to Existing Documentation
172 We have attempted to update the documentation to reflect the changes
173 listed in this document. If you find any we have missed, send email
174 to L<perlbug@perl.org|mailto:perlbug@perl.org>.
176 XXX Changes which significantly change existing files in F<pod/> go here.
177 However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
180 Additionally, the following selected changes have been made:
188 XXX Description of the change here
194 The following additions or changes have been made to diagnostic output,
195 including warnings and fatal error messages. For the complete list of
196 diagnostic messages, see L<perldiag>.
198 XXX New or changed warnings emitted by the core's C<C> code go here. Also
199 include any changes in L<perldiag> that reconcile it to the C<C> code.
201 =head2 New Diagnostics
203 XXX Newly added diagnostic messages go under here, separated into New Errors
212 XXX L<message|perldiag/"message">
222 XXX L<message|perldiag/"message">
226 =head2 Changes to Existing Diagnostics
228 XXX Changes (i.e. rewording) of diagnostic messages go here
234 XXX Describe change here
238 =head1 Utility Changes
240 XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
241 Most of these are built within the directory F<utils>.
243 [ List utility changes as a =head2 entry for each utility and =item
244 entries for each change
245 Use L<XXX> with program names to get proper documentation linking. ]
257 =head1 Configuration and Compilation
259 XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
260 go here. Any other changes to the Perl build process should be listed here.
261 However, any platform-specific changes should be listed in the
262 L</Platform Support> section, instead.
264 [ List changes as an =item entry ].
276 XXX Any significant changes to the testing of a freshly built perl should be
277 listed here. Changes which create B<new> files in F<t/> go here as do any
278 large changes to the testing harness (e.g. when parallel testing was added).
279 Changes to existing files in F<t/> aren't worth summarizing, although the bugs
280 that they represent may be covered elsewhere.
282 XXX If there were no significant test changes, say this:
284 Tests were added and changed to reflect the other additions and changes
287 XXX If instead there were significant changes, say this:
289 Tests were added and changed to reflect the other additions and
290 changes in this release. Furthermore, these significant changes were
293 [ List each test improvement as an =item entry ]
303 =head1 Platform Support
305 XXX Any changes to platform support should be listed in the sections below.
307 [ Within the sections, list each platform as an =item entry with specific
308 changes as paragraphs below it. ]
312 XXX List any platforms that this version of perl compiles on, that previous
313 versions did not. These will either be enabled by new files in the F<hints/>
314 directories, or new subdirectories and F<README> files at the top level of the
319 =item XXX-some-platform
325 =head2 Discontinued Platforms
327 XXX List any platforms that this version of perl no longer compiles on.
331 =item XXX-some-platform
337 =head2 Platform-Specific Notes
339 XXX List any changes for specific platforms. This could include configuration
340 and compilation changes or changes in portability/compatibility. However,
341 changes within modules for platforms should generally be listed in the
342 L</Modules and Pragmata> section.
346 =item XXX-some-platform
352 =head1 Internal Changes
354 XXX Changes which affect the interface available to C<XS> code go here. Other
355 significant internal changes for future core maintainers should be noted as
358 [ List each change as an =item entry ]
368 =head1 Selected Bug Fixes
370 XXX Important bug fixes in the core language are summarized here. Bug fixes in
371 files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
373 [ List each fix as an =item entry ]
383 =head1 Known Problems
385 XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
386 tests that had to be C<TODO>ed for the release would be noted here. Unfixed
387 platform specific bugs also go here.
389 [ List each fix as an =item entry ]
399 =head1 Errata From Previous Releases
405 XXX Add anything here that we forgot to add, or were mistaken about, in
406 the perldelta of a previous release.
412 XXX If any significant core contributor or member of the CPAN community has
413 died, add a short obituary here.
415 =head1 Acknowledgements
417 XXX Generate this with:
419 perl Porting/acknowledgements.pl v5.27.7..HEAD
421 =head1 Reporting Bugs
423 If you find what you think is a bug, you might check the perl bug database
424 at L<https://rt.perl.org/> . There may also be information at
425 L<http://www.perl.org/> , the Perl Home Page.
427 If you believe you have an unreported bug, please run the L<perlbug> program
428 included with your release. Be sure to trim your bug down to a tiny but
429 sufficient test case. Your bug report, along with the output of C<perl -V>,
430 will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
432 If the bug you are reporting has security implications which make it
433 inappropriate to send to a publicly archived mailing list, then see
434 L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
435 for details of how to report the issue.
439 If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
440 you can do so by running the C<perlthanks> program:
444 This will send an email to the Perl 5 Porters list with your show of thanks.
448 The F<Changes> file for an explanation of how to view exhaustive details on
451 The F<INSTALL> file for how to build Perl.
453 The F<README> file for general stuff.
455 The F<Artistic> and F<Copying> files for copyright information.