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perldelta for Unicode 9.0
[perl5.git] / pod / perldelta.pod
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1=encoding utf8
2
3=head1 NAME
4
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5[ this is a template for a new perldelta file. Any text flagged as XXX needs
6to be processed before release. ]
7
8perldelta - what is new for perl v5.25.3
eabfc7bc 9
2cfe9b50 10=head1 DESCRIPTION
eabfc7bc 11
228bfab9 12This document describes differences between the 5.25.2 release and the 5.25.3
4b8803f0 13release.
f3ed8cbf 14
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15If you are upgrading from an earlier release such as 5.25.1, first read
16L<perl5252delta>, which describes differences between 5.25.1 and 5.25.2.
a4a439fb 17
228bfab9 18=head1 Notice
6696cfa7 19
228bfab9 20XXX Any important notices here
6696cfa7 21
228bfab9 22=head1 Core Enhancements
2901a589 23
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24XXX New core language features go here. Summarize user-visible core language
25enhancements. Particularly prominent performance optimisations could go
26here, but most should go in the L</Performance Enhancements> section.
f72f2c07 27
228bfab9 28[ List each enhancement as a =head2 entry ]
f72f2c07 29
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30=head2 Unicode 9.0 is now supported
31
32A list of changes is at
33L<http://www.unicode.org/versions/Unicode9.0.0/>. Modules that are
34shipped with core Perl but not maintained by p5p do not necessarily
35support Unicode 9.0. L<Unicode::Normalize> does work on 9.0.
36
efdbe372 37=head1 Security
bf1007bc 38
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39XXX Any security-related notices go here. In particular, any security
40vulnerabilities closed should be noted here rather than in the
41L</Selected Bug Fixes> section.
1ba11575 42
228bfab9 43[ List each security issue as a =head2 entry ]
1ba11575 44
efdbe372 45=head1 Incompatible Changes
1656665e 46
228bfab9 47XXX For a release on a stable branch, this section aspires to be:
62ba6383 48
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49 There are no changes intentionally incompatible with 5.XXX.XXX
50 If any exist, they are bugs, and we request that you submit a
51 report. See L</Reporting Bugs> below.
62ba6383 52
228bfab9 53[ List each incompatible change as a =head2 entry ]
62ba6383 54
228bfab9 55=head1 Deprecations
62ba6383 56
228bfab9 57XXX Any deprecated features, syntax, modules etc. should be listed here.
0302547a 58
228bfab9 59=head2 Module removals
efdbe372 60
228bfab9 61XXX Remove this section if inapplicable.
0302547a 62
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63The following modules will be removed from the core distribution in a
64future release, and will at that time need to be installed from CPAN.
65Distributions on CPAN which require these modules will need to list them as
66prerequisites.
0302547a 67
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68The core versions of these modules will now issue C<"deprecated">-category
69warnings to alert you to this fact. To silence these deprecation warnings,
70install the modules in question from CPAN.
8c3f6b0b 71
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72Note that these are (with rare exceptions) fine modules that you are encouraged
73to continue to use. Their disinclusion from core primarily hinges on their
74necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
75not usually on concerns over their design.
8c3f6b0b 76
228bfab9 77=over
8c3f6b0b 78
228bfab9 79=item XXX
8c3f6b0b 80
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81XXX Note that deprecated modules should be listed here even if they are listed
82as an updated module in the L</Modules and Pragmata> section.
8c3f6b0b 83
228bfab9 84=back
8c3f6b0b 85
228bfab9 86[ List each other deprecation as a =head2 entry ]
8c3f6b0b 87
228bfab9 88=head1 Performance Enhancements
8c3f6b0b 89
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90XXX Changes which enhance performance without changing behaviour go here.
91There may well be none in a stable release.
8c3f6b0b 92
228bfab9 93[ List each enhancement as a =item entry ]
8c3f6b0b 94
228bfab9 95=over 4
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96
97=item *
98
228bfab9 99XXX
8c3f6b0b 100
228bfab9 101=back
8c3f6b0b 102
228bfab9 103=head1 Modules and Pragmata
8c3f6b0b 104
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105XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
106go here. If Module::CoreList is updated, generate an initial draft of the
107following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
108for important changes should then be added by hand. In an ideal world,
109dual-life modules would have a F<Changes> file that could be cribbed.
8c3f6b0b 110
228bfab9 111[ Within each section, list entries as a =item entry ]
8c3f6b0b 112
228bfab9 113=head2 New Modules and Pragmata
8c3f6b0b 114
228bfab9 115=over 4
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116
117=item *
118
228bfab9 119XXX
8c3f6b0b 120
228bfab9 121=back
8c3f6b0b 122
228bfab9 123=head2 Updated Modules and Pragmata
8c3f6b0b 124
228bfab9 125=over 4
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126
127=item *
128
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129L<Module::CoreList> has been upgraded from version 5.20160620 to 5.20160720.
130
131=item *
132
228bfab9 133L<XXX> has been upgraded from version A.xx to B.yy.
0302547a 134
228bfab9 135=back
adff8e6f 136
228bfab9 137=head2 Removed Modules and Pragmata
8c3f6b0b 138
228bfab9 139=over 4
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140
141=item *
142
228bfab9 143XXX
8c3f6b0b 144
228bfab9 145=back
8c3f6b0b 146
228bfab9 147=head1 Documentation
8c3f6b0b 148
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149XXX Changes to files in F<pod/> go here. Consider grouping entries by
150file and be sure to link to the appropriate page, e.g. L<perlfunc>.
8c3f6b0b 151
228bfab9 152=head2 New Documentation
8c3f6b0b 153
228bfab9 154XXX Changes which create B<new> files in F<pod/> go here.
8c3f6b0b 155
228bfab9 156=head3 L<XXX>
8c3f6b0b 157
228bfab9 158XXX Description of the purpose of the new file here
8c3f6b0b 159
228bfab9 160=head2 Changes to Existing Documentation
8c3f6b0b 161
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162XXX Changes which significantly change existing files in F<pod/> go here.
163However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
164section.
8c3f6b0b 165
228bfab9 166=head3 L<XXX>
8c3f6b0b 167
228bfab9 168=over 4
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169
170=item *
171
228bfab9 172XXX Description of the change here
8c3f6b0b 173
228bfab9 174=back
8c3f6b0b 175
228bfab9 176=head1 Diagnostics
8c3f6b0b 177
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178The following additions or changes have been made to diagnostic output,
179including warnings and fatal error messages. For the complete list of
180diagnostic messages, see L<perldiag>.
8c3f6b0b 181
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182XXX New or changed warnings emitted by the core's C<C> code go here. Also
183include any changes in L<perldiag> that reconcile it to the C<C> code.
8c3f6b0b 184
228bfab9 185=head2 New Diagnostics
0302547a 186
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187XXX Newly added diagnostic messages go under here, separated into New Errors
188and New Warnings
0302547a 189
228bfab9 190=head3 New Errors
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191
192=over 4
193
194=item *
195
228bfab9 196XXX L<message|perldiag/"message">
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197
198=back
199
228bfab9 200=head3 New Warnings
e388eafa
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201
202=over 4
203
204=item *
205
228bfab9 206XXX L<message|perldiag/"message">
e388eafa
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207
208=back
209
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210=head2 Changes to Existing Diagnostics
211
212XXX Changes (i.e. rewording) of diagnostic messages go here
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213
214=over 4
215
216=item *
217
228bfab9 218XXX Describe change here
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219
220=back
221
228bfab9 222=head1 Utility Changes
e388eafa 223
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224XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
225Most of these are built within the directory F<utils>.
e388eafa 226
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227[ List utility changes as a =head2 entry for each utility and =item
228entries for each change
229Use L<XXX> with program names to get proper documentation linking. ]
e388eafa 230
228bfab9 231=head2 L<XXX>
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232
233=over 4
234
235=item *
236
228bfab9 237XXX
b20d3b89 238
228bfab9 239=back
e388eafa 240
228bfab9 241=head1 Configuration and Compilation
e388eafa 242
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243XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
244go here. Any other changes to the Perl build process should be listed here.
245However, any platform-specific changes should be listed in the
246L</Platform Support> section, instead.
e388eafa 247
228bfab9 248[ List changes as a =item entry ].
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249
250=over 4
251
252=item *
253
228bfab9 254XXX
e388eafa 255
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256=back
257
228bfab9 258=head1 Testing
0302547a 259
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260XXX Any significant changes to the testing of a freshly built perl should be
261listed here. Changes which create B<new> files in F<t/> go here as do any
262large changes to the testing harness (e.g. when parallel testing was added).
263Changes to existing files in F<t/> aren't worth summarizing, although the bugs
264that they represent may be covered elsewhere.
0302547a 265
228bfab9 266[ List each test improvement as a =item entry ]
0302547a 267
efdbe372 268=over 4
0302547a 269
a7efcf70 270=item *
0302547a 271
228bfab9 272XXX
8165798c 273
228bfab9 274=back
8165798c 275
228bfab9 276=head1 Platform Support
8165798c 277
228bfab9 278XXX Any changes to platform support should be listed in the sections below.
8165798c 279
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280[ Within the sections, list each platform as a =item entry with specific
281changes as paragraphs below it. ]
8165798c 282
228bfab9 283=head2 New Platforms
8165798c 284
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285XXX List any platforms that this version of perl compiles on, that previous
286versions did not. These will either be enabled by new files in the F<hints/>
287directories, or new subdirectories and F<README> files at the top level of the
288source tree.
8165798c 289
228bfab9 290=over 4
397c43d8 291
228bfab9 292=item XXX-some-platform
8e84dec2 293
228bfab9 294XXX
0302547a 295
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296=back
297
228bfab9 298=head2 Discontinued Platforms
0302547a 299
228bfab9 300XXX List any platforms that this version of perl no longer compiles on.
0302547a 301
228bfab9 302=over 4
0302547a 303
228bfab9 304=item XXX-some-platform
8e84dec2 305
228bfab9 306XXX
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307
308=back
309
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310=head2 Platform-Specific Notes
311
312XXX List any changes for specific platforms. This could include configuration
313and compilation changes or changes in portability/compatibility. However,
314changes within modules for platforms should generally be listed in the
315L</Modules and Pragmata> section.
bf1007bc 316
efdbe372 317=over 4
bf1007bc 318
228bfab9 319=item XXX-some-platform
bf1007bc 320
228bfab9 321XXX
0302547a 322
228bfab9 323=back
18940b1f 324
228bfab9 325=head1 Internal Changes
18940b1f 326
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327XXX Changes which affect the interface available to C<XS> code go here. Other
328significant internal changes for future core maintainers should be noted as
329well.
0302547a 330
228bfab9 331[ List each change as a =item entry ]
be2c0c65 332
efdbe372 333=over 4
0302547a 334
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335=item *
336
228bfab9 337XXX
0302547a 338
efdbe372 339=back
f54530a4 340
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341=head1 Selected Bug Fixes
342
343XXX Important bug fixes in the core language are summarized here. Bug fixes in
344files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
345
346[ List each fix as a =item entry ]
f54530a4 347
efdbe372 348=over 4
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349
350=item *
351
228bfab9 352XXX
4de751aa 353
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354=back
355
228bfab9 356=head1 Known Problems
0302547a 357
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358XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
359tests that had to be C<TODO>ed for the release would be noted here. Unfixed
360platform specific bugs also go here.
0302547a 361
228bfab9 362[ List each fix as a =item entry ]
f3285515 363
228bfab9 364=over 4
f3285515 365
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366=item *
367
228bfab9 368XXX
d60db39f 369
228bfab9 370=back
d60db39f 371
228bfab9 372=head1 Errata From Previous Releases
29002dbe 373
228bfab9 374=over 4
29002dbe 375
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376=item *
377
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378XXX Add anything here that we forgot to add, or were mistaken about, in
379the perldelta of a previous release.
d0971191 380
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381=back
382
228bfab9 383=head1 Obituary
90a4dab5 384
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385XXX If any significant core contributor has died, we've added a short obituary
386here.
90a4dab5 387
228bfab9 388=head1 Acknowledgements
90a4dab5 389
228bfab9 390XXX Generate this with:
90a4dab5 391
228bfab9 392 perl Porting/acknowledgements.pl v5.25.2..HEAD
f5b73711 393
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394=head1 Reporting Bugs
395
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396If you find what you think is a bug, you might check the perl bug database
397at L<https://rt.perl.org/> . There may also be information at
4b8803f0 398L<http://www.perl.org/> , the Perl Home Page.
44691e6f 399
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400If you believe you have an unreported bug, please run the L<perlbug> program
401included with your release. Be sure to trim your bug down to a tiny but
402sufficient test case. Your bug report, along with the output of C<perl -V>,
403will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
44691e6f 404
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405If the bug you are reporting has security implications which make it
406inappropriate to send to a publicly archived mailing list, then see
407L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
408for details of how to report the issue.
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409
410=head1 SEE ALSO
411
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412The F<Changes> file for an explanation of how to view exhaustive details on
413what changed.
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414
415The F<INSTALL> file for how to build Perl.
416
417The F<README> file for general stuff.
418
419The F<Artistic> and F<Copying> files for copyright information.
420
421=cut