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Add the correct PL_sig_ignoring skip for VMS in makedef.pl.
[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
6XXX needs to be processed before release. ]
f5938650 7
5438d4b8 8perldelta - what is new for perl v5.15.2
760696b8 9
5438d4b8 10=head1 DESCRIPTION
5cd408a2 11
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12This document describes differences between the 5.15.1 release and
13the 5.15.2 release.
5cd408a2 14
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15If you are upgrading from an earlier release such as 5.15.0, first read
16L<perl5151delta>, which describes differences between 5.15.0 and
175.15.1.
062678b2 18
5438d4b8 19=head1 Notice
062678b2 20
5438d4b8 21XXX Any important notices here
4185c919 22
5438d4b8 23=head1 Core Enhancements
4185c919 24
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25XXX New core language features go here. Summarise user-visible core language
26enhancements. Particularly prominent performance optimisations could go
27here, but most should go in the L</Performance Enhancements> section.
82aed44a 28
5438d4b8 29[ List each enhancement as a =head2 entry ]
82aed44a 30
5438d4b8 31=head1 Security
2b679393 32
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33XXX Any security-related notices go here. In particular, any security
34vulnerabilities closed should be noted here rather than in the
35L</Selected Bug Fixes> section.
2b679393 36
5438d4b8 37[ List each security issue as a =head2 entry ]
7818c927 38
5438d4b8 39=head1 Incompatible Changes
7818c927 40
5438d4b8 41XXX For a release on a stable branch, this section aspires to be:
760696b8 42
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43 There are no changes intentionally incompatible with 5.XXX.XXX
44 If any exist, they are bugs and reports are welcome.
6693394d 45
5438d4b8 46[ List each incompatible change as a =head2 entry ]
6693394d 47
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48=head2 C<UNIVERSAL::VERSION> now returns $VERSION
49
50C<UNIVERSAL::VERSION> now return whatever is in $VERSION, instead of
51returning $VERSION converted to a version object and then to a string.
52As a result, it no longer parses the version when called without arguments,
53so it no longer dies in that case for malformed versions. This allows
54custom version number parsers to use C<< ->VERSION >> to retrieve the
55version number, as was the case in Perl 5.8 [perl #95544].
56
5438d4b8 57=head1 Deprecations
92c695db 58
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59XXX Any deprecated features, syntax, modules etc. should be listed here.
60In particular, deprecated modules should be listed here even if they are
61listed as an updated module in the L</Modules and Pragmata> section.
92c695db 62
5438d4b8 63[ List each deprecation as a =head2 entry ]
6693394d 64
5438d4b8 65=head1 Performance Enhancements
bfafcb9a 66
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67XXX Changes which enhance performance without changing behaviour go here. There
68may well be none in a stable release.
bfafcb9a 69
5438d4b8 70[ List each enhancement as a =item entry ]
72de20cd 71
5438d4b8 72=over 4
72de20cd 73
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74=item *
75
5438d4b8 76XXX
93905212 77
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78=back
79
0890f1a5 80=head1 Modules and Pragmata
bdb9ba77 81
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82XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
83go here. If Module::CoreList is updated, generate an initial draft of the
84following sections using F<Porting/corelist-perldelta.pl>, which prints stub
85entries to STDOUT. Results can be pasted in place of the '=head2' entries
86below. A paragraph summary for important changes should then be added by hand.
87In an ideal world, dual-life modules would have a F<Changes> file that could be
88cribbed.
89
90[ Within each section, list entries as a =item entry ]
91
0890f1a5 92=head2 New Modules and Pragmata
6693394d 93
0890f1a5 94=over 4
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95
96=item *
97
5438d4b8 98XXX
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99
100=back
101
0890f1a5 102=head2 Updated Modules and Pragmata
760696b8 103
0890f1a5 104=over 4
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105
106=item *
107
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108L<CPANPLUS> has been upgraded from version 0.9108 to version 0.9109
109
110Fixed support for v-strings and x.y.z versions with v5.8.4
111
112=item *
113
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114L<ExtUtils::Install> has been upgraded from version 1.56 to version 1.57.
115
116There is no change to ExtUtils::Install other than the version number
117increase, but L<ExtUtils::Installed> has been upgraded from version 1.999_001
c493c0a1 118to version 1.999002 and a new C<skip_cwd> attribute has been added.
259925f6 119
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120=item *
121
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122L<IPC::Open3> has been upgraded from version 1.11 to 1.12.
123
124C<open3> with "-" for the program name works once more. This was broken in
125version 1.06 (and hence in Perl 5.14.0) [perl #95748].
126
127=item *
128
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129L<Module::Build> has been upgraded from version 0.3800 to version 0.39_01.
130
131Pod to HTML internals changed to support revisions to Pod::Html in core.
132Also fixes some minor bugs. [rt.cpan.org #68585] [rt.cpan.org #67893]
133[rt.cpan.org #67008]
134
135=item *
136
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137L<Module::Load> has been upgraded from version 0.18 to version 0.20
138
139=item *
140
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141L<Params::Check> has been upgraded from version 0.28 to version 0.30
142
143=item *
144
5213914c 145L<PerlIO::via> has been upgraded from version 0.11 to version 0.12.
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146
147The only change is a correction in the documentation.
148
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149=item *
150
151L<Term::ANSIColor> has been upgraded from version 3.00 to version 3.01
152
153Only interpret an initial array reference as a list of colors, not any initial
154reference, allowing the colored function to work properly on objects with
155stringification defined.
156
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157=item *
158
159L<Unicode::Collate> has been upgraded from version 0.77 to version 0.78
160
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161=item *
162
163L<Unicode::Normalize> has been upgraded from version 1.12 to version 1.13
164
5438d4b8 165=back
77ccfaeb 166
5438d4b8 167=head2 Removed Modules and Pragmata
508236ce 168
5438d4b8 169=over 4
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170
171=item *
172
5438d4b8 173XXX
c69a30ec 174
5438d4b8 175=back
c69a30ec 176
5438d4b8 177=head1 Documentation
c69a30ec 178
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179XXX Changes to files in F<pod/> go here. Consider grouping entries by
180file and be sure to link to the appropriate page, e.g. L<perlfunc>.
7c420290 181
5438d4b8 182=head2 New Documentation
7c420290 183
5438d4b8 184XXX Changes which create B<new> files in F<pod/> go here.
0cb4637e 185
5438d4b8 186=head3 L<XXX>
7818c927 187
5438d4b8 188XXX Description of the purpose of the new file here
7818c927 189
5438d4b8 190=head2 Changes to Existing Documentation
dd413713 191
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192XXX Changes which significantly change existing files in F<pod/> go here.
193However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
194section.
7818c927 195
5438d4b8 196=head3 L<XXX>
7818c927 197
5438d4b8 198=over 4
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199
200=item *
201
5438d4b8 202XXX Description of the change here
5aeca1f7 203
5438d4b8 204=back
5aeca1f7 205
5438d4b8 206=head1 Diagnostics
0cb4637e 207
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208The following additions or changes have been made to diagnostic output,
209including warnings and fatal error messages. For the complete list of
210diagnostic messages, see L<perldiag>.
0cb4637e 211
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212XXX New or changed warnings emitted by the core's C<C> code go here. Also
213include any changes in L<perldiag> that reconcile it to the C<C> code.
00f02a57 214
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215[ Within each section, list entries as a =item entry that links to perldiag,
216 e.g.
00f02a57 217
5438d4b8 218 =item *
00f02a57 219
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220 L<Invalid version object|perldiag/"Invalid version object">
221]
8b00e523 222
5438d4b8 223=head2 New Diagnostics
4abaf918 224
5438d4b8 225XXX Newly added diagnostic messages go here
4abaf918 226
5438d4b8 227=head3 New Errors
4abaf918 228
5438d4b8 229=over 4
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230
231=item *
232
5438d4b8 233XXX L<message|perldiag/"message">
8b00e523 234
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235=back
236
5438d4b8 237=head3 New Warnings
bdb9ba77 238
0890f1a5 239=over 4
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240
241=item *
242
5438d4b8 243XXX L<message|perldiag/"message">
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244
245=back
246
5438d4b8 247=head2 Changes to Existing Diagnostics
7818c927 248
5438d4b8 249XXX Changes (i.e. rewording) of diagnostic messages go here
0890f1a5 250
0890f1a5 251=over 4
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252
253=item *
254
5438d4b8 255XXX Describe change here
259925f6 256
5438d4b8 257=back
7818c927 258
5438d4b8 259=head1 Utility Changes
7818c927 260
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261XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go
262here. Most of these are built within the directories F<utils> and F<x2p>.
7818c927 263
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264[ List utility changes as a =head3 entry for each utility and =item
265entries for each change
266Use L<XXX> with program names to get proper documentation linking. ]
7818c927 267
71449ad0 268=head3 L<perlivp>
b908e258 269
5438d4b8 270=over 4
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271
272=item *
273
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274Fixed a bug whereby other perls under the current directory could cause
275false positive failures.
276
277=item *
278
279Tests for .ph files have been removed, as these test have been optional since
2802005 and .ph files are no longer generated during installation.
b908e258 281
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282=back
283
5438d4b8 284=head1 Configuration and Compilation
b7188eb5 285
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286XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
287go here. Any other changes to the Perl build process should be listed here.
288However, any platform-specific changes should be listed in the
289L</Platform Support> section, instead.
44691e6f 290
5438d4b8 291[ List changes as a =item entry ].
42a91c97 292
34dc2ec0 293=over 4
42a91c97 294
6693394d 295=item *
42a91c97 296
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297F<makedef.pl> has been refactored. This should have no noticeable affect on
298any of the platforms that use it as part of their build (AIX, VMS, Win32).
42a91c97 299
34dc2ec0 300=back
42a91c97 301
0890f1a5 302=head1 Testing
bdab33d1 303
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304XXX Any significant changes to the testing of a freshly built perl should be
305listed here. Changes which create B<new> files in F<t/> go here as do any
306large changes to the testing harness (e.g. when parallel testing was added).
307Changes to existing files in F<t/> aren't worth summarising, although the bugs
308that they represent may be covered elsewhere.
f5938650 309
5438d4b8 310[ List each test improvement as a =item entry ]
1fcb0052 311
5438d4b8 312=over 4
1fcb0052 313
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314=item *
315
5438d4b8 316XXX
b908e258 317
f5938650 318=back
2fbb14a0 319
0890f1a5 320=head1 Platform Support
975dff8c 321
5438d4b8 322XXX Any changes to platform support should be listed in the sections below.
6693394d 323
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324[ Within the sections, list each platform as a =item entry with specific
325changes as paragraphs below it. ]
6693394d 326
5438d4b8 327=head2 New Platforms
1fcb0052 328
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329XXX List any platforms that this version of perl compiles on, that previous
330versions did not. These will either be enabled by new files in the F<hints/>
331directories, or new subdirectories and F<README> files at the top level of the
332source tree.
6693394d 333
0890f1a5 334=over 4
f5938650 335
5438d4b8 336=item XXX-some-platform
c62f68e3 337
5438d4b8 338XXX
f5938650 339
0890f1a5 340=back
25aa614d 341
5438d4b8 342=head2 Discontinued Platforms
87d00a71 343
5438d4b8 344XXX List any platforms that this version of perl no longer compiles on.
87d00a71 345
5438d4b8 346=over 4
da507230 347
5438d4b8 348=item XXX-some-platform
fff96ff7 349
5438d4b8 350XXX
da507230 351
5438d4b8 352=back
bb3abb05 353
5438d4b8 354=head2 Platform-Specific Notes
d25b0d7b 355
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356XXX List any changes for specific platforms. This could include configuration
357and compilation changes or changes in portability/compatibility. However,
358changes within modules for platforms should generally be listed in the
359L</Modules and Pragmata> section.
d25b0d7b 360
5438d4b8 361=over 4
4bee03f8 362
5438d4b8 363=item XXX-some-platform
4bee03f8 364
5438d4b8 365XXX
d9463c66 366
5438d4b8 367=back
d9463c66 368
5438d4b8 369=head1 Internal Changes
7c4c6e7c 370
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371XXX Changes which affect the interface available to C<XS> code go here.
372Other significant internal changes for future core maintainers should
373be noted as well.
7c4c6e7c 374
5438d4b8 375[ List each change as a =item entry ]
777d9014 376
5438d4b8 377=over 4
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378
379=item *
380
5438d4b8 381XXX
df5b44bd 382
5438d4b8 383=back
df5b44bd 384
5438d4b8 385=head1 Selected Bug Fixes
e22e289d 386
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387XXX Important bug fixes in the core language are summarised here.
388Bug fixes in files in F<ext/> and F<lib/> are best summarised in
389L</Modules and Pragmata>.
7818c927 390
5438d4b8 391[ List each fix as a =item entry ]
7818c927 392
5438d4b8 393=over 4
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394
395=item *
396
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397Locking an lvalue subroutine (via C<lock &lvsub>) now locks the return
398value, instead of trying to lock the sub (which has no effect). It also no
399longer tries to return the sub as a scalar, resulting in strange side
400effects like C<ref \$_> returning "CODE" in some instances.
7818c927 401
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402=item *
403
404C<lock>'s prototype has been corrected to C<(\[$@%*])> from C<(\$)>, which
405was just wrong.
406
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407=item *
408
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409The prototypes for the core functions C<stat> and C<lstat> have been
410removed, as they were incorrect, because their syntax cannot be replicated
411by Perl subroutines.
412
413=item *
414
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415Most dereferencing operators (C<${}>, etc.) used to call C<FETCH> twice on
416a tied operand when doing a symbolic dereference (looking up a variable by
417name, which is not permitted under C<use strict 'refs'>). Only C<&{}> did
418not have this problem. This has been fixed.
419
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420=item *
421
422A minor regression introduced in 5.15.0 has been fixed. Dereferencing a
423magical mortal (e.g., the return value of C<delete> on a tied hash element)
424explicitly returned from a subroutine called recursively was not calling
425C<FETCH>. This would affect code like C<@{ foo() }> where the C<foo> sub
426contains C<return delete $hash{elem}> and is calling itself.
427
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428=item *
429
430A panic involving the combination of the regular expression modifiers
431C</aa> and the C<\b> escape sequence introduced in 5.14.0 has been
432fixed [perl #95964].
433
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434=item *
435
436stat() would always return the inode number as an IV, even when the
437original was unsigned, or too large to fit in an IV. stat() now
438returns the inode number as the type that would best preserve the
439original value. [perl #84590]
440
5438d4b8 441=back
c62f68e3 442
5438d4b8 443=head1 Known Problems
c62f68e3 444
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445XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
446tests that had to be C<TODO>ed for the release would be noted here, unless
447they were specific to a particular platform (see below).
c62f68e3 448
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449This is a list of some significant unfixed bugs, which are regressions
450from either 5.XXX.XXX or 5.XXX.XXX.
e22e289d 451
5438d4b8 452[ List each fix as a =item entry ]
e22e289d 453
5438d4b8 454=over 4
e22e289d 455
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456=item *
457
5438d4b8 458XXX
4ec40670 459
5438d4b8 460=back
4ec40670 461
5438d4b8 462=head1 Obituary
b908e258 463
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464XXX If any significant core contributor has died, we've added a short obituary
465here.
42a91c97 466
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467=head1 Acknowledgements
468
f1c1ecab 469XXX Generate this with:
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470
471 perl Porting/acknowledgements.pl v5.15.1..HEAD
29cf780c 472
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473=head1 Reporting Bugs
474
475If you find what you think is a bug, you might check the articles
34dc2ec0 476recently posted to the comp.lang.perl.misc newsgroup and the perl
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477bug database at http://rt.perl.org/perlbug/ . There may also be
478information at http://www.perl.org/ , the Perl Home Page.
479
480If you believe you have an unreported bug, please run the L<perlbug>
481program included with your release. Be sure to trim your bug down
482to a tiny but sufficient test case. Your bug report, along with the
483output of C<perl -V>, will be sent off to perlbug@perl.org to be
484analysed by the Perl porting team.
485
486If the bug you are reporting has security implications, which make it
487inappropriate to send to a publicly archived mailing list, then please send
34dc2ec0 488it to perl5-security-report@perl.org. This points to a closed subscription
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489unarchived mailing list, which includes
490all the core committers, who will be able
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491to help assess the impact of issues, figure out a resolution, and help
492co-ordinate the release of patches to mitigate or fix the problem across all
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493platforms on which Perl is supported. Please only use this address for
494security issues in the Perl core, not for modules independently
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495distributed on CPAN.
496
497=head1 SEE ALSO
498
499The F<Changes> file for an explanation of how to view exhaustive details
500on what changed.
501
502The F<INSTALL> file for how to build Perl.
503
504The F<README> file for general stuff.
505
506The F<Artistic> and F<Copying> files for copyright information.
507
508=cut