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44691e6f AB |
1 | =encoding utf8 |
2 | ||
3 | =head1 NAME | |
4 | ||
fc4c3cec RS |
5 | [ this is a template for a new perldelta file. Any text flagged as XXX needs |
6 | to be processed before release. ] | |
7 | ||
8 | perldelta - what is new for perl v5.23.1 | |
eabfc7bc | 9 | |
2cfe9b50 | 10 | =head1 DESCRIPTION |
eabfc7bc | 11 | |
fc4c3cec | 12 | This document describes differences between the 5.23.0 release and the 5.23.1 |
2cfe9b50 | 13 | release. |
eabfc7bc | 14 | |
fc4c3cec RS |
15 | If you are upgrading from an earlier release such as 5.22.0, first read |
16 | L<perl5230delta>, which describes differences between 5.22.0 and 5.23.0. | |
17 | ||
18 | =head1 Notice | |
19 | ||
20 | XXX Any important notices here | |
21 | ||
2cfe9b50 | 22 | =head1 Core Enhancements |
eabfc7bc | 23 | |
fc4c3cec RS |
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. | |
ac71d2a0 | 27 | |
fc4c3cec | 28 | [ List each enhancement as a =head2 entry ] |
ac71d2a0 | 29 | |
deaaea8c JH |
30 | =head2 Integer shift (C<< << >> and C<< >> >>) now explicitly defined |
31 | ||
32 | Negative shifts are reverse shifts: left shift becomes right shift, | |
33 | and right shift becomes left shift. | |
34 | ||
35 | Shifting by the number of bits in a native integer (or more) is zero, | |
36 | except when the "overshift" is right shifting a negative value under | |
37 | C<use integer>, in which case the result is -1 (arithmetic shift). | |
38 | ||
39 | Until now negative shifting and overshifting have been undefined | |
40 | because they have relied on whatever the C implementation happens | |
41 | to do. For example, for the "overshift" a common behavior C is | |
42 | "modulo shift": | |
43 | ||
44 | 1 >> 64 == 1 >> (64 % 64) == 1 >> 0 == 1 # Common C behavior. | |
45 | ||
46 | # And the same for <<, while Perl now produces 0 for both. | |
47 | ||
48 | Now these behaviors are well-defined under Perl, regardless of what | |
49 | the underlying C implementation does. Note, however, that you cannot | |
50 | escape the native integer width. If you need more bits on the left shift, | |
51 | you could use the C<bigint> pragma. | |
52 | ||
7d380357 RS |
53 | =head2 Postfix dereferencing is no longer experimental |
54 | ||
55 | Using the C<postderef> and C<postderef_qq> features no longer emits a warning. | |
56 | Existing code that disables that warning category will continue to work. The | |
57 | C<5.24> feature bundle now includes those features. | |
58 | ||
fc4c3cec | 59 | =head1 Security |
2ad792cd | 60 | |
fc4c3cec RS |
61 | XXX Any security-related notices go here. In particular, any security |
62 | vulnerabilities closed should be noted here rather than in the | |
63 | L</Selected Bug Fixes> section. | |
64 | ||
65 | [ List each security issue as a =head2 entry ] | |
2ad792cd | 66 | |
2cfe9b50 | 67 | =head1 Incompatible Changes |
eabfc7bc | 68 | |
fc4c3cec | 69 | XXX For a release on a stable branch, this section aspires to be: |
33c28ab2 | 70 | |
fc4c3cec RS |
71 | There are no changes intentionally incompatible with 5.XXX.XXX |
72 | If any exist, they are bugs, and we request that you submit a | |
73 | report. See L</Reporting Bugs> below. | |
eabfc7bc | 74 | |
fc4c3cec | 75 | [ List each incompatible change as a =head2 entry ] |
eabfc7bc | 76 | |
fc4c3cec | 77 | =head1 Deprecations |
eabfc7bc | 78 | |
fc4c3cec | 79 | XXX Any deprecated features, syntax, modules etc. should be listed here. |
eabfc7bc | 80 | |
fc4c3cec RS |
81 | =head2 Module removals |
82 | ||
83 | XXX Remove this section if inapplicable. | |
84 | ||
85 | The following modules will be removed from the core distribution in a | |
86 | future release, and will at that time need to be installed from CPAN. | |
87 | Distributions on CPAN which require these modules will need to list them as | |
88 | prerequisites. | |
89 | ||
90 | The core versions of these modules will now issue C<"deprecated">-category | |
91 | warnings to alert you to this fact. To silence these deprecation warnings, | |
92 | install the modules in question from CPAN. | |
93 | ||
94 | Note that these are (with rare exceptions) fine modules that you are encouraged | |
95 | to continue to use. Their disinclusion from core primarily hinges on their | |
96 | necessity to bootstrapping a fully functional, CPAN-capable Perl installation, | |
97 | not usually on concerns over their design. | |
98 | ||
99 | =over | |
100 | ||
101 | =item XXX | |
102 | ||
103 | XXX Note that deprecated modules should be listed here even if they are listed | |
104 | as an updated module in the L</Modules and Pragmata> section. | |
105 | ||
106 | =back | |
107 | ||
108 | [ List each other deprecation as a =head2 entry ] | |
109 | ||
110 | =head1 Performance Enhancements | |
111 | ||
112 | XXX Changes which enhance performance without changing behaviour go here. | |
113 | There may well be none in a stable release. | |
114 | ||
115 | [ List each enhancement as a =item entry ] | |
eabfc7bc | 116 | |
73d6481e | 117 | =over 4 |
eabfc7bc | 118 | |
73d6481e | 119 | =item * |
eabfc7bc | 120 | |
fc4c3cec | 121 | XXX |
eabfc7bc | 122 | |
fc4c3cec | 123 | =back |
eabfc7bc | 124 | |
fc4c3cec | 125 | =head1 Modules and Pragmata |
eabfc7bc | 126 | |
fc4c3cec RS |
127 | XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/> |
128 | go here. If Module::CoreList is updated, generate an initial draft of the | |
129 | following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary | |
130 | for important changes should then be added by hand. In an ideal world, | |
131 | dual-life modules would have a F<Changes> file that could be cribbed. | |
eabfc7bc | 132 | |
fc4c3cec | 133 | [ Within each section, list entries as a =item entry ] |
eabfc7bc | 134 | |
fc4c3cec | 135 | =head2 New Modules and Pragmata |
eabfc7bc | 136 | |
fc4c3cec | 137 | =over 4 |
eabfc7bc | 138 | |
73d6481e | 139 | =item * |
eabfc7bc | 140 | |
fc4c3cec | 141 | XXX |
eabfc7bc | 142 | |
fc4c3cec | 143 | =back |
eabfc7bc | 144 | |
fc4c3cec RS |
145 | =head2 Updated Modules and Pragmata |
146 | ||
147 | =over 4 | |
eabfc7bc RS |
148 | |
149 | =item * | |
150 | ||
c85f23b2 DD |
151 | L<IPC::Open3> has been upgraded from version 1.18 to 1.19. |
152 | ||
153 | If a Perl exception was thrown from inside this module, the exception | |
154 | C<IPC::Open3> threw to the callers of C<open3> would have an irrelavent | |
155 | message derived from C<$!> which was in an undefined state, instead of the | |
156 | C<$@> message which triggers the failure path inside C<open3>. | |
eabfc7bc | 157 | |
fc4c3cec RS |
158 | =back |
159 | ||
160 | =head2 Removed Modules and Pragmata | |
eabfc7bc | 161 | |
fc4c3cec | 162 | =over 4 |
374c951f SH |
163 | |
164 | =item * | |
165 | ||
fc4c3cec | 166 | XXX |
e586de20 | 167 | |
fc4c3cec | 168 | =back |
e586de20 | 169 | |
fc4c3cec | 170 | =head1 Documentation |
fd0a842f | 171 | |
fc4c3cec RS |
172 | XXX Changes to files in F<pod/> go here. Consider grouping entries by |
173 | file and be sure to link to the appropriate page, e.g. L<perlfunc>. | |
fd0a842f | 174 | |
fc4c3cec | 175 | =head2 New Documentation |
99527ef1 | 176 | |
fc4c3cec | 177 | XXX Changes which create B<new> files in F<pod/> go here. |
99527ef1 | 178 | |
fc4c3cec | 179 | =head3 L<XXX> |
a4f8ff46 | 180 | |
fc4c3cec | 181 | XXX Description of the purpose of the new file here |
a4f8ff46 | 182 | |
fc4c3cec | 183 | =head2 Changes to Existing Documentation |
73d6481e | 184 | |
fc4c3cec RS |
185 | XXX Changes which significantly change existing files in F<pod/> go here. |
186 | However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics> | |
187 | section. | |
188 | ||
189 | =head3 L<XXX> | |
73d6481e | 190 | |
fc4c3cec | 191 | =over 4 |
eabfc7bc RS |
192 | |
193 | =item * | |
194 | ||
fc4c3cec | 195 | XXX Description of the change here |
b7b593d8 | 196 | |
fc4c3cec | 197 | =back |
b7b593d8 | 198 | |
fc4c3cec | 199 | =head1 Diagnostics |
b7b593d8 | 200 | |
fc4c3cec RS |
201 | The following additions or changes have been made to diagnostic output, |
202 | including warnings and fatal error messages. For the complete list of | |
203 | diagnostic messages, see L<perldiag>. | |
b7b593d8 | 204 | |
fc4c3cec RS |
205 | XXX New or changed warnings emitted by the core's C<C> code go here. Also |
206 | include any changes in L<perldiag> that reconcile it to the C<C> code. | |
b7b593d8 | 207 | |
fc4c3cec | 208 | =head2 New Diagnostics |
b7b593d8 | 209 | |
fc4c3cec RS |
210 | XXX Newly added diagnostic messages go under here, separated into New Errors |
211 | and New Warnings | |
b7b593d8 | 212 | |
fc4c3cec RS |
213 | =head3 New Errors |
214 | ||
215 | =over 4 | |
eabfc7bc | 216 | |
ef5cf9f5 TC |
217 | =item * |
218 | ||
fc4c3cec | 219 | XXX L<message|perldiag/"message"> |
72b8c7a2 | 220 | |
fc4c3cec | 221 | =back |
72b8c7a2 | 222 | |
fc4c3cec RS |
223 | =head3 New Warnings |
224 | ||
225 | =over 4 | |
bdb6acef SH |
226 | |
227 | =item * | |
228 | ||
fc4c3cec | 229 | XXX L<message|perldiag/"message"> |
ef5cf9f5 | 230 | |
fc4c3cec | 231 | =back |
3d58dd24 | 232 | |
fc4c3cec RS |
233 | =head2 Changes to Existing Diagnostics |
234 | ||
235 | XXX Changes (i.e. rewording) of diagnostic messages go here | |
236 | ||
237 | =over 4 | |
4b951711 TC |
238 | |
239 | =item * | |
240 | ||
fc4c3cec | 241 | XXX Describe change here |
eabfc7bc | 242 | |
fc4c3cec | 243 | =back |
eabfc7bc | 244 | |
fc4c3cec | 245 | =head1 Utility Changes |
eabfc7bc | 246 | |
fc4c3cec RS |
247 | XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here. |
248 | Most of these are built within the directory F<utils>. | |
eabfc7bc | 249 | |
fc4c3cec RS |
250 | [ List utility changes as a =head2 entry for each utility and =item |
251 | entries for each change | |
252 | Use L<XXX> with program names to get proper documentation linking. ] | |
eabfc7bc | 253 | |
fc4c3cec RS |
254 | =head2 L<XXX> |
255 | ||
256 | =over 4 | |
eabfc7bc RS |
257 | |
258 | =item * | |
259 | ||
fc4c3cec | 260 | XXX |
eabfc7bc | 261 | |
fc4c3cec | 262 | =back |
eabfc7bc | 263 | |
fc4c3cec | 264 | =head1 Configuration and Compilation |
eabfc7bc | 265 | |
fc4c3cec RS |
266 | XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools |
267 | go here. Any other changes to the Perl build process should be listed here. | |
268 | However, any platform-specific changes should be listed in the | |
269 | L</Platform Support> section, instead. | |
eabfc7bc | 270 | |
fc4c3cec | 271 | [ List changes as a =item entry ]. |
eabfc7bc | 272 | |
fc4c3cec | 273 | =over 4 |
eabfc7bc RS |
274 | |
275 | =item * | |
276 | ||
fc4c3cec | 277 | XXX |
eabfc7bc | 278 | |
fc4c3cec | 279 | =back |
eabfc7bc | 280 | |
fc4c3cec | 281 | =head1 Testing |
eabfc7bc | 282 | |
fc4c3cec RS |
283 | XXX Any significant changes to the testing of a freshly built perl should be |
284 | listed here. Changes which create B<new> files in F<t/> go here as do any | |
285 | large changes to the testing harness (e.g. when parallel testing was added). | |
286 | Changes to existing files in F<t/> aren't worth summarizing, although the bugs | |
287 | that they represent may be covered elsewhere. | |
288 | ||
289 | [ List each test improvement as a =item entry ] | |
290 | ||
291 | =over 4 | |
eabfc7bc | 292 | |
fc4c3cec | 293 | =item * |
eabfc7bc | 294 | |
fc4c3cec | 295 | XXX |
eabfc7bc | 296 | |
2cfe9b50 | 297 | =back |
33ca8d3c | 298 | |
73d6481e | 299 | =head1 Platform Support |
eabfc7bc | 300 | |
fc4c3cec | 301 | XXX Any changes to platform support should be listed in the sections below. |
eabfc7bc | 302 | |
fc4c3cec RS |
303 | [ Within the sections, list each platform as a =item entry with specific |
304 | changes as paragraphs below it. ] | |
eabfc7bc | 305 | |
fc4c3cec | 306 | =head2 New Platforms |
42fe7840 | 307 | |
fc4c3cec RS |
308 | XXX List any platforms that this version of perl compiles on, that previous |
309 | versions did not. These will either be enabled by new files in the F<hints/> | |
310 | directories, or new subdirectories and F<README> files at the top level of the | |
311 | source tree. | |
312 | ||
313 | =over 4 | |
42fe7840 | 314 | |
fc4c3cec RS |
315 | =item XXX-some-platform |
316 | ||
317 | XXX | |
42fe7840 CB |
318 | |
319 | =back | |
320 | ||
fc4c3cec | 321 | =head2 Discontinued Platforms |
eabfc7bc | 322 | |
fc4c3cec | 323 | XXX List any platforms that this version of perl no longer compiles on. |
269713a1 | 324 | |
fc4c3cec | 325 | =over 4 |
269713a1 | 326 | |
fc4c3cec | 327 | =item XXX-some-platform |
269713a1 | 328 | |
fc4c3cec | 329 | XXX |
463e63a4 | 330 | |
fc4c3cec | 331 | =back |
463e63a4 | 332 | |
fc4c3cec | 333 | =head2 Platform-Specific Notes |
9c0328ac | 334 | |
fc4c3cec RS |
335 | XXX List any changes for specific platforms. This could include configuration |
336 | and compilation changes or changes in portability/compatibility. However, | |
337 | changes within modules for platforms should generally be listed in the | |
338 | L</Modules and Pragmata> section. | |
9c0328ac | 339 | |
fc4c3cec RS |
340 | =over 4 |
341 | ||
7d380357 | 342 | =item VMS |
fc4c3cec | 343 | |
7d380357 RS |
344 | =over |
345 | ||
346 | =item * | |
347 | ||
348 | The minimum supported version of VMS is now v7.3-2, released in 2003. As a | |
349 | side effect of this change, VAX is no longer supported as the terminal | |
350 | release of OpenVMS VAX was v7.3 in 2001. | |
351 | ||
352 | =back | |
eabfc7bc | 353 | |
2cfe9b50 | 354 | =back |
eabfc7bc | 355 | |
fc4c3cec RS |
356 | =head1 Internal Changes |
357 | ||
358 | XXX Changes which affect the interface available to C<XS> code go here. Other | |
359 | significant internal changes for future core maintainers should be noted as | |
360 | well. | |
361 | ||
362 | [ List each change as a =item entry ] | |
eabfc7bc | 363 | |
2cfe9b50 | 364 | =over 4 |
eabfc7bc RS |
365 | |
366 | =item * | |
367 | ||
fc4c3cec | 368 | XXX |
eabfc7bc | 369 | |
fc4c3cec | 370 | =back |
302ef3d4 | 371 | |
fc4c3cec | 372 | =head1 Selected Bug Fixes |
302ef3d4 | 373 | |
fc4c3cec RS |
374 | XXX Important bug fixes in the core language are summarized here. Bug fixes in |
375 | files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>. | |
eabfc7bc | 376 | |
fc4c3cec RS |
377 | [ List each fix as a =item entry ] |
378 | ||
379 | =over 4 | |
eabfc7bc | 380 | |
73d6481e | 381 | =item * |
eabfc7bc | 382 | |
7ed1d857 DD |
383 | A leak in the XS typemap caused one scalar to be leaked each time a C<FILE *> |
384 | or a C<PerlIO *> was C<OUTPUT:>ed or imported to Perl, since perl 5.000. These | |
385 | particular typemap entries are thought to be extremely rarely used by XS | |
386 | modules. [perl #124181] | |
eabfc7bc | 387 | |
fc4c3cec RS |
388 | =back |
389 | ||
390 | =head1 Known Problems | |
391 | ||
392 | XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any | |
393 | tests that had to be C<TODO>ed for the release would be noted here. Unfixed | |
394 | platform specific bugs also go here. | |
395 | ||
396 | [ List each fix as a =item entry ] | |
eabfc7bc | 397 | |
fc4c3cec RS |
398 | =over 4 |
399 | ||
400 | =item * | |
eabfc7bc | 401 | |
fc4c3cec | 402 | XXX |
eabfc7bc | 403 | |
73d6481e | 404 | =back |
eabfc7bc | 405 | |
fc4c3cec | 406 | =head1 Errata From Previous Releases |
eabfc7bc | 407 | |
fc4c3cec | 408 | =over 4 |
eabfc7bc | 409 | |
fc4c3cec | 410 | =item * |
2a7a05b4 | 411 | |
fc4c3cec RS |
412 | XXX Add anything here that we forgot to add, or were mistaken about, in |
413 | the perldelta of a previous release. | |
30aa8e3f | 414 | |
fc4c3cec | 415 | =back |
30aa8e3f | 416 | |
fc4c3cec RS |
417 | =head1 Obituary |
418 | ||
419 | XXX If any significant core contributor has died, we've added a short obituary | |
420 | here. | |
421 | ||
422 | =head1 Acknowledgements | |
2a7a05b4 | 423 | |
fc4c3cec | 424 | XXX Generate this with: |
2cfe9b50 | 425 | |
fc4c3cec | 426 | perl Porting/acknowledgements.pl v5.23.1..HEAD |
f5b73711 | 427 | |
44691e6f AB |
428 | =head1 Reporting Bugs |
429 | ||
e08634c5 SH |
430 | If you find what you think is a bug, you might check the articles recently |
431 | posted to the comp.lang.perl.misc newsgroup and the perl bug database at | |
fc4c3cec RS |
432 | L<https://rt.perl.org/> . There may also be information at |
433 | L<http://www.perl.org/> , the Perl Home Page. | |
44691e6f | 434 | |
e08634c5 SH |
435 | If you believe you have an unreported bug, please run the L<perlbug> program |
436 | included with your release. Be sure to trim your bug down to a tiny but | |
437 | sufficient test case. Your bug report, along with the output of C<perl -V>, | |
438 | will be sent off to perlbug@perl.org to be analysed by the Perl porting team. | |
44691e6f AB |
439 | |
440 | If the bug you are reporting has security implications, which make it | |
e08634c5 SH |
441 | inappropriate to send to a publicly archived mailing list, then please send it |
442 | to perl5-security-report@perl.org. This points to a closed subscription | |
443 | unarchived mailing list, which includes all the core committers, who will be | |
444 | able to help assess the impact of issues, figure out a resolution, and help | |
f9001595 | 445 | co-ordinate the release of patches to mitigate or fix the problem across all |
e08634c5 SH |
446 | platforms on which Perl is supported. Please only use this address for |
447 | security issues in the Perl core, not for modules independently distributed on | |
448 | CPAN. | |
44691e6f AB |
449 | |
450 | =head1 SEE ALSO | |
451 | ||
e08634c5 SH |
452 | The F<Changes> file for an explanation of how to view exhaustive details on |
453 | what changed. | |
44691e6f AB |
454 | |
455 | The F<INSTALL> file for how to build Perl. | |
456 | ||
457 | The F<README> file for general stuff. | |
458 | ||
459 | The F<Artistic> and F<Copying> files for copyright information. | |
460 | ||
461 | =cut |