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44691e6f AB |
1 | =encoding utf8 |
2 | ||
3 | =head1 NAME | |
4 | ||
7065301c 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 v5.21.1 | |
c68523cb | 9 | |
238894db | 10 | =head1 DESCRIPTION |
c68523cb | 11 | |
7065301c | 12 | This document describes differences between the 5.21.0 release and the 5.21.1 |
238894db | 13 | release. |
c68523cb | 14 | |
7065301c RS |
15 | If you are upgrading from an earlier release such as 5.20.0, first read |
16 | L<perl5210delta>, which describes differences between 5.20.0 and 5.21.0. | |
17 | ||
18 | =head1 Notice | |
19 | ||
20 | XXX Any important notices here | |
21 | ||
22 | =head1 Core Enhancements | |
23 | ||
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. | |
27 | ||
28 | [ List each enhancement as a =head2 entry ] | |
29 | ||
8373491a KW |
30 | =head2 C<qr/foo/x> now ignores any Unicode pattern white space |
31 | ||
32 | The C</x> regular expression modifier allows the pattern to contain | |
33 | white space and comments, both of which are ignored, for improved | |
34 | readability. Until now, not all the white space characters that Unicode | |
35 | designates for this purpose were handled. The additional ones now | |
36 | recognized are | |
37 | U+0085 NEXT LINE, | |
38 | U+200E LEFT-TO-RIGHT MARK, | |
39 | U+200F RIGHT-TO-LEFT MARK, | |
40 | U+2028 LINE SEPARATOR, | |
41 | and | |
42 | U+2029 PARAGRAPH SEPARATOR. | |
43 | ||
7065301c RS |
44 | =head1 Security |
45 | ||
46 | XXX Any security-related notices go here. In particular, any security | |
47 | vulnerabilities closed should be noted here rather than in the | |
48 | L</Selected Bug Fixes> section. | |
49 | ||
50 | [ List each security issue as a =head2 entry ] | |
51 | ||
52 | =head1 Incompatible Changes | |
53 | ||
54 | XXX For a release on a stable branch, this section aspires to be: | |
55 | ||
56 | There are no changes intentionally incompatible with 5.XXX.XXX | |
57 | If any exist, they are bugs, and we request that you submit a | |
58 | report. See L</Reporting Bugs> below. | |
59 | ||
7357bd17 KW |
60 | =head2 In double-quotish C<\cI<X>>, I<X> must now be a printable ASCII character |
61 | ||
62 | In prior releases, failure to do this raised a deprecation warning. | |
7065301c | 63 | |
cd209d9d KW |
64 | =head2 Splitting the tokens C<(?> and C<(*> in regular expressions is |
65 | now a fatal compilation error. | |
66 | ||
67 | These had been deprecated since v5.18. | |
68 | ||
8373491a KW |
69 | =head2 5 additional characters are treated as white space under C</x> in |
70 | regex patterns (unless escaped) | |
71 | ||
72 | The use of these characters with C</x> outside bracketed character | |
73 | classes and when not preceeded by a backslash has raised a deprecation | |
74 | warning since v5.18. Now they will be ignored. See L</qrE<sol>fooE<sol>x> | |
75 | for the list of the five characters. | |
76 | ||
77 | =head2 Comment lines within S<C<(?[ ])>> now are ended only by a C<\n> | |
78 | ||
79 | S<C<(?[ ])>> is an experimental feature, introduced in v5.18. It operates | |
80 | as if C</x> is always enabled. But there was a difference, comment | |
81 | lines (following a C<#> character) were terminated by anything matching | |
82 | C<\R> which includes all vertical whitespace, such as form feeds. For | |
83 | consistency, this is now changed to match what terminates comment lines | |
84 | outside S<C<(?[ ])>>, namely a C<\n> (even if escaped), which is the | |
85 | same as what terminates a heredoc string and formats. | |
86 | ||
7065301c RS |
87 | =head1 Deprecations |
88 | ||
89 | XXX Any deprecated features, syntax, modules etc. should be listed here. | |
90 | ||
df758df2 KW |
91 | =head2 Using a NO-BREAK space in a character alias for C<\N{...}> is now |
92 | deprecated | |
93 | ||
94 | This non-graphic character is essentially indistinguishable from a | |
95 | regular space, and so should not be allowed. See | |
96 | L<charnames/CUSTOM ALIASES>. | |
97 | ||
7065301c RS |
98 | =head2 Module removals |
99 | ||
100 | XXX Remove this section if inapplicable. | |
101 | ||
102 | The following modules will be removed from the core distribution in a | |
103 | future release, and will at that time need to be installed from CPAN. | |
104 | Distributions on CPAN which require these modules will need to list them as | |
105 | prerequisites. | |
106 | ||
107 | The core versions of these modules will now issue C<"deprecated">-category | |
108 | warnings to alert you to this fact. To silence these deprecation warnings, | |
109 | install the modules in question from CPAN. | |
110 | ||
111 | Note that these are (with rare exceptions) fine modules that you are encouraged | |
112 | to continue to use. Their disinclusion from core primarily hinges on their | |
113 | necessity to bootstrapping a fully functional, CPAN-capable Perl installation, | |
114 | not usually on concerns over their design. | |
115 | ||
116 | =over | |
117 | ||
118 | =item XXX | |
119 | ||
120 | XXX Note that deprecated modules should be listed here even if they are listed | |
121 | as an updated module in the L</Modules and Pragmata> section. | |
122 | ||
123 | =back | |
124 | ||
125 | [ List each other deprecation as a =head2 entry ] | |
126 | ||
127 | =head1 Performance Enhancements | |
128 | ||
129 | XXX Changes which enhance performance without changing behaviour go here. | |
130 | There may well be none in a stable release. | |
131 | ||
132 | [ List each enhancement as a =item entry ] | |
133 | ||
134 | =over 4 | |
135 | ||
136 | =item * | |
137 | ||
138 | XXX | |
139 | ||
140 | =back | |
141 | ||
7ef8b31d | 142 | =head1 Modules and Pragmata |
f6f3144e | 143 | |
7065301c RS |
144 | XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/> |
145 | go here. If Module::CoreList is updated, generate an initial draft of the | |
146 | following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary | |
147 | for important changes should then be added by hand. In an ideal world, | |
148 | dual-life modules would have a F<Changes> file that could be cribbed. | |
149 | ||
150 | [ Within each section, list entries as a =item entry ] | |
151 | ||
152 | =head2 New Modules and Pragmata | |
24a38d90 RS |
153 | |
154 | =over 4 | |
155 | ||
156 | =item * | |
157 | ||
7065301c RS |
158 | XXX |
159 | ||
160 | =back | |
161 | ||
162 | =head2 Updated Modules and Pragmata | |
163 | ||
164 | =over 4 | |
24a38d90 RS |
165 | |
166 | =item * | |
167 | ||
56cdf413 TC |
168 | L<Carp> has been upgraded from version 1.3301 to 1.34. |
169 | ||
170 | Carp::Heavy now ignores version mismatches with Carp if Carp is newer | |
171 | than 1.12, since Carp::Heavy's guts were merged into Carp at that | |
172 | point. | |
173 | L<[perl #121574]|https://rt.perl.org/Ticket/Display.html?id=121574> | |
174 | ||
175 | =item * | |
176 | ||
28e02325 SH |
177 | L<Encode> has been upgraded from version 2.60_01 to 2.62. |
178 | ||
179 | B<piconv> now has better error handling when the encoding name is nonexistent, | |
180 | and a build breakage when upgrading L<Encode> in perl-5.8.2 and earlier has | |
181 | been fixed. | |
182 | ||
183 | =item * | |
184 | ||
5abafd4c SH |
185 | The libnet collection of modules has been upgraded from version 1.25 to 1.27. |
186 | ||
187 | There are only whitespace changes to the installed files. | |
188 | ||
189 | =item * | |
190 | ||
4ed8f5ed TC |
191 | L<Math::BigInt> has been upgraded from version 1.9993 to 1.9994. |
192 | ||
193 | Synchronize POD changes from the CPAN release. | |
194 | ||
ee15bb65 TC |
195 | C<< Math::BigFloat->blog(x) >> would sometimes return blog(2*x) when |
196 | the accuracy was greater than 70 digits. | |
197 | ||
198 | The result of C<< Math::BigFloat->bdiv() >> in list context now | |
199 | satisfies C<< x = quotient * divisor + remainder >>. | |
200 | ||
4ed8f5ed TC |
201 | =item * |
202 | ||
234105dd TC |
203 | L<Math::BigRat> has been upgraded from version 0.2606 to 0.2607. |
204 | ||
205 | Synchronize POD changes from the CPAN release. | |
206 | ||
207 | =item * | |
208 | ||
c13fd1a2 TC |
209 | L<perl5db.pl> has been upgraded from version 1.44 to 1.45. |
210 | ||
3ca75eca YO |
211 | =item * |
212 | ||
213 | A mismatch between the documentation and the code in utf8::downgrade() | |
214 | was fixed in favour of the documentation. The optional second argument | |
215 | is now correctly treated as a perl boolean (true/false semantics) and | |
216 | not as an integer. | |
217 | ||
218 | =item * | |
219 | ||
c13fd1a2 | 220 | fork() in the debugger under C<tmux> will now create a new window for |
891822fa TC |
221 | the forked process. L<[perl |
222 | #121333]|https://rt.perl.org/Ticket/Display.html?id=121333> | |
223 | ||
224 | The debugger now saves the current working directory on startup and | |
225 | restores it when you restart your program with C<R> or <rerun>. L<[perl | |
226 | #121509]|https://rt.perl.org/Ticket/Display.html?id=121509> | |
24a38d90 | 227 | |
f8187d97 SH |
228 | L<Unicode::Collate> has been upgraded from version 1.04 to 1.07. |
229 | ||
230 | Version 0.67's improved discontiguous contractions is invalidated by default | |
231 | and is supported as a parameter 'long_contraction'. | |
232 | ||
95f3e8d2 SH |
233 | =item * |
234 | ||
235 | L<Unicode::Normalize> has been upgraded from version 1.17 to 1.18. | |
236 | ||
237 | The XSUB implementation has been removed in favour of pure Perl. | |
238 | ||
3eaa3d14 YO |
239 | =item * |
240 | ||
241 | L<Hash::Util> has been upgraded from version 0.16 to 0.17. | |
242 | ||
243 | Minor bug fixes and documentation fixes to Hash::Util::hash_stats() | |
244 | ||
245 | ||
238894db | 246 | =back |
24a38d90 | 247 | |
92fa985e | 248 | =head2 Removed Modules and Pragmata |
24a38d90 | 249 | |
238894db | 250 | =over 4 |
24a38d90 RS |
251 | |
252 | =item * | |
253 | ||
7065301c RS |
254 | XXX |
255 | ||
256 | =back | |
257 | ||
258 | =head1 Documentation | |
259 | ||
260 | XXX Changes to files in F<pod/> go here. Consider grouping entries by | |
261 | file and be sure to link to the appropriate page, e.g. L<perlfunc>. | |
262 | ||
263 | =head2 New Documentation | |
264 | ||
265 | XXX Changes which create B<new> files in F<pod/> go here. | |
266 | ||
267 | =head3 L<XXX> | |
268 | ||
269 | XXX Description of the purpose of the new file here | |
270 | ||
271 | =head2 Changes to Existing Documentation | |
272 | ||
273 | XXX Changes which significantly change existing files in F<pod/> go here. | |
274 | However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics> | |
275 | section. | |
276 | ||
277 | =head3 L<XXX> | |
278 | ||
279 | =over 4 | |
280 | ||
281 | =item * | |
282 | ||
283 | XXX Description of the change here | |
284 | ||
285 | =back | |
286 | ||
287 | =head1 Diagnostics | |
288 | ||
289 | The following additions or changes have been made to diagnostic output, | |
290 | including warnings and fatal error messages. For the complete list of | |
291 | diagnostic messages, see L<perldiag>. | |
292 | ||
293 | XXX New or changed warnings emitted by the core's C<C> code go here. Also | |
294 | include any changes in L<perldiag> that reconcile it to the C<C> code. | |
295 | ||
296 | =head2 New Diagnostics | |
297 | ||
298 | XXX Newly added diagnostic messages go under here, separated into New Errors | |
299 | and New Warnings | |
300 | ||
301 | =head3 New Errors | |
302 | ||
303 | =over 4 | |
24a38d90 RS |
304 | |
305 | =item * | |
306 | ||
7065301c RS |
307 | XXX L<message|perldiag/"message"> |
308 | ||
309 | =back | |
310 | ||
311 | =head3 New Warnings | |
312 | ||
313 | =over 4 | |
24a38d90 RS |
314 | |
315 | =item * | |
316 | ||
7065301c | 317 | XXX L<message|perldiag/"message"> |
24a38d90 | 318 | |
238894db | 319 | =back |
24a38d90 | 320 | |
7065301c | 321 | =head2 Changes to Existing Diagnostics |
24a38d90 | 322 | |
7065301c | 323 | XXX Changes (i.e. rewording) of diagnostic messages go here |
24a38d90 | 324 | |
7065301c RS |
325 | =over 4 |
326 | ||
327 | =item * | |
328 | ||
723edb96 TC |
329 | L<Unsuccessful %s on filename containing newline|perldiag/"Unsuccessful %s on filename containing newline"> |
330 | ||
331 | This warning is now only produced when the newline is at the end of | |
332 | the filename. | |
7065301c RS |
333 | |
334 | =back | |
335 | ||
336 | =head1 Utility Changes | |
337 | ||
338 | XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here. | |
339 | Most of these are built within the directories F<utils> and F<x2p>. | |
340 | ||
341 | [ List utility changes as a =head2 entry for each utility and =item | |
342 | entries for each change | |
343 | Use L<XXX> with program names to get proper documentation linking. ] | |
344 | ||
345 | =head2 L<XXX> | |
346 | ||
347 | =over 4 | |
348 | ||
349 | =item * | |
24a38d90 | 350 | |
7065301c RS |
351 | XXX |
352 | ||
353 | =back | |
354 | ||
355 | =head1 Configuration and Compilation | |
356 | ||
357 | XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools | |
358 | go here. Any other changes to the Perl build process should be listed here. | |
359 | However, any platform-specific changes should be listed in the | |
360 | L</Platform Support> section, instead. | |
361 | ||
362 | [ List changes as a =item entry ]. | |
363 | ||
364 | =over 4 | |
365 | ||
366 | =item * | |
367 | ||
368 | XXX | |
369 | ||
370 | =back | |
371 | ||
372 | =head1 Testing | |
373 | ||
374 | XXX Any significant changes to the testing of a freshly built perl should be | |
375 | listed here. Changes which create B<new> files in F<t/> go here as do any | |
376 | large changes to the testing harness (e.g. when parallel testing was added). | |
377 | Changes to existing files in F<t/> aren't worth summarizing, although the bugs | |
378 | that they represent may be covered elsewhere. | |
379 | ||
380 | [ List each test improvement as a =item entry ] | |
381 | ||
382 | =over 4 | |
383 | ||
384 | =item * | |
385 | ||
386 | XXX | |
387 | ||
388 | =back | |
389 | ||
390 | =head1 Platform Support | |
391 | ||
392 | XXX Any changes to platform support should be listed in the sections below. | |
393 | ||
394 | [ Within the sections, list each platform as a =item entry with specific | |
395 | changes as paragraphs below it. ] | |
396 | ||
397 | =head2 New Platforms | |
398 | ||
399 | XXX List any platforms that this version of perl compiles on, that previous | |
400 | versions did not. These will either be enabled by new files in the F<hints/> | |
401 | directories, or new subdirectories and F<README> files at the top level of the | |
402 | source tree. | |
403 | ||
404 | =over 4 | |
405 | ||
406 | =item XXX-some-platform | |
407 | ||
408 | XXX | |
409 | ||
410 | =back | |
411 | ||
412 | =head2 Discontinued Platforms | |
413 | ||
414 | XXX List any platforms that this version of perl no longer compiles on. | |
415 | ||
416 | =over 4 | |
417 | ||
418 | =item XXX-some-platform | |
419 | ||
420 | XXX | |
421 | ||
422 | =back | |
423 | ||
424 | =head2 Platform-Specific Notes | |
425 | ||
426 | XXX List any changes for specific platforms. This could include configuration | |
427 | and compilation changes or changes in portability/compatibility. However, | |
428 | changes within modules for platforms should generally be listed in the | |
429 | L</Modules and Pragmata> section. | |
430 | ||
431 | =over 4 | |
432 | ||
433 | =item XXX-some-platform | |
434 | ||
435 | XXX | |
436 | ||
437 | =back | |
438 | ||
439 | =head1 Internal Changes | |
440 | ||
441 | XXX Changes which affect the interface available to C<XS> code go here. Other | |
442 | significant internal changes for future core maintainers should be noted as | |
443 | well. | |
444 | ||
7065301c RS |
445 | =over 4 |
446 | ||
447 | =item * | |
448 | ||
8dab3ba5 | 449 | The deprecated variable C<PL_sv_objcount> has been removed. |
7065301c RS |
450 | |
451 | =back | |
452 | ||
453 | =head1 Selected Bug Fixes | |
454 | ||
455 | XXX Important bug fixes in the core language are summarized here. Bug fixes in | |
456 | files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>. | |
457 | ||
458 | [ List each fix as a =item entry ] | |
459 | ||
460 | =over 4 | |
461 | ||
462 | =item * | |
463 | ||
30536d4a TC |
464 | index() and rindex() no longer crash when used on strings over 2GB in |
465 | size. | |
466 | L<[perl #121562]|https://rt.perl.org/Ticket/Display.html?id=121562>. | |
7065301c | 467 | |
0c2c57a8 DD |
468 | =item * |
469 | ||
470 | A small previously intentional memory leak in PERL_SYS_INIT/PERL_SYS_INIT3 on | |
471 | Win32 builds was fixed. This might affect embedders who repeatedly create and | |
472 | destroy perl engines within the same process. | |
473 | ||
7065301c RS |
474 | =back |
475 | ||
476 | =head1 Known Problems | |
477 | ||
478 | XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any | |
479 | tests that had to be C<TODO>ed for the release would be noted here. Unfixed | |
480 | platform specific bugs also go here. | |
481 | ||
482 | [ List each fix as a =item entry ] | |
483 | ||
484 | =over 4 | |
485 | ||
486 | =item * | |
487 | ||
488 | XXX | |
489 | ||
490 | =back | |
491 | ||
492 | =head1 Errata From Previous Releases | |
493 | ||
494 | =over 4 | |
495 | ||
496 | =item * | |
497 | ||
498 | XXX Add anything here that we forgot to add, or were mistaken about, in | |
499 | the perldelta of a previous release. | |
500 | ||
501 | =back | |
502 | ||
503 | =head1 Obituary | |
504 | ||
505 | XXX If any significant core contributor has died, we've added a short obituary | |
506 | here. | |
507 | ||
508 | =head1 Acknowledgements | |
24a38d90 | 509 | |
7065301c | 510 | XXX Generate this with: |
52e02e68 | 511 | |
7065301c | 512 | perl Porting/acknowledgements.pl v5.21.1..HEAD |
f5b73711 | 513 | |
44691e6f AB |
514 | =head1 Reporting Bugs |
515 | ||
e08634c5 SH |
516 | If you find what you think is a bug, you might check the articles recently |
517 | posted to the comp.lang.perl.misc newsgroup and the perl bug database at | |
238894db | 518 | https://rt.perl.org/ . There may also be information at |
7ef8b31d | 519 | http://www.perl.org/ , the Perl Home Page. |
44691e6f | 520 | |
e08634c5 SH |
521 | If you believe you have an unreported bug, please run the L<perlbug> program |
522 | included with your release. Be sure to trim your bug down to a tiny but | |
523 | sufficient test case. Your bug report, along with the output of C<perl -V>, | |
524 | will be sent off to perlbug@perl.org to be analysed by the Perl porting team. | |
44691e6f AB |
525 | |
526 | If the bug you are reporting has security implications, which make it | |
e08634c5 SH |
527 | inappropriate to send to a publicly archived mailing list, then please send it |
528 | to perl5-security-report@perl.org. This points to a closed subscription | |
529 | unarchived mailing list, which includes all the core committers, who will be | |
530 | able to help assess the impact of issues, figure out a resolution, and help | |
f9001595 | 531 | co-ordinate the release of patches to mitigate or fix the problem across all |
e08634c5 SH |
532 | platforms on which Perl is supported. Please only use this address for |
533 | security issues in the Perl core, not for modules independently distributed on | |
534 | CPAN. | |
44691e6f AB |
535 | |
536 | =head1 SEE ALSO | |
537 | ||
e08634c5 SH |
538 | The F<Changes> file for an explanation of how to view exhaustive details on |
539 | what changed. | |
44691e6f AB |
540 | |
541 | The F<INSTALL> file for how to build Perl. | |
542 | ||
543 | The F<README> file for general stuff. | |
544 | ||
545 | The F<Artistic> and F<Copying> files for copyright information. | |
546 | ||
547 | =cut |