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44691e6f AB |
1 | =encoding utf8 |
2 | ||
7818c927 FC |
3 | =for comment |
4 | This has been completed up to 7be5bd17, except for: | |
5 | bb789b09de07edfb74477eb1603949c96d60927d (Dave Mitchell) | |
6 | ||
44691e6f AB |
7 | =head1 NAME |
8 | ||
0890f1a5 FC |
9 | [ this is a template for a new perldelta file. Any text flagged as |
10 | XXX needs to be processed before release. ] | |
6e925ecb | 11 | |
0890f1a5 | 12 | perldelta - what is new for perl v5.15.1 |
f5938650 | 13 | |
0890f1a5 | 14 | =head1 DESCRIPTION |
760696b8 | 15 | |
0890f1a5 FC |
16 | This document describes differences between the 5.15.1 release and |
17 | the 5.15.0 release. | |
760696b8 | 18 | |
0890f1a5 FC |
19 | If you are upgrading from an earlier release such as 5.14.0, first read |
20 | L<perl5150delta>, which describes differences between 5.14.0 and | |
21 | 5.15.0. | |
760696b8 | 22 | |
0890f1a5 | 23 | =head1 Notice |
760696b8 | 24 | |
0890f1a5 | 25 | XXX Any important notices here |
6693394d | 26 | |
0890f1a5 | 27 | =head1 Core Enhancements |
6693394d | 28 | |
0890f1a5 FC |
29 | XXX New core language features go here. Summarise user-visible core language |
30 | enhancements. Particularly prominent performance optimisations could go | |
31 | here, but most should go in the L</Performance Enhancements> section. | |
6693394d | 32 | |
0890f1a5 | 33 | [ List each enhancement as a =head2 entry ] |
6693394d | 34 | |
5cd408a2 EB |
35 | =head2 C<splice()> doesn't warn when truncating |
36 | ||
37 | You can now limit the size of an array using C<splice(@a,MAX_LEN)> without | |
38 | worrying about warnings. | |
39 | ||
062678b2 FC |
40 | =head2 The C<\$> prototype accepts any scalar lvalue |
41 | ||
42 | The C<\$> and C<\[$]> subroutine prototypes now accept any scalar lvalue | |
43 | argument. Previously they only accepted scalars beginning with C<$> and | |
44 | hash and array elements. This change makes them consistent with the way | |
45 | the built-in C<read> and C<recv> functions (among others) parse their | |
46 | arguments. This means that one can override the built-in functions with | |
47 | custom subroutines that parse their arguments the same way. | |
48 | ||
4185c919 NC |
49 | =head2 You can now C<study> more than one string |
50 | ||
51 | The restriction that you can only have one C<study> active at a time has been | |
52 | removed. You can now usefully C<study> as many strings as you want (until you | |
53 | exhaust memory). | |
54 | ||
82aed44a KW |
55 | =head2 The Unicode C<Script_Extensions> property is now supported. |
56 | ||
57 | New in Unicode 6.0, this is an improved C<Script> property. Details | |
58 | are in L<perlunicode/Scripts>. | |
59 | ||
2b679393 SM |
60 | =head2 DTrace probes for interpreter phase change |
61 | ||
62 | The C<phase-change> probes will fire when the interpreter's phase | |
63 | changes, which tracks the C<${^GLOBAL_PHASE}> variable. C<arg0> is | |
64 | the new phase name; C<arg1> is the old one. This is useful mostly | |
65 | for limiting your instrumentation to one or more of: compile time, | |
66 | run time, destruct time. | |
67 | ||
7818c927 FC |
68 | =head2 New Pad API |
69 | ||
70 | Many new functions have been added to the API for manipulating lexical | |
71 | pads. See L<perlapi/Pad Data Structures> for more information. | |
72 | ||
0890f1a5 | 73 | =head1 Security |
6693394d | 74 | |
0890f1a5 FC |
75 | XXX Any security-related notices go here. In particular, any security |
76 | vulnerabilities closed should be noted here rather than in the | |
77 | L</Selected Bug Fixes> section. | |
b7188eb5 | 78 | |
0890f1a5 | 79 | [ List each security issue as a =head2 entry ] |
e8e35311 | 80 | |
0890f1a5 | 81 | =head1 Incompatible Changes |
2c389f6c | 82 | |
0890f1a5 | 83 | XXX For a release on a stable branch, this section aspires to be: |
760696b8 | 84 | |
307f4217 NC |
85 | There are no changes intentionally incompatible with 5.XXX.XXX |
86 | If any exist, they are bugs and reports are welcome. | |
760696b8 | 87 | |
0890f1a5 | 88 | [ List each incompatible change as a =head2 entry ] |
760696b8 | 89 | |
0890f1a5 | 90 | =head1 Deprecations |
760696b8 | 91 | |
0890f1a5 FC |
92 | XXX Any deprecated features, syntax, modules etc. should be listed here. |
93 | In particular, deprecated modules should be listed here even if they are | |
94 | listed as an updated module in the L</Modules and Pragmata> section. | |
760696b8 | 95 | |
0890f1a5 | 96 | [ List each deprecation as a =head2 entry ] |
760696b8 | 97 | |
0890f1a5 | 98 | =head1 Performance Enhancements |
760696b8 | 99 | |
0890f1a5 FC |
100 | XXX Changes which enhance performance without changing behaviour go here. There |
101 | may well be none in a stable release. | |
760696b8 | 102 | |
0890f1a5 | 103 | [ List each enhancement as a =item entry ] |
6693394d FC |
104 | |
105 | =over 4 | |
106 | ||
107 | =item * | |
108 | ||
92c695db S |
109 | The short-circuiting operators C<&&>, C<||>, and C<//> are now |
110 | considerably faster in the short-circuiting case due to reduced | |
111 | OP-tree traversal. | |
112 | ||
113 | =item * | |
114 | ||
f199eb7b | 115 | The implementation of C<s///r> makes one less copy of the scalar's value. |
6693394d | 116 | |
bfafcb9a NC |
117 | =item * |
118 | ||
119 | If a studied scalar is C<split> with a regex, the engine will now take | |
120 | advantage of the C<study> data. | |
121 | ||
72de20cd NC |
122 | =item * |
123 | ||
124 | C<study> now uses considerably less memory for shorter strings. Strings shorter | |
125 | than 65535 characters use roughly half the memory than previously, strings | |
126 | shorter than 255 characters use roughly one quarter of the memory. | |
127 | ||
93905212 FC |
128 | =item * |
129 | ||
130 | Recursive calls to lvalue subroutines in lvalue scalar context use less | |
131 | memory. | |
132 | ||
6693394d FC |
133 | =back |
134 | ||
0890f1a5 | 135 | =head1 Modules and Pragmata |
bdb9ba77 | 136 | |
0890f1a5 FC |
137 | XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/> |
138 | go here. If Module::CoreList is updated, generate an initial draft of the | |
139 | following sections using F<Porting/corelist-perldelta.pl>, which prints stub | |
140 | entries to STDOUT. Results can be pasted in place of the '=head2' entries | |
141 | below. A paragraph summary for important changes should then be added by hand. | |
142 | In an ideal world, dual-life modules would have a F<Changes> file that could be | |
143 | cribbed. | |
bdb9ba77 | 144 | |
0890f1a5 | 145 | [ Within each section, list entries as a =item entry ] |
bdb9ba77 | 146 | |
0890f1a5 | 147 | =head2 New Modules and Pragmata |
6693394d | 148 | |
0890f1a5 | 149 | =over 4 |
6693394d FC |
150 | |
151 | =item * | |
152 | ||
7818c927 FC |
153 | The logic for parsing, merging, and dumping XS typemaps has been extracted |
154 | from C<ExtUtils::ParseXS> into a module of its own, L<ExtUtils::Typemaps>. | |
155 | C<ExtUtils::Typemaps> offers an interface to typemap handling outside of | |
156 | the scope of the XS compiler itself. | |
157 | ||
158 | As a first use case of the improved API and extensibility, typemaps can now | |
159 | be included inline in XS code with a HEREDOC-like syntax: | |
160 | ||
161 | TYPEMAP: <<END_TYPEMAP | |
162 | MyType T_IV | |
163 | END_TYPEMAP | |
6693394d FC |
164 | |
165 | =back | |
166 | ||
0890f1a5 | 167 | =head2 Updated Modules and Pragmata |
760696b8 | 168 | |
0890f1a5 | 169 | =over 4 |
760696b8 FC |
170 | |
171 | =item * | |
172 | ||
7818c927 | 173 | L<B::Deparse> has been upgrade from version 1.05 to 1.06. |
259925f6 | 174 | |
7818c927 FC |
175 | It now correctly deparses interpolation of punctuation variables (like |
176 | C<@*>) that do not interpolate without braces [perl #93990]. | |
259925f6 S |
177 | |
178 | =item * | |
179 | ||
90a3c601 CBW |
180 | L<CGI> has been upgraded from version 3.54 to version 3.55 |
181 | ||
182 | [THINGS THAT MAY BREAK YOUR CODE] | |
183 | ||
184 | C<url()> was fixed to return C<PATH_INFO> when it is explicitly requested | |
185 | with either the path=>1 or path_info=>1 flag. | |
186 | ||
187 | If your code is running under mod_rewrite (or compatible) and you are calling C<self_url()> or | |
188 | you are calling C<url()> and passing path_info=>1, These methods will actually be | |
189 | returning C<PATH_INFO> now, as you have explicitly requested, or has C<self_url()> | |
190 | has requested on your behalf. | |
191 | ||
192 | The C<PATH_INFO> has been omitted in such URLs since the issue was introduced | |
193 | in the 3.12 release in December, 2005. | |
194 | ||
195 | This bug is so old your application may have come to depend on it or | |
196 | workaround it. Check for application before upgrading to this release. | |
197 | ||
198 | Examples of affected method calls: | |
199 | ||
200 | $q->url(-absolute => 1, -query => 1, -path_info => 1 ) | |
201 | $q->url(-path=>1) | |
202 | $q->url(-full=>1,-path=>1) | |
203 | $q->url(-rewrite=>1,-path=>1) | |
204 | $q->self_url(); | |
205 | ||
206 | =item * | |
207 | ||
cd272cae | 208 | L<Compress::Raw::Bzip2> has been upgraded from version 2.035 to version 2.037 |
1d5c9fb0 CBW |
209 | |
210 | =item * | |
211 | ||
98a34606 | 212 | L<Compress::Raw::Zlib> has been upgraded from version 2.035 to version 2.037 |
bc771c2e CBW |
213 | |
214 | Added offset parameter to CRC32 | |
215 | ||
216 | =item * | |
217 | ||
101c03fa | 218 | L<Compress::Zlib> has been upgraded from version 2.035 to version 2.037 |
529174d6 CBW |
219 | |
220 | IO::Compress::Zip and IO::Uncompress::Unzip now have support for LZMA (method 14). | |
101c03fa CBW |
221 | There is a fix for a CRC issue in IO::Compress::Unzip and it supports Streamed |
222 | Stored context now. And fixed a Zip64 issue in | |
529174d6 CBW |
223 | IO::Compress::Zip when the content size was exactly 0xFFFFFFFF. |
224 | ||
225 | =item * | |
226 | ||
09127a34 | 227 | L<CPANPLUS> has been upgraded from version 0.9105 to version 0.9107 |
17f2f4a8 CBW |
228 | |
229 | =item * | |
230 | ||
7818c927 FC |
231 | L<Cwd> has been upgraded from version 3.36 to 3.37, to address an |
232 | incompatibility with the EPIC debugger. | |
233 | ||
234 | =item * | |
235 | ||
236 | L<diagnostics> has been upgraded from version 1.22 to 1.23. | |
237 | ||
238 | It now knows how to find descriptions for diagnostic messages ending with a | |
239 | dot, instead getting confused by it. | |
240 | ||
241 | =item * | |
242 | ||
4b5789fe CBW |
243 | L<ExtUtils::MakeMaker> has been upgraded from version 6.57_05 to version 6.58 |
244 | ||
245 | =item * | |
246 | ||
7818c927 FC |
247 | L<ExtUtils::ParseXS> has been upgraded from version 2.2210 to 3.00_01. |
248 | ||
249 | Much of L<ExtUtils::ParseXS>, the module behind the XS compiler C<xsubpp>, | |
250 | was rewritten and cleaned up. It has been made somewhat more extensible | |
251 | and now finally uses strictures. | |
252 | ||
253 | The typemap logic has been moved into a separate module, | |
254 | L<ExtUtils::Typemaps>. See L</New Modules and Pragmata>, above. | |
255 | ||
256 | =item * | |
257 | ||
508236ce CBW |
258 | L<IPC::Cmd> has been upgraded from version 0.70 to version 0.72 |
259 | ||
260 | Capturing of command output (both C<STDOUT> and C<STDERR>) is now supported | |
261 | using L<IPC::Open3> on MSWin32 without requiring L<IPC::Run>. | |
262 | ||
263 | =item * | |
264 | ||
c69a30ec CBW |
265 | L<Locale::Codes> has been upgraded from version 3.16 to version 3.17 |
266 | ||
267 | Added Language Extension codes (langext) and Language Variation codes | |
268 | (langvar) as defined in the IANA language registry. | |
269 | ||
270 | Added language codes from ISO 639-5 | |
271 | ||
272 | Added language/script codes from the IANA language subtag | |
273 | registry | |
274 | ||
275 | Fixed an uninitialized value warning. RT 67438 | |
276 | ||
277 | Fixed the return value for the all_XXX_codes and all_XXX_names functions. RT 69100 | |
278 | ||
279 | Reorganized modules to move Locale::MODULE to Locale::Codes::MODULE to | |
280 | allow for cleaner future additions. The original four modules (Locale::Language, | |
281 | Locale::Currency, Locale::Country, Locale::Script) will continue to work, but | |
282 | all new sets of codes will be added in the Locale::Codes namespace. | |
283 | ||
284 | =item * | |
285 | ||
bb3abb05 FC |
286 | L<attributes> has been upgraded from version 0.14 to 0.15, as part of the |
287 | lvalue attribute warnings fix. See L</Selected Bug Fixes>, below. | |
2c389f6c | 288 | |
7c420290 NC |
289 | =item * |
290 | ||
291 | L<Math::BigInt::FastCalc> has been upgraded from version 0.28 to version 0.29. | |
292 | ||
293 | The XS code is now compiled with C<PERL_NO_GET_CONTEXT>, which will aid | |
294 | performance under ithreads. | |
295 | ||
0cb4637e CBW |
296 | =item * |
297 | ||
7818c927 FC |
298 | XXX This will probably be 2.53 for 5.15.1, as there has been a CPAN |
299 | release of 2.52. | |
300 | ||
dd413713 | 301 | L<Module::CoreList> has been upgraded from version 2.51 to 2.53. |
7818c927 FC |
302 | |
303 | Some extraneous (and erroneous) entries have been removed | |
304 | [rt.cpan.org #69108]. | |
305 | ||
dd413713 CBW |
306 | The C<corelist> utility now understands the C<-r> option for |
307 | displaying Perl release dates. | |
308 | ||
7818c927 FC |
309 | =item * |
310 | ||
311 | L<Pod::Perldoc> has been upgraded from version 3.15_05 to 3.15_06. | |
312 | ||
313 | The B<-v> option now fetches the right section for C<$0>. | |
314 | ||
315 | =item * | |
316 | ||
5aeca1f7 CBW |
317 | L<Pod::Simple> has been upgraded from version 3.16 to version 3.17 |
318 | ||
319 | =item * | |
320 | ||
0cb4637e CBW |
321 | L<Unicode::Collate> has been upgraded from version 0.76 to version 0.77 |
322 | ||
323 | Applied [perl #93470] silencing compiler warnings with -Wwrite-strings | |
324 | ||
00f02a57 CBW |
325 | =item * |
326 | ||
327 | L<Win32API::File> has been upgraded from version 0.1101 to version 0.1200 | |
328 | ||
329 | Added SetStdHandle and GetStdHandle functions | |
330 | ||
8b00e523 NC |
331 | =item * |
332 | ||
333 | L<threads> has been upgraded from version 1.83 to 1.84 | |
334 | ||
335 | An unused variable was removed from the XS code. | |
336 | ||
e8e35311 FC |
337 | =back |
338 | ||
0890f1a5 | 339 | =head2 Removed Modules and Pragmata |
bdb9ba77 | 340 | |
0890f1a5 | 341 | =over 4 |
bdb9ba77 DG |
342 | |
343 | =item * | |
344 | ||
17d5d82d FR |
345 | Perl 4-era .pl libraries |
346 | ||
347 | Perl used to bundle a handful of library files that predate Perl 5. Most of | |
348 | these files, which have been deprecated since version 5.14.0, have now been | |
349 | removed. If your code still relies on these libraries, you can install them | |
350 | again from C<Perl4::CoreLibs> on CPAN. | |
bdb9ba77 DG |
351 | |
352 | =back | |
353 | ||
0890f1a5 | 354 | =head1 Documentation |
f5938650 | 355 | |
0890f1a5 FC |
356 | XXX Changes to files in F<pod/> go here. Consider grouping entries by |
357 | file and be sure to link to the appropriate page, e.g. L<perlfunc>. | |
f5938650 | 358 | |
0890f1a5 | 359 | =head2 New Documentation |
f5938650 | 360 | |
0890f1a5 | 361 | XXX Changes which create B<new> files in F<pod/> go here. |
f5938650 | 362 | |
2b679393 | 363 | =head3 L<perldtrace> |
bdb9ba77 | 364 | |
2b679393 SM |
365 | L<perldtrace> describes Perl's DTrace support, listing the provided probes |
366 | and gives examples of their use. | |
bdb9ba77 | 367 | |
7818c927 FC |
368 | =head3 L<perl5141delta> |
369 | ||
370 | The delta file for Perl 5.14.1 has been copied to blead. | |
371 | ||
0890f1a5 FC |
372 | =head2 Changes to Existing Documentation |
373 | ||
374 | XXX Changes which significantly change existing files in F<pod/> go here. | |
375 | However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics> | |
376 | section. | |
f5938650 | 377 | |
0890f1a5 | 378 | =head3 L<XXX> |
6693394d | 379 | |
0890f1a5 | 380 | =over 4 |
6693394d FC |
381 | |
382 | =item * | |
383 | ||
0890f1a5 | 384 | XXX Description of the change here |
6693394d | 385 | |
259925f6 S |
386 | =item * |
387 | ||
388 | L<perlxs> was extended with documentation on inline typemaps. | |
389 | ||
7818c927 FC |
390 | =item * |
391 | ||
392 | L<perlref> has a new L<Circular References|perlref/Circular References> | |
393 | section explaining how circularities may not be freed and how to solve that | |
394 | with weak references. | |
395 | ||
396 | =item * | |
397 | ||
398 | The documentation for smart match in L<perlsyn> has been corrected for the | |
399 | case of C<undef> on the left-hand side. The list of different smart match | |
400 | behaviours had an item in the wrong place. | |
401 | ||
6693394d FC |
402 | =back |
403 | ||
34dc2ec0 | 404 | =head1 Diagnostics |
b7188eb5 | 405 | |
34dc2ec0 DM |
406 | The following additions or changes have been made to diagnostic output, |
407 | including warnings and fatal error messages. For the complete list of | |
408 | diagnostic messages, see L<perldiag>. | |
44691e6f | 409 | |
0890f1a5 FC |
410 | XXX New or changed warnings emitted by the core's C<C> code go here. Also |
411 | include any changes in L<perldiag> that reconcile it to the C<C> code. | |
2c389f6c | 412 | |
0890f1a5 FC |
413 | [ Within each section, list entries as a =item entry that links to perldiag, |
414 | e.g. | |
2c389f6c | 415 | |
0890f1a5 | 416 | =item * |
b7188eb5 | 417 | |
0890f1a5 FC |
418 | L<Invalid version object|perldiag/"Invalid version object"> |
419 | ] | |
5076a392 | 420 | |
0890f1a5 | 421 | =head2 New Diagnostics |
5076a392 | 422 | |
0890f1a5 | 423 | XXX Newly added diagnostic messages go here |
e8e35311 | 424 | |
0890f1a5 | 425 | =head3 New Errors |
5076a392 | 426 | |
34dc2ec0 | 427 | =over 4 |
5076a392 | 428 | |
e8e35311 | 429 | =item * |
5076a392 | 430 | |
0890f1a5 | 431 | XXX L<message|perldiag/"message"> |
a0ed52f4 | 432 | |
bdb9ba77 | 433 | =back |
bdab33d1 | 434 | |
0890f1a5 | 435 | =head3 New Warnings |
d430b8e7 | 436 | |
0890f1a5 | 437 | =over 4 |
5076a392 | 438 | |
bdb9ba77 | 439 | =item * |
5076a392 | 440 | |
0890f1a5 | 441 | XXX L<message|perldiag/"message"> |
5076a392 | 442 | |
bdb9ba77 | 443 | =back |
e8e35311 | 444 | |
0890f1a5 | 445 | =head2 Changes to Existing Diagnostics |
42a91c97 | 446 | |
0890f1a5 | 447 | XXX Changes (i.e. rewording) of diagnostic messages go here |
6693394d | 448 | |
34dc2ec0 | 449 | =over 4 |
42a91c97 | 450 | |
6693394d | 451 | =item * |
42a91c97 | 452 | |
7818c927 FC |
453 | The L<Invalid version format|perldiag/"Invalid version format (%s)"> |
454 | error message now says "negative version number" within the parentheses, | |
455 | rather than "non-numeric data", for negative numbers. | |
456 | ||
457 | =item * | |
458 | ||
459 | The two warnings | |
460 | L<Possible attempt to put comments in qw() list|perldiag/"Possible attempt to put comments in qw() list"> | |
461 | and | |
462 | L<Possible attempt to separate words with commas|perldiag/"Possible attempt to separate words with commas"> | |
463 | are no longer mutually exclusive: the same C<qw> construct may produce | |
464 | both. | |
465 | ||
466 | =item * | |
467 | ||
468 | Warnings that mention the names of lexical (C<my>) variables with Unicode | |
469 | characters in them now respect the presence or absence of the C<:utf8> | |
470 | layer on the output handle, instead of outputting UTF8 regardless. Also, | |
471 | the correct names are included in the strings passed to C<$SIG{__WARN__}> | |
472 | handlers, rather than the raw UTF8 bytes. | |
42a91c97 | 473 | |
34dc2ec0 | 474 | =back |
42a91c97 | 475 | |
0890f1a5 | 476 | =head1 Utility Changes |
69c6927c | 477 | |
0890f1a5 FC |
478 | XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go |
479 | here. Most of these are built within the directories F<utils> and F<x2p>. | |
69c6927c | 480 | |
0890f1a5 FC |
481 | [ List utility changes as a =head3 entry for each utility and =item |
482 | entries for each change | |
483 | Use L<XXX> with program names to get proper documentation linking. ] | |
c13a5c80 | 484 | |
0890f1a5 | 485 | =head3 L<XXX> |
c13a5c80 | 486 | |
0890f1a5 | 487 | =over 4 |
bdab33d1 | 488 | |
571f0e86 NC |
489 | =item * |
490 | ||
0890f1a5 | 491 | XXX |
384e62c0 DG |
492 | |
493 | =back | |
494 | ||
0890f1a5 | 495 | =head1 Configuration and Compilation |
cdc10f43 | 496 | |
0890f1a5 FC |
497 | XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools |
498 | go here. Any other changes to the Perl build process should be listed here. | |
499 | However, any platform-specific changes should be listed in the | |
500 | L</Platform Support> section, instead. | |
cdc10f43 | 501 | |
0890f1a5 | 502 | [ List changes as a =item entry ]. |
bdab33d1 | 503 | |
34dc2ec0 | 504 | =over 4 |
d430b8e7 FC |
505 | |
506 | =item * | |
507 | ||
0890f1a5 | 508 | XXX |
bdab33d1 DG |
509 | |
510 | =back | |
511 | ||
0890f1a5 | 512 | =head1 Testing |
bdab33d1 | 513 | |
0890f1a5 FC |
514 | XXX Any significant changes to the testing of a freshly built perl should be |
515 | listed here. Changes which create B<new> files in F<t/> go here as do any | |
516 | large changes to the testing harness (e.g. when parallel testing was added). | |
517 | Changes to existing files in F<t/> aren't worth summarising, although the bugs | |
518 | that they represent may be covered elsewhere. | |
f5938650 | 519 | |
0890f1a5 | 520 | [ List each test improvement as a =item entry ] |
f5938650 | 521 | |
0890f1a5 | 522 | =over 4 |
f5938650 FC |
523 | |
524 | =item * | |
525 | ||
2b679393 SM |
526 | F<t/run/dtrace.t> was added to test Perl's DTrace support. This |
527 | test will only be run if your Perl was built with C<-Dusedtrace> | |
528 | and if calling C<dtrace> actually lets you instrument code. This | |
529 | generally requires being run as root, so this test file is primarily | |
530 | intended for use by the dtrace subcommittee of p5p. | |
f5938650 FC |
531 | |
532 | =back | |
2fbb14a0 | 533 | |
0890f1a5 | 534 | =head1 Platform Support |
975dff8c | 535 | |
0890f1a5 | 536 | XXX Any changes to platform support should be listed in the sections below. |
975dff8c | 537 | |
0890f1a5 FC |
538 | [ Within the sections, list each platform as a =item entry with specific |
539 | changes as paragraphs below it. ] | |
975dff8c | 540 | |
0890f1a5 | 541 | =head2 New Platforms |
975dff8c | 542 | |
0890f1a5 FC |
543 | XXX List any platforms that this version of perl compiles on, that previous |
544 | versions did not. These will either be enabled by new files in the F<hints/> | |
545 | directories, or new subdirectories and F<README> files at the top level of the | |
546 | source tree. | |
975dff8c | 547 | |
0890f1a5 | 548 | =over 4 |
975dff8c | 549 | |
0890f1a5 | 550 | =item XXX-some-platform |
975dff8c | 551 | |
0890f1a5 | 552 | XXX |
975dff8c FC |
553 | |
554 | =back | |
555 | ||
0890f1a5 | 556 | =head2 Discontinued Platforms |
da507230 | 557 | |
0890f1a5 | 558 | XXX List any platforms that this version of perl no longer compiles on. |
da507230 | 559 | |
0890f1a5 | 560 | =over 4 |
fad4a2e4 | 561 | |
0890f1a5 | 562 | =item XXX-some-platform |
4dbb339a | 563 | |
0890f1a5 | 564 | XXX |
4dbb339a | 565 | |
975dff8c FC |
566 | =back |
567 | ||
0890f1a5 | 568 | =head2 Platform-Specific Notes |
6693394d | 569 | |
0890f1a5 FC |
570 | XXX List any changes for specific platforms. This could include configuration |
571 | and compilation changes or changes in portability/compatibility. However, | |
572 | changes within modules for platforms should generally be listed in the | |
573 | L</Modules and Pragmata> section. | |
6693394d | 574 | |
0890f1a5 | 575 | =over 4 |
6693394d | 576 | |
0890f1a5 | 577 | =item XXX-some-platform |
6693394d | 578 | |
0890f1a5 | 579 | XXX |
6693394d FC |
580 | |
581 | =back | |
582 | ||
0890f1a5 | 583 | =head1 Internal Changes |
6693394d | 584 | |
0890f1a5 FC |
585 | XXX Changes which affect the interface available to C<XS> code go here. |
586 | Other significant internal changes for future core maintainers should | |
587 | be noted as well. | |
bdab33d1 | 588 | |
0890f1a5 | 589 | [ List each change as a =item entry ] |
f5938650 | 590 | |
0890f1a5 | 591 | =over 4 |
f5938650 FC |
592 | |
593 | =item * | |
594 | ||
0890f1a5 | 595 | XXX |
f5938650 | 596 | |
0890f1a5 | 597 | =back |
25aa614d | 598 | |
0890f1a5 | 599 | =head1 Selected Bug Fixes |
87d00a71 | 600 | |
0890f1a5 FC |
601 | XXX Important bug fixes in the core language are summarised here. |
602 | Bug fixes in files in F<ext/> and F<lib/> are best summarised in | |
603 | L</Modules and Pragmata>. | |
87d00a71 | 604 | |
0890f1a5 | 605 | [ List each fix as a =item entry ] |
87d00a71 | 606 | |
0890f1a5 | 607 | =over 4 |
87d00a71 | 608 | |
da507230 FC |
609 | =item * |
610 | ||
fff96ff7 FC |
611 | Applying the :lvalue attribute to subroutine that is already defined does |
612 | not work properly, as the attribute changes the way the sub is compiled. | |
613 | Hence, Perl 5.12 began warning when an attempt is made to apply the | |
614 | attribute to an already defined sub. In such cases, the attribute is | |
615 | discarded. | |
616 | ||
617 | But the change in 5.12 missed the case where custom attributes are also | |
618 | present: that case still silently and ineffectively applied the attribute. | |
619 | That omission has now been corrected. C<sub foo :lvalue :Whatever> (when | |
620 | C<foo> is already defined) now warns about the :lvalue attribute, and does | |
621 | not apply it. | |
da507230 | 622 | |
bb3abb05 FC |
623 | L<attributes.pm|attributes> has likewise been updated to warn and not apply |
624 | the attribute. | |
625 | ||
d25b0d7b FC |
626 | =item * |
627 | ||
4bee03f8 FC |
628 | =for comment |
629 | Not necessary for perl5160delta | |
630 | ||
d25b0d7b FC |
631 | The remaining discrepancies between explicit and implicit return from |
632 | lvalue subroutines have been resolved. They mainly involved which error | |
633 | message to display when a read-only value is returned in lvalue context. | |
634 | Also, returning a PADTMP (the result of most built-ins, like C<index>) in | |
635 | lvalue context is now forbidden for explicit return, as it always has been | |
636 | for implicit return. This is not a regression from 5.14, as all the cases | |
637 | in which it could happen where previously syntax errors. | |
638 | ||
4bee03f8 FC |
639 | =item * |
640 | ||
641 | =for comment | |
642 | Not necessary for perl5160delta | |
643 | ||
644 | Explicitly returning a tied C<my> variable from an lvalue subroutine in | |
645 | list lvalue context used to clear the variable before the assignment could | |
646 | happen. This is something that was missed when explicit return was made to | |
647 | work in 5.15.0. | |
648 | ||
d9463c66 FC |
649 | =item * |
650 | ||
651 | =for comment | |
652 | Not necessary for perl5160delta | |
653 | ||
654 | A minor memory leak, introduced in 5.15.0, has been fixed. It would occur | |
655 | when a hash is freed that has had its current iterator deleted | |
656 | [perl #93454]. | |
657 | ||
7c4c6e7c FC |
658 | =item * |
659 | ||
660 | The C<prototype> function now returns a prototype (the empty string) for | |
661 | the C<__FILE__>, C<__LINE__> and C<__PACKAGE__> directives, instead of | |
662 | dying, as they are indistinguishable syntactically from nullary functions | |
663 | like C<time>. | |
664 | ||
777d9014 FC |
665 | =item * |
666 | ||
667 | A bug affecting lvalue context propagation through nested lvalue subroutine | |
668 | calls has been fixed. Previously, returning a value in nested rvalue | |
669 | context would be treated as lvalue context by the inner subroutine call, | |
670 | resulting in some values (such as read-only values) being rejected. | |
671 | ||
df5b44bd FC |
672 | =item * |
673 | ||
674 | Some core bugs affecting L<Hash::Util> have been fixed: locking a hash | |
675 | element that is a glob copy no longer causes subsequent assignment to it to | |
676 | corrupt the glob, and unlocking a hash element that holds a copy-on-write | |
677 | scalar no longer causes modifications to that scalar to modify other | |
678 | scalars that were sharing the same string buffer. | |
679 | ||
e22e289d FC |
680 | =item * |
681 | ||
7818c927 FC |
682 | C<when> blocks are now capable of returning variables declared inside the |
683 | enclosing C<given> block [perl #93548]. | |
684 | ||
685 | =item * | |
686 | ||
687 | A problem with context propagation when a C<do> block is an argument to | |
688 | C<return> has been fixed. It used to cause undefined to be returned in | |
689 | some cases of a C<return> inside an C<if> block which itself is followed by | |
690 | another C<return>. | |
691 | ||
692 | =item * | |
693 | ||
694 | Calling C<index> with a tainted constant no longer causes constants in | |
695 | subsequently compiled code to become tainted [perl #64804]. | |
696 | ||
697 | =item * | |
698 | ||
e22e289d FC |
699 | The C<SvIsCOW> C macro now returns false for read-only copies of typeglobs, |
700 | such as those created by: | |
701 | ||
702 | $hash{elem} = *foo; | |
703 | Hash::Util::lock_value %hash, 'elem'; | |
704 | ||
705 | It used to return true. | |
706 | ||
42a91c97 FC |
707 | =back |
708 | ||
c71a852f | 709 | =head1 Known Problems |
44691e6f | 710 | |
0890f1a5 FC |
711 | XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any |
712 | tests that had to be C<TODO>ed for the release would be noted here, unless | |
713 | they were specific to a particular platform (see below). | |
bda24d5c | 714 | |
0890f1a5 FC |
715 | This is a list of some significant unfixed bugs, which are regressions |
716 | from either 5.XXX.XXX or 5.XXX.XXX. | |
bda24d5c | 717 | |
0890f1a5 | 718 | [ List each fix as a =item entry ] |
bdb9ba77 | 719 | |
0890f1a5 | 720 | =over 4 |
014fb485 | 721 | |
d8e9570c DG |
722 | =item * |
723 | ||
0890f1a5 | 724 | XXX |
d8e9570c | 725 | |
bdb9ba77 | 726 | =back |
014fb485 | 727 | |
0890f1a5 FC |
728 | =head1 Obituary |
729 | ||
730 | XXX If any significant core contributor has died, we've added a short obituary | |
731 | here. | |
44691e6f | 732 | |
44691e6f AB |
733 | =head1 Acknowledgements |
734 | ||
548e9a3a LB |
735 | Generate this with: |
736 | ||
737 | perl Porting/acknowledgements.pl v5.15.0..HEAD | |
29cf780c | 738 | |
44691e6f AB |
739 | =head1 Reporting Bugs |
740 | ||
741 | If you find what you think is a bug, you might check the articles | |
34dc2ec0 | 742 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
44691e6f AB |
743 | bug database at http://rt.perl.org/perlbug/ . There may also be |
744 | information at http://www.perl.org/ , the Perl Home Page. | |
745 | ||
746 | If you believe you have an unreported bug, please run the L<perlbug> | |
747 | program included with your release. Be sure to trim your bug down | |
748 | to a tiny but sufficient test case. Your bug report, along with the | |
749 | output of C<perl -V>, will be sent off to perlbug@perl.org to be | |
750 | analysed by the Perl porting team. | |
751 | ||
752 | If the bug you are reporting has security implications, which make it | |
753 | inappropriate to send to a publicly archived mailing list, then please send | |
34dc2ec0 | 754 | it to perl5-security-report@perl.org. This points to a closed subscription |
b4707b2a FC |
755 | unarchived mailing list, which includes |
756 | all the core committers, who will be able | |
44691e6f AB |
757 | to help assess the impact of issues, figure out a resolution, and help |
758 | co-ordinate the release of patches to mitigate or fix the problem across all | |
34dc2ec0 DM |
759 | platforms on which Perl is supported. Please only use this address for |
760 | security issues in the Perl core, not for modules independently | |
44691e6f AB |
761 | distributed on CPAN. |
762 | ||
763 | =head1 SEE ALSO | |
764 | ||
765 | The F<Changes> file for an explanation of how to view exhaustive details | |
766 | on what changed. | |
767 | ||
768 | The F<INSTALL> file for how to build Perl. | |
769 | ||
770 | The F<README> file for general stuff. | |
771 | ||
772 | The F<Artistic> and F<Copying> files for copyright information. | |
773 | ||
774 | =cut |