| 1 | =encoding utf8 |
| 2 | |
| 3 | =head1 NAME |
| 4 | |
| 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 v5.21.5 |
| 9 | |
| 10 | =head1 DESCRIPTION |
| 11 | |
| 12 | This document describes differences between the 5.21.4 release and the 5.21.5 |
| 13 | release. |
| 14 | |
| 15 | If you are upgrading from an earlier release such as 5.21.3, first read |
| 16 | L<perl5214delta>, which describes differences between 5.21.3 and 5.21.4. |
| 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 | |
| 30 | =head2 Perl now supports POSIX 2008 locale currency additions. |
| 31 | |
| 32 | On platforms that are able to handle POSIX.1-2008, the |
| 33 | hash returned by |
| 34 | L<C<POSIX::localeconv()>|perllocale/The localeconv function> |
| 35 | includes the international currency fields added by that version of the |
| 36 | POSIX standard. These are |
| 37 | C<int_n_cs_precedes>, |
| 38 | C<int_n_sep_by_space>, |
| 39 | C<int_n_sign_posn>, |
| 40 | C<int_p_cs_precedes>, |
| 41 | C<int_p_sep_by_space>, |
| 42 | and |
| 43 | C<int_p_sign_posn>. |
| 44 | |
| 45 | =head1 Security |
| 46 | |
| 47 | XXX Any security-related notices go here. In particular, any security |
| 48 | vulnerabilities closed should be noted here rather than in the |
| 49 | L</Selected Bug Fixes> section. |
| 50 | |
| 51 | [ List each security issue as a =head2 entry ] |
| 52 | |
| 53 | =head1 Incompatible Changes |
| 54 | |
| 55 | XXX For a release on a stable branch, this section aspires to be: |
| 56 | |
| 57 | There are no changes intentionally incompatible with 5.XXX.XXX |
| 58 | If any exist, they are bugs, and we request that you submit a |
| 59 | report. See L</Reporting Bugs> below. |
| 60 | |
| 61 | [ List each incompatible change as a =head2 entry ] |
| 62 | |
| 63 | =head1 Deprecations |
| 64 | |
| 65 | XXX Any deprecated features, syntax, modules etc. should be listed here. |
| 66 | |
| 67 | =head2 Module removals |
| 68 | |
| 69 | XXX Remove this section if inapplicable. |
| 70 | |
| 71 | The following modules will be removed from the core distribution in a |
| 72 | future release, and will at that time need to be installed from CPAN. |
| 73 | Distributions on CPAN which require these modules will need to list them as |
| 74 | prerequisites. |
| 75 | |
| 76 | The core versions of these modules will now issue C<"deprecated">-category |
| 77 | warnings to alert you to this fact. To silence these deprecation warnings, |
| 78 | install the modules in question from CPAN. |
| 79 | |
| 80 | Note that these are (with rare exceptions) fine modules that you are encouraged |
| 81 | to continue to use. Their disinclusion from core primarily hinges on their |
| 82 | necessity to bootstrapping a fully functional, CPAN-capable Perl installation, |
| 83 | not usually on concerns over their design. |
| 84 | |
| 85 | =over |
| 86 | |
| 87 | =item XXX |
| 88 | |
| 89 | XXX Note that deprecated modules should be listed here even if they are listed |
| 90 | as an updated module in the L</Modules and Pragmata> section. |
| 91 | |
| 92 | =back |
| 93 | |
| 94 | [ List each other deprecation as a =head2 entry ] |
| 95 | |
| 96 | =head1 Performance Enhancements |
| 97 | |
| 98 | XXX Changes which enhance performance without changing behaviour go here. |
| 99 | There may well be none in a stable release. |
| 100 | |
| 101 | [ List each enhancement as a =item entry ] |
| 102 | |
| 103 | =over 4 |
| 104 | |
| 105 | =item * |
| 106 | |
| 107 | C<length> is up to 20% faster for non-magical/non-tied scalars containing a |
| 108 | string if it is a non-utf8 string or if C<use bytes;> is in scope. |
| 109 | |
| 110 | =item * |
| 111 | |
| 112 | Non-magical/non-tied scalars that contain only a floating point value and are |
| 113 | on most Perl builds with 64 bit integers now use 8-32 less bytes of memory |
| 114 | depending on OS. |
| 115 | |
| 116 | =back |
| 117 | |
| 118 | =head1 Modules and Pragmata |
| 119 | |
| 120 | XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/> |
| 121 | go here. If Module::CoreList is updated, generate an initial draft of the |
| 122 | following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary |
| 123 | for important changes should then be added by hand. In an ideal world, |
| 124 | dual-life modules would have a F<Changes> file that could be cribbed. |
| 125 | |
| 126 | [ Within each section, list entries as a =item entry ] |
| 127 | |
| 128 | =head2 New Modules and Pragmata |
| 129 | |
| 130 | =over 4 |
| 131 | |
| 132 | =item * |
| 133 | |
| 134 | XXX |
| 135 | |
| 136 | =back |
| 137 | |
| 138 | =head2 Updated Modules and Pragmata |
| 139 | |
| 140 | =over 4 |
| 141 | |
| 142 | =item * |
| 143 | |
| 144 | L<Module::CoreList> has been upgraded from version 5.20140920 to 5.20141020. |
| 145 | |
| 146 | Updated to cover the latest releases of Perl. |
| 147 | |
| 148 | =back |
| 149 | |
| 150 | =head2 Removed Modules and Pragmata |
| 151 | |
| 152 | =over 4 |
| 153 | |
| 154 | =item * |
| 155 | |
| 156 | XXX |
| 157 | |
| 158 | =back |
| 159 | |
| 160 | =head1 Documentation |
| 161 | |
| 162 | XXX Changes to files in F<pod/> go here. Consider grouping entries by |
| 163 | file and be sure to link to the appropriate page, e.g. L<perlfunc>. |
| 164 | |
| 165 | =head2 New Documentation |
| 166 | |
| 167 | XXX Changes which create B<new> files in F<pod/> go here. |
| 168 | |
| 169 | =head3 L<XXX> |
| 170 | |
| 171 | XXX Description of the purpose of the new file here |
| 172 | |
| 173 | =head2 Changes to Existing Documentation |
| 174 | |
| 175 | XXX Changes which significantly change existing files in F<pod/> go here. |
| 176 | However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics> |
| 177 | section. |
| 178 | |
| 179 | =head3 L<XXX> |
| 180 | |
| 181 | =over 4 |
| 182 | |
| 183 | =item * |
| 184 | |
| 185 | XXX Description of the change here |
| 186 | |
| 187 | =back |
| 188 | |
| 189 | =head1 Diagnostics |
| 190 | |
| 191 | The following additions or changes have been made to diagnostic output, |
| 192 | including warnings and fatal error messages. For the complete list of |
| 193 | diagnostic messages, see L<perldiag>. |
| 194 | |
| 195 | XXX New or changed warnings emitted by the core's C<C> code go here. Also |
| 196 | include any changes in L<perldiag> that reconcile it to the C<C> code. |
| 197 | |
| 198 | =head2 New Diagnostics |
| 199 | |
| 200 | XXX Newly added diagnostic messages go under here, separated into New Errors |
| 201 | and New Warnings |
| 202 | |
| 203 | =head3 New Errors |
| 204 | |
| 205 | =over 4 |
| 206 | |
| 207 | =item * |
| 208 | |
| 209 | XXX L<message|perldiag/"message"> |
| 210 | |
| 211 | =back |
| 212 | |
| 213 | =head3 New Warnings |
| 214 | |
| 215 | =over 4 |
| 216 | |
| 217 | =item * |
| 218 | |
| 219 | XXX L<message|perldiag/"message"> |
| 220 | |
| 221 | =back |
| 222 | |
| 223 | =head2 Changes to Existing Diagnostics |
| 224 | |
| 225 | XXX Changes (i.e. rewording) of diagnostic messages go here |
| 226 | |
| 227 | =over 4 |
| 228 | |
| 229 | =item * |
| 230 | |
| 231 | XXX Describe change here |
| 232 | |
| 233 | =back |
| 234 | |
| 235 | =head1 Utility Changes |
| 236 | |
| 237 | XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here. |
| 238 | Most of these are built within the directory F<utils>. |
| 239 | |
| 240 | [ List utility changes as a =head2 entry for each utility and =item |
| 241 | entries for each change |
| 242 | Use L<XXX> with program names to get proper documentation linking. ] |
| 243 | |
| 244 | =head2 L<XXX> |
| 245 | |
| 246 | =over 4 |
| 247 | |
| 248 | =item * |
| 249 | |
| 250 | XXX |
| 251 | |
| 252 | =back |
| 253 | |
| 254 | =head1 Configuration and Compilation |
| 255 | |
| 256 | XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools |
| 257 | go here. Any other changes to the Perl build process should be listed here. |
| 258 | However, any platform-specific changes should be listed in the |
| 259 | L</Platform Support> section, instead. |
| 260 | |
| 261 | [ List changes as a =item entry ]. |
| 262 | |
| 263 | =over 4 |
| 264 | |
| 265 | =item * |
| 266 | |
| 267 | XXX |
| 268 | |
| 269 | =back |
| 270 | |
| 271 | =head1 Testing |
| 272 | |
| 273 | XXX Any significant changes to the testing of a freshly built perl should be |
| 274 | listed here. Changes which create B<new> files in F<t/> go here as do any |
| 275 | large changes to the testing harness (e.g. when parallel testing was added). |
| 276 | Changes to existing files in F<t/> aren't worth summarizing, although the bugs |
| 277 | that they represent may be covered elsewhere. |
| 278 | |
| 279 | [ List each test improvement as a =item entry ] |
| 280 | |
| 281 | =over 4 |
| 282 | |
| 283 | =item * |
| 284 | |
| 285 | XXX |
| 286 | |
| 287 | =back |
| 288 | |
| 289 | =head1 Platform Support |
| 290 | |
| 291 | XXX Any changes to platform support should be listed in the sections below. |
| 292 | |
| 293 | [ Within the sections, list each platform as a =item entry with specific |
| 294 | changes as paragraphs below it. ] |
| 295 | |
| 296 | =head2 New Platforms |
| 297 | |
| 298 | XXX List any platforms that this version of perl compiles on, that previous |
| 299 | versions did not. These will either be enabled by new files in the F<hints/> |
| 300 | directories, or new subdirectories and F<README> files at the top level of the |
| 301 | source tree. |
| 302 | |
| 303 | =over 4 |
| 304 | |
| 305 | =item XXX-some-platform |
| 306 | |
| 307 | XXX |
| 308 | |
| 309 | =back |
| 310 | |
| 311 | =head2 Discontinued Platforms |
| 312 | |
| 313 | XXX List any platforms that this version of perl no longer compiles on. |
| 314 | |
| 315 | =over 4 |
| 316 | |
| 317 | =item XXX-some-platform |
| 318 | |
| 319 | XXX |
| 320 | |
| 321 | =back |
| 322 | |
| 323 | =head2 Platform-Specific Notes |
| 324 | |
| 325 | XXX List any changes for specific platforms. This could include configuration |
| 326 | and compilation changes or changes in portability/compatibility. However, |
| 327 | changes within modules for platforms should generally be listed in the |
| 328 | L</Modules and Pragmata> section. |
| 329 | |
| 330 | =over 4 |
| 331 | |
| 332 | =item XXX-some-platform |
| 333 | |
| 334 | XXX |
| 335 | |
| 336 | =back |
| 337 | |
| 338 | =head1 Internal Changes |
| 339 | |
| 340 | XXX Changes which affect the interface available to C<XS> code go here. Other |
| 341 | significant internal changes for future core maintainers should be noted as |
| 342 | well. |
| 343 | |
| 344 | [ List each change as a =item entry ] |
| 345 | |
| 346 | =over 4 |
| 347 | |
| 348 | =item * |
| 349 | |
| 350 | XXX |
| 351 | |
| 352 | =back |
| 353 | |
| 354 | =head1 Selected Bug Fixes |
| 355 | |
| 356 | XXX Important bug fixes in the core language are summarized here. Bug fixes in |
| 357 | files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>. |
| 358 | |
| 359 | [ List each fix as a =item entry ] |
| 360 | |
| 361 | =over 4 |
| 362 | |
| 363 | =item * |
| 364 | |
| 365 | XXX |
| 366 | |
| 367 | =back |
| 368 | |
| 369 | =head1 Known Problems |
| 370 | |
| 371 | XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any |
| 372 | tests that had to be C<TODO>ed for the release would be noted here. Unfixed |
| 373 | platform specific bugs also go here. |
| 374 | |
| 375 | [ List each fix as a =item entry ] |
| 376 | |
| 377 | =over 4 |
| 378 | |
| 379 | =item * |
| 380 | |
| 381 | XXX |
| 382 | |
| 383 | =back |
| 384 | |
| 385 | =head1 Errata From Previous Releases |
| 386 | |
| 387 | =over 4 |
| 388 | |
| 389 | =item * |
| 390 | |
| 391 | XXX Add anything here that we forgot to add, or were mistaken about, in |
| 392 | the perldelta of a previous release. |
| 393 | |
| 394 | =item * |
| 395 | |
| 396 | SVs of type SVt_NV are now bodyless when a build configure and platform allow |
| 397 | it, specifically C<sizeof(NV) <= sizeof(IV)>. The bodyless trick is the same one |
| 398 | as for IVs since 5.9.2, but for NVs, unlike IVs, is not guarenteed on all |
| 399 | platforms and build configurations. |
| 400 | |
| 401 | =back |
| 402 | |
| 403 | =head1 Obituary |
| 404 | |
| 405 | XXX If any significant core contributor has died, we've added a short obituary |
| 406 | here. |
| 407 | |
| 408 | =head1 Acknowledgements |
| 409 | |
| 410 | XXX Generate this with: |
| 411 | |
| 412 | perl Porting/acknowledgements.pl v5.21.4..HEAD |
| 413 | |
| 414 | =head1 Reporting Bugs |
| 415 | |
| 416 | If you find what you think is a bug, you might check the articles recently |
| 417 | posted to the comp.lang.perl.misc newsgroup and the perl bug database at |
| 418 | https://rt.perl.org/ . There may also be information at |
| 419 | http://www.perl.org/ , the Perl Home Page. |
| 420 | |
| 421 | If you believe you have an unreported bug, please run the L<perlbug> program |
| 422 | included with your release. Be sure to trim your bug down to a tiny but |
| 423 | sufficient test case. Your bug report, along with the output of C<perl -V>, |
| 424 | will be sent off to perlbug@perl.org to be analysed by the Perl porting team. |
| 425 | |
| 426 | If the bug you are reporting has security implications, which make it |
| 427 | inappropriate to send to a publicly archived mailing list, then please send it |
| 428 | to perl5-security-report@perl.org. This points to a closed subscription |
| 429 | unarchived mailing list, which includes all the core committers, who will be |
| 430 | able to help assess the impact of issues, figure out a resolution, and help |
| 431 | co-ordinate the release of patches to mitigate or fix the problem across all |
| 432 | platforms on which Perl is supported. Please only use this address for |
| 433 | security issues in the Perl core, not for modules independently distributed on |
| 434 | CPAN. |
| 435 | |
| 436 | =head1 SEE ALSO |
| 437 | |
| 438 | The F<Changes> file for an explanation of how to view exhaustive details on |
| 439 | what changed. |
| 440 | |
| 441 | The F<INSTALL> file for how to build Perl. |
| 442 | |
| 443 | The F<README> file for general stuff. |
| 444 | |
| 445 | The F<Artistic> and F<Copying> files for copyright information. |
| 446 | |
| 447 | =cut |