| 1 | =encoding utf8 |
| 2 | |
| 3 | =head1 NAME |
| 4 | |
| 5 | perl5191delta - what is new for perl v5.19.1 |
| 6 | |
| 7 | =head1 DESCRIPTION |
| 8 | |
| 9 | This document describes differences between the 5.19.0 release and the 5.19.1 |
| 10 | release. |
| 11 | |
| 12 | =head1 Core Enhancements |
| 13 | |
| 14 | No new features have been added. |
| 15 | |
| 16 | =head1 Security |
| 17 | |
| 18 | There are no new security issues. |
| 19 | |
| 20 | =head1 Incompatible Changes |
| 21 | |
| 22 | =head2 Most regex engine global state eliminated |
| 23 | |
| 24 | As part of this series of fixes it was necessary to change the API of |
| 25 | Perl_re_intuit_start(). See L</Internal Changes> for more. |
| 26 | |
| 27 | =head2 Locale decimal point character no longer leaks outside of S<C<use locale>> scope |
| 28 | |
| 29 | This is actually a bug fix, but some code has come to rely on the bug |
| 30 | being present, so this change is listed here. The current locale that |
| 31 | the program is running under is not supposed to be visible to Perl code |
| 32 | except within the scope of a S<C<use locale>>. However, until now under |
| 33 | certain circumstances, the character used for a decimal point (often a |
| 34 | comma) leaked outside the scope. If your code is affected by this |
| 35 | change, simply add a S<C<use locale>>. |
| 36 | |
| 37 | =head1 Performance Enhancements |
| 38 | |
| 39 | =over 4 |
| 40 | |
| 41 | =item * |
| 42 | |
| 43 | Perl has a new copy-on-write mechanism that avoids the need to copy the |
| 44 | internal string buffer when assigning from one scalar to another. This |
| 45 | makes copying large strings appear much faster. Modifying one of the two |
| 46 | (or more) strings after an assignment will force a copy internally. This |
| 47 | makes it unnecessary to pass strings by reference for efficiency. |
| 48 | |
| 49 | This feature was already available in 5.18.0, but wasn't enabled by |
| 50 | default. It is the default now, and so you no longer need build perl with |
| 51 | the F<Configure> argument: |
| 52 | |
| 53 | -Accflags=PERL_NEW_COPY_ON_WRITE |
| 54 | |
| 55 | It can be disabled (for now) in a perl build with: |
| 56 | |
| 57 | -Accflags=PERL_NO_COW |
| 58 | |
| 59 | =back |
| 60 | |
| 61 | =head1 Modules and Pragmata |
| 62 | |
| 63 | =head2 Updated Modules and Pragmata |
| 64 | |
| 65 | =over 4 |
| 66 | |
| 67 | =item * |
| 68 | |
| 69 | L<Archive::Tar> has been upgraded from version 1.90 to 1.92. |
| 70 | |
| 71 | =item * |
| 72 | |
| 73 | L<Attribute::Handlers> has been upgraded from version 0.94 to 0.95. |
| 74 | |
| 75 | =item * |
| 76 | |
| 77 | L<autodie> has been upgraded from version 2.13 to 2.19. |
| 78 | |
| 79 | =item * |
| 80 | |
| 81 | L<B> has been upgraded from version 1.42 to 1.43. |
| 82 | |
| 83 | =item * |
| 84 | |
| 85 | L<B::Concise> has been upgraded from version 0.95 to 0.96. |
| 86 | |
| 87 | =item * |
| 88 | |
| 89 | L<B::Deparse> has been upgraded from version 1.20 to 1.21. |
| 90 | |
| 91 | C<foreach my $lexical> is now deparsed correctly with the B<-p> option. |
| 92 | [RT #117081] |
| 93 | |
| 94 | The B<-l> option no longer puts form feeds in the middle of a line when |
| 95 | outputting C<map> and C<grep> blocks. [RT #117311] |
| 96 | |
| 97 | Elements of C<%#>, such as C<$# {foo}> and C<${#}{foo}> are now deparsed |
| 98 | correctly. [RT #117531] |
| 99 | |
| 100 | =item * |
| 101 | |
| 102 | L<Benchmark> has been upgraded from version 1.15 to 1.16. |
| 103 | |
| 104 | =item * |
| 105 | |
| 106 | L<Carp> has been upgraded from version 1.29 to 1.30. |
| 107 | |
| 108 | =item * |
| 109 | |
| 110 | L<Compress::Raw::Bzip2> has been upgraded from version 2.060 to 2.061. |
| 111 | |
| 112 | =item * |
| 113 | |
| 114 | L<Compress::Raw::Zlib> has been upgraded from version 2.060 to 2.061. |
| 115 | |
| 116 | =item * |
| 117 | |
| 118 | L<Config::Perl::V> has been upgraded from version 0.17 to 0.18. |
| 119 | |
| 120 | =item * |
| 121 | |
| 122 | L<CPAN::Meta> has been upgraded from version 2.120921 to 2.131560. |
| 123 | |
| 124 | =item * |
| 125 | |
| 126 | L<Data::Dumper> has been upgraded from version 2.145 to 2.146. |
| 127 | |
| 128 | =item * |
| 129 | |
| 130 | L<DB> has been updated from 1.05 to 1.06 and L<perl5db.pl> from 1.39_10 |
| 131 | to 1.40. |
| 132 | |
| 133 | The call depth allowed by default in the debugger is now 1000 |
| 134 | rather than 100. |
| 135 | |
| 136 | =item * |
| 137 | |
| 138 | L<DB_File> has been upgraded from version 1.827 to 1.828. |
| 139 | |
| 140 | =item * |
| 141 | |
| 142 | L<Encode> has been upgraded from version 2.49 to 2.51. |
| 143 | |
| 144 | =item * |
| 145 | |
| 146 | L<ExtUtils::Install> has been upgraded from version 1.59 to 1.60. |
| 147 | |
| 148 | =item * |
| 149 | |
| 150 | L<ExtUtils::MakeMaker> has been upgraded from version 6.66 to 6.68. |
| 151 | |
| 152 | =item * |
| 153 | |
| 154 | L<ExtUtils::ParseXS> has been upgraded from version 3.18 to 3.19. |
| 155 | |
| 156 | =item * |
| 157 | |
| 158 | L<File::Copy> has been upgraded from version 2.26 to 2.27. |
| 159 | |
| 160 | =item * |
| 161 | |
| 162 | L<File::DosGlob> has been upgraded from version 1.10 to 1.11. |
| 163 | |
| 164 | =item * |
| 165 | |
| 166 | L<File::Fetch> has been upgraded from version 0.38 to 0.42. |
| 167 | |
| 168 | =item * |
| 169 | |
| 170 | L<File::Find> has been upgraded from version 1.23 to 1.24. |
| 171 | |
| 172 | =item * |
| 173 | |
| 174 | L<File::Spec> has been upgraded from version 3.40 to 3.41. |
| 175 | |
| 176 | C<tmpdir> now respects changes to environment variables from which the |
| 177 | temporary directory is derived. [RT #88940] |
| 178 | |
| 179 | =item * |
| 180 | |
| 181 | L<File::Temp> has been upgraded from version 0.23 to 0.2301. |
| 182 | |
| 183 | =item * |
| 184 | |
| 185 | L<Filter::Simple> has been upgraded from version 0.89 to 0.90. |
| 186 | |
| 187 | =item * |
| 188 | |
| 189 | L<Filter::Util::Call> has been upgraded from version 1.45 to 1.49. |
| 190 | |
| 191 | =item * |
| 192 | |
| 193 | L<Getopt::Long> has been upgraded from version 2.39 to 2.4. |
| 194 | |
| 195 | =item * |
| 196 | |
| 197 | L<Hash::Util::FieldHash> has been upgraded from version 1.10 to 1.11. |
| 198 | |
| 199 | =item * |
| 200 | |
| 201 | L<HTTP::Tiny> has been upgraded from version 0.025 to 0.031. |
| 202 | |
| 203 | =item * |
| 204 | |
| 205 | L<IPC::Open3> has been upgraded from version 1.13 to 1.14. |
| 206 | |
| 207 | =item * |
| 208 | |
| 209 | L<Locale::Maketext> has been upgraded from version 1.23 to 1.24. |
| 210 | |
| 211 | =item * |
| 212 | |
| 213 | L<Math::BigInt> has been upgraded from version 1.9991 to 1.9992. |
| 214 | |
| 215 | =item * |
| 216 | |
| 217 | L<Math::BigRat> has been upgraded from version 0.2604 to 0.2606. |
| 218 | |
| 219 | =item * |
| 220 | |
| 221 | L<Module::Build> has been upgraded from version 0.4003 to 0.4005. |
| 222 | |
| 223 | =item * |
| 224 | |
| 225 | L<Module::CoreList> has been upgraded from version 2.91 to 2.92. |
| 226 | |
| 227 | Adds L<Module::CoreList::Utils> which provides information on which core and |
| 228 | dual-life utilities shipped with each version of L<perl>. |
| 229 | |
| 230 | =item * |
| 231 | |
| 232 | L<Module::Metadata> has been upgraded from version 1.000011 to 1.000014. |
| 233 | |
| 234 | =item * |
| 235 | |
| 236 | L<mro> has been upgraded from version 1.11 to 1.12. |
| 237 | |
| 238 | =item * |
| 239 | |
| 240 | L<Net::Ping> has been upgraded from version 2.41 to 2.42. |
| 241 | |
| 242 | =item * |
| 243 | |
| 244 | L<perlfaq> has been upgraded from version 5.0150042 to 5.0150043. |
| 245 | |
| 246 | =item * |
| 247 | |
| 248 | L<Pod::Html> has been upgraded from version 1.18 to 1.19. |
| 249 | |
| 250 | =item * |
| 251 | |
| 252 | L<Pod::Parser> has been upgraded from version 1.60 to 1.61. |
| 253 | |
| 254 | =item * |
| 255 | |
| 256 | L<Pod::Perldoc> has been upgraded from version 3.19 to 3.20. |
| 257 | |
| 258 | =item * |
| 259 | |
| 260 | L<Pod::Usage> has been upgraded from version 1.61 to 1.63. |
| 261 | |
| 262 | =item * |
| 263 | |
| 264 | L<POSIX> has been upgraded from version 1.32 to 1.33. |
| 265 | |
| 266 | =item * |
| 267 | |
| 268 | L<re> has been upgraded from version 0.23 to 0.25. |
| 269 | |
| 270 | =item * |
| 271 | |
| 272 | L<Safe> has been upgraded from version 2.35 to 2.36. |
| 273 | |
| 274 | =item * |
| 275 | |
| 276 | L<Storable> has been upgraded from version 2.42 to 2.43. |
| 277 | |
| 278 | =item * |
| 279 | |
| 280 | L<Sys::Hostname> has been upgraded from version 1.17 to 1.18. |
| 281 | |
| 282 | =item * |
| 283 | |
| 284 | L<Sys::Syslog> has been upgraded from version 0.32 to 0.33. |
| 285 | |
| 286 | =item * |
| 287 | |
| 288 | L<Term::ReadLine> has been upgraded from version 1.12 to 1.13. |
| 289 | |
| 290 | =item * |
| 291 | |
| 292 | L<Test::Harness> has been upgraded from version 3.26 to 3.28 |
| 293 | |
| 294 | Memory usage is dramatically reduced. t/harness now uses about 10% of the |
| 295 | memory used by 3.26 and earlier. |
| 296 | |
| 297 | C<PERL5LIB> is always propagated to a test's C<@INC>, even under C<-T>. |
| 298 | |
| 299 | =item * |
| 300 | |
| 301 | L<threads> has been upgraded from version 1.86 to 1.87. |
| 302 | |
| 303 | =item * |
| 304 | |
| 305 | L<threads::shared> has been upgraded from version 1.43 to 1.44. |
| 306 | |
| 307 | =item * |
| 308 | |
| 309 | L<Tie::File> has been upgraded from version 0.99 to 1.00. |
| 310 | |
| 311 | =item * |
| 312 | |
| 313 | L<Time::Piece> has been upgraded from version 1.20_01 to 1.2002. |
| 314 | |
| 315 | =item * |
| 316 | |
| 317 | L<Unicode::Collate> has been upgraded from version 0.97 to 0.98. |
| 318 | |
| 319 | =item * |
| 320 | |
| 321 | L<Unicode::UCD> has been upgraded from version 0.51 to 0.52. |
| 322 | |
| 323 | A function, L<Unicode::UCD/search_invlist()> is now available to do |
| 324 | search an inversion list or map for a code point. |
| 325 | |
| 326 | =back |
| 327 | |
| 328 | =head1 Documentation |
| 329 | |
| 330 | =head2 Changes to Existing Documentation |
| 331 | |
| 332 | =head3 L<perlfunc> |
| 333 | |
| 334 | =over |
| 335 | |
| 336 | =item * |
| 337 | |
| 338 | C<goto EXPR> is now documented to handle an expression that evalutes to a |
| 339 | code reference as if it was C<goto &$coderef>. This behavior is at least ten |
| 340 | years old. |
| 341 | |
| 342 | =item * |
| 343 | |
| 344 | C<eval EXPR> now has caveats about expanding floating point numbers in some |
| 345 | locales |
| 346 | |
| 347 | =item * |
| 348 | |
| 349 | Noted that C<chop> and C<chomp> can reset the hash iterator |
| 350 | |
| 351 | =item * |
| 352 | |
| 353 | Improved C<fileno> example |
| 354 | |
| 355 | =back |
| 356 | |
| 357 | =head3 L<perlexperiment> |
| 358 | |
| 359 | =over |
| 360 | |
| 361 | =item * |
| 362 | |
| 363 | C<\s> matching C<\cK> is marked experimental |
| 364 | |
| 365 | =item * |
| 366 | |
| 367 | ithreads were accepted in 5.8.0 |
| 368 | |
| 369 | =item * |
| 370 | |
| 371 | Long doubles are not experimental |
| 372 | |
| 373 | =back |
| 374 | |
| 375 | =head3 L<perllocale> |
| 376 | |
| 377 | =over |
| 378 | |
| 379 | =item * |
| 380 | |
| 381 | Update to mention fc(), \F |
| 382 | |
| 383 | =back |
| 384 | |
| 385 | =head3 L<perltrap> |
| 386 | |
| 387 | =over 4 |
| 388 | |
| 389 | =item * |
| 390 | |
| 391 | There is now a L<JavaScript|perltrap/JavaScript Traps> section. |
| 392 | |
| 393 | =back |
| 394 | |
| 395 | =head1 Diagnostics |
| 396 | |
| 397 | The following additions or changes have been made to diagnostic output, |
| 398 | including warnings and fatal error messages. For the complete list of |
| 399 | diagnostic messages, see L<perldiag>. |
| 400 | |
| 401 | =head3 New Warnings |
| 402 | |
| 403 | =over 4 |
| 404 | |
| 405 | =item * |
| 406 | |
| 407 | L<A sequence of multiple spaces in a charnames alias definition is deprecated|perldiag/"A sequence of multiple spaces in a charnames alias definition is deprecated"> |
| 408 | |
| 409 | L<Trailing white-space in a charnames alias definition is deprecated|perldiag/"Trailing white-space in a charnames alias definition is deprecated"> |
| 410 | |
| 411 | These two deprecation warnings involving C<\N{...}> were incorrectly |
| 412 | implemented. They did not warn by default (now they do) and could not be |
| 413 | made fatal via C<< use warnings FATAL => 'deprecated' >> (now they can). |
| 414 | |
| 415 | =back |
| 416 | |
| 417 | =head1 Utility Changes |
| 418 | |
| 419 | =head3 F<bisect.pl> enhancements |
| 420 | |
| 421 | The git bisection tool F<Porting/bisect.pl> has had many enhancements. |
| 422 | |
| 423 | =over 4 |
| 424 | |
| 425 | =item * |
| 426 | |
| 427 | Can optionally run the test case with a timeout. |
| 428 | |
| 429 | =item * |
| 430 | |
| 431 | Can now run in-place in a clean git checkout. |
| 432 | |
| 433 | =item * |
| 434 | |
| 435 | Can run the test case under C<valgrind>. |
| 436 | |
| 437 | =item * |
| 438 | |
| 439 | Can apply user supplied patches and fixes to the source checkout before |
| 440 | building. |
| 441 | |
| 442 | =item * |
| 443 | |
| 444 | Now has fixups to enable building several more historical ranges of bleadperl, |
| 445 | which can be useful for pinpointing the origins of bugs or behaviour changes. |
| 446 | |
| 447 | =back |
| 448 | |
| 449 | It is provided as part of the source distribution but not installed because |
| 450 | it is not self-contained as it relies on being run from within a git |
| 451 | checkout. Note also that it makes no attempt to fix tests, correct runtime |
| 452 | bugs or make something useful to install - its purpose is to make minimal |
| 453 | changes to get any historical revision of interest to build and run as close |
| 454 | as possible to "as-was", and thereby make C<git bisect> easy to use. |
| 455 | |
| 456 | =head1 Platform Support |
| 457 | |
| 458 | =head2 Discontinued Platforms |
| 459 | |
| 460 | =over 4 |
| 461 | |
| 462 | =item DG/UX |
| 463 | |
| 464 | DG/UX was a Unix sold by Data General. The last release was in April 2001. |
| 465 | It only runs on Data General's own hardware. |
| 466 | |
| 467 | =back |
| 468 | |
| 469 | =head2 Platform-Specific Notes |
| 470 | |
| 471 | =over 4 |
| 472 | |
| 473 | =item Mixed-endian platforms |
| 474 | |
| 475 | The code supporting C<pack> and C<unpack> operations on mixed endian |
| 476 | platforms has been removed. We believe that Perl has long been unable to |
| 477 | build on mixed endian architectures (such as PDP-11s), so we don't think |
| 478 | that this change will affect any platforms which are able to build v5.18.0. |
| 479 | |
| 480 | =item Windows |
| 481 | |
| 482 | The BUILD_STATIC and ALL_STATIC makefile options for linking some or (nearly) |
| 483 | all extensions statically (into perl519.dll, and into a separate |
| 484 | perl-static.exe too) were broken for MinGW builds. This has now been fixed. |
| 485 | |
| 486 | The ALL_STATIC option has also been improved to include the Encode and Win32 |
| 487 | extensions (for both VC++ and MinGW builds). |
| 488 | |
| 489 | =back |
| 490 | |
| 491 | =head1 Internal Changes |
| 492 | |
| 493 | =over 4 |
| 494 | |
| 495 | =item * |
| 496 | |
| 497 | Perl's new copy-on-write mechanism (which is now enabled by default), |
| 498 | allows any C<SvPOK> scalar to be automatically upgraded to a copy-on-write |
| 499 | scalar when copied. A reference count on the string buffer is stored in |
| 500 | the string buffer itself. |
| 501 | |
| 502 | For example: |
| 503 | |
| 504 | $ perl -MDevel::Peek -e'$a="abc"; $b = $a; Dump $a; Dump $b' |
| 505 | SV = PV(0x260cd80) at 0x2620ad8 |
| 506 | REFCNT = 1 |
| 507 | FLAGS = (POK,IsCOW,pPOK) |
| 508 | PV = 0x2619bc0 "abc"\0 |
| 509 | CUR = 3 |
| 510 | LEN = 16 |
| 511 | COW_REFCNT = 1 |
| 512 | SV = PV(0x260ce30) at 0x2620b20 |
| 513 | REFCNT = 1 |
| 514 | FLAGS = (POK,IsCOW,pPOK) |
| 515 | PV = 0x2619bc0 "abc"\0 |
| 516 | CUR = 3 |
| 517 | LEN = 16 |
| 518 | COW_REFCNT = 1 |
| 519 | |
| 520 | Note that both scalars share the same PV buffer and have a COW_REFCNT |
| 521 | greater than zero. |
| 522 | |
| 523 | This means that XS code which wishes to modify the C<SvPVX()> buffer of an |
| 524 | SV should call C<SvPV_force()> or similar first, to ensure a valid (and |
| 525 | unshared) buffer, and to call C<SvSETMAGIC()> afterwards. This in fact has |
| 526 | always been the case (for example hash keys were already copy-on-write); |
| 527 | this change just spreads the COW behaviour to a wider variety of SVs. |
| 528 | |
| 529 | One important difference is that before 5.18.0, shared hash-key scalars |
| 530 | used to have the C<SvREADONLY> flag set; this is no longer the case. |
| 531 | |
| 532 | This new behaviour can still be disabled by running F<Configure> with |
| 533 | B<-Accflags=-DPERL_NO_COW>. This option will probably be removed in Perl |
| 534 | 5.22. |
| 535 | |
| 536 | =item * |
| 537 | |
| 538 | C<PL_sawampersand> is now a constant. The switch this variable provided |
| 539 | (to enable/disable the pre-match copy depending on whether C<$&> had been |
| 540 | seen) has been removed and replaced with copy-on-write, eliminating a few |
| 541 | bugs. |
| 542 | |
| 543 | The previous behaviour can still be enabled by running F<Configure> with |
| 544 | B<-Accflags=-DPERL_SAWAMPERSAND>. |
| 545 | |
| 546 | =item * |
| 547 | |
| 548 | The functions C<my_swap>, C<my_htonl> and C<my_ntohl> have been removed. |
| 549 | It is unclear why these functions were ever marked as I<A>, part of the |
| 550 | API. XS code can't call them directly, as it can't rely on them being |
| 551 | compiled. Unsurprisingly, no code on CPAN references them. |
| 552 | |
| 553 | =item * |
| 554 | |
| 555 | The signature of the C<Perl_re_intuit_start()> regex function has changed; |
| 556 | the function pointer C<intuit> in the regex engine plugin structure |
| 557 | has also changed accordingly. A new parameter, C<strbeg> has been added; |
| 558 | this has the same meaning as the same-named parameter in |
| 559 | C<Perl_regexec_flags>. Previously intuit would try to guess the start of |
| 560 | the string from the passed SV (if any), and would sometimes get it wrong |
| 561 | (e.g. with an overloaded SV). |
| 562 | |
| 563 | =item * |
| 564 | |
| 565 | XS code may use various macros to change the case of a character or code |
| 566 | point (for example C<toLOWER_utf8()>). Only a couple of these were |
| 567 | documented until now; |
| 568 | and now they should be used in preference to calling the underlying |
| 569 | functions. See L<perlapi/Character case changing>. |
| 570 | |
| 571 | =item * |
| 572 | |
| 573 | The code dealt rather inconsistently with uids and gids. Some |
| 574 | places assumed that they could be safely stored in UVs, others |
| 575 | in IVs, others in ints. Four new macros are introduced: |
| 576 | SvUID(), sv_setuid(), SvGID(), and sv_setgid() |
| 577 | |
| 578 | =back |
| 579 | |
| 580 | =head1 Selected Bug Fixes |
| 581 | |
| 582 | =over 4 |
| 583 | |
| 584 | =item * |
| 585 | |
| 586 | The OP allocation code now returns correctly aligned memory in all cases |
| 587 | for C<struct pmop>. Previously it could return memory only aligned to a |
| 588 | 4-byte boundary, which is not correct for an ithreads build with 64 bit IVs |
| 589 | on some 32 bit platforms. Notably, this caused the build to fail completely |
| 590 | on sparc GNU/Linux. [RT #118055] |
| 591 | |
| 592 | =item * |
| 593 | |
| 594 | The debugger's C<man> command been fixed. It was broken in the v5.18.0 |
| 595 | release. The C<man> command is aliased to the names C<doc> and C<perldoc> - |
| 596 | all now work again. |
| 597 | |
| 598 | =item * |
| 599 | |
| 600 | C<@_> is now correctly visible in the debugger, fixing a regression |
| 601 | introduced in v5.18.0's debugger. [RT #118169] |
| 602 | |
| 603 | =item * |
| 604 | |
| 605 | Evaluating large hashes in scalar context is now much faster, as the number |
| 606 | of used chains in the hash is now cached for larger hashes. Smaller hashes |
| 607 | continue not to store it and calculate it when needed, as this saves one IV. |
| 608 | That would be 1 IV overhead for every object built from a hash. [RT #114576] |
| 609 | |
| 610 | =item * |
| 611 | |
| 612 | Fixed a small number of regexp constructions that could either fail to |
| 613 | match or crash perl when the string being matched against was |
| 614 | allocated above the 2GB line on 32-bit systems. [RT #118175] |
| 615 | |
| 616 | =item * |
| 617 | |
| 618 | Perl v5.16 inadvertently introduced a bug whereby calls to XSUBs that were |
| 619 | not visible at compile time were treated as lvalues and could be assigned |
| 620 | to, even when the subroutine was not an lvalue sub. This has been fixed. |
| 621 | [RT #117947] |
| 622 | |
| 623 | =item * |
| 624 | |
| 625 | In Perl v5.18.0 dualvars that had an empty string for the string part but a |
| 626 | non-zero number for the number part starting being treated as true. In |
| 627 | previous versions they were treated as false, the string representation |
| 628 | taking precedeence. The old behaviour has been restored. [RT #118159] |
| 629 | |
| 630 | =item * |
| 631 | |
| 632 | Since Perl v5.12, inlining of constants that override built-in keywords of |
| 633 | the same name had countermanded C<use subs>, causing subsequent mentions of |
| 634 | the constant to use the built-in keyword instead. This has been fixed. |
| 635 | |
| 636 | =item * |
| 637 | |
| 638 | Lexical constants (C<my sub a() { 42 }>) no longer crash when inlined. |
| 639 | |
| 640 | =item * |
| 641 | |
| 642 | Parameter prototypes attached to lexical subroutines are now respected when |
| 643 | compiling sub calls without parentheses. Previously, the prototypes were |
| 644 | honoured only for calls I<with> parentheses. [RT #116735] |
| 645 | |
| 646 | =item * |
| 647 | |
| 648 | Syntax errors in lexical subroutines in combination with calls to the same |
| 649 | subroutines no longer cause crashes at compile time. |
| 650 | |
| 651 | =item * |
| 652 | |
| 653 | Deep recursion warnings no longer crash lexical subroutines. [RT #118521] |
| 654 | |
| 655 | =item * |
| 656 | |
| 657 | The warning produced by C<-l $handle> now applies to IO refs and globs, not |
| 658 | just to glob refs. That warning is also now UTF8-clean. [RT #117595] |
| 659 | |
| 660 | =item * |
| 661 | |
| 662 | Various memory leaks involving the parsing of the C<(?[...])> regular |
| 663 | expression construct have been fixed. |
| 664 | |
| 665 | =item * |
| 666 | |
| 667 | C<(?[...])> now allows interpolation of precompiled patterns consisting of |
| 668 | C<(?[...])> with bracketed character classes inside (C<$pat = |
| 669 | S<qr/(?[ [a] ])/;> S</(?[ $pat ])/>>). Formerly, the brackets would |
| 670 | confuse the regular expression parser. |
| 671 | |
| 672 | =item * |
| 673 | |
| 674 | The "Quantifier unexpected on zero-length expression" warning message could |
| 675 | appear twice starting in Perl v5.10 for a regular expression also |
| 676 | containing alternations (e.g., "a|b") triggering the trie optimisation. |
| 677 | |
| 678 | =item * |
| 679 | |
| 680 | C<delete local $ENV{nonexistent_env_var}> no longer leaks memory. |
| 681 | |
| 682 | =item * |
| 683 | |
| 684 | C<sort> and C<require> followed by a keyword prefixed with C<CORE::> now |
| 685 | treat it as a keyword, and not as a subroutine or module name. [RT #24482] |
| 686 | |
| 687 | =item * |
| 688 | |
| 689 | Through certain conundrums, it is possible to cause the current package to |
| 690 | be freed. Certain operators (C<bless>, C<reset>, C<open>, C<eval>) could |
| 691 | not cope and would crash. They have been made more resilient. [RT #117941] |
| 692 | |
| 693 | =item * |
| 694 | |
| 695 | Aliasing filehandles through glob-to-glob assignment would not update |
| 696 | internal method caches properly if a package of the same name as the |
| 697 | filehandle existed, resulting in filehandle method calls going to the |
| 698 | package instead. This has been fixed. |
| 699 | |
| 700 | =item * |
| 701 | |
| 702 | C<./Configure -de -Dusevendorprefix> didn't default [RT #64126] |
| 703 | |
| 704 | =item * |
| 705 | |
| 706 | The C<Statement unlikely to be reached> warning was listed in |
| 707 | L<perldiag> as an C<exec>-category warning, but was enabled and disabled |
| 708 | by the C<syntax> category. On the other hand, the C<exec> category |
| 709 | controlled its fatal-ness. It is now entirely handled by the C<exec> |
| 710 | category. |
| 711 | |
| 712 | =item * |
| 713 | |
| 714 | The "Replacement list is longer that search list" warning for C<tr///> and |
| 715 | C<y///> no longer occurs in the presence of the C</c> flag. [RT #118047] |
| 716 | |
| 717 | =item * |
| 718 | |
| 719 | Perl v5.18 inadvertently introduced a bug whereby interpolating mixed up- |
| 720 | and down-graded UTF-8 strings in a regex could result in malformed UTF-8 |
| 721 | in the pattern: specifically if a downgraded character in the range |
| 722 | C<\x80..\xff> followed a UTF-8 string, e.g. |
| 723 | |
| 724 | utf8::upgrade( my $u = "\x{e5}"); |
| 725 | utf8::downgrade(my $d = "\x{e5}"); |
| 726 | /$u$d/ |
| 727 | |
| 728 | [RT #118297] |
| 729 | |
| 730 | =item * |
| 731 | |
| 732 | Stringification of NVs are not cached so that the lexical locale controls |
| 733 | stringification of the decimal point [perl #108378] [perl #115800] |
| 734 | |
| 735 | =back |
| 736 | |
| 737 | =head1 Acknowledgements |
| 738 | |
| 739 | Perl 5.19.1 represents approximately 4 weeks of development since Perl 5.19.0 |
| 740 | and contains approximately 26,000 lines of changes across 680 files from 37 |
| 741 | authors. |
| 742 | |
| 743 | Perl continues to flourish into its third decade thanks to a vibrant community |
| 744 | of users and developers. The following people are known to have contributed the |
| 745 | improvements that became Perl 5.19.1: |
| 746 | |
| 747 | Alexandr Ciornii, Brian Fraser, Chris 'BinGOs' Williams, Craig A. Berry, |
| 748 | Dagfinn Ilmari Mannsåker, Daniel Dragan, David Golden, David Mitchell, David |
| 749 | Steinbrunner, Dominic Hargreaves, Eric Brine, Father Chrysostomos, H.Merijn |
| 750 | Brand, Heiko Eissfeldt, James E Keenan, Jerry D. Hedden, Kang-min Liu, Karl |
| 751 | Williamson, Leon Timmermans, Lukas Mai, Marcel Grünauer, Mark Jason Dominus, |
| 752 | Max Maischein, Mike Doherty, Nicholas Clark, Paul Green, Peter Martini, Petr |
| 753 | Písař, Ricardo Signes, Shirakata Kentaro, Shlomi Fish, Steffen Müller, Steve |
| 754 | Hay, Sullivan Beck, Tony Cook, Yves Orton, Zsbán Ambrus. |
| 755 | |
| 756 | The list above is almost certainly incomplete as it is automatically generated |
| 757 | from version control history. In particular, it does not include the names of |
| 758 | the (very much appreciated) contributors who reported issues to the Perl bug |
| 759 | tracker. |
| 760 | |
| 761 | Many of the changes included in this version originated in the CPAN modules |
| 762 | included in Perl's core. We're grateful to the entire CPAN community for |
| 763 | helping Perl to flourish. |
| 764 | |
| 765 | For a more complete list of all of Perl's historical contributors, please see |
| 766 | the F<AUTHORS> file in the Perl source distribution. |
| 767 | |
| 768 | =head1 Reporting Bugs |
| 769 | |
| 770 | If you find what you think is a bug, you might check the articles recently |
| 771 | posted to the comp.lang.perl.misc newsgroup and the perl bug database at |
| 772 | http://rt.perl.org/perlbug/ . There may also be information at |
| 773 | http://www.perl.org/ , the Perl Home Page. |
| 774 | |
| 775 | If you believe you have an unreported bug, please run the L<perlbug> program |
| 776 | included with your release. Be sure to trim your bug down to a tiny but |
| 777 | sufficient test case. Your bug report, along with the output of C<perl -V>, |
| 778 | will be sent off to perlbug@perl.org to be analysed by the Perl porting team. |
| 779 | |
| 780 | If the bug you are reporting has security implications, which make it |
| 781 | inappropriate to send to a publicly archived mailing list, then please send it |
| 782 | to perl5-security-report@perl.org. This points to a closed subscription |
| 783 | unarchived mailing list, which includes all the core committers, who will be |
| 784 | able to help assess the impact of issues, figure out a resolution, and help |
| 785 | co-ordinate the release of patches to mitigate or fix the problem across all |
| 786 | platforms on which Perl is supported. Please only use this address for |
| 787 | security issues in the Perl core, not for modules independently distributed on |
| 788 | CPAN. |
| 789 | |
| 790 | =head1 SEE ALSO |
| 791 | |
| 792 | The F<Changes> file for an explanation of how to view exhaustive details on |
| 793 | what changed. |
| 794 | |
| 795 | The F<INSTALL> file for how to build Perl. |
| 796 | |
| 797 | The F<README> file for general stuff. |
| 798 | |
| 799 | The F<Artistic> and F<Copying> files for copyright information. |
| 800 | |
| 801 | =cut |