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perldelta for #89648/b23eb1831
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1=encoding utf8
2
3=head1 NAME
4
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5[ this is a template for a new perldelta file. Any text flagged as XXX needs
6to be processed before release. ]
7
8perldelta - what is new for perl v5.19.2
e128ab2c 9
4eabcf70 10=head1 DESCRIPTION
6db9054f 11
38663f11 12This document describes differences between the 5.19.1 release and the 5.19.2
e08634c5 13release.
6db9054f 14
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15If you are upgrading from an earlier release such as 5.19.0, first read
16L<perl5191delta>, which describes differences between 5.19.0 and 5.19.1.
42bff0d9 17
38663f11 18=head1 Notice
42bff0d9 19
38663f11 20XXX Any important notices here
d69d1f92 21
38663f11 22=head1 Core Enhancements
287d2d21 23
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24XXX New core language features go here. Summarize user-visible core language
25enhancements. Particularly prominent performance optimisations could go
26here, but most should go in the L</Performance Enhancements> section.
287d2d21 27
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28=head2 More consistent prototype parsing
29
30Multiple semicolons in subroutine prototypes have long been tolerated and
31treated as a single semicolon. There was one case where this did not
32happen. A subroutine whose prototype begins with "*" or ";*" can affect
33whether a bareword is considered a method name or sub call. This now
34applies also to ";;;*".
35
36Whitespace has long been allowed inside subroutine prototypes, so
37C<sub( $ $ )> is equivalent to C<sub($$)>. But it was stripped when the
38subroutine was parse. Hence, whitespace was I<not> allowed in prototypes
39set by C<Scalar::Util::set_prototype>. Now it is permitted, and the parser
40no longer strips whitespace. This means C<prototype &mysub> returns the
41original prototype, whitespace and all.
287d2d21 42
38663f11 43=head1 Security
42bff0d9 44
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45XXX Any security-related notices go here. In particular, any security
46vulnerabilities closed should be noted here rather than in the
47L</Selected Bug Fixes> section.
42bff0d9 48
38663f11 49[ List each security issue as a =head2 entry ]
42bff0d9 50
38663f11 51=head1 Incompatible Changes
42bff0d9 52
38663f11 53XXX For a release on a stable branch, this section aspires to be:
42bff0d9 54
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55 There are no changes intentionally incompatible with 5.XXX.XXX
56 If any exist, they are bugs, and we request that you submit a
57 report. See L</Reporting Bugs> below.
42bff0d9 58
38663f11 59[ List each incompatible change as a =head2 entry ]
42bff0d9 60
38663f11 61=head1 Deprecations
42bff0d9 62
38663f11 63XXX Any deprecated features, syntax, modules etc. should be listed here.
42bff0d9 64
38663f11 65=head2 Module removals
42bff0d9 66
38663f11 67XXX Remove this section if inapplicable.
42bff0d9 68
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69The following modules will be removed from the core distribution in a
70future release, and will at that time need to be installed from CPAN.
71Distributions on CPAN which require these modules will need to list them as
72prerequisites.
42bff0d9 73
38663f11 74The core versions of these modules will now issue C<"deprecated">-category
8c33633d 75warnings to alert you to this fact. To silence these deprecation warnings,
38663f11 76install the modules in question from CPAN.
42bff0d9 77
38663f11 78Note that these are (with rare exceptions) fine modules that you are encouraged
8c33633d 79to continue to use. Their disinclusion from core primarily hinges on their
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80necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
81not usually on concerns over their design.
42bff0d9 82
38663f11 83=over
42bff0d9 84
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85XXX Note that deprecated modules should be listed here even if they are listed
86as an updated module in the L</Modules and Pragmata> section.
42bff0d9 87
38663f11 88=back
42bff0d9 89
38663f11 90[ List each other deprecation as a =head2 entry ]
42bff0d9 91
38663f11 92=head1 Performance Enhancements
42bff0d9 93
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94XXX Changes which enhance performance without changing behaviour go here.
95There may well be none in a stable release.
42bff0d9 96
38663f11 97[ List each enhancement as a =item entry ]
42bff0d9 98
38663f11 99=over 4
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100
101=item *
102
38663f11 103XXX
42bff0d9 104
38663f11 105=back
42bff0d9 106
38663f11 107=head1 Modules and Pragmata
42bff0d9 108
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109XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
110go here. If Module::CoreList is updated, generate an initial draft of the
111following sections using F<Porting/corelist-perldelta.pl>, which prints stub
112entries to STDOUT. Results can be pasted in place of the '=head2' entries
113below. A paragraph summary for important changes should then be added by hand.
114In an ideal world, dual-life modules would have a F<Changes> file that could be
115cribbed.
42bff0d9 116
38663f11 117[ Within each section, list entries as a =item entry ]
42bff0d9 118
38663f11 119=head2 New Modules and Pragmata
42bff0d9 120
38663f11 121=over 4
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122
123=item *
124
38663f11 125XXX
42bff0d9 126
38663f11 127=back
42bff0d9 128
38663f11 129=head2 Updated Modules and Pragmata
42bff0d9 130
38663f11 131=over 4
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132
133=item *
134
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135L<ExtUtils::Embed> has been upgraded from version 1.30 to 1.31
136
137The generated C<C> code now incorporates bug fixes present in
138F<miniperlmain.c>, and has whitespace changes. It now uses
139C<#include "..."> for header files instead of C<< #include <...> >>.
140This should not make any difference, unless programs embedding C<libperl>
141happen to have local and incompatible files named F<EXTERN.h>, F<XSUB.h> or
142F<perl.h>, as these will now be picked up instead of the installed Perl
143headers.
144
145=item *
146
147L<ExtUtils::Miniperl> has been upgraded and given a version of 1.
148Previously it did not have a version number.
149
150C<writemain()> now takes an optional first argument. A reference to a scalar
151is treated as a filename to be opened and written to. Any other reference is
152used as the filehandle to write to. Otherwise the existing default remains,
153to write to C<STDOUT>.
154
155C<writemain()> has been refactored to use functions from L<ExtUtils::Embed>,
156reducing code size and duplication. The internal function C<canon()> has been
157deleted.
158
159=item *
160
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161L<POSIX> has been upgraded from version 1.33 to 1.34.
162
163C<POSIX::AUTOLOAD> will no longer infinitely recurse if the shared
164object fails to load.
42bff0d9 165
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166=item *
167
168L<Storable> has been upgraded from version 2.43 to 2.44.
169
170Calling C<STORABLE_attach> hooks no longer leaks memory. [perl #118829]
171
38663f11 172=back
42bff0d9 173
38663f11 174=head2 Removed Modules and Pragmata
42bff0d9 175
38663f11 176=over 4
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177
178=item *
179
38663f11 180XXX
42bff0d9 181
38663f11 182=back
42bff0d9 183
38663f11 184=head1 Documentation
42bff0d9 185
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186XXX Changes to files in F<pod/> go here. Consider grouping entries by
187file and be sure to link to the appropriate page, e.g. L<perlfunc>.
42bff0d9 188
38663f11 189=head2 New Documentation
42bff0d9 190
38663f11 191XXX Changes which create B<new> files in F<pod/> go here.
42bff0d9 192
38663f11 193=head3 L<XXX>
42bff0d9 194
38663f11 195XXX Description of the purpose of the new file here
42bff0d9 196
38663f11 197=head2 Changes to Existing Documentation
42bff0d9 198
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199XXX Changes which significantly change existing files in F<pod/> go here.
200However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
201section.
dbd04185 202
41f6d116 203=head3 L<perlexperiment>
dbd04185 204
38663f11 205=over 4
583aa5c2 206
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207=item *
208
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209Code in regular expressions, regular expression backtracking verbs,
210and lvalue subroutines are no longer listed as experimental. (This
211also affects L<perlre> and L<perlsub>.)
42bff0d9 212
38663f11 213=back
42bff0d9 214
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215=head3 L<perlfunc>
216
217=over 4
218
219=item *
220
221Since Perl v5.10, it has been possible for subroutines in @INC to return
222a reference to a scalar holding initial source code to prepend to the file.
223This is now documented.
224
225=back
226
38663f11 227=head1 Diagnostics
42bff0d9 228
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229The following additions or changes have been made to diagnostic output,
230including warnings and fatal error messages. For the complete list of
231diagnostic messages, see L<perldiag>.
42bff0d9 232
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233XXX New or changed warnings emitted by the core's C<C> code go here. Also
234include any changes in L<perldiag> that reconcile it to the C<C> code.
42bff0d9 235
38663f11 236=head2 New Diagnostics
42bff0d9 237
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238XXX Newly added diagnostic messages go under here, separated into New Errors
239and New Warnings
42bff0d9 240
38663f11 241=head3 New Errors
42bff0d9 242
38663f11 243=over 4
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244
245=item *
246
38663f11 247XXX L<message|perldiag/"message">
1fdd5e53 248
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249=back
250
38663f11 251=head3 New Warnings
583aa5c2 252
38663f11 253=over 4
583aa5c2 254
b8a02ff1 255=item *
583aa5c2 256
38663f11 257XXX L<message|perldiag/"message">
583aa5c2 258
b8a02ff1 259=back
583aa5c2 260
38663f11 261=head2 Changes to Existing Diagnostics
96d496e4 262
38663f11 263XXX Changes (i.e. rewording) of diagnostic messages go here
b8a02ff1 264
38663f11 265=over 4
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266
267=item *
268
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269Under rare circumstances, one could get a "Can't coerce readonly REF to
270string" instead of the customary "Modification of a read-only value". This
271alternate error message has been removed.
96d496e4 272
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273=item *
274
275"Ambiguous use of * resolved as operator *": This and similar warnings
276about "%" and "&" used to occur in some circumstances where there was no
277operator of the type cited, so the warning was completely wrong. This has
278been fixed [perl #117535, #76910].
279
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280=item *
281
282Warnings about malformed subroutine prototypes are now more consistent in
283how the prototypes are rendered. Some of these warnings would truncate
284prototypes containing nulls. In other cases one warning would suppress
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285another. The warning about illegal characters in prototypes no longer says
286"after '_'" if the bad character came before the underscore.
1310e590 287
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288=item *
289
290L<"Perl folding rules are not up-to-date for 0x%X; please use the perlbug
291utility to report; in regex; marked by <-- HERE in m/%s/"|perldiag/"Perl
292folding rules are not up-to-date for 0x%X; please use the perlbug utility
293to report; in regex; marked by <-- HERE in m/%s/">:
294
295This message is now only in the regexp category, and not in the deprecated
296category. It is still a default (i.e., severe) warning [perl #89648].
297
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298=back
299
38663f11 300=head1 Utility Changes
d7bfa554 301
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302XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
303Most of these are built within the directories F<utils> and F<x2p>.
d7bfa554 304
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305[ List utility changes as a =head3 entry for each utility and =item
306entries for each change
307Use L<XXX> with program names to get proper documentation linking. ]
d7bfa554 308
38663f11 309=head3 L<XXX>
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310
311=over 4
1993add8 312
e9912eaa 313=item *
ec985017 314
38663f11 315XXX
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316
317=back
318
38663f11 319=head1 Configuration and Compilation
583aa5c2 320
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321XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
322go here. Any other changes to the Perl build process should be listed here.
323However, any platform-specific changes should be listed in the
324L</Platform Support> section, instead.
583aa5c2 325
38663f11 326[ List changes as a =item entry ].
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327
328=over 4
71e6aba6 329
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330=item *
331
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332F<installperl> and F<installman>'s option handling has been refactored to use
333L<Getopt::Long>. Both are used by the F<Makefile> C<install> targets, and
334are not installed, so these changes are only likely to affect custom
335installation scripts.
336
337=over 4
338
339=item *
340
341single letter options now also have long names
342
343=item *
344
345invalid options are now rejected
346
347=item *
348
349command line arguments that are not options are now rejected
350
351=item *
352
353Each now has a C<--help> option to display the usage message.
354
355=back
356
357The behaviour for all valid documented invocations is unchanged.
d5f315e8 358
337fb649 359=back
2426c394 360
38663f11 361=head1 Testing
357b01df 362
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363XXX Any significant changes to the testing of a freshly built perl should be
364listed here. Changes which create B<new> files in F<t/> go here as do any
365large changes to the testing harness (e.g. when parallel testing was added).
366Changes to existing files in F<t/> aren't worth summarizing, although the bugs
367that they represent may be covered elsewhere.
4724da03 368
38663f11 369[ List each test improvement as a =item entry ]
357b01df 370
583aa5c2 371=over 4
357b01df 372
583aa5c2 373=item *
357b01df 374
38663f11 375XXX
4724da03 376
38663f11 377=back
4724da03 378
38663f11 379=head1 Platform Support
4724da03 380
38663f11 381XXX Any changes to platform support should be listed in the sections below.
4724da03 382
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383[ Within the sections, list each platform as a =item entry with specific
384changes as paragraphs below it. ]
4724da03 385
38663f11 386=head2 New Platforms
4724da03 387
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388XXX List any platforms that this version of perl compiles on, that previous
389versions did not. These will either be enabled by new files in the F<hints/>
390directories, or new subdirectories and F<README> files at the top level of the
391source tree.
4724da03 392
38663f11 393=over 4
357b01df 394
38663f11 395=item XXX-some-platform
583aa5c2 396
38663f11 397XXX
4724da03 398
38663f11 399=back
583aa5c2 400
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401=head2 Discontinued Platforms
402
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403XXX List any platforms that this version of perl no longer compiles on.
404
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405=over 4
406
38663f11 407=item XXX-some-platform
d7bfa554 408
38663f11 409XXX
d7bfa554 410
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411=back
412
413=head2 Platform-Specific Notes
414
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415XXX List any changes for specific platforms. This could include configuration
416and compilation changes or changes in portability/compatibility. However,
417changes within modules for platforms should generally be listed in the
418L</Modules and Pragmata> section.
583aa5c2 419
38663f11 420=over 4
a34da6c4 421
3a0b4597 422=item MidnightBSD
a34da6c4 423
3a0b4597 424C<objformat> was removed from version 0.4-RELEASE of MidnightBSD and had been
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425deprecated on earlier versions. This caused the build environment to be
426erroneously configured for C<a.out> rather than C<elf>. This has been now
3a0b4597 427been corrected.
a34da6c4 428
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429=back
430
431=head1 Internal Changes
432
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433XXX Changes which affect the interface available to C<XS> code go here. Other
434significant internal changes for future core maintainers should be noted as
435well.
583aa5c2 436
38663f11 437[ List each change as a =item entry ]
583aa5c2 438
38663f11 439=over 4
1de7c8e6 440
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441=item *
442
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443The Makefile shortcut targets for many rarely (or never) used testing and
444profiling targets have been removed, or merged into the only other Makefile
8c33633d 445target that uses them. Specifically, these targets are gone, along with
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446documentation that referenced them or explained how to use them:
447
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448 check.third check.utf16 check.utf8 coretest minitest.prep
449 minitest.utf16 perl.config.dashg perl.config.dashpg
450 perl.config.gcov perl.gcov perl.gprof perl.gprof.config
451 perl.pixie perl.pixie.atom perl.pixie.config perl.pixie.irix
452 perl.third perl.third.config perl.valgrind.config purecovperl
453 pureperl quantperl test.deparse test.taintwarn test.third
454 test.torture test.utf16 test.utf8 test_notty.deparse
455 test_notty.third test_notty.valgrind test_prep.third
456 test_prep.valgrind torturetest ucheck ucheck.third ucheck.utf16
457 ucheck.valgrind utest utest.third utest.utf16 utest.valgrind
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458
459It's still possible to run the relevant commands by "hand" - no underlying
460functionality has been removed.
d7bfa554 461
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462=item *
463
464It is now possible to keep Perl from initializing locale handling.
465For the most part, Perl doesn't pay attention to locale. (See
466L<perllocale>.) Nonetheless, until now, on startup, it has always
467initialized locale handling to the system default, just in case the
468program being executed ends up using locales. (This is one of the first
469things a locale-aware program should do, long before Perl knows if it
470will actually be needed or not.) This works well except when Perl is
471embedded in another application which wants a locale that isn't the
472system default. Now, if the environment variable
473C<PERL_SKIP_LOCALE_INIT> is set at the time Perl is started, this
474initialization step is skipped. Prior to this, on Windows platforms,
475the only workaround for this deficiency was to use a hacked-up copy of
476internal Perl code. Applications that need to use older Perls can
477discover if the embedded Perl they are using needs the workaround by
478testing that the C preprocessor symbol C<HAS_SKIP_LOCALE_INIT> is not
479defined. (RT #38193)
480
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481=item *
482
483C<BmRARE> and C<BmPREVIOUS> have been removed. They were not used anywhere
484and are not part of the API. For XS modules, they are now #defined as 0.
485
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486=item *
487
488C<sv_force_normal>, which usually croaks on read-only values, used to allow
489read-only values to be modified at compile time. This has been changed to
490croak on read-only values regardless. This change uncovered several core
491bugs.
492
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493=back
494
495=head1 Selected Bug Fixes
496
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497XXX Important bug fixes in the core language are summarized here. Bug fixes in
498files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
acfe52c8 499
38663f11 500[ List each fix as a =item entry ]
a2ef523e 501
38663f11 502=over 4
42dd67ca 503
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504=item *
505
52c411a5 506There have been several fixes related to Perl's handling of locales. perl
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507#38193 was described above in L</Internal Changes>.
508Also fixed is #112208 in which the error string in C<$!> displayed as
509garbage in many UTF-8 locales;
510#118197, where the radix (decimal point) character had to be an ASCII
511character (which doesn't work for some non-Western languages);
52c411a5 512and #115808, in which C<POSIX::setlocale()> on failure returned an
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513C<undef> which didn't warn about not being defined even if those
514warnings were enabled.
d7bfa554 515
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516=item *
517
518The dtrace sub-entry probe now works with lexical subs, instead of
519crashing [perl #118305].
520
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521=item *
522
523Compiling a C<split> operator whose third argument is a named constant
524evaulating to 0 no longer causes the constant's value to change.
525
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526=item *
527
528A named constant used as the second argument to C<index> no longer gets
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529coerced to a string if it is a reference, regular expression, dualvar, etc.
530
531=item *
532
533A named constant evaluating to the undefined value used as the second
534argument to C<index> no longer produces "uninitialized" warnings at compile
535time. It will still produce them at run time.
e11f653d 536
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537=item *
538
539When a scalar was returned from a subroutine in @INC, the referenced scalar
540was magically converted into an IO thingy, possibly resulting in "Bizarre
541copy" errors if that scalar continued to be used elsewhere. Now Perl uses
542an internal copy of the scalar instead.
543
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544=item *
545
546Undefining an inlinable lexical subroutine (C<my sub foo() { 42 } undef
547&foo>) would result in a crash if warnings were turned on.
548
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549=item *
550
551Certain uses of the C<sort> operator are optimised to modify an array in
552place, such as C<@a = sort @a>. During the sorting, the array is made
553read-only. If a sort block should happen to die, then the array remained
554read-only even outside the C<sort>. This has been fixed.
555
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556=item *
557
558C<$a> and C<$b> inside a sort block are aliased to the actual arguments to
559C<sort>, so they can be modified through those two variables. This did not
560always work, e.g., for lvalue subs and C<$#ary>, and probably many other
561operators. It works now.
562
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563=item *
564
565The arguments to C<sort> are now all in list context. If the C<sort>
566itself were called in void or scalar context, then I<some>, but not all, of
567the arguments used to be in void or scalar context.
568
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569=item *
570
571Subroutine prototypes with Unicode characters above U+00FF were getting
572mangled during closure cloning. This would happen with subroutines closing
573over lexical variables declared outside, and with lexical subs.
574
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575=item *
576
577In regular expressions containing multiple code blocks, the values of
578C<$1>, C<$2>, etc., set by nested regular expression calls would leak from
579one block to the next. Now these variables always refer to the outer
580regular expression at the start of an embedded block [perl #117917].
581
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582=item *
583
584C<UNIVERSAL::can> now treats its first argument the same way that method
585calls do: Typeglobs and glob references with non-empty IO slots are treated
586as handles, and strings are treated as filehandles, rather than packages,
587if a handle with that name exists [perl #113932].
588
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589=item *
590
591Method calls on typeglobs (e.g., C<< *ARGV->getline >>) used to stringify
592the typeglob and then look it up again. Combined with changes in Perl
5935.18.0, this allowed C<< *foo->bar >> to call methods on the "foo" package
594(like C<< foo->bar >>). In some cases it could cause the method to be
595called on the wrong handle. Now a typeglob argument is treated as a
596handle (just like C<< (\*foo)->bar >>), or, if its IO slot is empty, an
597error is raised.
598
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599=item *
600
601Under copy-on-write builds (the default as of 5.19.1) C<${'_<-e'}[0]> no
602longer gets mangled. This is the first line of input saved for the
603debugger's use for one-liners [perl #118627].
604
38663f11 605=back
d7bfa554 606
38663f11 607=head1 Known Problems
6810f0ad 608
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609XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
610tests that had to be C<TODO>ed for the release would be noted here. Unfixed
611platform specific bugs also go here.
6810f0ad 612
38663f11 613[ List each fix as a =item entry ]
0e417e4d 614
38663f11 615=over 4
14fd9356
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616
617=item *
618
38663f11 619XXX
0e417e4d 620
38663f11 621=back
583aa5c2 622
38663f11 623=head1 Obituary
583aa5c2 624
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625XXX If any significant core contributor has died, we've added a short obituary
626here.
583aa5c2 627
583aa5c2 628=head1 Acknowledgements
a75569c0 629
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630XXX Generate this with:
631
632 perl Porting/acknowledgements.pl v5.19.1..HEAD
f5b73711 633
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634=head1 Reporting Bugs
635
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636If you find what you think is a bug, you might check the articles recently
637posted to the comp.lang.perl.misc newsgroup and the perl bug database at
638http://rt.perl.org/perlbug/ . There may also be information at
639http://www.perl.org/ , the Perl Home Page.
44691e6f 640
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641If you believe you have an unreported bug, please run the L<perlbug> program
642included with your release. Be sure to trim your bug down to a tiny but
643sufficient test case. Your bug report, along with the output of C<perl -V>,
644will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
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645
646If the bug you are reporting has security implications, which make it
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647inappropriate to send to a publicly archived mailing list, then please send it
648to perl5-security-report@perl.org. This points to a closed subscription
649unarchived mailing list, which includes all the core committers, who will be
650able to help assess the impact of issues, figure out a resolution, and help
f9001595 651co-ordinate the release of patches to mitigate or fix the problem across all
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652platforms on which Perl is supported. Please only use this address for
653security issues in the Perl core, not for modules independently distributed on
654CPAN.
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655
656=head1 SEE ALSO
657
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658The F<Changes> file for an explanation of how to view exhaustive details on
659what changed.
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660
661The F<INSTALL> file for how to build Perl.
662
663The F<README> file for general stuff.
664
665The F<Artistic> and F<Copying> files for copyright information.
666
667=cut