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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 v5.21.3
c68523cb 9
238894db 10=head1 DESCRIPTION
c68523cb 11
13900f93 12This document describes differences between the 5.21.2 release and the 5.21.3
238894db 13release.
c68523cb 14
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15If you are upgrading from an earlier release such as 5.21.1, first read
16L<perl5212delta>, which describes differences between 5.21.1 and 5.21.2.
17
18=head1 Notice
19
20XXX Any important notices here
7065301c 21
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22=head1 Core Enhancements
23
d1f01a63 24=head2 C<defined(@array = LIST)> is no longer fatal
7e957246 25
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26In 5.21.1, C<defined(@array)> was made fatal. This has been relaxed
27to not die if the argument is assigning to an array.
7e957246 28
0346c3a9 29=head1 Security
7e957246 30
6ab3666b 31=head2 The L<Safe> module could allow outside packages to be replaced
13900f93 32
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33Critical bugfix: outside packages could be replaced. L<Safe> has
34been patched to 2.38 to address this.
8bdb3f93 35
13900f93 36=head1 Incompatible Changes
8bdb3f93 37
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38=head2 S<C<use UNIVERSAL '...'>> is now a fatal error
39
40Importing functions from C<UNIVERSAL> has been deprecated since v5.12, and
41is now a fatal error. S<C<"use UNIVERSAL">> without any arguments is still
42allowed.
43
0346c3a9 44=head1 Deprecations
5320b60d 45
13900f93 46XXX Any deprecated features, syntax, modules etc. should be listed here.
36304e49 47
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48[ List each other deprecation as a =head2 entry ]
49
50=head1 Performance Enhancements
51
52XXX Changes which enhance performance without changing behaviour go here.
53There may well be none in a stable release.
54
55[ List each enhancement as a =item entry ]
56
57=over 4
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59=item *
60
13900f93 61XXX
6bb82be0 62
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63=back
64
7ef8b31d 65=head1 Modules and Pragmata
f6f3144e 66
13900f93 67=head2 Updated Modules and Pragmata
7065301c 68
13900f93 69=over 4
7065301c 70
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71=item *
72
830fa6b6 73L<B::Debug> has been upgraded from version 1.19 to 1.21
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74
75=item *
76
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77L<Config::Perl::V> has been upgraded from version 0.20 to 0.22.
78
79=item *
80
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81L<CPAN::Meta> has been upgraded from version 2.141520 to 2.142060.
82
83=item *
84
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85L<CPAN::Meta::Requirements> has been upgraded from version 2.125 to 2.126.
86
87=item *
88
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89L<ExtUtils::Manifest> has been upgraded from version 1.64 to 1.65.
90
91The MANIFEST is now opened with C<:raw>, to prevent C<CRLF>s leaking in.
92
93=item *
94
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95L<HTTP::Tiny> has been upgraded from version 0.043 to 0.047.
96
97=item *
98
796f59e8 99L<perl5db.pl> has been upgraded from version 1.45 to 1.46.
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100
101Fixed the scope level handling of the debugger's C<y> command.
aac7f82f 102
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103=item *
104
105L<POSIX> has been upgraded from version 1.41 to 1.42.
106
107Replaced the thread-unsafe code used to prevent duplicate warning
108messages for using the isxxx() functions. [perl #122476]
109
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110=item *
111
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112L<Safe> has been upgraded from version 2.37 to 2.38.
113
114Critical bugfix: outside packages could be replaced.
115
116=item *
117
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118L<Socket> has been upgraded from version 2.014 to 2.015.
119
120Test suite updates, particularly useful for Solaris and cygwin, and
121a slight change to the pattern used for IPv4 address matching.
122
13900f93 123=back
aac7f82f 124
13900f93 125=head1 Documentation
aac7f82f 126
13900f93 127=head2 Changes to Existing Documentation
6d9b7c7c 128
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129=head3 L<perlexperiment>
130
131=over 4
132
133=item *
134
135Added reference to L<feature>.
136
137=back
138
139=head3 L<perlguts>
140
141=over 4
142
143=item *
144
145Details on C level symbols and libperl.t added.
146
147=back
148
149=head3 L<perlhacktips>
150
151=over 4
152
153=item *
154
155Recommended replacements for tmpfile, atoi, strtol, and strtoul added.
156
157=back
158
159=head3 L<perlop>
160
161=over 4
162
163=item *
164
165ASCII v. EBCDIC clarifications added.
166
167=back
168
169=head3 L<perlsec>
170
171=over 4
172
173=item *
174
175Comments added on algorithmic complexity and tied hashes.
176
177=back
6d9b7c7c 178
2a395b86 179=head3 L<perlvms>
7f55cec0 180
13900f93 181=over 4
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182
183=item *
184
2a395b86 185Updated documentation on environment and shell interaction in VMS.
aac7f82f 186
13900f93 187=back
aac7f82f 188
13900f93 189=head1 Diagnostics
091fed7c 190
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191The following additions or changes have been made to diagnostic output,
192including warnings and fatal error messages. For the complete list of
193diagnostic messages, see L<perldiag>.
902c1f75 194
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195XXX New or changed warnings emitted by the core's C<C> code go here. Also
196include any changes in L<perldiag> that reconcile it to the C<C> code.
2901561d 197
13900f93 198=head2 New Diagnostics
2901561d 199
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200XXX Newly added diagnostic messages go under here, separated into New Errors
201and New Warnings
202
203=head3 New Errors
4594cf53 204
13900f93 205=over 4
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206
207=item *
208
13900f93 209XXX L<message|perldiag/"message">
7065301c 210
13900f93 211=back
58f25ac1 212
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213=head3 New Warnings
214
215=over 4
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216
217=item *
218
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219L<Hexadecimal float: exponent overflow|perldiag/"Hexadecimal float: exponent overflow">
220
221(W overflow) The hexadecimal floating point has larger exponent
222than the floating point supports.
223
224=item *
225
226L<Hexadecimal float: exponent underflow|perldiag/"Hexadecimal float: exponent underflow">
227
228(W overflow) The hexadecimal floating point has smaller exponent
229than the floating point supports.
230
231=item *
232
233L<Hexadecimal float: internal error|perldiag/"Hexadecimal float: internal error">
234
235(F) Something went horribly bad in hexadecimal float handling.
236
237=item *
238
239L<Hexadecimal float: mantissa overflow|perldiag/"Hexadecimal float: mantissa overflow">
240
241(W overflow) The hexadecimal floating point literal had more bits in
242the mantissa (the part between the 0x and the exponent, also known as
243the fraction or the significand) than the floating point supports.
244
245=item *
246
247L<Hexadecimal float: precision loss|perldiag/"Hexadecimal float: precision loss">
248
249(W overflow) The hexadecimal floating point had internally more
250digits than could be output. This can be caused by unsupported
251long double formats, or by 64-bit integers not being available
252(needed to retrieve the digits under some configurations).
253
254=item *
255
256L<Hexadecimal float: unsupported long double format|perldiag/"Hexadecimal float: unsupported long double format">
257
258(F) You have configured Perl to use long doubles but
259the internals of the long double format are unknown,
260therefore the hexadecimal float output is impossible.
5bafdaa4 261
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262=back
263
13900f93 264=head2 Changes to Existing Diagnostics
12042f24 265
13900f93 266XXX Changes (i.e. rewording) of diagnostic messages go here
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267
268=over 4
269
270=item *
271
13900f93 272XXX Describe change here
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273
274=back
275
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276=head1 Configuration and Compilation
277
278XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
279go here. Any other changes to the Perl build process should be listed here.
280However, any platform-specific changes should be listed in the
281L</Platform Support> section, instead.
282
283[ List changes as a =item entry ].
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284
285=over 4
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286
287=item *
288
a5873648 289Internal handling of floating point values has been improved.
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290
291=back
292
13900f93 293=head1 Testing
6d9b7c7c 294
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295XXX Any significant changes to the testing of a freshly built perl should be
296listed here. Changes which create B<new> files in F<t/> go here as do any
297large changes to the testing harness (e.g. when parallel testing was added).
298Changes to existing files in F<t/> aren't worth summarizing, although the bugs
299that they represent may be covered elsewhere.
6d9b7c7c 300
13900f93 301[ List each test improvement as a =item entry ]
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302
303=over 4
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304
305=item *
306
13900f93 307XXX
48867f3d 308
13900f93 309=back
28462159 310
13900f93 311=head1 Platform Support
097675bf 312
13900f93 313XXX Any changes to platform support should be listed in the sections below.
b3211734 314
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315[ Within the sections, list each platform as a =item entry with specific
316changes as paragraphs below it. ]
b3211734 317
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318=head2 Platform-Specific Notes
319
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320XXX List any changes for specific platforms. This could include configuration
321and compilation changes or changes in portability/compatibility. However,
322changes within modules for platforms should generally be listed in the
323L</Modules and Pragmata> section.
324
0346c3a9 325=over 4
7d0ccdba 326
13900f93 327=item XXX-some-platform
7d0ccdba 328
13900f93 329XXX
7d0ccdba 330
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331=back
332
333=head1 Internal Changes
334
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335XXX Changes which affect the interface available to C<XS> code go here. Other
336significant internal changes for future core maintainers should be noted as
337well.
c9fcb674 338
13900f93 339[ List each change as a =item entry ]
ddeaf645 340
13900f93 341=over 4
c9fcb674 342
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343=item *
344
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345Added L<perlapi/sync_locale>.
346Changing the program's locale should be avoided by XS code. Nevertheless,
347certain non-Perl libraries called from XS, such as C<Gtk> do so. When this
348happens, Perl needs to be told that the locale has changed. Use this function
349to do so, before returning to Perl.
c1284011 350
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351=item *
352
353Added L<perlapi/grok_atou> as a safer replacement for atoi and strtol.
354
6d9b7c7c 355=back
c1284011 356
6d9b7c7c 357=head1 Selected Bug Fixes
375f5f06 358
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359XXX Important bug fixes in the core language are summarized here. Bug fixes in
360files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
361
362[ List each fix as a =item entry ]
363
0346c3a9 364=over 4
375f5f06 365
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366=item *
367
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368Failing to compile C<use Foo> in an eval could leave a spurious
369C<BEGIN> subroutine definition, which would produce a "Subroutine
370BEGIN redefined" warning on the next use of C<use>, or other C<BEGIN>
371block. [perl #122107]
2884baee 372
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373=item *
374
375C<method { BLOCK } ARGS> syntax now correctly parses the arguments if they
376begin with an opening brace. [perl #46947]
377
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378=item *
379
380External libraries and Perl may have different ideas of what the locale is.
381This is problematic when parsing version strings if the locale's numeric
382separator has been changed. Version parsing has been patched to ensure
383it handles the locales correctly. [perl #121930]
384
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385=back
386
387=head1 Known Problems
388
389XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
390tests that had to be C<TODO>ed for the release would be noted here. Unfixed
391platform specific bugs also go here.
5af51eb4 392
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393[ List each fix as a =item entry ]
394
395=over 4
5af51eb4 396
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397=item *
398
13900f93 399XXX
412f55bb 400
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401=back
402
13900f93 403=head1 Errata From Previous Releases
24a38d90 404
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405=over 4
406
407=item *
e831f11a 408
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409XXX Add anything here that we forgot to add, or were mistaken about, in
410the perldelta of a previous release.
e831f11a 411
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412=back
413
13900f93 414=head1 Acknowledgements
e831f11a 415
13900f93 416XXX Generate this with:
e831f11a 417
13900f93 418 perl Porting/acknowledgements.pl v5.21.2..HEAD
f5b73711 419
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420=head1 Reporting Bugs
421
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422If you find what you think is a bug, you might check the articles recently
423posted to the comp.lang.perl.misc newsgroup and the perl bug database at
238894db 424https://rt.perl.org/ . There may also be information at
7ef8b31d 425http://www.perl.org/ , the Perl Home Page.
44691e6f 426
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427If you believe you have an unreported bug, please run the L<perlbug> program
428included with your release. Be sure to trim your bug down to a tiny but
429sufficient test case. Your bug report, along with the output of C<perl -V>,
430will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
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431
432If the bug you are reporting has security implications, which make it
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433inappropriate to send to a publicly archived mailing list, then please send it
434to perl5-security-report@perl.org. This points to a closed subscription
435unarchived mailing list, which includes all the core committers, who will be
436able to help assess the impact of issues, figure out a resolution, and help
f9001595 437co-ordinate the release of patches to mitigate or fix the problem across all
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438platforms on which Perl is supported. Please only use this address for
439security issues in the Perl core, not for modules independently distributed on
440CPAN.
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441
442=head1 SEE ALSO
443
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444The F<Changes> file for an explanation of how to view exhaustive details on
445what changed.
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446
447The F<INSTALL> file for how to build Perl.
448
449The F<README> file for general stuff.
450
451The F<Artistic> and F<Copying> files for copyright information.
452
453=cut