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ExtUtils::ParseXS changelog
[perl5.git] / pod / perldelta.pod
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3=for comment
4This has been completed up to 527d644b124fe.
5
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6=head1 NAME
7
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8[ this is a template for a new perldelta file. Any text flagged as
9XXX needs to be processed before release. ]
10
f25d4e05 11perldelta - what is new for perl v5.15.3
760696b8 12
5438d4b8 13=head1 DESCRIPTION
5cd408a2 14
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15This document describes differences between the 5.15.2 release and
16the 5.15.3 release.
5cd408a2 17
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18If you are upgrading from an earlier release such as 5.15.1, first read
19L<perl5152delta>, which describes differences between 5.15.1 and
205.15.2.
062678b2 21
63ac71b9 22=head1 Notice
4185c919 23
63ac71b9 24XXX Any important notices here
0afed34d 25
63ac71b9 26=head1 Core Enhancements
0afed34d 27
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28XXX New core language features go here. Summarise user-visible core language
29enhancements. Particularly prominent performance optimisations could go
30here, but most should go in the L</Performance Enhancements> section.
0afed34d 31
63ac71b9 32[ List each enhancement as a =head2 entry ]
0afed34d 33
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34=head2 More CORE subs are callable through references
35
c148612c 36Perl 5.15.2 introduced subroutines in the CORE namespace. Most of them
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37could only be called as barewords; i.e., they could be aliased at compile
38time and then inlined under new names.
39
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40Almost all of these functions can now be called through references and via
41C<&foo()> syntax, bypassing the prototype. See L<CORE> for a list of the
42exceptions.
d2006265 43
63ac71b9 44=head1 Security
0afed34d 45
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46XXX Any security-related notices go here. In particular, any security
47vulnerabilities closed should be noted here rather than in the
48L</Selected Bug Fixes> section.
135c0b08 49
63ac71b9 50[ List each security issue as a =head2 entry ]
135c0b08 51
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52=head2 C<File::Glob::bsd_glob()> memory error with GLOB_ALTDIRFUNC (CVE-2011-2728).
53
54Calling C<File::Glob::bsd_glob> with the unsupported flag GLOB_ALTDIRFUNC would
55cause an access violation / segfault. A Perl program that accepts a flags value from
56an external source could expose itself to denial of service or arbitrary code
57execution attacks. There are no known exploits in the wild. The problem has been
58corrected by explicitly disabling all unsupported flags and setting unused function
59pointers to null. Bug reported by Clément Lecigne.
60
5438d4b8 61=head1 Incompatible Changes
7818c927 62
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63=head2 $[ has been removed
64
65The array/string index offsetting mechanism, controlled by the C<$[> magic
66variable, has been removed. C<$[> now always reads as zero. Writing a
67zero to it is still permitted, but writing a non-zero value causes an
68exception. Those hopelessly addicted to FORTRAN-style 1-based indexing
69may wish to use the module L<Array::Base>, which provides an independent
70implementation of the index offsetting concept, or L<Classic::Perl>,
71which allows L<Array::Base> to be controlled through assignment to C<$[>.
72
5d1892be 73=head2 User-defined case changing operations.
7b2b001e 74
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75This feature was deprecated in Perl 5.14, and has now been removed.
76The CPAN module L<Unicode::Casing> provides better functionality without
77the drawbacks that this feature had, as are detailed in the 5.14
78documentation:
79L<http://perldoc.perl.org/5.14.0/perlunicode.html#User-Defined-Case-Mappings-%28for-serious-hackers-only%29>
bdb9ba77 80
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81=head2 XSUBs are now 'static'
82
83XSUB C functions are now 'static', that is, they are not visible from
84outside the compilation unit. For the exceedingly rare case where
85this is not desired, a new public macro C<XS_EXTERNAL(name)> can be
86used in place of C<XS(name)>. C<ExtUtils::ParseXS> (C<xsubpp>)
87can be made to declare XSUBs with C<XS_EXTERNAL> using the
88C<EXPORT_XSUB_SYMBOLS> keyword, see L<perlxs> for details.
89
63ac71b9 90=head1 Deprecations
760696b8 91
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92XXX Any deprecated features, syntax, modules etc. should be listed here.
93In particular, deprecated modules should be listed here even if they are
94listed as an updated module in the L</Modules and Pragmata> section.
760696b8 95
63ac71b9 96[ List each deprecation as a =head2 entry ]
760696b8 97
63ac71b9 98=head1 Performance Enhancements
115ff745 99
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100XXX Changes which enhance performance without changing behaviour go here. There
101may well be none in a stable release.
115ff745 102
63ac71b9 103[ List each enhancement as a =item entry ]
115ff745 104
63ac71b9 105=over 4
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106
107=item *
108
63ac71b9 109XXX
1ba7a2fb 110
63ac71b9 111=back
730e5b5b 112
63ac71b9 113=head1 Modules and Pragmata
730e5b5b 114
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115XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
116go here. If Module::CoreList is updated, generate an initial draft of the
117following sections using F<Porting/corelist-perldelta.pl>, which prints stub
118entries to STDOUT. Results can be pasted in place of the '=head2' entries
119below. A paragraph summary for important changes should then be added by hand.
120In an ideal world, dual-life modules would have a F<Changes> file that could be
121cribbed.
730e5b5b 122
63ac71b9 123[ Within each section, list entries as a =item entry ]
730e5b5b 124
63ac71b9 125=head2 New Modules and Pragmata
a30cae0b 126
63ac71b9 127=over 4
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128
129=item *
130
63ac71b9 131XXX
bbc28bfc 132
63ac71b9 133=back
bbc28bfc 134
63ac71b9 135=head2 Updated Modules and Pragmata
e46d9735 136
63ac71b9 137=over 4
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138
139=item *
140
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141L<AnyDBM_File> has been upgraded from version 1.00 to version 1.01.
142
143This is only a minor documentation update.
144
145=item *
146
43c6b706 147L<Archive::Extract> has been upgraded from version 0.52 to version 0.56.
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148
149Resolved an issue where C<unzip> executable was present in C<PATH> on MSWin32
57126352 150
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151=item *
152
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153L<Archive::Tar> has been upgraded from version 1.76 to version 1.78.
154
155=item *
156
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157L<CPANPLUS> has been upgraded from version 0.9109 to version 0.9110.
158
159=item *
160
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161L<CPANPLUS::Dist::Build> has been upgraded from version 0.56 to version 0.58.
162
163=item *
164
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165L<Devel::PPPort> has been upgraded from version 3.19 to version 3.20.
166
167=item *
168
43c6b706 169L<diagnostics> has been upgraded from version 1.24 to version 1.25.
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170
171It now strips out C<SZ<><...>> formatting codes before displaying
172descriptions [perl #94488].
173
174=item *
175
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176L<Data::Dumper> has been upgraded from version 2.133 to version 2.134.
177
178The XS code for sorting hash keys has been simplified slightly.
179
180=item *
181
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182L<ExtUtils::ParseXS> has been upgraded from version 3.04_03 to version 3.04_04.
183
184The handling of C<dVAR> in the generated XS code has been simplified.
185
186=item *
187
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188L<Locale::Codes> has been upgraded from version 3.17 to version 3.18.
189
190The CIA world added non-standard values, so this is no longer used as a source
191of data.
192
193=item *
194
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195L<File::Glob> has been upgraded from version 1.12 to version 1.13.
196
197See L</Security>.
198
199=item *
200
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201L<Filter::Simple> has been upgrade from version 0.87 to 0.88.
202
203It is now better at detecting the end of a pod section. It always checks
204for =cut, instead of checking for =end (if the pod begins with =begin) or
205the end of the paragraph (if the pod begins with =for) [perl #92436].
206
207=item *
208
43c6b706 209L<Math::BigRat> has been upgraded from version 0.2602 to version 0.2603.
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210
211C<int()> on a Math::BigRat object containing -1/2 now creates a
212Math::BigInt containing 0, rather than -0. L<Math::BigInt> does not even
213support negative zero, so the resulting object was actually malformed
214[perl #95530].
215
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216=item *
217
d6ee8587 218L<Module::Metadata> has been upgraded from version 1.000005_01 to version 1.000007.
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219
220=item *
221
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222L<Module::Load::Conditional> has been upgraded from version 0.44 to version 0.46.
223
224=item *
225
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226L<ODBM_File> has been upgraded from version 1.11 to version 1.12.
227
228This is only a minor refactoring of the XS code to bring it closer to the
229other C<?DBM_File> modules.
230
231=item *
232
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233L<perlfaq> has been upgraded from version 5.01500302 to version 5.0150033.
234
235=item *
236
43c6b706 237L<Pod::Simple> has been upgraded from version 3.18 to version 3.19.
60527824 238
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239=item *
240
241L<POSIX> has been upgraded from version 1.24 to version 1.25.
242
243L<POSIX> no longer uses L<AutoLoader>. Any code which was relying on this
244implementation detail was buggy, and may fail as a result of this change.
245The module's Perl code has been considerably simplified, roughly halving
246the number of lines, with no change in functionality.
247
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248=item *
249
250L<XSLoader> has been upgraded from version 0.15 to version 0.16.
251
63ac71b9 252=back
259925f6 253
63ac71b9 254=head2 Removed Modules and Pragmata
6252d2e2 255
63ac71b9 256=over 4
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257
258=item *
259
63ac71b9 260XXX
54e02335 261
63ac71b9 262=back
310913d4 263
63ac71b9 264=head1 Documentation
310913d4 265
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266XXX Changes to files in F<pod/> go here. Consider grouping entries by
267file and be sure to link to the appropriate page, e.g. L<perlfunc>.
7b2b001e 268
63ac71b9 269=head2 New Documentation
7b2b001e 270
b89e9b0d 271=head3 L<perlootut>
7b2b001e 272
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273This a new OO tutorial. It focuses on basic OO concepts, and then recommends
274that readers choose an OO framework from CPAN.
2df9265e 275
63ac71b9 276=head2 Changes to Existing Documentation
2df9265e 277
b89e9b0d 278=head3 L<perlobj>
dc80b0c6 279
63ac71b9 280=over 4
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281
282=item *
283
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284This document has been rewritten from scratch, and its coverage of various OO
285concepts has been expanded.
4eb81ef2 286
63ac71b9 287=back
4eb81ef2 288
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289=head2 Removed Documentation
290
291=head3 Old OO Documentation
292
293All the old OO tutorials, perltoot, perltooc, and perlboot, have been
294removed. The perlbot (bag of object tricks) document has been removed as well.
295
63ac71b9 296=head1 Diagnostics
4eb81ef2 297
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298The following additions or changes have been made to diagnostic output,
299including warnings and fatal error messages. For the complete list of
300diagnostic messages, see L<perldiag>.
82eefd8a 301
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302XXX New or changed warnings emitted by the core's C<C> code go here. Also
303include any changes in L<perldiag> that reconcile it to the C<C> code.
82eefd8a 304
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305[ Within each section, list entries as a =item entry that links to perldiag,
306 e.g.
6252d2e2 307
63ac71b9 308 =item *
6252d2e2 309
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310 L<Invalid version object|perldiag/"Invalid version object">
311]
5213914c 312
63ac71b9 313=head2 New Diagnostics
5213914c 314
63ac71b9 315XXX Newly added diagnostic messages go here
5213914c 316
63ac71b9 317=head3 New Errors
17609435 318
63ac71b9 319=over 4
17609435 320
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321=item *
322
63ac71b9 323XXX L<message|perldiag/"message">
69f26f52 324
5438d4b8 325=back
77ccfaeb 326
63ac71b9 327=head3 New Warnings
c69a30ec 328
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329=over 4
330
331=item *
7c420290 332
63ac71b9 333XXX L<message|perldiag/"message">
7818c927 334
63ac71b9 335=back
7818c927 336
63ac71b9 337=head2 Changes to Existing Diagnostics
dd413713 338
63ac71b9 339XXX Changes (i.e. rewording) of diagnostic messages go here
7818c927 340
5438d4b8 341=over 4
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342
343=item *
344
63ac71b9 345XXX Describe change here
5aeca1f7 346
5438d4b8 347=back
5aeca1f7 348
63ac71b9 349=head1 Utility Changes
0cb4637e 350
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351XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go
352here. Most of these are built within the directories F<utils> and F<x2p>.
0cb4637e 353
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354[ List utility changes as a =head3 entry for each utility and =item
355entries for each change
356Use L<XXX> with program names to get proper documentation linking. ]
4abaf918 357
63ac71b9 358=head3 L<XXX>
4abaf918 359
5438d4b8 360=over 4
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361
362=item *
363
63ac71b9 364XXX
8b00e523 365
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366=back
367
63ac71b9 368=head1 Configuration and Compilation
b908e258 369
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370XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
371go here. Any other changes to the Perl build process should be listed here.
372However, any platform-specific changes should be listed in the
373L</Platform Support> section, instead.
b908e258 374
63ac71b9 375[ List changes as a =item entry ].
b908e258 376
63ac71b9 377=over 4
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378
379=item *
380
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381The file F<global.sym> is no longer needed, and has been removed. It
382contained a list of all exported functions, one of the files generated by
383F<regen/embed.pl> from data in F<embed.fnc> and F<regen/opcodes>. The code
384has been refactored so that the only user of F<global.sym>, F<makedef.pl>,
385now reads F<embed.fnc> and F<regen/opcodes> directly, removing the need to
386store the list of exported functions in an intermediate file.
387
388As F<global.sym> was never installed, this change will not be visible
389outside the build process.
b908e258 390
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391=back
392
63ac71b9 393=head1 Testing
bbc28bfc 394
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395XXX Any significant changes to the testing of a freshly built perl should be
396listed here. Changes which create B<new> files in F<t/> go here as do any
397large changes to the testing harness (e.g. when parallel testing was added).
398Changes to existing files in F<t/> aren't worth summarising, although the bugs
399that they represent may be covered elsewhere.
bbc28bfc 400
63ac71b9 401[ List each test improvement as a =item entry ]
b7188eb5 402
34dc2ec0 403=over 4
42a91c97 404
6693394d 405=item *
42a91c97 406
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407F<t/porting/globvar.t> has been added, to run a sanity check on F<globar.sym>.
408F<globar.sym> is not needed on most *nix platforms, but is for Win32, hence
409previously was it was possible to inadvertently commit changes that worked
410perfectly locally, but broke the build on Win32.
310913d4 411
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412=item *
413
414F<t/op/unlink.t> has been added to test the C<unlink> function.
415
34dc2ec0 416=back
42a91c97 417
0890f1a5 418=head1 Platform Support
975dff8c 419
63ac71b9 420XXX Any changes to platform support should be listed in the sections below.
9cfd094e 421
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422[ Within the sections, list each platform as a =item entry with specific
423changes as paragraphs below it. ]
9cfd094e 424
63ac71b9 425=head2 New Platforms
9cfd094e 426
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427XXX List any platforms that this version of perl compiles on, that previous
428versions did not. These will either be enabled by new files in the F<hints/>
429directories, or new subdirectories and F<README> files at the top level of the
430source tree.
7c4c6e7c 431
5438d4b8 432=over 4
95f7e41f 433
63ac71b9 434=item XXX-some-platform
95f7e41f 435
63ac71b9 436XXX
df5b44bd 437
63ac71b9 438=back
310913d4 439
63ac71b9 440=head2 Discontinued Platforms
310913d4 441
63ac71b9 442XXX List any platforms that this version of perl no longer compiles on.
310913d4 443
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444=over 4
445
446=item XXX-some-platform
447
448XXX
310913d4 449
5438d4b8 450=back
df5b44bd 451
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452=head2 Platform-Specific Notes
453
454XXX List any changes for specific platforms. This could include configuration
455and compilation changes or changes in portability/compatibility. However,
456changes within modules for platforms should generally be listed in the
457L</Modules and Pragmata> section.
e22e289d 458
5438d4b8 459=over 4
7818c927 460
63ac71b9 461=item XXX-some-platform
7818c927 462
63ac71b9 463XXX
f79aa60b 464
63ac71b9 465=back
7818c927 466
63ac71b9 467=head1 Internal Changes
3fdd840f 468
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469XXX Changes which affect the interface available to C<XS> code go here.
470Other significant internal changes for future core maintainers should
471be noted as well.
3fdd840f 472
63ac71b9 473[ List each change as a =item entry ]
7ffa7e75 474
63ac71b9 475=over 4
7ffa7e75 476
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477=item *
478
63ac71b9 479XXX
862b2c43 480
63ac71b9 481=back
c973bd4f 482
63ac71b9 483=head1 Selected Bug Fixes
a6cefd81 484
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485XXX Important bug fixes in the core language are summarised here.
486Bug fixes in files in F<ext/> and F<lib/> are best summarised in
487L</Modules and Pragmata>.
a6cefd81 488
63ac71b9 489[ List each fix as a =item entry ]
c4499eff 490
63ac71b9 491=over 4
c4499eff 492
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493=item *
494
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495In Perl 5.15.0 C<defined(${'$'})> stopped returning true if the C<$$>
496variable had not been used yet. This has been fixed.
497
498=item *
499
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500C<defined(${"..."})>, C<defined(*{"..."})>, etc., used to
501return true for most, but not all built-in variables, if
502they had not been used yet. Many times that new built-in
503variables were added in past versions, this construct was
23496c6e 504not taken into account, so this affected C<${^GLOBAL_PHASE}> and
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505C<${^UTF8CACHE}>, among others. It also used to return false if the
506package name was given as well (C<${"::!"}>) and for subroutines in the
507CORE package [perl #97978] [perl #97492] [perl #97484].
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508
509=item *
510
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511Perl 5.10.0 introduced a similar bug: C<defined(*{"foo"})> where "foo"
512represents the name of a built-in global variable used to return false if
513the variable had never been used before, but only on the I<first> call.
514This, too, has been fixed.
515
516=item *
517
518Various functions that take a filehandle argument in rvalue context
519(C<close>, C<readline>, etc.) used to call C<FETCH> multiple times, if it
520was a tied variable, and warn twice, if it was C<undef> [perl #97482].
521
522=item *
523
524C<close> and similar filehandle functions, when called on built-in global
525variables (like C<$+>), used to die if the variable happened to hold the
526undefined value, instead of producing the usual "Use of uninitialized
527value" warning.
528
529=item *
530
531When autovivified file handles were introduced in Perl 5.6.0, C<readline>
532was inadvertently made to autovivify when called as C<readline($foo)> (but
533not as C<< <$foo> >>). It has now been fixed never to autovivify.
534
535=item *
536
537C<defined ${ $tied_variable }> used to call C<FETCH> multiple times, but
538now calls it just once.
539
540=item *
541
542Some cases of dereferencing a complex expression, such as
543C<${ (), $tied } = 1>, used to call C<FETCH> multiple times, but now call
544it once.
545
546=item *
547
548For a tied variable returning a package name, C<< $tied->method >> used to
549call C<FETCH> multiple times (even up to six!), and sometimes would
550fail to call the method, due to memory corruption.
551
552=item *
553
554Calling an undefined anonymous subroutine (e.g., what $x holds after
555C<undef &{$x = sub{}}>) used to cause a "Not a CODE reference" error, which
556has been corrected to "Undefined subroutine called" [perl #71154].
bbc28bfc 557
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558=item *
559
560Causing C<@DB::args> to be freed between uses of C<caller> no longer
561results in a crash [perl #93320].
562
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563=item *
564
565Since 5.6.0, C<*{ ... }> has been inconsistent in how it treats undefined
566values. It would die in strict mode or lvalue context for most undefined
567values, but would be treated as the empty string (with a warning) for the
568specific scalar return by C<undef()> (C<&PL_sv_undef> internally). This
569has been corrected. C<undef()> is now treated like other undefined
570scalars, as in Perl 5.005.
571
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572=item *
573
574It used to be possible to free the typeglob of a localised array or hash
575(e.g., C<local @{"x"}; delete $::{x}>), resulting in a crash on scope exit.
576
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577=item *
578
579C<setpgrp($foo)> used to be equivalent to C<($foo, setpgrp)>, because
580C<setpgrp> was ignoring its argument if there was just one. Now it is
581equivalent to C<setpgrp($foo,0)>.
582
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583=item *
584
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585Assignments like C<*$tied = \&{"..."}> and C<*glob = $tied> now call FETCH
586only once.
33d4ef81 587
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588=item *
589
590C<chdir>, C<chmod> and C<chown> now always call FETCH if passed a tied
591variable as the last argument. They used to ignore tiedness if the last
592thing return from or assigned to the variable was a typeglob or reference
593to a typeglob.
594
63ac71b9 595=back
bbc28bfc 596
63ac71b9 597=head1 Known Problems
bbc28bfc 598
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599XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
600tests that had to be C<TODO>ed for the release would be noted here, unless
601they were specific to a particular platform (see below).
bbc28bfc 602
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603This is a list of some significant unfixed bugs, which are regressions
604from either 5.XXX.XXX or 5.XXX.XXX.
bbc28bfc 605
63ac71b9 606[ List each fix as a =item entry ]
bbc28bfc 607
63ac71b9 608=over 4
bbc28bfc 609
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610=item *
611
63ac71b9 612XXX
bad4ae38 613
63ac71b9 614=back
ab6ce8ea 615
63ac71b9 616=head1 Obituary
ab6ce8ea 617
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618XXX If any significant core contributor has died, we've added a short obituary
619here.
c62f68e3 620
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621=head1 Acknowledgements
622
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623XXX Generate this with:
624
625 perl Porting/acknowledgements.pl v5.15.2..HEAD
29cf780c 626
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627=head1 Reporting Bugs
628
629If you find what you think is a bug, you might check the articles
34dc2ec0 630recently posted to the comp.lang.perl.misc newsgroup and the perl
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631bug database at http://rt.perl.org/perlbug/ . There may also be
632information at http://www.perl.org/ , the Perl Home Page.
633
634If you believe you have an unreported bug, please run the L<perlbug>
635program included with your release. Be sure to trim your bug down
636to a tiny but sufficient test case. Your bug report, along with the
637output of C<perl -V>, will be sent off to perlbug@perl.org to be
638analysed by the Perl porting team.
639
640If the bug you are reporting has security implications, which make it
641inappropriate to send to a publicly archived mailing list, then please send
34dc2ec0 642it to perl5-security-report@perl.org. This points to a closed subscription
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643unarchived mailing list, which includes
644all the core committers, who will be able
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645to help assess the impact of issues, figure out a resolution, and help
646co-ordinate the release of patches to mitigate or fix the problem across all
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647platforms on which Perl is supported. Please only use this address for
648security issues in the Perl core, not for modules independently
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649distributed on CPAN.
650
651=head1 SEE ALSO
652
653The F<Changes> file for an explanation of how to view exhaustive details
654on what changed.
655
656The F<INSTALL> file for how to build Perl.
657
658The F<README> file for general stuff.
659
660The F<Artistic> and F<Copying> files for copyright information.
661
662=cut