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1 | =encoding utf8 |
2 | |
01358b4a |
3 | =head1 NAME |
4 | |
5 | perl5120delta - what is new for perl v5.12.0 |
6 | |
7 | =head1 DESCRIPTION |
8 | |
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9 | This document describes differences between the 5.10.0 release and the |
10 | 5.12.0 release. |
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11 | |
72d4e865 |
12 | Many of the bug fixes in 5.12.0 are already included in the 5.10.1 |
702b4ef6 |
13 | maintenance release. |
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14 | |
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15 | You can see the list of those changes in the 5.10.1 release notes |
16 | (L<perl5101delta>). |
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17 | |
18 | |
b6381718 |
19 | =head1 Core Enhancements |
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20 | |
21 | =head2 New C<package NAME VERSION> syntax |
22 | |
23 | This new syntax allows a module author to set the $VERSION of a namespace |
24 | when the namespace is declared with 'package'. It eliminates the need |
25 | for C<our $VERSION = ...> and similar constructs. E.g. |
26 | |
27 | package Foo::Bar 1.23; |
28 | # $Foo::Bar::VERSION == 1.23 |
29 | |
30 | There are several advantages to this: |
31 | |
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32 | =over |
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33 | |
34 | =item * |
35 | |
36 | C<$VERSION> is parsed in exactly the same way as C<use NAME VERSION> |
37 | |
38 | =item * |
39 | |
40 | C<$VERSION> is set at compile time |
41 | |
42 | =item * |
43 | |
44 | C<$VERSION> is a version object that provides proper overloading of |
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45 | comparison operators so comparing C<$VERSION> to decimal (1.23) or |
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46 | dotted-decimal (v1.2.3) version numbers works correctly. |
47 | |
48 | =item * |
49 | |
50 | Eliminates C<$VERSION = ...> and C<eval $VERSION> clutter |
51 | |
52 | =item * |
53 | |
54 | As it requires VERSION to be a numeric literal or v-string |
55 | literal, it can be statically parsed by toolchain modules |
56 | without C<eval> the way MM-E<gt>parse_version does for C<$VERSION = ...> |
57 | |
e014eb68 |
58 | =back |
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59 | |
60 | It does not break old code with only C<package NAME>, but code that uses |
61 | C<package NAME VERSION> will need to be restricted to perl 5.12.0 or newer |
62 | This is analogous to the change to C<open> from two-args to three-args. |
63 | Users requiring the latest Perl will benefit, and perhaps after several |
64 | years, it will become a standard practice. |
65 | |
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66 | |
67 | However, C<package NAME VERSION> requires a new, 'strict' version |
68 | number format. See L<"Version number formats"> for details. |
69 | |
70 | |
71 | =head2 The C<...> operator |
72 | |
73 | A new operator, C<...>, nicknamed the Yada Yada operator, has been added. |
74 | It is intended to mark placeholder code that is not yet implemented. |
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75 | See L<perlop/"Yada Yada Operator">. |
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76 | |
77 | =head2 Implicit strictures |
78 | |
79 | Using the C<use VERSION> syntax with a version number greater or equal |
80 | to 5.11.0 will lexically enable strictures just like C<use strict> |
81 | would do (in addition to enabling features.) The following: |
82 | |
83 | use 5.12.0; |
84 | |
85 | means: |
86 | |
87 | use strict; |
88 | use feature ':5.12'; |
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89 | |
b6381718 |
90 | =head2 Unicode improvements |
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91 | |
b6381718 |
92 | Perl 5.12 comes with Unicode 5.2, the latest version available to |
93 | us at the time of release. This version of Unicode was released in |
94 | October 2009. See L<http://www.unicode.org/versions/Unicode5.2.0> for |
95 | further details about what's changed in this version of the standard. |
96 | See L<perlunicode> for instructions on installing and using other versions |
97 | of Unicode. |
98 | |
99 | Additionally, Perl's developers have significantly improved Perl's Unicode |
100 | implementation. For full details, see L</Unicode overhaul> below. |
101 | |
102 | =head2 Y2038 compliance |
103 | |
104 | Perl's core time-related functions are now Y2038 compliant. (It may not mean much to you, but your kids will love it!) |
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105 | |
106 | =head2 qr overloading |
107 | |
108 | It is now possible to overload the C<qr//> operator, that is, |
109 | conversion to regexp, like it was already possible to overload |
110 | conversion to boolean, string or number of objects. It is invoked when |
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111 | an object appears on the right hand side of the C<=~> operator or when |
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112 | it is interpolated into a regexp. See L<overload>. |
113 | |
114 | =head2 Pluggable keywords |
115 | |
116 | Extension modules can now cleanly hook into the Perl parser to define |
117 | new kinds of keyword-headed expression and compound statement. The |
118 | syntax following the keyword is defined entirely by the extension. This |
119 | allow a completely non-Perl sublanguage to be parsed inline, with the |
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120 | correct ops cleanly generated. |
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121 | |
122 | See L<perlapi/PL_keyword_plugin> for the mechanism. The Perl core |
123 | source distribution also includes a new module |
124 | L<XS::APItest::KeywordRPN>, which implements reverse Polish notation |
125 | arithmetic via pluggable keywords. This module is mainly used for test |
126 | purposes, and is not normally installed, but also serves as an example |
127 | of how to use the new mechanism. |
128 | |
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129 | Perl's developers consider this feature to be experimental. We may remove |
130 | it or change it in a backwards-incompatible way in Perl 5.14. |
131 | |
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132 | =head2 APIs for more internals |
133 | |
134 | The lowest layers of the lexer and parts of the pad system now have C |
135 | APIs available to XS extensions. These are necessary to support proper |
136 | use of pluggable keywords, but have other uses too. The new APIs are |
137 | experimental, and only cover a small proportion of what would be |
138 | necessary to take full advantage of the core's facilities in these |
139 | areas. It is intended that the Perl 5.13 development cycle will see the |
140 | addition of a full range of clean, supported interfaces. |
141 | |
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142 | Perl's developers consider this feature to be experimental. We may remove |
143 | it or change it in a backwards-incompatible way in Perl 5.14. |
144 | |
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145 | =head2 Overridable function lookup |
146 | |
147 | Where an extension module hooks the creation of rv2cv ops to modify the |
148 | subroutine lookup process, this now works correctly for bareword |
149 | subroutine calls. This means that prototypes on subroutines referenced |
150 | this way will be processed correctly. (Previously bareword subroutine |
151 | names were initially looked up, for parsing purposes, by an unhookable |
152 | mechanism, so extensions could only properly influence subroutine names |
153 | that appeared with an C<&> sigil.) |
154 | |
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155 | =head2 A proper interface for pluggable Method Resolution Orders |
156 | |
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157 | As of Perl 5.12.0 there is a new interface for plugging and using method |
158 | resolution orders other than the default linear depth first search. |
3ab3a109 |
159 | The C3 method resolution order added in 5.10.0 has been re-implemented as |
160 | a plugin, without changing its Perl-space interface. See L<perlmroapi> for |
161 | more information. |
162 | |
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163 | |
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164 | |
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165 | =head2 C<\N> experimental regex escape |
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166 | |
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167 | Perl now supports C<\N>, a new regex escape which you can think of as |
168 | the inverse of C<\n>. It will match any character that is not a newline, |
169 | independently from the presence or absence of the single line match |
170 | modifier C</s>. It is not usable within a character class. C<\N{3}> |
171 | means to match 3 non-newlines; C<\N{5,}> means to match at least 5. |
172 | C<\N{NAME}> still means the character or sequence named C<NAME>, but |
173 | C<NAME> no longer can be things like C<3>, or C<5,>. |
174 | |
175 | This will break a L<custom charnames translator|charnames/CUSTOM |
176 | TRANSLATORS> which allows numbers for character names, as C<\N{3}> will |
177 | now mean to match 3 non-newline characters, and not the character whose |
178 | name is C<3>. (No name defined by the Unicode standard is a number, |
179 | so only custom translators might be affected.) |
180 | |
181 | Perl's developers are somewhat concerned about possible user confusion |
182 | with the existing C<\N{...}> construct which matches characters by their |
183 | Unicode name. Consequently, this feature is experimental. We may remove |
184 | it or change it in a backwards-incompatible way in Perl 5.14. |
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185 | |
186 | =head2 DTrace support |
187 | |
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188 | Perl now has some support for DTrace. See "DTrace support" in F<INSTALL>. |
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189 | |
190 | =head2 Support for C<configure_requires> in CPAN module metadata |
191 | |
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192 | Both C<CPAN> and C<CPANPLUS> now support the C<configure_requires> |
193 | keyword in the F<META.yml> metadata file included in most recent CPAN |
194 | distributions. This allows distribution authors to specify configuration |
195 | prerequisites that must be installed before running F<Makefile.PL> |
196 | or F<Build.PL>. |
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197 | |
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198 | See the documentation for C<ExtUtils::MakeMaker> or C<Module::Build> for |
199 | more on how to specify C<configure_requires> when creating a distribution |
200 | for CPAN. |
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201 | |
202 | =head2 C<each> is now more flexible |
203 | |
204 | The C<each> function can now operate on arrays. |
205 | |
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206 | =head2 C<when> as a statement modifier |
207 | |
208 | C<when> is now allowed to be used as a statement modifier. |
209 | |
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210 | =head2 C<$,> flexibility |
211 | |
212 | The variable C<$,> may now be tied. |
213 | |
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214 | =head2 // in when clauses |
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215 | |
216 | // now behaves like || in when clauses |
217 | |
218 | =head2 Enabling warnings from your shell environment |
219 | |
220 | You can now set C<-W> from the C<PERL5OPT> environment variable |
221 | |
222 | =head2 C<delete local> |
223 | |
224 | C<delete local> now allows you to locally delete a hash entry. |
225 | |
226 | =head2 New support for Abstract namespace sockets |
227 | |
228 | Abstract namespace sockets are Linux-specific socket type that live in |
229 | AF_UNIX family, slightly abusing it to be able to use arbitrary |
230 | character arrays as addresses: They start with nul byte and are not |
231 | terminated by nul byte, but with the length passed to the socket() |
232 | system call. |
233 | |
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234 | =head2 32-bit limit on substr arguments removed |
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235 | |
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236 | The 32-bit limit on C<substr> arguments has now been removed. The full |
237 | range of the system's signed and unsigned integers is now available for |
238 | the C<pos> and C<len> arguments. |
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239 | |
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240 | =head1 Potentially Incompatible Changes |
3ab3a109 |
241 | |
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242 | =head2 Deprecations warn by default |
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243 | |
62ccb366 |
244 | Over the years, Perl's developers have deprecated a number of language |
245 | features for a variety of reasons. Perl now defaults to issuing a |
246 | warning if a deprecated language feature is used. Many of the deprecations |
247 | Perl now warns you about have been deprecated for many years. You can |
248 | find a list of what was deprecated in a given release of Perl in the |
249 | C<perl5xxdelta.pod> file for that release. |
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250 | |
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251 | To disable this feature in a given lexical scope, you should use C<no |
252 | warnings 'deprecated';> For information about which language features |
253 | are deprecated and explanations of various deprecation warnings, please |
3676dc40 |
254 | see L<perldiag>. See L</Deprecations> below for the list of features |
b6381718 |
255 | and modules Perl's developers have deprecated as part of this release. |
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256 | |
257 | =head2 Version number formats |
258 | |
259 | Acceptable version number formats have been formalized into "strict" and |
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260 | "lax" rules. C<package NAME VERSION> takes a strict version number. |
fab55263 |
261 | C<UNIVERSAL::VERSION> and the L<version> object constructors take lax |
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262 | version numbers. Providing an invalid version will result in a fatal |
263 | error. The version argument in C<use NAME VERSION> is first parsed as a |
fab55263 |
264 | numeric literal or v-string and then passed to C<UNIVERSAL::VERSION> |
265 | (and must then pass the "lax" format test). |
266 | |
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267 | These formats are documented fully in the L<version> module. To a first |
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268 | approximation, a "strict" version number is a positive decimal number |
269 | (integer or decimal-fraction) without exponentiation or else a |
270 | dotted-decimal v-string with a leading 'v' character and at least three |
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271 | components. A "lax" version number allows v-strings with fewer than |
272 | three components or without a leading 'v'. Under "lax" rules, both |
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273 | decimal and dotted-decimal versions may have a trailing "alpha" |
274 | component separated by an underscore character after a fractional or |
275 | dotted-decimal component. |
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276 | |
277 | The L<version> module adds C<version::is_strict> and C<version::is_lax> |
278 | functions to check a scalar against these rules. |
279 | |
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280 | =head2 @INC reorganization |
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281 | |
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282 | In C<@INC>, C<ARCHLIB> and C<PRIVLIB> now occur after after the current |
283 | version's C<site_perl> and C<vendor_perl>. Modules installed into |
284 | C<site_perl> and C<vendor_perl> will now be loaded in preference to |
285 | those installed in C<ARCHLIB> and C<PRIVLIB>. |
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286 | |
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287 | |
288 | =head2 REGEXPs are now first class |
289 | |
290 | Internally, Perl now treates compiled regular expressions (such as |
291 | those created with C<qr//>) as first class entities. Perl modules which |
292 | serialize, deserialize or otherwise have deep interaction with Perl's |
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293 | internal data structures need to be updated for this change. Most |
294 | affected CPAN modules have already been updated as of this writing. |
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295 | |
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296 | =head2 Switch statement changes |
297 | |
b6381718 |
298 | The C<given>/C<when> switch statement handles complex statements better |
299 | than Perl 5.10.0 did (These enhancements are also available in |
300 | 5.10.1 and subsequent 5.10 releases.) There are two new cases where |
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301 | C<when> now interprets its argument as a boolean, instead of an |
302 | expression to be used in a smart match: |
3ab3a109 |
303 | |
b6381718 |
304 | =over |
305 | |
306 | =item flip-flop operators |
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307 | |
308 | The C<..> and C<...> flip-flop operators are now evaluated in boolean |
309 | context, following their usual semantics; see L<perlop/"Range Operators">. |
310 | |
311 | Note that, as in perl 5.10.0, C<when (1..10)> will not work to test |
312 | whether a given value is an integer between 1 and 10; you should use |
313 | C<when ([1..10])> instead (note the array reference). |
314 | |
702b4ef6 |
315 | However, contrary to 5.10.0, evaluating the flip-flop operators in |
316 | boolean context ensures it can now be useful in a C<when()>, notably |
317 | for implementing bistable conditions, like in: |
3ab3a109 |
318 | |
319 | when (/^=begin/ .. /^=end/) { |
320 | # do something |
321 | } |
322 | |
b6381718 |
323 | =item defined-or operator |
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324 | |
325 | A compound expression involving the defined-or operator, as in |
326 | C<when (expr1 // expr2)>, will be treated as boolean if the first |
327 | expression is boolean. (This just extends the existing rule that applies |
328 | to the regular or operator, as in C<when (expr1 || expr2)>.) |
329 | |
b6381718 |
330 | =back |
331 | |
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332 | =head2 Smart match changes |
333 | |
b6381718 |
334 | Since Perl 5.10.0, Perl's developers have made a number of changes to |
335 | the smart match operator. These, of course, also alter the behaviour |
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336 | of the switch statements where smart matching is implicitly used. |
c66407fa |
337 | These changes were also made for the 5.10.1 release, and will remain in |
3ab3a109 |
338 | subsequent 5.10 releases. |
339 | |
3ab3a109 |
340 | =head3 Changes to type-based dispatch |
341 | |
342 | The smart match operator C<~~> is no longer commutative. The behaviour of |
343 | a smart match now depends primarily on the type of its right hand |
344 | argument. Moreover, its semantics have been adjusted for greater |
345 | consistency or usefulness in several cases. While the general backwards |
346 | compatibility is maintained, several changes must be noted: |
347 | |
348 | =over 4 |
349 | |
350 | =item * |
351 | |
352 | Code references with an empty prototype are no longer treated specially. |
353 | They are passed an argument like the other code references (even if they |
354 | choose to ignore it). |
355 | |
356 | =item * |
357 | |
358 | C<%hash ~~ sub {}> and C<@array ~~ sub {}> now test that the subroutine |
359 | returns a true value for each key of the hash (or element of the |
360 | array), instead of passing the whole hash or array as a reference to |
361 | the subroutine. |
362 | |
363 | =item * |
364 | |
365 | Due to the commutativity breakage, code references are no longer |
366 | treated specially when appearing on the left of the C<~~> operator, |
367 | but like any vulgar scalar. |
368 | |
369 | =item * |
370 | |
371 | C<undef ~~ %hash> is always false (since C<undef> can't be a key in a |
372 | hash). No implicit conversion to C<""> is done (as was the case in perl |
373 | 5.10.0). |
374 | |
375 | =item * |
376 | |
377 | C<$scalar ~~ @array> now always distributes the smart match across the |
378 | elements of the array. It's true if one element in @array verifies |
379 | C<$scalar ~~ $element>. This is a generalization of the old behaviour |
380 | that tested whether the array contained the scalar. |
381 | |
382 | =back |
383 | |
384 | The full dispatch table for the smart match operator is given in |
385 | L<perlsyn/"Smart matching in detail">. |
386 | |
387 | =head3 Smart match and overloading |
388 | |
389 | According to the rule of dispatch based on the rightmost argument type, |
390 | when an object overloading C<~~> appears on the right side of the |
391 | operator, the overload routine will always be called (with a 3rd argument |
392 | set to a true value, see L<overload>.) However, when the object will |
393 | appear on the left, the overload routine will be called only when the |
c66407fa |
394 | rightmost argument is a simple scalar. This way, distributivity of smart |
395 | match across arrays is not broken, as well as the other behaviours with |
396 | complex types (coderefs, hashes, regexes). Thus, writers of overloading |
397 | routines for smart match mostly need to worry only with comparing |
398 | against a scalar, and possibly with stringification overloading; the |
399 | other common cases will be automatically handled consistently. |
3ab3a109 |
400 | |
401 | C<~~> will now refuse to work on objects that do not overload it (in order |
402 | to avoid relying on the object's underlying structure). (However, if the |
403 | object overloads the stringification or the numification operators, and |
404 | if overload fallback is active, it will be used instead, as usual.) |
405 | |
b6381718 |
406 | =head2 Other potentially incompatible changes |
3ab3a109 |
407 | |
408 | =over 4 |
409 | |
410 | =item * |
411 | |
b16f1257 |
412 | The definitions of a number of Unicode properties have changed to match |
413 | those of the current Unicode standard. These are listed above under |
702b4ef6 |
414 | L</Unicode overhaul>. This change may break code that expects the old |
415 | definitions. |
3ab3a109 |
416 | |
417 | =item * |
418 | |
b6381718 |
419 | The boolkeys op has moved to the group of hash ops. This breaks binary |
b21d8e53 |
420 | compatibility. |
c66407fa |
421 | |
422 | =item * |
423 | |
72d4e865 |
424 | Filehandles are now always blessed into C<IO::File>. |
c66407fa |
425 | |
426 | The previous behaviour was to bless Filehandles into L<FileHandle> |
427 | (an empty proxy class) if it was loaded into memory and otherwise |
428 | to bless them into C<IO::Handle>. |
429 | |
430 | =item * |
431 | |
432 | The semantics of C<use feature :5.10*> have changed slightly. |
433 | See L<"Modules and Pragmata"> for more information. |
3ab3a109 |
434 | |
435 | =item * |
436 | |
b6381718 |
437 | Perl's developers now use git, rather than Perforce. This should be |
438 | a purely internal change only relevant to people actively working on |
439 | the core. However, you may see minor difference in perl as a consequence |
440 | of the change. For example in some of details of the output of C<perl |
441 | -V>. See L<perlrepository> for more information. |
3ab3a109 |
442 | |
443 | =item * |
444 | |
445 | As part of the C<Test::Harness> 2.x to 3.x upgrade, the experimental |
446 | C<Test::Harness::Straps> module has been removed. |
b6381718 |
447 | See L</"Modules and Pragmata"> for more details. |
3ab3a109 |
448 | |
449 | =item * |
450 | |
451 | As part of the C<ExtUtils::MakeMaker> upgrade, the |
452 | C<ExtUtils::MakeMaker::bytes> and C<ExtUtils::MakeMaker::vmsish> modules |
453 | have been removed from this distribution. |
454 | |
455 | =item * |
456 | |
457 | C<Module::CoreList> no longer contains the C<%:patchlevel> hash. |
458 | |
3ab3a109 |
459 | |
460 | =item * |
461 | |
462 | C<length undef> now returns undef. |
463 | |
464 | =item * |
465 | |
466 | Unsupported private C API functions are now declared "static" to prevent |
467 | leakage to Perl's public API. |
468 | |
469 | =item * |
470 | |
471 | To support the bootstrapping process, F<miniperl> no longer builds with |
472 | UTF-8 support in the regexp engine. |
473 | |
474 | This allows a build to complete with PERL_UNICODE set and a UTF-8 locale. |
702b4ef6 |
475 | Without this there's a bootstrapping problem, as miniperl can't load |
476 | the UTF-8 components of the regexp engine, because they're not yet built. |
3ab3a109 |
477 | |
478 | =item * |
479 | |
c66407fa |
480 | F<miniperl>'s @INC is now restricted to just C<-I...>, the split of |
481 | C<$ENV{PERL5LIB}>, and "C<.>" |
3ab3a109 |
482 | |
483 | =item * |
484 | |
485 | A space or a newline is now required after a C<"#line XXX"> directive. |
486 | |
487 | =item * |
488 | |
702b4ef6 |
489 | Tied filehandles now have an additional method EOF which provides the |
490 | EOF type. |
3ab3a109 |
491 | |
492 | =item * |
493 | |
c66407fa |
494 | To better match all other flow control statements, C<foreach> may no |
495 | longer be used as an attribute. |
3ab3a109 |
496 | |
208f012a |
497 | =item * |
498 | |
499 | Perl's command-line switch "-P", which was deprecated in version 5.10.0, has |
500 | now been removed. |
501 | |
3ab3a109 |
502 | =back |
503 | |
b6381718 |
504 | |
3ab3a109 |
505 | =head1 Deprecations |
506 | |
507 | From time to time, Perl's developers find it necessary to deprecate |
508 | features or modules we've previously shipped as part of the core |
509 | distribution. We are well aware of the pain and frustration that a |
510 | backwards-incompatible change to Perl can cause for developers building |
511 | or maintaining software in Perl. You can be sure that when we deprecate |
512 | a functionality or syntax, it isn't a choice we make lightly. Sometimes, |
513 | we choose to deprecate functionality or syntax because it was found to |
514 | be poorly designed or implemented. Sometimes, this is because they're |
515 | holding back other features or causing performance problems. Sometimes, |
516 | the reasons are more complex. Wherever possible, we try to keep deprecated |
517 | functionality available to developers in its previous form for at least |
72d4e865 |
518 | one major release. So long as a deprecated feature isn't actively |
3ab3a109 |
519 | disrupting our ability to maintain and extend Perl, we'll try to leave |
520 | it in place as long as possible. |
521 | |
b6381718 |
522 | The following items are now deprecated: |
3ab3a109 |
523 | |
b6381718 |
524 | =over |
525 | |
526 | =item suidperl |
527 | |
528 | C<suidperl> is no longer part of Perl. It used to provide a mechanism to |
529 | emulate setuid permission bits on systems that don't support it properly. |
3ab3a109 |
530 | |
b6381718 |
531 | |
532 | =item Use of C<:=> to mean an empty attribute list |
3ab3a109 |
533 | |
534 | An accident of Perl's parser meant that these constructions were all |
535 | equivalent: |
536 | |
537 | my $pi := 4; |
538 | my $pi : = 4; |
539 | my $pi : = 4; |
540 | |
541 | with the C<:> being treated as the start of an attribute list, which |
542 | ends before the C<=>. As whitespace is not significant here, all are |
543 | parsed as an empty attribute list, hence all the above are equivalent |
544 | to, and better written as |
545 | |
546 | my $pi = 4; |
547 | |
548 | because no attribute processing is done for an empty list. |
549 | |
550 | As is, this meant that C<:=> cannot be used as a new token, without |
551 | silently changing the meaning of existing code. Hence that particular |
552 | form is now deprecated, and will become a syntax error. If it is |
553 | absolutely necessary to have empty attribute lists (for example, |
554 | because of a code generator) then avoid the warning by adding a space |
555 | before the C<=>. |
556 | |
c66407fa |
557 | =item C<< UNIVERSAL->import() >> |
3ab3a109 |
558 | |
72d4e865 |
559 | The method C<< UNIVERSAL->import() >> is now deprecated. Attempting to |
3ab3a109 |
560 | pass import arguments to a C<use UNIVERSAL> statement will result in a |
c66407fa |
561 | deprecation warning. |
3ab3a109 |
562 | |
b6381718 |
563 | |
564 | =item Use of "goto" to jump into a construct |
3ab3a109 |
565 | |
c66407fa |
566 | Using C<goto> to jump from an outer scope into an inner scope is now |
567 | deprecated. This rare use case was causing problems in the |
568 | implementation of scopes. |
3ab3a109 |
569 | |
b6381718 |
570 | =item Custom character names in \N{name} that don't look like names |
8c66a230 |
571 | |
702b4ef6 |
572 | In C<\N{I<name>}>, I<name> can be just about anything. The standard |
573 | Unicode names have a very limited domain, but a custom name translator |
574 | could create names that are, for example, made up entirely of punctuation |
575 | symbols. It is now deprecated to make names that don't begin with an |
576 | alphabetic character, and aren't alphanumeric or contain other than |
577 | a very few other characters, namely spaces, dashes, parentheses |
578 | and colons. Because of the added meaning of C<\N> (See L</C<\N> |
579 | experimental regex escape>), names that look like curly brace -enclosed |
580 | quantifiers won't work. For example, C<\N{3,4}> now means to match 3 to |
581 | 4 non-newlines; before a custom name C<3,4> could have been created. |
8c66a230 |
582 | |
3ab3a109 |
583 | =item Deprecated Modules |
584 | |
702b4ef6 |
585 | The following modules will be removed from the core distribution in a |
586 | future release, and should be installed from CPAN instead. Distributions |
587 | on CPAN which require these should add them to their prerequisites. The |
588 | core versions of these modules warnings will issue a deprecation warning. |
3ab3a109 |
589 | |
702b4ef6 |
590 | If you ship a packaged version of Perl, either alone or as part of a |
591 | larger system, then you should carefully consider the reprecussions of |
592 | core module deprecations. You may want to consider shipping your default |
593 | build of Perl with packages for some or all deprecated modules which |
594 | install into C<vendor> or C<site> perl library directories. This will |
595 | inhibit the deprecation warnings. |
8df7d2a3 |
596 | |
597 | Alternatively, you may want to consider patching F<lib/deprecate.pm> |
702b4ef6 |
598 | to provide deprecation warnings specific to your packaging system |
599 | or distribution of Perl, consistent with how your packaging system |
600 | or distribution manages a staged transition from a release where the |
601 | installation of a single package provides the given functionality, to |
602 | a later release where the system administrator needs to know to install |
603 | multiple packages to get that same functionality. |
8df7d2a3 |
604 | |
34153154 |
605 | You can silence these deprecation warnings by installing the modules |
606 | in question from CPAN. To install the latest version of all of them, |
e4717ba1 |
607 | just install C<Task::Deprecations::5_12>. |
34153154 |
608 | |
3ab3a109 |
609 | =over |
610 | |
c66407fa |
611 | =item L<Class::ISA> |
612 | |
613 | =item L<Pod::Plainer> |
614 | |
615 | =item L<Shell> |
3ab3a109 |
616 | |
c66407fa |
617 | =item L<Switch> |
3ab3a109 |
618 | |
b6381718 |
619 | Switch is buggy and should be avoided. You may find Perl's new |
620 | C<given>/C<when> feature a suitable replacement. See L<perlsyn/"Switch |
621 | statements"> for more information. |
3ab3a109 |
622 | |
623 | =back |
624 | |
3ab3a109 |
625 | =item Assignment to $[ |
626 | |
b6381718 |
627 | =item Use of the attribute :locked on subroutines |
3ab3a109 |
628 | |
b6381718 |
629 | =item Use of "locked" with the attributes pragma |
3ab3a109 |
630 | |
b6381718 |
631 | =item Use of "unique" with the attributes pragma |
3ab3a109 |
632 | |
b6381718 |
633 | =item Perl_pmflag |
3ab3a109 |
634 | |
b6381718 |
635 | C<Perl_pmflag> is no longer part of Perl's public API. Calling it now |
636 | generates a deprecation warning, and it will be removed in a future |
637 | release. Although listed as part of the API, it was never documented, |
638 | and only ever used in F<toke.c>, and prior to 5.10, F<regcomp.c>. In |
639 | core, it has been replaced by a static function. |
3ab3a109 |
640 | |
b6381718 |
641 | =item Numerous Perl 4-era libraries |
3ab3a109 |
642 | |
643 | F<termcap.pl>, F<tainted.pl>, F<stat.pl>, F<shellwords.pl>, F<pwd.pl>, |
644 | F<open3.pl>, F<open2.pl>, F<newgetopt.pl>, F<look.pl>, F<find.pl>, |
645 | F<finddepth.pl>, F<importenv.pl>, F<hostname.pl>, F<getopts.pl>, |
646 | F<getopt.pl>, F<getcwd.pl>, F<flush.pl>, F<fastcwd.pl>, F<exceptions.pl>, |
647 | F<ctime.pl>, F<complete.pl>, F<cacheout.pl>, F<bigrat.pl>, F<bigint.pl>, |
648 | F<bigfloat.pl>, F<assert.pl>, F<abbrev.pl>, F<dotsh.pl>, and |
4dfa489a |
649 | F<timelocal.pl> are all now deprecated. Earlier, Perl's developers |
650 | intended to remove these libraries from Perl's core for the 5.14.0 release. |
651 | |
652 | During final testing before the release of 5.12.0, several developers |
653 | discovered current production code using these ancient libraries, some |
654 | inside the Perl core itself. Accordingly, the pumpking granted them |
655 | a stay of execution. They will begin to warn about their deprecation |
656 | in the 5.14.0 release and will be removed in the 5.16.0 release. |
3ab3a109 |
657 | |
b6381718 |
658 | |
3ab3a109 |
659 | =back |
660 | |
b6381718 |
661 | =head1 Unicode overhaul |
3ab3a109 |
662 | |
b6381718 |
663 | Perl's developers have made a concerted effort to update Perl to be in |
664 | sync with the latest Unicode standard. Changes for this include: |
3ab3a109 |
665 | |
b6381718 |
666 | Perl can now handle every Unicode character property. New documentation, |
667 | L<perluniprops>, lists all available non-Unihan character properties. By |
668 | default, perl does not expose Unihan, deprecated or Unicode-internal |
669 | properties. See below for more details on these; there is also a section |
670 | in the pod listing them, and explaining why they are not exposed. |
3ab3a109 |
671 | |
702b4ef6 |
672 | Perl now fully supports the Unicode compound-style of using C<=> |
673 | and C<:> in writing regular expressions: C<\p{property=value}> and |
b6381718 |
674 | C<\p{property:value}> (both of which mean the same thing). |
3ab3a109 |
675 | |
702b4ef6 |
676 | Perl now fully supports the Unicode loose matching rules for text between |
677 | the braces in C<\p{...}> constructs. In addition, Perl allows underscores |
678 | between digits of numbers. |
3ab3a109 |
679 | |
702b4ef6 |
680 | Perl now accepts all the Unicode-defined synonyms for properties and |
681 | property values. |
3ab3a109 |
682 | |
702b4ef6 |
683 | C<qr/\X/>, which matches a Unicode logical character, has |
684 | been expanded to work better with various Asian languages. It |
685 | now is defined as an I<extended grapheme cluster>. (See |
686 | L<http://www.unicode.org/reports/tr29/>). Anything matched previously |
687 | and that made sense will continue to be accepted. Additionally: |
3ab3a109 |
688 | |
b6381718 |
689 | =over |
3ab3a109 |
690 | |
b6381718 |
691 | =item * |
692 | |
693 | C<\X> will not break apart a C<S<CR LF>> sequence. |
3ab3a109 |
694 | |
695 | =item * |
696 | |
702b4ef6 |
697 | C<\X> will now match a sequence which includes the C<ZWJ> and C<ZWNJ> |
698 | characters. |
b6381718 |
699 | |
700 | =item * |
3ab3a109 |
701 | |
702b4ef6 |
702 | C<\X> will now always match at least one character, including an initial |
703 | mark. Marks generally come after a base character, but it is possible in |
704 | Unicode to have them in isolation, and C<\X> will now handle that case, |
705 | for example at the beginning of a line, or after a C<ZWSP>. And this is |
706 | the part where C<\X> doesn't match the things that it used to that don't |
707 | make sense. Formerly, for example, you could have the nonsensical case |
708 | of an accented LF. |
3ab3a109 |
709 | |
710 | =item * |
711 | |
702b4ef6 |
712 | C<\X> will now match a (Korean) Hangul syllable sequence, and the Thai |
713 | and Lao exception cases. |
3ab3a109 |
714 | |
b6381718 |
715 | =back |
3ab3a109 |
716 | |
a56dbb5e |
717 | Otherwise, this change should be transparent for the non-affected |
718 | languages. |
3ab3a109 |
719 | |
b6381718 |
720 | C<\p{...}> matches using the Canonical_Combining_Class property were |
a56dbb5e |
721 | completely broken in previous releases of Perl. They should now work |
722 | correctly. |
723 | |
724 | Before Perl 5.12, the Unicode C<Decomposition_Type=Compat> property |
725 | and a Perl extension had the same name, which led to neither matching |
726 | all the correct values (with more than 100 mistakes in one, and several |
727 | thousand in the other). The Perl extension has now been renamed to be |
728 | C<Decomposition_Type=Noncanonical> (short: C<dt=noncanon>). It has the |
729 | same meaning as was previously intended, namely the union of all the |
730 | non-canonical Decomposition types, with Unicode C<Compat> being just |
731 | one of those. |
3ab3a109 |
732 | |
b6381718 |
733 | C<\p{Decomposition_Type=Canonical}> now includes the Hangul syllables. |
3ab3a109 |
734 | |
a56dbb5e |
735 | C<\p{Uppercase}> and C<\p{Lowercase}> now work as the Unicode standard |
736 | says they should. This means they each match a few more characters than |
737 | they used to. |
3ab3a109 |
738 | |
a56dbb5e |
739 | C<\p{Cntrl}> now matches the same characters as C<\p{Control}>. This |
740 | means it no longer will match Private Use (gc=co), Surrogates (gc=cs), |
741 | nor Format (gc=cf) code points. The Format code points represent the |
742 | biggest possible problem. All but 36 of them are either officially |
743 | deprecated or strongly discouraged from being used. Of those 36, likely |
744 | the most widely used are the soft hyphen (U+00AD), and BOM, ZWSP, ZWNJ, |
745 | WJ, and similar characters, plus bidirectional controls. |
3ab3a109 |
746 | |
a56dbb5e |
747 | C<\p{Alpha}> now matches the same characters as C<\p{Alphabetic}>. Before |
748 | 5.12, Perl's definition definition included a number of things that aren't |
749 | really alpha (all marks) while omitting many that were. The definitions |
750 | of C<\p{Alnum}> and C<\p{Word}> depend on Alpha's definition and have |
751 | changed accordingly. |
3ab3a109 |
752 | |
a56dbb5e |
753 | C<\p{Word}> no longer incorrectly matches non-word characters such |
754 | as fractions. |
3ab3a109 |
755 | |
a56dbb5e |
756 | C<\p{Print}> no longer matches the line control characters: Tab, LF, |
757 | CR, FF, VT, and NEL. This brings it in line with standards and the |
758 | documentation. |
3ab3a109 |
759 | |
b6381718 |
760 | C<\p{XDigit}> now matches the same characters as C<\p{Hex_Digit}>. This |
761 | means that in addition to the characters it currently matches, |
762 | C<[A-Fa-f0-9]>, it will also match the 22 fullwidth equivalents, for |
763 | example U+FF10: FULLWIDTH DIGIT ZERO. |
3ab3a109 |
764 | |
b6381718 |
765 | The Numeric type property has been extended to include the Unihan |
766 | characters. |
3ab3a109 |
767 | |
b6381718 |
768 | There is a new Perl extension, the 'Present_In', or simply 'In', |
769 | property. This is an extension of the Unicode Age property, but |
770 | C<\p{In=5.0}> matches any code point whose usage has been determined |
771 | I<as of> Unicode version 5.0. The C<\p{Age=5.0}> only matches code points |
772 | added in I<precisely> version 5.0. |
3ab3a109 |
773 | |
b6381718 |
774 | A number of properties now have the correct values for unassigned |
a56dbb5e |
775 | code points. The affected properties are Bidi_Class, East_Asian_Width, |
776 | Joining_Type, Decomposition_Type, Hangul_Syllable_Type, Numeric_Type, |
777 | and Line_Break. |
3ab3a109 |
778 | |
b6381718 |
779 | The Default_Ignorable_Code_Point, ID_Continue, and ID_Start properties |
780 | are now up to date with current Unicode definitions. |
3ab3a109 |
781 | |
a56dbb5e |
782 | Earlier versions of Perl erroneously exposed certain properties that |
783 | are supposed to be Unicode internal-only. Use of these in regular |
784 | expressions will now generate, if enabled, a deprecation warning message. |
b6381718 |
785 | The properties are: Other_Alphabetic, Other_Default_Ignorable_Code_Point, |
786 | Other_Grapheme_Extend, Other_ID_Continue, Other_ID_Start, Other_Lowercase, |
787 | Other_Math, and Other_Uppercase. |
3ab3a109 |
788 | |
b6381718 |
789 | It is now possible to change which Unicode properties Perl understands |
790 | on a per-installation basis. As mentioned above, certain properties |
791 | are turned off by default. These include all the Unihan properties |
792 | (which should be accessible via the CPAN module Unicode::Unihan) and any |
793 | deprecated or Unicode internal-only property that Perl has never exposed. |
3ab3a109 |
794 | |
b6381718 |
795 | The generated files in the C<lib/unicore/To> directory are now more |
a56dbb5e |
796 | clearly marked as being stable, directly usable by applications. New hash |
797 | entries in them give the format of the normal entries, which allows for |
798 | easier machine parsing. Perl can generate files in this directory for |
799 | any property, though most are suppressed. You can find instructions |
800 | for changing which are written in L<perluniprops>. |
3ab3a109 |
801 | |
b6381718 |
802 | =head1 Modules and Pragmata |
3ab3a109 |
803 | |
a56dbb5e |
804 | =head2 New Modules and Pragmata |
3ab3a109 |
805 | |
b6381718 |
806 | =over 4 |
3ab3a109 |
807 | |
a56dbb5e |
808 | =item C<autodie> |
3ab3a109 |
809 | |
b6381718 |
810 | C<autodie> is a new lexically-scoped alternative for the C<Fatal> module. |
811 | The bundled version is 2.06_01. Note that in this release, using a string |
812 | eval when C<autodie> is in effect can cause the autodie behaviour to leak |
813 | into the surrounding scope. See L<autodie/"BUGS"> for more details. |
814 | |
a56dbb5e |
815 | Version 2.06_01 has been added to the Perl core. |
3ab3a109 |
816 | |
a56dbb5e |
817 | =item C<Compress::Raw::Bzip2> |
3ab3a109 |
818 | |
a56dbb5e |
819 | Version 2.024 has been added to the Perl core. |
820 | |
821 | =item C<overloading> |
3ab3a109 |
822 | |
b6381718 |
823 | C<overloading> allows you to lexically disable or enable overloading |
79849ba8 |
824 | for some or all operations. |
3ab3a109 |
825 | |
a56dbb5e |
826 | Version 0.001 has been added to the Perl core. |
827 | |
828 | =item C<parent> |
b6381718 |
829 | |
830 | C<parent> establishes an ISA relationship with base classes at compile |
831 | time. It provides the key feature of C<base> without further unwanted |
832 | behaviors. |
3ab3a109 |
833 | |
a56dbb5e |
834 | Version 0.223 has been added to the Perl core. |
835 | |
836 | =item C<Parse::CPAN::Meta> |
3ab3a109 |
837 | |
a56dbb5e |
838 | Version 1.40 has been added to the Perl core. |
839 | |
840 | =item C<VMS::DCLsym> |
841 | |
842 | Version 1.03 has been added to the Perl core. |
843 | |
844 | =item C<VMS::Stdio> |
845 | |
846 | Version 2.4 has been added to the Perl core. |
847 | |
848 | =item C<XS::APItest::KeywordRPN> |
849 | |
850 | Version 0.003 has been added to the Perl core. |
3ab3a109 |
851 | |
b6381718 |
852 | =back |
3ab3a109 |
853 | |
a56dbb5e |
854 | =head2 Updated Pragmata |
3ab3a109 |
855 | |
b6381718 |
856 | =over 4 |
3ab3a109 |
857 | |
a56dbb5e |
858 | =item C<base> |
859 | |
860 | Upgraded from version 2.13 to 2.15. |
861 | |
862 | =item C<bignum> |
863 | |
864 | Upgraded from version 0.22 to 0.23. |
865 | |
866 | =item C<charnames> |
b6381718 |
867 | |
868 | C<charnames> now contains the Unicode F<NameAliases.txt> database file. |
869 | This has the effect of adding some extra C<\N> character names that |
870 | formerly wouldn't have been recognised; for example, C<"\N{LATIN CAPITAL |
871 | LETTER GHA}">. |
3ab3a109 |
872 | |
a56dbb5e |
873 | Upgraded from version 1.06 to 1.07. |
874 | |
875 | =item C<constant> |
876 | |
877 | Upgraded from version 1.13 to 1.20. |
878 | |
879 | =item C<diagnostics> |
880 | |
881 | C<diagnostics> now supports %.0f formatting internally. |
882 | |
883 | C<diagnostics> no longer suppresses C<Use of uninitialized value in range |
884 | (or flip)> warnings. [perl #71204] |
885 | |
886 | Upgraded from version 1.17 to 1.19. |
887 | |
888 | =item C<feature> |
3ab3a109 |
889 | |
702b4ef6 |
890 | In C<feature>, the meaning of the C<:5.10> and C<:5.10.X> feature |
891 | bundles has changed slightly. The last component, if any (i.e. C<X>) is |
892 | simply ignored. This is predicated on the assumption that new features |
893 | will not, in general, be added to maintenance releases. So C<:5.10> |
894 | and C<:5.10.X> have identical effect. This is a change to the behaviour |
895 | documented for 5.10.0. |
3ab3a109 |
896 | |
b6381718 |
897 | C<feature> now includes the C<unicode_strings> feature: |
3ab3a109 |
898 | |
899 | use feature "unicode_strings"; |
900 | |
901 | This pragma turns on Unicode semantics for the case-changing operations |
c66407fa |
902 | (C<uc>, C<lc>, C<ucfirst>, C<lcfirst>) on strings that don't have the |
903 | internal UTF-8 flag set, but that contain single-byte characters between |
904 | 128 and 255. |
3ab3a109 |
905 | |
b7569deb |
906 | Upgraded from version 1.11 to 1.16. |
a56dbb5e |
907 | |
908 | =item C<less> |
909 | |
910 | C<less> now includes the C<stash_name> method to allow subclasses of |
911 | C<less> to pick where in %^H to store their stash. |
912 | |
913 | Upgraded from version 0.02 to 0.03. |
914 | |
915 | =item C<lib> |
916 | |
917 | Upgraded from version 0.5565 to 0.62. |
918 | |
919 | =item C<mro> |
3ab3a109 |
920 | |
702b4ef6 |
921 | C<mro> is now implemented as an XS extension. The documented interface has |
922 | not changed. Code relying on the implementation detail that some C<mro::> |
b6381718 |
923 | methods happened to be available at all times gets to "keep both pieces". |
3ab3a109 |
924 | |
a56dbb5e |
925 | Upgraded from version 1.00 to 1.02. |
3ab3a109 |
926 | |
a56dbb5e |
927 | =item C<overload> |
3ab3a109 |
928 | |
b6381718 |
929 | C<overload> now allow overloading of 'qr'. |
3ab3a109 |
930 | |
a56dbb5e |
931 | Upgraded from version 1.06 to 1.10. |
3ab3a109 |
932 | |
a56dbb5e |
933 | =item C<threads> |
3ab3a109 |
934 | |
a56dbb5e |
935 | Upgraded from version 1.67 to 1.75. |
3ab3a109 |
936 | |
a56dbb5e |
937 | =item C<threads::shared> |
938 | |
939 | Upgraded from version 1.14 to 1.32. |
940 | |
941 | =item C<version> |
3ab3a109 |
942 | |
702b4ef6 |
943 | C<version> now has support for L</Version number formats> as described |
944 | earlier in this document and in its own documentation. |
3ab3a109 |
945 | |
a56dbb5e |
946 | Upgraded from version 0.74 to 0.82. |
947 | |
948 | =item C<warnings> |
949 | |
950 | C<warnings> has a new C<warnings::fatal_enabled()> function. It also |
951 | includes a new C<illegalproto> warning category. See also L</New or |
952 | Changed Diagnostics> for this change. |
3ab3a109 |
953 | |
a56dbb5e |
954 | Upgraded from version 1.06 to 1.09. |
3ab3a109 |
955 | |
956 | =back |
957 | |
a56dbb5e |
958 | =head2 Updated Modules |
959 | |
960 | =over 4 |
961 | |
962 | =item C<Archive::Extract> |
963 | |
964 | Upgraded from version 0.24 to 0.38. |
965 | |
966 | =item C<Archive::Tar> |
967 | |
968 | Upgraded from version 1.38 to 1.54. |
969 | |
970 | =item C<Attribute::Handlers> |
971 | |
972 | Upgraded from version 0.79 to 0.87. |
973 | |
974 | =item C<AutoLoader> |
975 | |
976 | Upgraded from version 5.63 to 5.70. |
977 | |
978 | =item C<B::Concise> |
979 | |
980 | Upgraded from version 0.74 to 0.78. |
981 | |
982 | =item C<B::Debug> |
983 | |
984 | Upgraded from version 1.05 to 1.12. |
985 | |
986 | =item C<B::Deparse> |
987 | |
702b4ef6 |
988 | Upgraded from version 0.83 to 0.96. |
a56dbb5e |
989 | |
990 | =item C<B::Lint> |
991 | |
992 | Upgraded from version 1.09 to 1.11_01. |
993 | |
994 | =item C<CGI> |
995 | |
996 | Upgraded from version 3.29 to 3.48. |
997 | |
998 | =item C<Class::ISA> |
999 | |
1000 | Upgraded from version 0.33 to 0.36. |
1001 | |
702b4ef6 |
1002 | NOTE: C<Class::ISA> is deprecated and may be removed from a future |
1003 | version of Perl. |
a56dbb5e |
1004 | |
1005 | =item C<Compress::Raw::Zlib> |
1006 | |
1007 | Upgraded from version 2.008 to 2.024. |
1008 | |
1009 | =item C<CPAN> |
1010 | |
1011 | Upgraded from version 1.9205 to 1.94_56. |
1012 | |
1013 | =item C<CPANPLUS> |
1014 | |
1015 | Upgraded from version 0.84 to 0.90. |
1016 | |
1017 | =item C<CPANPLUS::Dist::Build> |
1018 | |
1019 | Upgraded from version 0.06_02 to 0.46. |
1020 | |
1021 | =item C<Data::Dumper> |
1022 | |
1023 | Upgraded from version 2.121_14 to 2.125. |
1024 | |
1025 | =item C<DB_File> |
1026 | |
1027 | Upgraded from version 1.816_1 to 1.820. |
1028 | |
1029 | =item C<Devel::PPPort> |
1030 | |
1031 | Upgraded from version 3.13 to 3.19. |
1032 | |
1033 | =item C<Digest> |
1034 | |
1035 | Upgraded from version 1.15 to 1.16. |
1036 | |
1037 | =item C<Digest::MD5> |
1038 | |
1039 | Upgraded from version 2.36_01 to 2.39. |
1040 | |
1041 | =item C<Digest::SHA> |
1042 | |
1043 | Upgraded from version 5.45 to 5.47. |
1044 | |
1045 | =item C<Encode> |
1046 | |
1047 | Upgraded from version 2.23 to 2.39. |
1048 | |
1049 | =item C<Exporter> |
1050 | |
1051 | Upgraded from version 5.62 to 5.64_01. |
1052 | |
1053 | =item C<ExtUtils::CBuilder> |
1054 | |
1055 | Upgraded from version 0.21 to 0.27. |
1056 | |
1057 | =item C<ExtUtils::Command> |
1058 | |
1059 | Upgraded from version 1.13 to 1.16. |
1060 | |
1061 | =item C<ExtUtils::Constant> |
1062 | |
1063 | Upgraded from version 0.2 to 0.22. |
1064 | |
1065 | =item C<ExtUtils::Install> |
1066 | |
1067 | Upgraded from version 1.44 to 1.55. |
1068 | |
1069 | =item C<ExtUtils::MakeMaker> |
1070 | |
1071 | Upgraded from version 6.42 to 6.56. |
1072 | |
1073 | =item C<ExtUtils::Manifest> |
1074 | |
1075 | Upgraded from version 1.51_01 to 1.57. |
1076 | |
1077 | =item C<ExtUtils::ParseXS> |
1078 | |
1079 | Upgraded from version 2.18_02 to 2.21. |
1080 | |
1081 | =item C<File::Fetch> |
1082 | |
1083 | Upgraded from version 0.14 to 0.24. |
1084 | |
1085 | =item C<File::Path> |
1086 | |
1087 | Upgraded from version 2.04 to 2.08_01. |
1088 | |
1089 | =item C<File::Temp> |
1090 | |
1091 | Upgraded from version 0.18 to 0.22. |
1092 | |
1093 | =item C<Filter::Simple> |
1094 | |
1095 | Upgraded from version 0.82 to 0.84. |
1096 | |
1097 | =item C<Filter::Util::Call> |
1098 | |
1099 | Upgraded from version 1.07 to 1.08. |
1100 | |
1101 | =item C<Getopt::Long> |
1102 | |
1103 | Upgraded from version 2.37 to 2.38. |
1104 | |
1105 | =item C<IO> |
1106 | |
1107 | Upgraded from version 1.23_01 to 1.25_02. |
1108 | |
1109 | =item C<IO::Zlib> |
1110 | |
1111 | Upgraded from version 1.07 to 1.10. |
1112 | |
1113 | =item C<IPC::Cmd> |
1114 | |
1115 | Upgraded from version 0.40_1 to 0.54. |
1116 | |
1117 | =item C<IPC::SysV> |
1118 | |
1119 | Upgraded from version 1.05 to 2.01. |
1120 | |
1121 | =item C<Locale::Maketext> |
1122 | |
1123 | Upgraded from version 1.12 to 1.14. |
1124 | |
1125 | =item C<Locale::Maketext::Simple> |
1126 | |
1127 | Upgraded from version 0.18 to 0.21. |
1128 | |
1129 | =item C<Log::Message> |
1130 | |
1131 | Upgraded from version 0.01 to 0.02. |
1132 | |
1133 | =item C<Log::Message::Simple> |
1134 | |
1135 | Upgraded from version 0.04 to 0.06. |
1136 | |
1137 | =item C<Math::BigInt> |
1138 | |
1139 | Upgraded from version 1.88 to 1.89_01. |
1140 | |
1141 | =item C<Math::BigInt::FastCalc> |
1142 | |
1143 | Upgraded from version 0.16 to 0.19. |
1144 | |
1145 | =item C<Math::BigRat> |
1146 | |
1147 | Upgraded from version 0.21 to 0.24. |
1148 | |
1149 | =item C<Math::Complex> |
1150 | |
1151 | Upgraded from version 1.37 to 1.56. |
1152 | |
1153 | =item C<Memoize> |
1154 | |
1155 | Upgraded from version 1.01_02 to 1.01_03. |
1156 | |
1157 | =item C<MIME::Base64> |
1158 | |
1159 | Upgraded from version 3.07_01 to 3.08. |
1160 | |
1161 | =item C<Module::Build> |
1162 | |
1163 | Upgraded from version 0.2808_01 to 0.3603. |
1164 | |
1165 | =item C<Module::CoreList> |
1166 | |
702b4ef6 |
1167 | Upgraded from version 2.12 to 2.29. |
a56dbb5e |
1168 | |
1169 | =item C<Module::Load> |
1170 | |
1171 | Upgraded from version 0.12 to 0.16. |
1172 | |
1173 | =item C<Module::Load::Conditional> |
1174 | |
1175 | Upgraded from version 0.22 to 0.34. |
1176 | |
1177 | =item C<Module::Loaded> |
1178 | |
1179 | Upgraded from version 0.01 to 0.06. |
1180 | |
1181 | =item C<Module::Pluggable> |
1182 | |
1183 | Upgraded from version 3.6 to 3.9. |
1184 | |
1185 | =item C<Net::Ping> |
1186 | |
1187 | Upgraded from version 2.33 to 2.36. |
1188 | |
1189 | =item C<NEXT> |
1190 | |
1191 | Upgraded from version 0.60_01 to 0.64. |
1192 | |
1193 | =item C<Object::Accessor> |
1194 | |
1195 | Upgraded from version 0.32 to 0.36. |
1196 | |
1197 | =item C<Package::Constants> |
1198 | |
1199 | Upgraded from version 0.01 to 0.02. |
1200 | |
1201 | =item C<PerlIO> |
1202 | |
1203 | Upgraded from version 1.04 to 1.06. |
1204 | |
1205 | =item C<Pod::Parser> |
1206 | |
1207 | Upgraded from version 1.35 to 1.37. |
1208 | |
1209 | =item C<Pod::Perldoc> |
1210 | |
1211 | Upgraded from version 3.14_02 to 3.15_02. |
1212 | |
1213 | =item C<Pod::Plainer> |
1214 | |
1215 | Upgraded from version 0.01 to 1.02. |
1216 | |
702b4ef6 |
1217 | NOTE: C<Pod::Plainer> is deprecated and may be removed from a future |
1218 | version of Perl. |
a56dbb5e |
1219 | |
1220 | =item C<Pod::Simple> |
1221 | |
1222 | Upgraded from version 3.05 to 3.13. |
1223 | |
1224 | =item C<Safe> |
1225 | |
1226 | Upgraded from version 2.12 to 2.22. |
1227 | |
1228 | =item C<SelfLoader> |
1229 | |
1230 | Upgraded from version 1.11 to 1.17. |
1231 | |
1232 | =item C<Storable> |
1233 | |
1234 | Upgraded from version 2.18 to 2.22. |
1235 | |
1236 | =item C<Switch> |
1237 | |
1238 | Upgraded from version 2.13 to 2.16. |
1239 | |
702b4ef6 |
1240 | NOTE: C<Switch> is deprecated and may be removed from a future version |
1241 | of Perl. |
a56dbb5e |
1242 | |
1243 | =item C<Sys::Syslog> |
1244 | |
1245 | Upgraded from version 0.22 to 0.27. |
1246 | |
1247 | =item C<Term::ANSIColor> |
1248 | |
1249 | Upgraded from version 1.12 to 2.02. |
1250 | |
1251 | =item C<Term::UI> |
1252 | |
1253 | Upgraded from version 0.18 to 0.20. |
1254 | |
1255 | =item C<Test> |
1256 | |
1257 | Upgraded from version 1.25 to 1.25_02. |
1258 | |
1259 | =item C<Test::Harness> |
1260 | |
1261 | Upgraded from version 2.64 to 3.17. |
1262 | |
1263 | =item C<Test::Simple> |
1264 | |
1265 | Upgraded from version 0.72 to 0.94. |
1266 | |
1267 | =item C<Text::Balanced> |
1268 | |
1269 | Upgraded from version 2.0.0 to 2.02. |
1270 | |
1271 | =item C<Text::ParseWords> |
1272 | |
1273 | Upgraded from version 3.26 to 3.27. |
1274 | |
1275 | =item C<Text::Soundex> |
1276 | |
1277 | Upgraded from version 3.03 to 3.03_01. |
1278 | |
1279 | =item C<Thread::Queue> |
1280 | |
1281 | Upgraded from version 2.00 to 2.11. |
1282 | |
1283 | =item C<Thread::Semaphore> |
1284 | |
1285 | Upgraded from version 2.01 to 2.09. |
1286 | |
1287 | =item C<Tie::RefHash> |
1288 | |
1289 | Upgraded from version 1.37 to 1.38. |
1290 | |
1291 | =item C<Time::HiRes> |
1292 | |
1293 | Upgraded from version 1.9711 to 1.9719. |
1294 | |
1295 | =item C<Time::Local> |
1296 | |
1297 | Upgraded from version 1.18 to 1.1901_01. |
1298 | |
1299 | =item C<Time::Piece> |
1300 | |
1301 | Upgraded from version 1.12 to 1.15. |
1302 | |
1303 | =item C<Unicode::Collate> |
1304 | |
1305 | Upgraded from version 0.52 to 0.52_01. |
1306 | |
1307 | =item C<Unicode::Normalize> |
1308 | |
1309 | Upgraded from version 1.02 to 1.03. |
1310 | |
1311 | =item C<Win32> |
1312 | |
1313 | Upgraded from version 0.34 to 0.39. |
1314 | |
1315 | =item C<Win32API::File> |
1316 | |
1317 | Upgraded from version 0.1001_01 to 0.1101. |
1318 | |
1319 | =item C<XSLoader> |
1320 | |
1321 | Upgraded from version 0.08 to 0.10. |
1322 | |
1323 | =back |
3ab3a109 |
1324 | |
b6381718 |
1325 | =head2 Removed Modules and Pragmata |
3ab3a109 |
1326 | |
1327 | =over 4 |
1328 | |
a56dbb5e |
1329 | =item C<attrs> |
3ab3a109 |
1330 | |
a56dbb5e |
1331 | Removed from the Perl core. Prior version was 1.02. |
3ab3a109 |
1332 | |
a56dbb5e |
1333 | =item C<CPAN::API::HOWTO> |
3ab3a109 |
1334 | |
a56dbb5e |
1335 | Removed from the Perl core. Prior version was 'undef'. |
1336 | |
1337 | =item C<CPAN::DeferedCode> |
1338 | |
1339 | Removed from the Perl core. Prior version was 5.50. |
1340 | |
1341 | =item C<CPANPLUS::inc> |
1342 | |
1343 | Removed from the Perl core. Prior version was 'undef'. |
1344 | |
1345 | =item C<DCLsym> |
1346 | |
1347 | Removed from the Perl core. Prior version was 1.03. |
1348 | |
1349 | =item C<ExtUtils::MakeMaker::bytes> |
1350 | |
1351 | Removed from the Perl core. Prior version was 6.42. |
1352 | |
1353 | =item C<ExtUtils::MakeMaker::vmsish> |
1354 | |
1355 | Removed from the Perl core. Prior version was 6.42. |
3ab3a109 |
1356 | |
a56dbb5e |
1357 | =item C<Stdio> |
1358 | |
1359 | Removed from the Perl core. Prior version was 2.3. |
1360 | |
1361 | =item C<Test::Harness::Assert> |
1362 | |
1363 | Removed from the Perl core. Prior version was 0.02. |
1364 | |
1365 | =item C<Test::Harness::Iterator> |
1366 | |
1367 | Removed from the Perl core. Prior version was 0.02. |
1368 | |
1369 | =item C<Test::Harness::Point> |
1370 | |
1371 | Removed from the Perl core. Prior version was 0.01. |
1372 | |
1373 | =item C<Test::Harness::Results> |
1374 | |
1375 | Removed from the Perl core. Prior version was 0.01. |
1376 | |
1377 | =item C<Test::Harness::Straps> |
1378 | |
1379 | Removed from the Perl core. Prior version was 0.26_01. |
1380 | |
1381 | =item C<Test::Harness::Util> |
1382 | |
1383 | Removed from the Perl core. Prior version was 0.01. |
1384 | |
1385 | =item C<XSSymSet> |
1386 | |
1387 | Removed from the Perl core. Prior version was 1.1. |
3ab3a109 |
1388 | |
1389 | =back |
1390 | |
b6381718 |
1391 | =head2 Deprecated Modules and Pragmata |
1392 | |
1393 | See L</Deprecated Modules> above. |
1394 | |
a56dbb5e |
1395 | |
3ab3a109 |
1396 | =head1 Documentation |
1397 | |
1398 | =head2 New Documentation |
1399 | |
1400 | =over 4 |
1401 | |
1402 | =item * |
1403 | |
702b4ef6 |
1404 | L<perlhaiku> contains instructions on how to build perl for the Haiku |
1405 | platform. |
3ab3a109 |
1406 | |
1407 | =item * |
1408 | |
702b4ef6 |
1409 | L<perlmroapi> describes the new interface for pluggable Method Resolution |
1410 | Orders. |
3ab3a109 |
1411 | |
1412 | =item * |
1413 | |
b6381718 |
1414 | L<perlperf>, by Richard Foley, provides an introduction to the use of |
3ab3a109 |
1415 | performance and optimization techniques which can be used with particular |
1416 | reference to perl programs. |
1417 | |
1418 | =item * |
1419 | |
702b4ef6 |
1420 | L<perlrepository> describes how to access the perl source using the I<git> |
1421 | version control system. |
3ab3a109 |
1422 | |
1423 | =item * |
1424 | |
1425 | L<perlpolicy> extends the "Social contract about contributed modules" into |
1426 | the beginnings of a document on Perl porting policies. |
1427 | |
1428 | =back |
1429 | |
1430 | =head2 Changes to Existing Documentation |
1431 | |
b6381718 |
1432 | |
72d4e865 |
1433 | =over |
1434 | |
1435 | |
1436 | =item * |
1437 | |
702b4ef6 |
1438 | The various large F<Changes*> files (which listed every change made |
1439 | to perl over the last 18 years) have been removed, and replaced by a |
1440 | small file, also called F<Changes>, which just explains how that same |
1441 | information may be extracted from the git version control system. |
3ab3a109 |
1442 | |
72d4e865 |
1443 | =item * |
1444 | |
b6381718 |
1445 | F<Porting/patching.pod> has been deleted, as it mainly described |
3ab3a109 |
1446 | interacting with the old Perforce-based repository, which is now obsolete. |
1447 | Information still relevant has been moved to L<perlrepository>. |
1448 | |
3ab3a109 |
1449 | |
72d4e865 |
1450 | =item * |
1451 | |
702b4ef6 |
1452 | The syntax C<unless (EXPR) BLOCK else BLOCK> is now documented as valid, |
1453 | as is the syntax C<unless (EXPR) BLOCK elsif (EXPR) BLOCK ... else |
1454 | BLOCK>, although actually using the latter may not be the best idea for |
1455 | the readability of your source code. |
72d4e865 |
1456 | |
3ab3a109 |
1457 | |
1458 | =item * |
1459 | |
1460 | Documented -X overloading. |
1461 | |
1462 | =item * |
1463 | |
1464 | Documented that C<when()> treats specially most of the filetest operators |
1465 | |
1466 | =item * |
1467 | |
b6381718 |
1468 | Documented C<when> as a syntax modifier. |
3ab3a109 |
1469 | |
1470 | =item * |
1471 | |
c66407fa |
1472 | Eliminated "Old Perl threads tutorial", which described 5005 threads. |
3ab3a109 |
1473 | |
1474 | F<pod/perlthrtut.pod> is the same material reworked for ithreads. |
1475 | |
1476 | =item * |
1477 | |
1478 | Correct previous documentation: v-strings are not deprecated |
1479 | |
72d4e865 |
1480 | With version objects, we need them to use MODULE VERSION syntax. This |
c66407fa |
1481 | patch removes the deprecation notice. |
3ab3a109 |
1482 | |
1483 | =item * |
1484 | |
b6381718 |
1485 | Security contact information is now part of L<perlsec>. |
1486 | |
1487 | =item * |
3ab3a109 |
1488 | |
702b4ef6 |
1489 | A significant fraction of the core documentation has been updated to |
1490 | clarify the behavior of Perl's Unicode handling. |
3ab3a109 |
1491 | |
1492 | Much of the remaining core documentation has been reviewed and edited |
1493 | for clarity, consistent use of language, and to fix the spelling of Tom |
1494 | Christiansen's name. |
1495 | |
b6381718 |
1496 | =item * |
1497 | |
3ab3a109 |
1498 | The Pod specification (L<perlpodspec>) has been updated to bring the |
c66407fa |
1499 | specification in line with modern usage already supported by most Pod |
72d4e865 |
1500 | systems. A parameter string may now follow the format name in a |
1501 | "begin/end" region. Links to URIs with a text description are now |
1502 | allowed. The usage of C<LE<lt>"section"E<gt>> has been marked as |
c66407fa |
1503 | deprecated. |
3ab3a109 |
1504 | |
b6381718 |
1505 | =item * |
1506 | |
3ab3a109 |
1507 | L<if.pm|if> has been documented in L<perlfunc/use> as a means to get |
c66407fa |
1508 | conditional loading of modules despite the implicit BEGIN block around |
1509 | C<use>. |
3ab3a109 |
1510 | |
1511 | =item * |
1512 | |
c66407fa |
1513 | The documentation for C<$1> in perlvar.pod has been clarified. |
3ab3a109 |
1514 | |
a620a577 |
1515 | =item * |
1516 | |
1517 | C<\N{U+I<wide hex char>}> is now documented. |
1518 | |
3ab3a109 |
1519 | =back |
1520 | |
b6381718 |
1521 | =head1 Selected Performance Enhancements |
3ab3a109 |
1522 | |
1523 | =over 4 |
1524 | |
1525 | =item * |
1526 | |
1527 | A new internal cache means that C<isa()> will often be faster. |
1528 | |
1529 | =item * |
1530 | |
702b4ef6 |
1531 | The implementation of C<C3> Method Resolution Order has been |
1532 | optimised - linearisation for classes with single inheritance is 40% |
1533 | faster. Performance for multiple inheritance is unchanged. |
3ab3a109 |
1534 | |
1535 | =item * |
1536 | |
1537 | Under C<use locale>, the locale-relevant information is now cached on |
1538 | read-only values, such as the list returned by C<keys %hash>. This makes |
702b4ef6 |
1539 | operations such as C<sort keys %hash> in the scope of C<use locale> |
1540 | much faster. |
3ab3a109 |
1541 | |
1542 | =item * |
1543 | |
1544 | Empty C<DESTROY> methods are no longer called. |
1545 | |
1546 | =item * |
1547 | |
b6381718 |
1548 | C<Perl_sv_utf8_upgrade()> is now faster. |
3ab3a109 |
1549 | |
1550 | =item * |
1551 | |
b6381718 |
1552 | C<keys> on empty hash is now faster. |
3ab3a109 |
1553 | |
1554 | =item * |
1555 | |
b6381718 |
1556 | C<if (%foo)> has been optimized to be faster than C<if (keys %foo)>. |
3ab3a109 |
1557 | |
1558 | =item * |
1559 | |
702b4ef6 |
1560 | The string repetition operator (C<$str x $num>) is now several times |
1561 | faster when C<$str> has length one or C<$num> is large. |
8a4f3f14 |
1562 | |
1563 | =item * |
1564 | |
3ab3a109 |
1565 | Reversing an array to itself (as in C<@a = reverse @a>) in void context |
702b4ef6 |
1566 | now happens in-place and is several orders of magnitude faster than |
1567 | it used to be. It will also preserve non-existent elements whenever |
1568 | possible, i.e. for non magical arrays or tied arrays with C<EXISTS> |
1569 | and C<DELETE> methods. |
3ab3a109 |
1570 | |
1571 | =back |
1572 | |
1573 | =head1 Installation and Configuration Improvements |
1574 | |
72d4e865 |
1575 | =over 4 |
1576 | |
1577 | =item * |
1578 | |
1579 | L<perlapi>, L<perlintern>, L<perlmodlib> and L<perltoc> are now all |
1580 | generated at build time, rather than being shipped as part of the release. |
1581 | |
1582 | =item * |
3ab3a109 |
1583 | |
702b4ef6 |
1584 | If C<vendorlib> and C<vendorarch> are the same, then they are only added |
1585 | to C<@INC> once. |
3ab3a109 |
1586 | |
72d4e865 |
1587 | =item * |
1588 | |
3ab3a109 |
1589 | C<$Config{usedevel}> and the C-level C<PERL_USE_DEVEL> are now defined if |
1590 | perl is built with C<-Dusedevel>. |
1591 | |
72d4e865 |
1592 | =item * |
1593 | |
3ab3a109 |
1594 | F<Configure> will enable use of C<-fstack-protector>, to provide protection |
1595 | against stack-smashing attacks, if the compiler supports it. |
1596 | |
72d4e865 |
1597 | =item * |
1598 | |
3ab3a109 |
1599 | F<Configure> will now determine the correct prototypes for re-entrant |
c66407fa |
1600 | functions and for C<gconvert> if you are using a C++ compiler rather |
3ab3a109 |
1601 | than a C compiler. |
1602 | |
72d4e865 |
1603 | =item * |
1604 | |
3ab3a109 |
1605 | On Unix, if you build from a tree containing a git repository, the |
1606 | configuration process will note the commit hash you have checked out, for |
1607 | display in the output of C<perl -v> and C<perl -V>. Unpushed local commits |
1608 | are automatically added to the list of local patches displayed by |
1609 | C<perl -V>. |
1610 | |
72d4e865 |
1611 | =item * |
1612 | |
b6381718 |
1613 | Perl now supports SystemTap's C<dtrace> compatibility layer and an |
72d4e865 |
1614 | issue with linking C<miniperl> has been fixed in the process. |
1615 | |
1616 | =item * |
1617 | |
b6381718 |
1618 | perldoc now uses C<less -R> instead of C<less> for improved behaviour |
1619 | in the face of C<groff>'s new usage of ANSI escape codes. |
72d4e865 |
1620 | |
1621 | =item * |
1622 | |
72d4e865 |
1623 | |
b6381718 |
1624 | C<perl -V> now reports use of the compile-time options C<USE_PERL_ATOF> and |
1625 | C<USE_ATTRIBUTES_FOR_PERLIO>. |
72d4e865 |
1626 | |
b6381718 |
1627 | =item * |
3ab3a109 |
1628 | |
1629 | As part of the flattening of F<ext>, all extensions on all platforms are |
1630 | built by F<make_ext.pl>. This replaces the Unix-specific |
1631 | F<ext/util/make_ext>, VMS-specific F<make_ext.com> and Win32-specific |
1632 | F<win32/buildext.pl>. |
1633 | |
b6381718 |
1634 | =back |
3ab3a109 |
1635 | |
b6381718 |
1636 | =head1 Internal Changes |
1637 | |
1638 | Each release of Perl sees numerous internal changes which shouldn't |
1639 | affect day to day usage but may still be notable for developers working |
1640 | with Perl's source code. |
1641 | |
1642 | =over |
3ab3a109 |
1643 | |
1644 | =item * |
1645 | |
702b4ef6 |
1646 | The J.R.R. Tolkien quotes at the head of C source file have been checked |
1647 | and proper citations added, thanks to a patch from Tom Christiansen. |
3ab3a109 |
1648 | |
1649 | =item * |
1650 | |
b6381718 |
1651 | The internal structure of the dual-life modules traditionally found in |
e706c0cd |
1652 | the F<lib/> and F<ext/> directories in the perl source has changed |
b6381718 |
1653 | significantly. Where possible, dual-lifed modules have been extracted |
1654 | from F<lib/> and F<ext/>. |
1655 | |
1656 | Dual-lifed modules maintained by Perl's developers as part of the Perl |
1657 | core now live in F<dist/>. Dual-lifed modules maintained primarily on |
1658 | CPAN now live in F<cpan/>. When reporting a bug in a module located |
1659 | under F<cpan/>, please send your bug report directly to the module's |
1660 | bug tracker or author, rather than Perl's bug tracker. |
3ab3a109 |
1661 | |
1662 | =item * |
1663 | |
b6381718 |
1664 | C<\N{...}> now compiles better, always forces UTF-8 internal representation |
1665 | |
702b4ef6 |
1666 | Perl's developers have fixed several problems with the recognition of |
1667 | C<\N{...}> constructs. As part of this, perl will store any scalar |
1668 | or regex containing C<\N{I<name>}> or C<\N{U+I<wide hex char>}> in its |
1669 | definition in UTF-8 format. (This was true previously for all occurences |
1670 | of C<\N{I<name>}> that did not use a custom translator, but now it's |
1671 | always true.) |
3ab3a109 |
1672 | |
1673 | =item * |
1674 | |
b6381718 |
1675 | Perl_magic_setmglob now knows about globs, fixing RT #71254. |
3ab3a109 |
1676 | |
1677 | =item * |
1678 | |
b6381718 |
1679 | C<SVt_RV> no longer exists. RVs are now stored in IVs. |
3ab3a109 |
1680 | |
1681 | =item * |
1682 | |
702b4ef6 |
1683 | C<Perl_vcroak()> now accepts a null first argument. In addition, a full |
1684 | audit was made of the "not NULL" compiler annotations, and those for |
1685 | several other internal functions were corrected. |
3ab3a109 |
1686 | |
1687 | =item * |
1688 | |
1689 | New macros C<dSAVEDERRNO>, C<dSAVE_ERRNO>, C<SAVE_ERRNO>, C<RESTORE_ERRNO> |
1690 | have been added to formalise the temporary saving of the C<errno> |
1691 | variable. |
1692 | |
1693 | =item * |
1694 | |
1695 | The function C<Perl_sv_insert_flags> has been added to augment |
1696 | C<Perl_sv_insert>. |
1697 | |
1698 | =item * |
1699 | |
1700 | The function C<Perl_newSV_type(type)> has been added, equivalent to |
1701 | C<Perl_newSV()> followed by C<Perl_sv_upgrade(type)>. |
1702 | |
1703 | =item * |
1704 | |
1705 | The function C<Perl_newSVpvn_flags()> has been added, equivalent to |
1706 | C<Perl_newSVpvn()> and then performing the action relevant to the flag. |
1707 | |
1708 | Two flag bits are currently supported. |
1709 | |
1710 | =over 4 |
1711 | |
1712 | =item * |
1713 | |
702b4ef6 |
1714 | C<SVf_UTF8> will call C<SvUTF8_on()> for you. (Note that this does |
1715 | not convert an sequence of ISO 8859-1 characters to UTF-8). A wrapper, |
1716 | C<newSVpvn_utf8()> is available for this. |
3ab3a109 |
1717 | |
1718 | =item * |
1719 | |
b6381718 |
1720 | C<SVs_TEMP> now calls C<Perl_sv_2mortal()> on the new SV. |
3ab3a109 |
1721 | |
1722 | =back |
1723 | |
1724 | There is also a wrapper that takes constant strings, C<newSVpvs_flags()>. |
1725 | |
1726 | =item * |
1727 | |
1728 | The function C<Perl_croak_xs_usage> has been added as a wrapper to |
1729 | C<Perl_croak>. |
1730 | |
1731 | =item * |
1732 | |
b6381718 |
1733 | Perl now exports the functions C<PerlIO_find_layer> and C<PerlIO_list_alloc>. |
3ab3a109 |
1734 | |
1735 | =item * |
1736 | |
702b4ef6 |
1737 | C<PL_na> has been exterminated from the core code, replaced by local |
1738 | STRLEN temporaries, or C<*_nolen()> calls. Either approach is faster than |
1739 | C<PL_na>, which is a pointer dereference into the interpreter structure |
1740 | under ithreads, and a global variable otherwise. |
3ab3a109 |
1741 | |
1742 | =item * |
1743 | |
702b4ef6 |
1744 | C<Perl_mg_free()> used to leave freed memory accessible via C<SvMAGIC()> |
1745 | on the scalar. It now updates the linked list to remove each piece of |
1746 | magic as it is freed. |
3ab3a109 |
1747 | |
1748 | =item * |
1749 | |
702b4ef6 |
1750 | Under ithreads, the regex in C<PL_reg_curpm> is now reference |
1751 | counted. This eliminates a lot of hackish workarounds to cope with it |
1752 | not being reference counted. |
3ab3a109 |
1753 | |
1754 | =item * |
1755 | |
1756 | C<Perl_mg_magical()> would sometimes incorrectly turn on C<SvRMAGICAL()>. |
1757 | This has been fixed. |
1758 | |
1759 | =item * |
1760 | |
1761 | The I<public> IV and NV flags are now not set if the string value has |
1762 | trailing "garbage". This behaviour is consistent with not setting the |
1763 | public IV or NV flags if the value is out of range for the type. |
1764 | |
1765 | =item * |
1766 | |
702b4ef6 |
1767 | Uses of C<Nullav>, C<Nullcv>, C<Nullhv>, C<Nullop>, C<Nullsv> etc have |
1768 | been replaced by C<NULL> in the core code, and non-dual-life modules, |
1769 | as C<NULL> is clearer to those unfamiliar with the core code. |
3ab3a109 |
1770 | |
1771 | =item * |
1772 | |
1773 | A macro C<MUTABLE_PTR(p)> has been added, which on (non-pedantic) gcc will |
1774 | not cast away C<const>, returning a C<void *>. Macros C<MUTABLE_SV(av)>, |
1775 | C<MUTABLE_SV(cv)> etc build on this, casting to C<AV *> etc without |
1776 | casting away C<const>. This allows proper compile-time auditing of |
702b4ef6 |
1777 | C<const> correctness in the core, and helped picked up some errors |
1778 | (now fixed). |
3ab3a109 |
1779 | |
1780 | =item * |
1781 | |
1782 | Macros C<mPUSHs()> and C<mXPUSHs()> have been added, for pushing SVs on the |
1783 | stack and mortalizing them. |
1784 | |
1785 | =item * |
1786 | |
1787 | Use of the private structure C<mro_meta> has changed slightly. Nothing |
1788 | outside the core should be accessing this directly anyway. |
1789 | |
b6381718 |
1790 | =item * |
1791 | |
1792 | A new tool, F<Porting/expand-macro.pl> has been added, that allows you |
1793 | to view how a C preprocessor macro would be expanded when compiled. |
1794 | This is handy when trying to decode the macro hell that is the perl |
1795 | guts. |
1796 | |
1797 | =back |
1798 | |
1799 | =head1 Testing |
1800 | |
1801 | =head2 Testing improvements |
1802 | |
1803 | =over 4 |
1804 | |
1805 | =item Parallel tests |
1806 | |
1807 | The core distribution can now run its regression tests in parallel on |
1808 | Unix-like platforms. Instead of running C<make test>, set C<TEST_JOBS> in |
1809 | your environment to the number of tests to run in parallel, and run |
1810 | C<make test_harness>. On a Bourne-like shell, this can be done as |
1811 | |
1812 | TEST_JOBS=3 make test_harness # Run 3 tests in parallel |
3ab3a109 |
1813 | |
b6381718 |
1814 | An environment variable is used, rather than parallel make itself, because |
1815 | L<TAP::Harness> needs to be able to schedule individual non-conflicting test |
1816 | scripts itself, and there is no standard interface to C<make> utilities to |
1817 | interact with their job schedulers. |
3ab3a109 |
1818 | |
b6381718 |
1819 | Note that currently some test scripts may fail when run in parallel (most |
1820 | notably C<ext/IO/t/io_dir.t>). If necessary run just the failing scripts |
1821 | again sequentially and see if the failures go away. |
3ab3a109 |
1822 | |
b6381718 |
1823 | =item Test harness flexibility |
3ab3a109 |
1824 | |
b6381718 |
1825 | It's now possible to override C<PERL5OPT> and friends in F<t/TEST> |
1826 | |
1827 | =item Test watchdog |
3ab3a109 |
1828 | |
3ab3a109 |
1829 | Several tests that have the potential to hang forever if they fail now |
1830 | incorporate a "watchdog" functionality that will kill them after a timeout, |
1831 | which helps ensure that C<make test> and C<make test_harness> run to |
79849ba8 |
1832 | completion automatically. |
3ab3a109 |
1833 | |
b6381718 |
1834 | |
1835 | =back |
1836 | |
1837 | =head2 New Tests |
1838 | |
1839 | Perl's developers have added a number of new tests to the core. |
1840 | In addition to the items listed below, many modules updated from CPAN |
1841 | incorporate new tests. |
3ab3a109 |
1842 | |
1843 | =over 4 |
1844 | |
1845 | =item * |
1846 | |
1847 | Significant cleanups to core tests to ensure that language and |
1848 | interpreter features are not used before they're tested. |
1849 | |
1850 | =item * |
1851 | |
c66407fa |
1852 | C<make test_porting> now runs a number of important pre-commit checks |
1853 | which might be of use to anyone working on the Perl core. |
3ab3a109 |
1854 | |
1855 | =item * |
1856 | |
1857 | F<t/porting/podcheck.t> automatically checks the well-formedness of |
1858 | POD found in all .pl, .pm and .pod files in the F<MANIFEST>, other than in |
1859 | dual-lifed modules which are primarily maintained outside the Perl core. |
1860 | |
1861 | =item * |
1862 | |
702b4ef6 |
1863 | F<t/porting/manifest.t> now tests that all files listed in MANIFEST |
1864 | are present. |
3ab3a109 |
1865 | |
1866 | =item * |
1867 | |
b6381718 |
1868 | F<t/op/while_readdir.t> tests that a bare readdir in while loop sets $_. |
3ab3a109 |
1869 | |
1870 | =item * |
1871 | |
702b4ef6 |
1872 | F<t/comp/retainedlines.t> checks that the debugger can retain source |
1873 | lines from C<eval>. |
3ab3a109 |
1874 | |
1875 | =item * |
1876 | |
b6381718 |
1877 | F<t/io/perlio_fail.t> checks that bad layers fail. |
3ab3a109 |
1878 | |
1879 | =item * |
1880 | |
b6381718 |
1881 | F<t/io/perlio_leaks.t> checks that PerlIO layers are not leaking. |
3ab3a109 |
1882 | |
1883 | =item * |
1884 | |
b6381718 |
1885 | F<t/io/perlio_open.t> checks that certain special forms of open work. |
3ab3a109 |
1886 | |
1887 | =item * |
1888 | |
b6381718 |
1889 | F<t/io/perlio.t> includes general PerlIO tests. |
3ab3a109 |
1890 | |
1891 | =item * |
1892 | |
702b4ef6 |
1893 | F<t/io/pvbm.t> checks that there is no unexpected interaction between |
1894 | the internal types C<PVBM> and C<PVGV>. |
3ab3a109 |
1895 | |
1896 | =item * |
1897 | |
702b4ef6 |
1898 | F<t/mro/package_aliases.t> checks that mro works properly in the presence |
1899 | of aliased packages. |
3ab3a109 |
1900 | |
1901 | =item * |
1902 | |
b6381718 |
1903 | F<t/op/dbm.t> tests C<dbmopen> and C<dbmclose>. |
3ab3a109 |
1904 | |
1905 | =item * |
1906 | |
b6381718 |
1907 | F<t/op/index_thr.t> tests the interaction of C<index> and threads. |
3ab3a109 |
1908 | |
1909 | =item * |
1910 | |
b6381718 |
1911 | F<t/op/pat_thr.t> tests the interaction of esoteric patterns and threads. |
3ab3a109 |
1912 | |
1913 | =item * |
1914 | |
b6381718 |
1915 | F<t/op/qr_gc.t> tests that C<qr> doesn't leak. |
3ab3a109 |
1916 | |
1917 | =item * |
1918 | |
b6381718 |
1919 | F<t/op/reg_email_thr.t> tests the interaction of regex recursion and threads. |
3ab3a109 |
1920 | |
1921 | =item * |
1922 | |
702b4ef6 |
1923 | F<t/op/regexp_qr_embed_thr.t> tests the interaction of patterns with |
1924 | embedded C<qr//> and threads. |
3ab3a109 |
1925 | |
1926 | =item * |
1927 | |
702b4ef6 |
1928 | F<t/op/regexp_unicode_prop.t> tests Unicode properties in regular |
1929 | expressions. |
3ab3a109 |
1930 | |
1931 | =item * |
1932 | |
702b4ef6 |
1933 | F<t/op/regexp_unicode_prop_thr.t> tests the interaction of Unicode |
1934 | properties and threads. |
3ab3a109 |
1935 | |
1936 | =item * |
1937 | |
b6381718 |
1938 | F<t/op/reg_nc_tie.t> tests the tied methods of C<Tie::Hash::NamedCapture>. |
3ab3a109 |
1939 | |
1940 | =item * |
1941 | |
702b4ef6 |
1942 | F<t/op/reg_posixcc.t> checks that POSIX character classes behave |
1943 | consistently. |
3ab3a109 |
1944 | |
1945 | =item * |
1946 | |
0c359e6f |
1947 | F<t/op/re.t> checks that exportable C<re> functions in F<universal.c> work. |
3ab3a109 |
1948 | |
1949 | =item * |
1950 | |
b6381718 |
1951 | F<t/op/setpgrpstack.t> checks that C<setpgrp> works. |
3ab3a109 |
1952 | |
1953 | =item * |
1954 | |
b6381718 |
1955 | F<t/op/substr_thr.t> tests the interaction of C<substr> and threads. |
3ab3a109 |
1956 | |
1957 | =item * |
1958 | |
b6381718 |
1959 | F<t/op/upgrade.t> checks that upgrading and assigning scalars works. |
3ab3a109 |
1960 | |
1961 | =item * |
1962 | |
b6381718 |
1963 | F<t/uni/lex_utf8.t> checks that Unicode in the lexer works. |
3ab3a109 |
1964 | |
1965 | =item * |
1966 | |
b6381718 |
1967 | F<t/uni/tie.t> checks that Unicode and C<tie> work. |
3ab3a109 |
1968 | |
1969 | =item * |
1970 | |
b6381718 |
1971 | F<t/comp/final_line_num.t> tests whether line numbers are correct at EOF |
3ab3a109 |
1972 | |
1973 | =item * |
1974 | |
b6381718 |
1975 | F<t/comp/form_scope.t> tests format scoping. |
3ab3a109 |
1976 | |
1977 | =item * |
1978 | |
b6381718 |
1979 | F<t/comp/line_debug.t> tests whether C<< @{"_<$file"} >> works. |
3ab3a109 |
1980 | |
1981 | =item * |
1982 | |
b6381718 |
1983 | F<t/op/filetest_t.t> tests if -t file test works. |
3ab3a109 |
1984 | |
1985 | =item * |
1986 | |
b6381718 |
1987 | F<t/op/qr.t> tests C<qr>. |
3ab3a109 |
1988 | |
1989 | =item * |
1990 | |
b6381718 |
1991 | F<t/op/utf8cache.t> tests malfunctions of the utf8 cache. |
3ab3a109 |
1992 | |
1993 | =item * |
1994 | |
b6381718 |
1995 | F<t/re/uniprops.t> test unicodes C<\p{}> regex constructs. |
3ab3a109 |
1996 | |
b16f1257 |
1997 | =item * |
1998 | |
b6381718 |
1999 | F<t/op/filehandle.t> tests some suitably portable filetest operators |
2000 | to check that they work as expected, particularly in the light of some |
2001 | internal changes made in how filehandles are blessed. |
72d4e865 |
2002 | |
b16f1257 |
2003 | =item * |
2004 | |
b6381718 |
2005 | F<t/op/time_loop.t> tests that unix times greater than C<2**63>, which |
2006 | can now be handed to C<gmtime> and C<localtime>, do not cause an internal |
2007 | overflow or an excessively long loop. |
72d4e865 |
2008 | |
3ab3a109 |
2009 | =back |
2010 | |
3ab3a109 |
2011 | |
b6381718 |
2012 | =head1 New or Changed Diagnostics |
72d4e865 |
2013 | |
b6381718 |
2014 | =head2 New Diagnostics |
72d4e865 |
2015 | |
b6381718 |
2016 | =over |
72d4e865 |
2017 | |
b6381718 |
2018 | =item * |
72d4e865 |
2019 | |
b6381718 |
2020 | SV allocation tracing has been added to the diagnostics enabled by C<-Dm>. |
2021 | The tracing can alternatively output via the C<PERL_MEM_LOG> mechanism, if |
2022 | that was enabled when the F<perl> binary was compiled. |
72d4e865 |
2023 | |
b6381718 |
2024 | =item * |
3ab3a109 |
2025 | |
702b4ef6 |
2026 | Smartmatch resolution tracing has been added as a new diagnostic. Use |
2027 | C<-DM> to enable it. |
3ab3a109 |
2028 | |
b6381718 |
2029 | =item * |
3ab3a109 |
2030 | |
b6381718 |
2031 | A new debugging flag C<-DB> now dumps subroutine definitions, leaving |
2032 | C<-Dx> for its original purpose of dumping syntax trees. |
3ab3a109 |
2033 | |
b6381718 |
2034 | =item * |
3ab3a109 |
2035 | |
b6381718 |
2036 | Perl 5.12 provides a number of new diagnostic messages to help you write |
2037 | better code. See L<perldiag> for details of these new messages. |
3ab3a109 |
2038 | |
2039 | =over 4 |
2040 | |
2041 | =item * |
2042 | |
2043 | C<Bad plugin affecting keyword '%s'> |
2044 | |
2045 | =item * |
2046 | |
2047 | C<gmtime(%.0f) too large> |
2048 | |
2049 | =item * |
2050 | |
2051 | C<Lexing code attempted to stuff non-Latin-1 character into Latin-1 input> |
2052 | |
2053 | =item * |
2054 | |
2055 | C<Lexing code internal error (%s)> |
2056 | |
2057 | =item * |
2058 | |
2059 | C<localtime(%.0f) too large> |
2060 | |
2061 | =item * |
2062 | |
2063 | C<Overloaded dereference did not return a reference> |
2064 | |
2065 | =item * |
2066 | |
2067 | C<Overloaded qr did not return a REGEXP> |
2068 | |
2069 | =item * |
2070 | |
2071 | C<Perl_pmflag() is deprecated, and will be removed from the XS API> |
2072 | |
2073 | =item * |
2074 | |
b6381718 |
2075 | C<lvalue attribute ignored after the subroutine has been defined> |
3ab3a109 |
2076 | |
2077 | This new warning is issued when one attempts to mark a subroutine as |
2078 | lvalue after it has been defined. |
2079 | |
2080 | =item * |
2081 | |
702b4ef6 |
2082 | Perl now warns you if C<++> or C<--> are unable to change the value |
2083 | because it's beyond the limit of representation. |
3ab3a109 |
2084 | |
2085 | This uses a new warnings category: "imprecision". |
2086 | |
208f012a |
2087 | =item * |
c66407fa |
2088 | |
2089 | C<lc>, C<uc>, C<lcfirst>, and C<ucfirst> warn when passed undef. |
3ab3a109 |
2090 | |
2091 | =item * |
2092 | |
b6381718 |
2093 | C<Show constant in "Useless use of a constant in void context"> |
3ab3a109 |
2094 | |
2095 | =item * |
2096 | |
b6381718 |
2097 | C<Prototype after '%s'> |
3ab3a109 |
2098 | |
2099 | =item * |
2100 | |
b6381718 |
2101 | C<panic: sv_chop %s> |
2102 | |
2103 | This new fatal error occurs when the C routine C<Perl_sv_chop()> was |
2104 | passed a position that is not within the scalar's string buffer. This |
2105 | could be caused by buggy XS code, and at this point recovery is not |
2106 | possible. |
2107 | |
3ab3a109 |
2108 | |
2109 | =item * |
2110 | |
b6381718 |
2111 | The fatal error C<Malformed UTF-8 returned by \N> is now produced if the |
2112 | C<charnames> handler returns malformed UTF-8. |
3ab3a109 |
2113 | |
2114 | =item * |
2115 | |
702b4ef6 |
2116 | If an unresolved named character or sequence was encountered when |
2117 | compiling a regex pattern then the fatal error C<\N{NAME} must be resolved |
2118 | by the lexer> is now produced. This can happen, for example, when using a |
2119 | single-quotish context like C<$re = '\N{SPACE}'; /$re/;>. See L<perldiag> |
2120 | for more examples of how the lexer can get bypassed. |
3ab3a109 |
2121 | |
2122 | =item * |
2123 | |
702b4ef6 |
2124 | C<Invalid hexadecimal number in \N{U+...}> is a new fatal error |
2125 | triggered when the character constant represented by C<...> is not a |
2126 | valid hexadecimal number. |
3ab3a109 |
2127 | |
2128 | =item * |
2129 | |
b6381718 |
2130 | The new meaning of C<\N> as C<[^\n]> is not valid in a bracketed character |
702b4ef6 |
2131 | class, just like C<.> in a character class loses its special meaning, |
2132 | and will cause the fatal error C<\N in a character class must be a named |
2133 | character: \N{...}>. |
b6381718 |
2134 | |
2135 | =item * |
3ab3a109 |
2136 | |
702b4ef6 |
2137 | The rules on what is legal for the C<...> in C<\N{...}> have been |
2138 | tightened up so that unless the C<...> begins with an alphabetic |
2139 | character and continues with a combination of alphanumerics, dashes, |
2140 | spaces, parentheses or colons then the warning C<Deprecated character(s) |
2141 | in \N{...} starting at '%s'> is now issued. |
3ab3a109 |
2142 | |
2143 | =item * |
2144 | |
702b4ef6 |
2145 | The warning C<Using just the first characters returned by \N{}> will |
2146 | be issued if the C<charnames> handler returns a sequence of characters |
2147 | which exceeds the limit of the number of characters that can be used. The |
2148 | message will indicate which characters were used and which were discarded. |
3ab3a109 |
2149 | |
b6381718 |
2150 | =back |
3ab3a109 |
2151 | |
b6381718 |
2152 | =back |
3ab3a109 |
2153 | |
b6381718 |
2154 | =head2 Changed Diagnostics |
3ab3a109 |
2155 | |
b6381718 |
2156 | A number of existing diagnostic messages have been improved or corrected: |
3ab3a109 |
2157 | |
b6381718 |
2158 | =over |
3ab3a109 |
2159 | |
2160 | =item * |
2161 | |
b6381718 |
2162 | A new warning category C<illegalproto> allows finer-grained control of |
2163 | warnings around function prototypes. |
3ab3a109 |
2164 | |
b6381718 |
2165 | The two warnings: |
3ab3a109 |
2166 | |
b6381718 |
2167 | =over |
3ab3a109 |
2168 | |
b6381718 |
2169 | =item C<Illegal character in prototype for %s : %s> |
2170 | |
2171 | =item C<Prototype after '%c' for %s : %s> |
2172 | |
2173 | =back |
2174 | |
2175 | have been moved from the C<syntax> top-level warnings category into a new |
702b4ef6 |
2176 | first-level category, C<illegalproto>. These two warnings are currently |
2177 | the only ones emitted during parsing of an invalid/illegal prototype, |
2178 | so one can now use |
b6381718 |
2179 | |
2180 | no warnings 'illegalproto'; |
2181 | |
702b4ef6 |
2182 | to suppress only those, but not other syntax-related warnings. Warnings |
2183 | where prototypes are changed, ignored, or not met are still in the |
2184 | C<prototype> category as before. |
3ab3a109 |
2185 | |
2186 | =item * |
2187 | |
3ab3a109 |
2188 | C<Deep recursion on subroutine "%s"> |
2189 | |
2190 | It is now possible to change the depth threshold for this warning from the |
2191 | default of 100, by recompiling the F<perl> binary, setting the C |
2192 | pre-processor macro C<PERL_SUB_DEPTH_WARN> to the desired value. |
2193 | |
2194 | =item * |
2195 | |
b6381718 |
2196 | C<Illegal character in prototype> warning is now more precise |
2197 | when reporting illegal characters after _ |
3ab3a109 |
2198 | |
2199 | =item * |
2200 | |
702b4ef6 |
2201 | mro merging error messages are now very similar to those produced by |
2202 | L<Algorithm::C3>. |
3ab3a109 |
2203 | |
2204 | =item * |
2205 | |
b6381718 |
2206 | Amelioration of the error message "Unrecognized character %s in column %d" |
2207 | |
2208 | Changes the error message to "Unrecognized character %s; marked by E<lt>-- |
2209 | HERE after %sE<lt>-- HERE near column %d". This should make it a little |
2210 | simpler to spot and correct the suspicious character. |
3ab3a109 |
2211 | |
2212 | =item * |
2213 | |
702b4ef6 |
2214 | Perl now explicitly points to C<$.> when it causes an uninitialized |
2215 | warning for ranges in scalar context. |
3ab3a109 |
2216 | |
2217 | =item * |
2218 | |
b6381718 |
2219 | C<split> now warns when called in void context. |
3ab3a109 |
2220 | |
2221 | =item * |
2222 | |
b6381718 |
2223 | C<printf>-style functions called with too few arguments will now issue the |
2224 | warning C<"Missing argument in %s"> [perl #71000] |
3ab3a109 |
2225 | |
2226 | =item * |
2227 | |
b6381718 |
2228 | Perl now properly returns a syntax error instead of segfaulting |
2229 | if C<each>, C<keys>, or C<values> is used without an argument. |
3ab3a109 |
2230 | |
2231 | =item * |
2232 | |
b6381718 |
2233 | C<tell()> now fails properly if called without an argument and when no |
2234 | previous file was read. |
3ab3a109 |
2235 | |
b6381718 |
2236 | C<tell()> now returns C<-1>, and sets errno to C<EBADF>, thus restoring |
2237 | the 5.8.x behaviour. |
3ab3a109 |
2238 | |
2239 | =item * |
2240 | |
b6381718 |
2241 | C<overload> no longer implicitly unsets fallback on repeated 'use |
2242 | overload' lines. |
3ab3a109 |
2243 | |
72d4e865 |
2244 | =item * |
2245 | |
b6381718 |
2246 | POSIX::strftime() can now handle Unicode characters in the format string. |
72d4e865 |
2247 | |
2248 | =item * |
2249 | |
b6381718 |
2250 | The C<syntax> category was removed from 5 warnings that should only be in |
2251 | C<deprecated>. |
72d4e865 |
2252 | |
2253 | =item * |
2254 | |
b6381718 |
2255 | Three fatal C<pack>/C<unpack> error messages have been normalized to |
2256 | C<panic: %s> |
72d4e865 |
2257 | |
2258 | =item * |
2259 | |
b6381718 |
2260 | C<Unicode character is illegal> has been rephrased to be more accurate |
2261 | |
2262 | It now reads C<Unicode non-character is illegal in interchange> and the |
2263 | perldiag documentation has been expanded a bit. |
72d4e865 |
2264 | |
2265 | =item * |
2266 | |
702b4ef6 |
2267 | Currently, all but the first of the several characters that the |
2268 | C<charnames> handler may return are discarded when used in a regular |
2269 | expression pattern bracketed character class. If this happens then the |
2270 | warning C<Using just the first character returned by \N{} in character |
2271 | class> will be issued. |
72d4e865 |
2272 | |
2273 | =item * |
2274 | |
702b4ef6 |
2275 | The warning C<Missing right brace on \N{} or unescaped left brace after |
2276 | \N. Assuming the latter> will be issued if Perl encounters a C<\N{> |
2277 | but doesn't find a matching C<}>. In this case Perl doesn't know if it |
2278 | was mistakenly omitted, or if "match non-newline" followed by "match |
2279 | a C<{>" was desired. It assumes the latter because that is actually a |
2280 | valid interpretation as written, unlike the other case. If you meant |
2281 | the former, you need to add the matching right brace. If you did mean |
2282 | the latter, you can silence this warning by writing instead C<\N\{>. |
72d4e865 |
2283 | |
2284 | =item * |
2285 | |
702b4ef6 |
2286 | C<gmtime> and C<localtime> called with numbers smaller than they can |
2287 | reliably handle will now issue the warnings C<gmtime(%.0f) too small> |
2288 | and C<localtime(%.0f) too small>. |
72d4e865 |
2289 | |
2290 | =back |
3ab3a109 |
2291 | |
b6381718 |
2292 | The following diagnostic messages have been removed: |
c66407fa |
2293 | |
2294 | =over 4 |
2295 | |
2296 | =item * |
2297 | |
2298 | C<Runaway format> |
2299 | |
2300 | =item * |
2301 | |
2302 | C<Can't locate package %s for the parents of %s> |
2303 | |
b6381718 |
2304 | In general this warning it only got produced in |
c66407fa |
2305 | conjunction with other warnings, and removing it allowed an ISA lookup |
2306 | optimisation to be added. |
2307 | |
2308 | =item * |
2309 | |
2310 | C<v-string in use/require is non-portable> |
2311 | |
2312 | =back |
2313 | |
3ab3a109 |
2314 | =head1 Utility Changes |
2315 | |
2316 | =over 4 |
2317 | |
2318 | =item * |
2319 | |
702b4ef6 |
2320 | F<h2ph> now looks in C<include-fixed> too, which is a recent addition |
2321 | to gcc's search path. |
3ab3a109 |
2322 | |
2323 | =item * |
2324 | |
79849ba8 |
2325 | F<h2xs> no longer incorrectly treats enum values like macros. |
208f012a |
2326 | It also now handles C++ style comments (C<//>) properly in enums. |
3ab3a109 |
2327 | |
2328 | =item * |
2329 | |
d13f8571 |
2330 | F<perl5db.pl> now supports C<LVALUE> subroutines. Additionally, the |
2331 | debugger now correctly handles proxy constant subroutines, and |
2332 | subroutine stubs. |
3ab3a109 |
2333 | |
2334 | =item * |
2335 | |
b6381718 |
2336 | F<perlbug> now uses C<%Module::CoreList::bug_tracker> to print out |
2337 | upstream bug tracker URLs. If a user identifies a particular module |
4655b0a1 |
2338 | as the topic of their bug report and we're able to divine the URL for |
b6381718 |
2339 | its upstream bug tracker, perlbug now provide a message to the user |
2340 | explaining that the core copies the CPAN version directly, and provide |
2341 | the URL for reporting the bug directly to the upstream author. |
3ab3a109 |
2342 | |
702b4ef6 |
2343 | F<perlbug> no longer reports "Message sent" when it hasn't actually sent |
2344 | the message |
3ab3a109 |
2345 | |
2346 | =item * |
2347 | |
b6381718 |
2348 | F<perlthanks> is a new utility for sending non-bug-reports to the |
2349 | authors and maintainers of Perl. Getting nothing but bug reports can |
2350 | become a bit demoralising. If Perl 5.12 works well for you, please try |
2351 | out F<perlthanks>. It will make the developers smile. |
3ab3a109 |
2352 | |
2353 | =item * |
2354 | |
b6381718 |
2355 | Perl's developers have fixed bugs in F<a2p> having to do with the |
e014eb68 |
2356 | C<match()> operator in list context. Additionally, F<a2p> no longer |
2357 | generates code that uses the C<$[> variable. |
3ab3a109 |
2358 | |
2359 | =back |
2360 | |
2361 | =head1 Selected Bug Fixes |
2362 | |
2363 | =over 4 |
2364 | |
2365 | =item * |
2366 | |
b6381718 |
2367 | U+0FFFF is now a legal character in regular expressions. |
2368 | |
2369 | =item * |
2370 | |
2371 | pp_qr now always returns a new regexp SV. Resolves RT #69852. |
3ab3a109 |
2372 | |
702b4ef6 |
2373 | Instead of returning a(nother) reference to the (pre-compiled) regexp |
2374 | in the optree, use reg_temp_copy() to create a copy of it, and return a |
2375 | reference to that. This resolves issues about Regexp::DESTROY not being |
2376 | called in a timely fashion (the original bug tracked by RT #69852), as |
2377 | well as bugs related to blessing regexps, and of assigning to regexps, |
2378 | as described in correspondence added to the ticket. |
3ab3a109 |
2379 | |
2380 | It transpires that we also need to undo the SvPVX() sharing when ithreads |
702b4ef6 |
2381 | cloning a Regexp SV, because mother_re is set to NULL, instead of a |
2382 | cloned copy of the mother_re. This change might fix bugs with regexps |
2383 | and threads in certain other situations, but as yet neither tests nor |
2384 | bug reports have indicated any problems, so it might not actually be an |
2385 | edge case that it's possible to reach. |
3ab3a109 |
2386 | |
2387 | =item * |
2388 | |
702b4ef6 |
2389 | Several compilation errors and segfaults when perl was built with C<-Dmad> |
2390 | were fixed. |
3ab3a109 |
2391 | |
2392 | =item * |
2393 | |
2394 | Fixes for lexer API changes in 5.11.2 which broke NYTProf's savesrc option. |
2395 | |
2396 | =item * |
2397 | |
c66407fa |
2398 | C<-t> should only return TRUE for file handles connected to a TTY |
3ab3a109 |
2399 | |
702b4ef6 |
2400 | The Microsoft C version of C<isatty()> returns TRUE for all character mode |
2401 | devices, including the F</dev/null>-style "nul" device and printers like |
2402 | "lpt1". |
3ab3a109 |
2403 | |
2404 | =item * |
2405 | |
2406 | Fixed a regression caused by commit fafafbaf which caused a panic during |
2407 | parameter passing [perl #70171] |
2408 | |
2409 | =item * |
2410 | |
2411 | On systems which in-place edits without backup files, -i'*' now works as |
2412 | the documentation says it does [perl #70802] |
2413 | |
2414 | =item * |
2415 | |
2416 | Saving and restoring magic flags no longer loses readonly flag. |
2417 | |
2418 | =item * |
2419 | |
2420 | The malformed syntax C<grep EXPR LIST> (note the missing comma) no longer |
2421 | causes abrupt and total failure. |
2422 | |
2423 | =item * |
2424 | |
2425 | Regular expressions compiled with C<qr{}> literals properly set C<$'> when |
2426 | matching again. |
2427 | |
2428 | =item * |
2429 | |
702b4ef6 |
2430 | Using named subroutines with C<sort> should no longer lead to bus errors |
2431 | [perl #71076] |
3ab3a109 |
2432 | |
2433 | =item * |
2434 | |
2435 | Numerous bugfixes catch small issues caused by the recently-added Lexer API. |
2436 | |
2437 | =item * |
2438 | |
2439 | Smart match against C<@_> sometimes gave false negatives. [perl #71078] |
2440 | |
2441 | =item * |
2442 | |
c66407fa |
2443 | C<$@> may now be assigned a read-only value (without error or busting |
2444 | the stack). |
3ab3a109 |
2445 | |
2446 | =item * |
2447 | |
2448 | C<sort> called recursively from within an active comparison subroutine no |
2449 | longer causes a bus error if run multiple times. [perl #71076] |
2450 | |
2451 | =item * |
2452 | |
c66407fa |
2453 | Tie::Hash::NamedCapture::* will not abort if passed bad input (RT #71828) |
3ab3a109 |
2454 | |
2455 | =item * |
2456 | |
2457 | @_ and $_ no longer leak under threads (RT #34342 and #41138, also |
2458 | #70602, #70974) |
2459 | |
2460 | =item * |
2461 | |
2462 | C<-I> on shebang line now adds directories in front of @INC |
2463 | as documented, and as does C<-I> when specified on the command-line. |
2464 | |
2465 | =item * |
2466 | |
2467 | C<kill> is now fatal when called on non-numeric process identifiers. |
c66407fa |
2468 | Previously, an C<undef> process identifier would be interpreted as a |
2469 | request to kill process 0, which would terminate the current process |
72d4e865 |
2470 | group on POSIX systems. Since process identifiers are always integers, |
c66407fa |
2471 | killing a non-numeric process is now fatal. |
3ab3a109 |
2472 | |
2473 | =item * |
2474 | |
2475 | 5.10.0 inadvertently disabled an optimisation, which caused a measurable |
2476 | performance drop in list assignment, such as is often used to assign |
2477 | function parameters from C<@_>. The optimisation has been re-instated, and |
72d4e865 |
2478 | the performance regression fixed. (This fix is also present in 5.10.1) |
3ab3a109 |
2479 | |
2480 | =item * |
2481 | |
2482 | Fixed memory leak on C<while (1) { map 1, 1 }> [RT #53038]. |
2483 | |
2484 | =item * |
2485 | |
2486 | Some potential coredumps in PerlIO fixed [RT #57322,54828]. |
2487 | |
2488 | =item * |
2489 | |
2490 | The debugger now works with lvalue subroutines. |
2491 | |
2492 | =item * |
2493 | |
2494 | The debugger's C<m> command was broken on modules that defined constants |
2495 | [RT #61222]. |
2496 | |
2497 | =item * |
2498 | |
2499 | C<crypt> and string complement could return tainted values for untainted |
2500 | arguments [RT #59998]. |
2501 | |
2502 | =item * |
2503 | |
2504 | The C<-i>I<.suffix> command-line switch now recreates the file using |
2505 | restricted permissions, before changing its mode to match the original |
2506 | file. This eliminates a potential race condition [RT #60904]. |
2507 | |
2508 | =item * |
2509 | |
2510 | On some Unix systems, the value in C<$?> would not have the top bit set |
2511 | (C<$? & 128>) even if the child core dumped. |
2512 | |
2513 | =item * |
2514 | |
2515 | Under some circumstances, C<$^R> could incorrectly become undefined |
2516 | [RT #57042]. |
2517 | |
2518 | =item * |
2519 | |
2520 | In the XS API, various hash functions, when passed a pre-computed hash where |
2521 | the key is UTF-8, might result in an incorrect lookup. |
2522 | |
2523 | =item * |
2524 | |
2525 | XS code including F<XSUB.h> before F<perl.h> gave a compile-time error |
2526 | [RT #57176]. |
2527 | |
2528 | =item * |
2529 | |
702b4ef6 |
2530 | C<< $object-E<gt>isa('Foo') >> would report false if the package C<Foo> |
2531 | didn't exist, even if the object's C<@ISA> contained C<Foo>. |
3ab3a109 |
2532 | |
2533 | =item * |
2534 | |
2535 | Various bugs in the new-to 5.10.0 mro code, triggered by manipulating |
2536 | C<@ISA>, have been found and fixed. |
2537 | |
2538 | =item * |
2539 | |
2540 | Bitwise operations on references could crash the interpreter, e.g. |
2541 | C<$x=\$y; $x |= "foo"> [RT #54956]. |
2542 | |
2543 | =item * |
2544 | |
2545 | Patterns including alternation might be sensitive to the internal UTF-8 |
2546 | representation, e.g. |
2547 | |
2548 | my $byte = chr(192); |
2549 | my $utf8 = chr(192); utf8::upgrade($utf8); |
2550 | $utf8 =~ /$byte|X}/i; # failed in 5.10.0 |
2551 | |
2552 | =item * |
2553 | |
2554 | Within UTF8-encoded Perl source files (i.e. where C<use utf8> is in |
2555 | effect), double-quoted literal strings could be corrupted where a C<\xNN>, |
2556 | C<\0NNN> or C<\N{}> is followed by a literal character with ordinal value |
2557 | greater than 255 [RT #59908]. |
2558 | |
2559 | =item * |
2560 | |
2561 | C<B::Deparse> failed to correctly deparse various constructs: |
2562 | C<readpipe STRING> [RT #62428], C<CORE::require(STRING)> [RT #62488], |
2563 | C<sub foo(_)> [RT #62484]. |
2564 | |
2565 | =item * |
2566 | |
2567 | Using C<setpgrp> with no arguments could corrupt the perl stack. |
2568 | |
2569 | =item * |
2570 | |
2571 | The block form of C<eval> is now specifically trappable by C<Safe> and |
72d4e865 |
2572 | C<ops>. Previously it was erroneously treated like string C<eval>. |
3ab3a109 |
2573 | |
2574 | =item * |
2575 | |
2576 | In 5.10.0, the two characters C<[~> were sometimes parsed as the smart |
2577 | match operator (C<~~>) [RT #63854]. |
2578 | |
2579 | =item * |
2580 | |
2581 | In 5.10.0, the C<*> quantifier in patterns was sometimes treated as |
2582 | C<{0,32767}> [RT #60034, #60464]. For example, this match would fail: |
2583 | |
2584 | ("ab" x 32768) =~ /^(ab)*$/ |
2585 | |
2586 | =item * |
2587 | |
2588 | C<shmget> was limited to a 32 bit segment size on a 64 bit OS [RT #63924]. |
2589 | |
2590 | =item * |
2591 | |
2592 | Using C<next> or C<last> to exit a C<given> block no longer produces a |
2593 | spurious warning like the following: |
2594 | |
2595 | Exiting given via last at foo.pl line 123 |
2596 | |
2597 | =item * |
2598 | |
3ab3a109 |
2599 | Assigning a format to a glob could corrupt the format; e.g.: |
2600 | |
2601 | *bar=*foo{FORMAT}; # foo format now bad |
2602 | |
2603 | =item * |
2604 | |
2605 | Attempting to coerce a typeglob to a string or number could cause an |
2606 | assertion failure. The correct error message is now generated, |
2607 | C<Can't coerce GLOB to I<$type>>. |
2608 | |
2609 | =item * |
2610 | |
702b4ef6 |
2611 | Under C<use filetest 'access'>, C<-x> was using the wrong access |
2612 | mode. This has been fixed [RT #49003]. |
3ab3a109 |
2613 | |
2614 | =item * |
2615 | |
2616 | C<length> on a tied scalar that returned a Unicode value would not be |
2617 | correct the first time. This has been fixed. |
2618 | |
2619 | =item * |
2620 | |
2621 | Using an array C<tie> inside in array C<tie> could SEGV. This has been |
2622 | fixed. [RT #51636] |
2623 | |
2624 | =item * |
2625 | |
2626 | A race condition inside C<PerlIOStdio_close()> has been identified and |
2627 | fixed. This used to cause various threading issues, including SEGVs. |
2628 | |
2629 | =item * |
2630 | |
2631 | In C<unpack>, the use of C<()> groups in scalar context was internally |
2632 | placing a list on the interpreter's stack, which manifested in various |
72d4e865 |
2633 | ways, including SEGVs. This is now fixed [RT #50256]. |
3ab3a109 |
2634 | |
2635 | =item * |
2636 | |
2637 | Magic was called twice in C<substr>, C<\&$x>, C<tie $x, $m> and C<chop>. |
2638 | These have all been fixed. |
2639 | |
2640 | =item * |
2641 | |
2642 | A 5.10.0 optimisation to clear the temporary stack within the implicit |
2643 | loop of C<s///ge> has been reverted, as it turned out to be the cause of |
2644 | obscure bugs in seemingly unrelated parts of the interpreter [commit |
2645 | ef0d4e17921ee3de]. |
2646 | |
2647 | =item * |
2648 | |
2649 | The line numbers for warnings inside C<elsif> are now correct. |
2650 | |
2651 | =item * |
2652 | |
2653 | The C<..> operator now works correctly with ranges whose ends are at or |
2654 | close to the values of the smallest and largest integers. |
2655 | |
2656 | =item * |
2657 | |
2658 | C<binmode STDIN, ':raw'> could lead to segmentation faults on some platforms. |
2659 | This has been fixed [RT #54828]. |
2660 | |
2661 | =item * |
2662 | |
2663 | An off-by-one error meant that C<index $str, ...> was effectively being |
2664 | executed as C<index "$str\0", ...>. This has been fixed [RT #53746]. |
2665 | |
2666 | =item * |
2667 | |
2668 | Various leaks associated with named captures in regexes have been fixed |
2669 | [RT #57024]. |
2670 | |
2671 | =item * |
2672 | |
2673 | A weak reference to a hash would leak. This was affecting C<DBI> |
2674 | [RT #56908]. |
2675 | |
2676 | =item * |
2677 | |
2678 | Using (?|) in a regex could cause a segfault [RT #59734]. |
2679 | |
2680 | =item * |
2681 | |
2682 | Use of a UTF-8 C<tr//> within a closure could cause a segfault [RT #61520]. |
2683 | |
2684 | =item * |
2685 | |
2686 | Calling C<Perl_sv_chop()> or otherwise upgrading an SV could result in an |
2687 | unaligned 64-bit access on the SPARC architecture [RT #60574]. |
2688 | |
2689 | =item * |
2690 | |
2691 | In the 5.10.0 release, C<inc_version_list> would incorrectly list |
2692 | C<5.10.*> after C<5.8.*>; this affected the C<@INC> search order |
2693 | [RT #67628]. |
2694 | |
2695 | =item * |
2696 | |
2697 | In 5.10.0, C<pack "a*", $tainted_value> returned a non-tainted value |
2698 | [RT #52552]. |
2699 | |
2700 | =item * |
2701 | |
2702 | In 5.10.0, C<printf> and C<sprintf> could produce the fatal error |
2703 | C<panic: utf8_mg_pos_cache_update> when printing UTF-8 strings |
2704 | [RT #62666]. |
2705 | |
2706 | =item * |
2707 | |
2708 | In the 5.10.0 release, a dynamically created C<AUTOLOAD> method might be |
2709 | missed (method cache issue) [RT #60220,60232]. |
2710 | |
2711 | =item * |
2712 | |
2713 | In the 5.10.0 release, a combination of C<use feature> and C<//ee> could |
2714 | cause a memory leak [RT #63110]. |
2715 | |
2716 | =item * |
2717 | |
2718 | C<-C> on the shebang (C<#!>) line is once more permitted if it is also |
2719 | specified on the command line. C<-C> on the shebang line used to be a |
2720 | silent no-op I<if> it was not also on the command line, so perl 5.10.0 |
2721 | disallowed it, which broke some scripts. Now perl checks whether it is |
2722 | also on the command line and only dies if it is not [RT #67880]. |
2723 | |
2724 | =item * |
2725 | |
2726 | In 5.10.0, certain types of re-entrant regular expression could crash, |
2727 | or cause the following assertion failure [RT #60508]: |
2728 | |
2729 | Assertion rx->sublen >= (s - rx->subbeg) + i failed |
2730 | |
2731 | =item * |
2732 | |
702b4ef6 |
2733 | Perl now includes previously missing files from the Unicode Character |
2734 | Database. |
3ab3a109 |
2735 | |
2736 | =item * |
2737 | |
b6381718 |
2738 | Perl now honors C<TMPDIR> when opening an anonymous temporary file. |
3ab3a109 |
2739 | |
2740 | =back |
2741 | |
b6381718 |
2742 | |
3ab3a109 |
2743 | =head1 Platform Specific Changes |
2744 | |
b6381718 |
2745 | Perl is incredibly portable. In general, if a platform has a C compiler, |
2746 | someone has ported Perl to it (or will soon). We're happy to announce |
2747 | that Perl 5.12 includes support for several new platforms. At the same |
2748 | time, it's time to bid farewell to some (very) old friends. |
2749 | |
3ab3a109 |
2750 | =head2 New Platforms |
2751 | |
2752 | =over |
2753 | |
2754 | =item Haiku |
2755 | |
702b4ef6 |
2756 | Perl's developers have merged patches from Haiku's maintainers. Perl |
2757 | should now build on Haiku. |
3ab3a109 |
2758 | |
2759 | =item MirOS BSD |
2760 | |
2761 | Perl should now build on MirOS BSD. |
2762 | |
3ab3a109 |
2763 | =back |
2764 | |
2765 | =head2 Discontinued Platforms |
2766 | |
2767 | =over |
2768 | |
3b72faae |
2769 | =item Domain/OS |
3ab3a109 |
2770 | |
3ab3a109 |
2771 | =item MiNT |
2772 | |
8ead3603 |
2773 | =item Tenon MachTen |
2774 | |
3ab3a109 |
2775 | =back |
2776 | |
2777 | =head2 Updated Platforms |
2778 | |
2779 | =over 4 |
2780 | |
8ead3603 |
2781 | =item AIX |
2782 | |
2783 | =over 4 |
2784 | |
2785 | =item * |
2786 | |
702b4ef6 |
2787 | Removed F<libbsd> for AIX 5L and 6.1. Only C<flock()> was used from |
2788 | F<libbsd>. |
8ead3603 |
2789 | |
2790 | =item * |
2791 | |
702b4ef6 |
2792 | Removed F<libgdbm> for AIX 5L and 6.1 if F<libgdbm> < 1.8.3-5 is |
2793 | installed. The F<libgdbm> is delivered as an optional package with the |
2794 | AIX Toolbox. Unfortunately the versions below 1.8.3-5 are broken. |
8ead3603 |
2795 | |
2796 | =item * |
2797 | |
2798 | Hints changes mean that AIX 4.2 should work again. |
2799 | |
2800 | =back |
2801 | |
2802 | =item Cygwin |
2803 | |
2804 | =over 4 |
2805 | |
2806 | =item * |
2807 | |
2808 | Perl now supports IPv6 on Cygwin 1.7 and newer. |
2809 | |
2810 | =item * |
2811 | |
2812 | On Cygwin we now strip the last number from the DLL. This has been the |
2813 | behaviour in the cygwin.com build for years. The hints files have been |
2814 | updated. |
2815 | |
2816 | =back |
2817 | |
3ab3a109 |
2818 | =item Darwin (Mac OS X) |
2819 | |
2820 | =over 4 |
2821 | |
2822 | =item * |
2823 | |
2824 | Skip testing the be_BY.CP1131 locale on Darwin 10 (Mac OS X 10.6), |
2825 | as it's still buggy. |
2826 | |
2827 | =item * |
2828 | |
2829 | Correct infelicities in the regexp used to identify buggy locales |
2830 | on Darwin 8 and 9 (Mac OS X 10.4 and 10.5, respectively). |
2831 | |
2832 | =back |
2833 | |
2834 | =item DragonFly BSD |
2835 | |
2836 | =over 4 |
2837 | |
2838 | =item * |
2839 | |
2840 | Fix thread library selection [perl #69686] |
2841 | |
2842 | =back |
2843 | |
8ead3603 |
2844 | =item FreeBSD |
3ab3a109 |
2845 | |
2846 | =over 4 |
2847 | |
2848 | =item * |
2849 | |
8ead3603 |
2850 | The hints files now identify the correct threading libraries on FreeBSD 7 |
2851 | and later. |
3ab3a109 |
2852 | |
8ead3603 |
2853 | =back |
3ab3a109 |
2854 | |
8ead3603 |
2855 | =item Irix |
3ab3a109 |
2856 | |
8ead3603 |
2857 | =over 4 |
3ab3a109 |
2858 | |
2859 | =item * |
2860 | |
8ead3603 |
2861 | We now work around a bizarre preprocessor bug in the Irix 6.5 compiler: |
2862 | C<cc -E -> unfortunately goes into K&R mode, but C<cc -E file.c> doesn't. |
3ab3a109 |
2863 | |
2864 | =back |
2865 | |
8ead3603 |
2866 | =item NetBSD |
3ab3a109 |
2867 | |
2868 | =over 4 |
2869 | |
2870 | =item * |
2871 | |
8ead3603 |
2872 | Hints now supports versions 5.*. |
3ab3a109 |
2873 | |
2874 | =back |
2875 | |
2876 | =item OpenVMS |
2877 | |
2878 | =over 4 |
2879 | |
2880 | =item * |
2881 | |
b6381718 |
2882 | C<-UDEBUGGING> is now the default on VMS. |
3ab3a109 |
2883 | |
702b4ef6 |
2884 | Like it has been everywhere else for ages and ages. Also make command-line |
2885 | selection of -UDEBUGGING and -DDEBUGGING work in configure.com; before |
2886 | the only way to turn it off was by saying no in answer to the interactive |
2887 | question. |
3ab3a109 |
2888 | |
2889 | =item * |
2890 | |
2891 | The default pipe buffer size on VMS has been updated to 8192 on 64-bit |
2892 | systems. |
2893 | |
2894 | =item * |
2895 | |
2896 | Reads from the in-memory temporary files of C<PerlIO::scalar> used to fail |
2897 | if C<$/> was set to a numeric reference (to indicate record-style reads). |
2898 | This is now fixed. |
2899 | |
2900 | =item * |
2901 | |
2902 | VMS now supports C<getgrgid>. |
2903 | |
2904 | =item * |
2905 | |
2906 | Many improvements and cleanups have been made to the VMS file name handling |
2907 | and conversion code. |
2908 | |
2909 | =item * |
2910 | |
2911 | Enabling the C<PERL_VMS_POSIX_EXIT> logical name now encodes a POSIX exit |
2912 | status in a VMS condition value for better interaction with GNV's bash |
72d4e865 |
2913 | shell and other utilities that depend on POSIX exit values. See |
3ab3a109 |
2914 | L<perlvms/"$?"> for details. |
2915 | |
2916 | =item * |
2917 | |
2918 | C<File::Copy> now detects Unix compatibility mode on VMS. |
2919 | |
2920 | =back |
2921 | |
8ead3603 |
2922 | =item Stratus VOS |
3ab3a109 |
2923 | |
8ead3603 |
2924 | =over 4 |
3ab3a109 |
2925 | |
8ead3603 |
2926 | =item * |
3ab3a109 |
2927 | |
8ead3603 |
2928 | Various changes from Stratus have been merged in. |
3ab3a109 |
2929 | |
8ead3603 |
2930 | =back |
3ab3a109 |
2931 | |
8ead3603 |
2932 | =item Symbian |
3ab3a109 |
2933 | |
8ead3603 |
2934 | =over 4 |
3ab3a109 |
2935 | |
8ead3603 |
2936 | =item * |
3ab3a109 |
2937 | |
8ead3603 |
2938 | There is now support for Symbian S60 3.2 SDK and S60 5.0 SDK. |
3ab3a109 |
2939 | |
8ead3603 |
2940 | =back |
3ab3a109 |
2941 | |
d13f8571 |
2942 | =item Windows |
3ab3a109 |
2943 | |
8ead3603 |
2944 | =over 4 |
3ab3a109 |
2945 | |
8ead3603 |
2946 | =item * |
3ab3a109 |
2947 | |
d13f8571 |
2948 | Perl 5.12 supports Windows 2000 and later. The supporting code for |
2949 | legacy versions of Windows is still included, but will be removed |
2950 | during the next development cycle. |
3ab3a109 |
2951 | |
8ead3603 |
2952 | =item * |
3ab3a109 |
2953 | |
d13f8571 |
2954 | Initial support for building Perl with MinGW-w64 is now available. |
3ab3a109 |
2955 | |
8ead3603 |
2956 | =item * |
2957 | |
d13f8571 |
2958 | F<perl.exe> now includes a manifest resource to specify the C<trustInfo> |
8ead3603 |
2959 | settings for Windows Vista and later. Without this setting Windows |
d13f8571 |
2960 | would treat F<perl.exe> as a legacy application and apply various |
8ead3603 |
2961 | heuristics like redirecting access to protected file system areas |
2962 | (like the "Program Files" folder) to the users "VirtualStore" |
2963 | instead of generating a proper "permission denied" error. |
2964 | |
d13f8571 |
2965 | The manifest resource also requests the Microsoft Common-Controls |
2966 | version 6.0 (themed controls introduced in Windows XP). Check out the |
2967 | Win32::VisualStyles module on CPAN to switch back to old style |
2968 | unthemed controls for legacy applications. |
2969 | |
2970 | =item * |
2971 | |
2972 | The C<-t> filetest operator now only returns true if the filehandle |
2973 | is connected to a console window. In previous versions of Perl it |
2974 | would return true for all character mode devices, including F<NUL> |
2975 | and F<LPT1>. |
2976 | |
2977 | =item * |
2978 | |
2979 | The C<-p> filetest operator now works correctly, and the |
2980 | Fcntl::S_IFIFO constant is defined when Perl is compiled with |
2981 | Microsoft Visual C. In previous Perl versions C<-p> always |
2982 | returned a false value, and the Fcntl::S_IFIFO constant |
2983 | was not defined. |
2984 | |
2985 | This bug is specific to Microsoft Visual C and never affected |
2986 | Perl binaries built with MinGW. |
2987 | |
2988 | =item * |
2989 | |
2990 | The socket error codes are now more widely supported: The POSIX |
2991 | module will define the symbolic names, like POSIX::EWOULDBLOCK, |
2992 | and stringification of socket error codes in $! works as well |
2993 | now; |
2994 | |
2995 | C:\>perl -MPOSIX -E "$!=POSIX::EWOULDBLOCK; say $!" |
2996 | A non-blocking socket operation could not be completed immediately. |
2997 | |
2998 | =item * |
2999 | |
3000 | flock() will now set sensible error codes in $!. Previous Perl versions |
3001 | copied the value of $^E into $!, which caused much confusion. |
3002 | |
3003 | =item * |
3004 | |
3005 | select() now supports all empty C<fd_set>s more correctly. |
8ead3603 |
3006 | |
d13f8571 |
3007 | =item * |
3008 | |
3009 | C<'.\foo'> and C<'..\foo'> were treated differently than |
3010 | C<'./foo'> and C<'../foo'> by C<do> and C<require> [RT #63492]. |
8ead3603 |
3011 | |
3012 | =item * |
3013 | |
3014 | Improved message window handling means that C<alarm> and C<kill> messages |
3015 | will no longer be dropped under race conditions. |
3016 | |
d13f8571 |
3017 | =item * |
3018 | |
3019 | Various bits of Perl's build infrastructure are no longer converted to |
3020 | win32 line endings at release time. If this hurts you, please report the |
3021 | problem with the L<perlbug> program included with perl. |
3022 | |
8ead3603 |
3023 | =back |
3ab3a109 |
3024 | |
3025 | =back |
3026 | |
b6381718 |
3027 | |
3ab3a109 |
3028 | =head1 Known Problems |
3029 | |
3030 | This is a list of some significant unfixed bugs, which are regressions |
72d4e865 |
3031 | from either 5.10.x or 5.8.x. |
3ab3a109 |
3032 | |
3033 | =over 4 |
3034 | |
3035 | =item * |
3036 | |
36914053 |
3037 | Some CPANPLUS tests may fail if there is a functioning file |
3038 | F<../../cpanp-run-perl> outside your build directory. The failure |
3039 | shouldn't imply there's a problem with the actual functional |
3040 | software. The bug is already fixed in [RT #74188] and is scheduled for |
3041 | inclusion in perl-v5.12.1. |
3042 | |
3043 | =item * |
3044 | |
3ab3a109 |
3045 | C<List::Util::first> misbehaves in the presence of a lexical C<$_> |
3046 | (typically introduced by C<my $_> or implicitly by C<given>). The variable |
3047 | which gets set for each iteration is the package variable C<$_>, not the |
3048 | lexical C<$_> [RT #67694]. |
3049 | |
3050 | A similar issue may occur in other modules that provide functions which |
3051 | take a block as their first argument, like |
3052 | |
3053 | foo { ... $_ ...} list |
3054 | |
3055 | =item * |
3056 | |
3ab3a109 |
3057 | Some regexes may run much more slowly when run in a child thread compared |
3058 | with the thread the pattern was compiled into [RT #55600]. |
3059 | |
3060 | =item * |
3061 | |
3d3a8206 |
3062 | Things like C<"\N{LATIN SMALL LIGATURE FF}" =~ /\N{LATIN SMALL LETTER F}+/> |
3063 | will appear to hang as they get into a very long running loop [RT #72998]. |
3064 | |
3065 | =item * |
3066 | |
d13f8571 |
3067 | Several porters have reported mysterious crashes when Perl's entire |
3068 | test suite is run after a build on certain Windows 2000 systems. When |
3069 | run by hand, the individual tests reportedly work fine. |
3ab3a109 |
3070 | |
b6381718 |
3071 | =back |
3072 | |
3073 | =head1 Errata |
3074 | |
3075 | =over |
3076 | |
3ab3a109 |
3077 | =item * |
3078 | |
b6381718 |
3079 | This one is actually a change introduced in 5.10.0, but it was missed |
3080 | from that release's perldelta, so it is mentioned here instead. |
3081 | |
3082 | A bugfix related to the handling of the C</m> modifier and C<qr> resulted |
3083 | in a change of behaviour between 5.8.x and 5.10.0: |
3ab3a109 |
3084 | |
b6381718 |
3085 | # matches in 5.8.x, doesn't match in 5.10.0 |
3086 | $re = qr/^bar/; "foo\nbar" =~ /$re/m; |
3ab3a109 |
3087 | |
3ab3a109 |
3088 | =back |
3089 | |
3090 | =head1 Acknowledgements |
3091 | |
3092 | Perl 5.12.0 represents approximately two years of development since |
aac88411 |
3093 | Perl 5.10.0 and contains over 750,000 lines of changes across over |
ee75e258 |
3094 | 3,000 files from over 200 authors and committers. |
aac88411 |
3095 | |
d13f8571 |
3096 | Perl continues to flourish into its third decade thanks to a vibrant |
3097 | community of users and developers. The following people are known to |
3098 | have contributed the improvements that became Perl 5.12.0: |
aac88411 |
3099 | |
3100 | Aaron Crane, Abe Timmerman, Abhijit Menon-Sen, Abigail, Adam Russell, |
3101 | Adriano Ferreira, Ævar Arnfjörð Bjarmason, Alan Grover, Alexandr |
3102 | Ciornii, Alex Davies, Alex Vandiver, Andreas Koenig, Andrew Rodland, |
3103 | andrew@sundale.net, Andy Armstrong, Andy Dougherty, Jose AUGUSTE-ETIENNE, |
3104 | Benjamin Smith, Ben Morrow, bharanee rathna, Bo Borgerson, Bo Lindbergh, |
3105 | Brad Gilbert, Bram, Brendan O'Dea, brian d foy, Charles Bailey, |
3106 | Chip Salzenberg, Chris 'BinGOs' Williams, Christoph Lamprecht, Chris |
3107 | Williams, chromatic, Claes Jakobsson, Craig A. Berry, Dan Dascalescu, |
3108 | Daniel Frederick Crisman, Daniel M. Quinlan, Dan Jacobson, Dan Kogai, |
3109 | Dave Mitchell, Dave Rolsky, David Cantrell, David Dick, David Golden, |
3110 | David Mitchell, David M. Syzdek, David Nicol, David Wheeler, Dennis |
3111 | Kaarsemaker, Dintelmann, Peter, Dominic Dunlop, Dr.Ruud, Duke Leto, |
3112 | Enrico Sorcinelli, Eric Brine, Father Chrysostomos, Florian Ragwitz, |
3113 | Frank Wiegand, Gabor Szabo, Gene Sullivan, Geoffrey T. Dairiki, George |
3114 | Greer, Gerard Goossen, Gisle Aas, Goro Fuji, Graham Barr, Green, Paul, |
3115 | Hans Dieter Pearcey, Harmen, H. Merijn Brand, Hugo van der Sanden, |
3116 | Ian Goodacre, Igor Sutton, Ingo Weinhold, James Bence, James Mastros, |
3117 | Jan Dubois, Jari Aalto, Jarkko Hietaniemi, Jay Hannah, Jerry Hedden, |
3118 | Jesse Vincent, Jim Cromie, Jody Belka, John E. Malmberg, John Malmberg, |
3119 | John Peacock, John Peacock via RT, John P. Linderman, John Wright, |
3120 | Josh ben Jore, Jos I. Boumans, Karl Williamson, Kenichi Ishigaki, Ken |
3121 | Williams, Kevin Brintnall, Kevin Ryde, Kurt Starsinic, Leon Brocard, |
3122 | Lubomir Rintel, Luke Ross, Marcel Grünauer, Marcus Holland-Moritz, Mark |
3123 | Jason Dominus, Marko Asplund, Martin Hasch, Mashrab Kuvatov, Matt Kraai, |
3124 | Matt S Trout, Max Maischein, Michael Breen, Michael Cartmell, Michael |
3125 | G Schwern, Michael Witten, Mike Giroux, Milosz Tanski, Moritz Lenz, |
3126 | Nicholas Clark, Nick Cleaton, Niko Tyni, Offer Kaye, Osvaldo Villalon, |
3127 | Paul Fenwick, Paul Gaborit, Paul Green, Paul Johnson, Paul Marquess, |
3128 | Philip Hazel, Philippe Bruhat, Rafael Garcia-Suarez, Rainer Tammer, |
3129 | Rajesh Mandalemula, Reini Urban, Renée Bäcker, Ricardo Signes, |
3130 | Ricardo SIGNES, Richard Foley, Rich Rauenzahn, Rick Delaney, Risto |
3131 | Kankkunen, Robert May, Roberto C. Sanchez, Robin Barker, SADAHIRO |
3132 | Tomoyuki, Salvador Ortiz Garcia, Sam Vilain, Scott Lanning, Sébastien |
3133 | Aperghis-Tramoni, Sérgio Durigan Júnior, Shlomi Fish, Simon 'corecode' |
3134 | Schubert, Sisyphus, Slaven Rezic, Smylers, Steffen Müller, Steffen |
3135 | Ullrich, Stepan Kasal, Steve Hay, Steven Schubiger, Steve Peters, Tels, |
3136 | The Doctor, Tim Bunce, Tim Jenness, Todd Rinaldo, Tom Christiansen, |
3137 | Tom Hukins, Tom Wyant, Tony Cook, Torsten Schoenfeld, Tye McQueen, |
3138 | Vadim Konovalov, Vincent Pit, Hio YAMASHINA, Yasuhiro Matsumoto, |
3139 | Yitzchak Scott-Thoennes, Yuval Kogman, Yves Orton, Zefram, Zsban Ambrus |
3140 | |
3141 | This is woefully incomplete as it's automatically generated from version |
3142 | control history. In particular, it doesn't include the names of the |
3143 | (very much appreciated) contributors who reported issues in previous |
3144 | versions of Perl that helped make Perl 5.12.0 better. For a more complete |
3145 | list of all of Perl's historical contributors, please see the C<AUTHORS> |
3146 | file in the Perl 5.12.0 distribution. |
3ab3a109 |
3147 | |
c8937c7e |
3148 | Our "retired" pumpkings Nicholas Clark and Rafael Garcia-Suarez |
3149 | deserve special thanks for their brilliant and substantive ongoing |
3150 | contributions. Nicholas personally authored over 30% of the patches |
3151 | since 5.10.0. Rafael comes in second in patch authorship with 11%, |
3152 | but is first by a long shot in committing patches authored by others, |
3153 | pushing 44% of the commits since 5.10.0 in this category, often after |
3154 | providing considerable coaching to the patch authors. These statistics |
3155 | in no way comprise all of their contributions, but express in shorthand |
3156 | that we couldn't have done it without them. |
3157 | |
3ab3a109 |
3158 | Many of the changes included in this version originated in the CPAN |
3159 | modules included in Perl's core. We're grateful to the entire CPAN |
3160 | community for helping Perl to flourish. |
3161 | |
3162 | =head1 Reporting Bugs |
3163 | |
3164 | If you find what you think is a bug, you might check the articles |
3165 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
72d4e865 |
3166 | bug database at L<http://rt.perl.org/perlbug/>. There may also be |
3ab3a109 |
3167 | information at L<http://www.perl.org/>, the Perl Home Page. |
3168 | |
3169 | If you believe you have an unreported bug, please run the B<perlbug> |
72d4e865 |
3170 | program included with your release. Be sure to trim your bug down |
3171 | to a tiny but sufficient test case. Your bug report, along with the |
3ab3a109 |
3172 | output of C<perl -V>, will be sent off to perlbug@perl.org to be |
3173 | analyzed by the Perl porting team. |
3174 | |
3175 | If the bug you are reporting has security implications, which make it |
3176 | inappropriate to send to a publicly archived mailing list, then please send |
3177 | it to perl5-security-report@perl.org. This points to a closed subscription |
3178 | unarchived mailing list, which includes all the core committers, who be able |
3179 | to help assess the impact of issues, figure out a resolution, and help |
3180 | co-ordinate the release of patches to mitigate or fix the problem across all |
3181 | platforms on which Perl is supported. Please only use this address for |
3182 | security issues in the Perl core, not for modules independently |
3183 | distributed on CPAN. |
3184 | |
3185 | =head1 SEE ALSO |
3186 | |
3187 | The F<Changes> file for an explanation of how to view exhaustive details |
3188 | on what changed. |
3189 | |
3190 | The F<INSTALL> file for how to build Perl. |
3191 | |
3192 | The F<README> file for general stuff. |
3193 | |
3194 | The F<Artistic> and F<Copying> files for copyright information. |
3195 | |
861ff9eb |
3196 | L<http://dev.perl.org/perl5/errata.html> for a list of issues |
3197 | found after this release, as well as a list of CPAN modules known |
3198 | to be incompatible with this release. |
3199 | |
3ab3a109 |
3200 | =cut |