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1 | =head1 NAME |
2 | |
3 | perl571delta - what's new for perl v5.7.2 |
4 | |
5 | =head1 DESCRIPTION |
6 | |
7 | This document describes differences between the 5.7.1 release and the |
8 | 5.7.2 release. |
9 | |
10 | (To view the differences between the 5.6.0 release and the 5.7.0 |
11 | release, see L<perl570delta>. To view the differences between the |
12 | 5.7.0 release and the 5.7.1 release, see L<perl571delta>.) |
13 | |
14 | =head1 Security Vulnerability Closed |
15 | |
16 | (This change was already made in 5.7.0 but bears repeating here.) |
17 | |
18 | A security vulnerability affecting all Perl versions prior to 5.6.1 |
19 | was found in August 2000. The vulnerability does not affect default |
20 | installations and as far as is known affects only the Linux platform. |
21 | |
22 | You should upgrade your Perl to 5.6.1 as soon as possible. Patches |
267a12e6 |
23 | for earlier releases exist but using the patches require full |
24 | recompilation from the source code anyway, so 5.6.1 is your best |
25 | choice. |
26 | |
43d4bbc8 |
27 | See http://www.cpan.org/src/5.0/sperl-2000-08-05/sperl-2000-08-05.txt |
28 | for more information. |
29 | |
30 | =head1 Incompatible Changes |
31 | |
699e893f |
32 | =head2 64-bit platforms and malloc |
33 | |
267a12e6 |
34 | If your pointers are 64 bits wide, the Perl malloc is no more being |
35 | used because it simply does not work with 8-byte pointers. Also, |
36 | usually the system malloc on such platforms are much better optimized |
37 | for such large memory models than the Perl malloc. |
38 | |
d7b629d9 |
39 | =head2 AIX Dynaloading |
40 | |
41 | The AIX dynaloading now uses the native dlopen interface of AIX, |
42 | (given the AIX is recent enough) instead of the old emulated interface. |
43 | This will probably break backward compatibility with compiled modules. |
44 | |
45 | =head2 Socket Extension Dynamic in VMS |
46 | |
47 | The Socket extension is now dynamically loaded instead of being |
48 | statically built in. This may or may not be a problem with ancient |
49 | TCP/IP stacks of VMS: we do not know since we weren't able to test |
50 | Perl in such configurations. |
51 | |
2796c109 |
52 | =head2 Different Definition of the Unicode Character Classes \p{In...} |
53 | |
54 | As suggested by the Unicode consortium, the Unicode character classes |
55 | now prefer I<scripts> as opposed to I<blocks> (as defined by Unicode); |
56 | in Perl, when the C<\p{In....}> and the C<\p{In....}> regular expression |
57 | constructs are used. This has changed the definition of some of those |
58 | character classes. |
59 | |
60 | The difference between scripts and blocks is that scripts are the |
61 | glyphs used by a language or a group of languages, while the blocks |
62 | are more artificial groupings of 256 characters based on the Unicode |
63 | numbering. |
64 | |
65 | In general this change results in more inclusive Unicode character |
66 | classes, but changes to the other direction also do take place: |
67 | for example while the script C<Latin> includes all the Latin |
68 | characters and their various diacritic-adorned versions, it |
69 | does not include the various punctuation or digits (since they |
70 | are not solely C<Latin>). |
71 | |
72 | Changes in the character class semantics may have happened if a script |
73 | and a block happen to have the same name, for example C<Hebrew>. |
74 | In such cases the script wins and C<\p{InHebrew}> now means the script |
75 | definition of Hebrew. The block definition in still available, |
76 | though, by appending C<Block> to the name: C<\p{InHebrewBlock}> means |
77 | what C<\p{InHebrew}> meant in perl 5.6.0. For the full list |
78 | of affected character classes, see L<perlunicode/Blocks>. |
79 | |
d7b629d9 |
80 | =head2 Deprecations |
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81 | |
82 | The current user-visible implementation of pseudo-hashes (the weird |
83 | use of the first array element) is deprecated starting from Perl 5.8.0 |
d7b629d9 |
84 | and will be removed in Perl 5.10.0, and the feature will be |
85 | implemented differently. Not only is the current interface rather |
86 | ugly, but the current implementation slows down normal array and hash |
87 | use quite noticeably. The 'fields' pragma interface will remain |
88 | available. |
89 | |
90 | The syntaxes C<@a->[...]> and C<@h->{...}> have now been deprecated. |
cbb3fa72 |
91 | |
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92 | The suidperl is also considered to be too much a risk to continue |
93 | maintaining and the suidperl code is likely to be removed in a future |
94 | release. |
95 | |
43d4bbc8 |
96 | =head1 Core Enhancements |
97 | |
d7b629d9 |
98 | In general a lot of fixing has happened in the area of Perl's |
99 | understanding of numbers, both integer and floating point. Since in |
100 | many systems the standard number parsing functions like C<strtoul()> |
101 | and C<atof()> seem to have bugs, Perl tries to work around their |
102 | deficiencies. This results hopefully in more accurate numbers. |
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103 | |
104 | =over 4 |
105 | |
106 | =item * |
107 | |
108 | The rules for allowing underscores (underbars) in numeric constants |
109 | have been relaxed and simplified: now you can have an underscore |
110 | B<between digits>. |
111 | |
112 | =item * |
113 | |
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114 | GMAGIC (right-hand side magic) could in many cases such as string |
115 | concatenation be invoked too many times. |
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116 | |
117 | =item * |
118 | |
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119 | Lexicals I: lexicals outside an eval "" weren't resolved |
120 | correctly inside a subroutine definition inside the eval "" if they |
121 | were not already referenced in the top level of the eval""ed code. |
122 | |
123 | =item * |
124 | |
125 | Lexicals II: lexicals leaked at file scope into subroutines that |
126 | were declared before the lexicals. |
127 | |
128 | =item * |
129 | |
130 | Lvalue subroutines can now return C<undef> in list context. |
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131 | |
132 | =item * |
133 | |
9108dd47 |
134 | The C<op_clear> and C<op_null> are now exported. |
267a12e6 |
135 | |
136 | =item * |
137 | |
9108dd47 |
138 | A new special regular expression variable has been introduced: |
139 | C<$^N>, which contains the most-recently closed group (submatch). |
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140 | |
141 | =item * |
142 | |
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143 | L<utime> now supports C<utime undef, undef, @files> to change the |
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144 | file timestamps to the current time. |
699e893f |
145 | |
146 | =item * |
147 | |
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148 | The Perl parser has been stress tested using both random input and |
149 | Markov chain input. |
150 | |
d7b629d9 |
151 | =item * |
152 | |
153 | C<eval "v200"> now works. |
154 | |
155 | =item * |
156 | |
157 | VMS now works under PerlIO. |
158 | |
267a12e6 |
159 | =back |
160 | |
43d4bbc8 |
161 | =head1 Modules and Pragmata |
162 | |
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163 | =head2 New Modules and Distribution |
43d4bbc8 |
164 | |
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165 | =over 4 |
166 | |
167 | =item * |
168 | |
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169 | L<Attribute::Handlers> - Simpler definition of attribute handlers |
170 | |
171 | =item * |
172 | |
173 | L<ExtUtils::Constant> - generate XS code to import C header constants |
174 | |
175 | =item * |
176 | |
177 | L<I18N::LangTags> - functions for dealing with RFC3066-style language tags |
178 | |
179 | =item * |
180 | |
181 | L<libnet> - a collection of perl5 modules related to network programming |
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182 | |
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183 | Perl installation leaves libnet unconfigured, use F<libnetcfg> to configure. |
184 | |
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185 | =item * |
186 | |
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187 | L<List::Util> - selection of general-utility list subroutines |
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188 | |
189 | =item * |
190 | |
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191 | L<Locale::Maketext> - framework for localization |
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192 | |
193 | =item * |
194 | |
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195 | L<Memoize> - Make your functions faster by trading space for time |
267a12e6 |
196 | |
197 | =item * |
198 | |
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199 | L<NEXT> - pseudo-class for method redispatch |
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200 | |
201 | =item * |
202 | |
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203 | L<Scalar::Util> - selection of general-utility scalar subroutines |
267a12e6 |
204 | |
205 | =item * |
206 | |
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207 | L<Test::More> - yet another framework for writing test scripts |
208 | |
209 | =item * |
210 | |
211 | L<Test::Simple> - Basic utilities for writing tests |
212 | |
213 | =item * |
214 | |
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215 | L<Time::HiRes> - high resolution ualarm, usleep, and gettimeofday |
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216 | |
217 | =item * |
218 | |
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219 | L<Time::Piece> - Object Oriented time objects |
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220 | |
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221 | (Previously known as L<Time::Object>.) |
222 | |
267a12e6 |
223 | =back |
224 | |
43d4bbc8 |
225 | =head2 Updated And Improved Modules and Pragmata |
226 | |
267a12e6 |
227 | =over 4 |
228 | |
229 | =item * |
230 | |
231 | L<B::Deparse> module has been significantly enhanced. It now |
232 | can deparse almost all of the standard test suite (so that the |
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233 | tests still succeed). There is a make target "test.deparse" |
234 | for trying this out. |
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235 | |
236 | =item * |
237 | |
238 | L<Class::Struct> now assigns the array/hash element if the accessor |
239 | is called with an array/hash element as the B<sole> argument. |
240 | |
241 | =item * |
242 | |
243 | L<Cwd> extension is now (even) faster. |
244 | |
245 | =item * |
246 | |
247 | L<DB_File> extension has been updated to version 1.77. |
248 | |
249 | =item * |
250 | |
251 | L<Fcntl>, L<Socket>, and L<Sys::Syslog> have been rewritten to use the |
252 | new-style constant dispatch section (see L<ExtUtils::Constant>). |
253 | |
254 | =item * |
255 | |
699e893f |
256 | L<File::Find> is now (again) reentrant. It also has been made |
257 | more portable. |
258 | |
259 | =item * |
260 | |
267a12e6 |
261 | L<File::Glob> now supports C<GLOB_LIMIT> constant to limit the |
262 | size of the returned list of filenames. |
263 | |
699e893f |
264 | =item * |
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265 | |
d7b629d9 |
266 | L<IO::Socket::INET> now supports C<LocalPort> of zero (usually meaning |
267 | that the operating system will make one up.) |
268 | |
269 | =item * |
270 | |
271 | The L<vars> pragma now supports declaring fully qualified variables. |
272 | (Something that C<our()> does not and will not support.) |
699e893f |
273 | |
274 | =back |
43d4bbc8 |
275 | |
276 | =head1 Utility Changes |
277 | |
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278 | =over 4 |
279 | |
280 | =item * |
281 | |
699e893f |
282 | The F<emacs/e2ctags.pl> is now much faster. |
283 | |
284 | =item * |
285 | |
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286 | L<h2ph> now supports C trigraphs. |
287 | |
288 | =item * |
289 | |
267a12e6 |
290 | L<h2xs> uses the new L<ExtUtils::Constant> module which will affect |
291 | newly created extensions that define constants. Since the new code is |
292 | more correct (if you have two constants where the first one is a |
293 | prefix of the second one, the first constant B<never> gets defined), |
294 | less lossy (it uses integers for integer constant, as opposed to the |
295 | old code that used floating point numbers even for integer constants), |
296 | and slightly faster, you might want to consider regenerating your |
297 | extension code (the new scheme makes regenerating easy). |
298 | |
299 | =item * |
300 | |
699e893f |
301 | L<libnetcfg> has been added to configure the libnet. |
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302 | |
303 | =item * |
304 | |
305 | The F<Pod::Html> (and thusly L<pod2html>) now allows specifying |
306 | a cache directory. |
307 | |
308 | =back |
309 | |
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310 | =head1 New Documentation |
311 | |
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312 | =over 4 |
313 | |
314 | =item * |
315 | |
316 | L<Locale::Maketext::TPJ13> is an article about software localization, |
317 | originally published in The Perl Journal #13, republished here with |
318 | kind permission. |
319 | |
320 | =item * |
321 | |
322 | More README.$PLATFORM files have been converted into pod, which also |
323 | means that they also be installed as perl$PLATFORM documentation |
324 | files. The new files are L<perlapollo>, L<perlbeos>, L<perldgux>, |
699e893f |
325 | L<perlhurd>, L<perlmint>, L<perlnetware>, L<perlplan9>, L<perlqnx>, |
326 | and L<perltru64>. |
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327 | |
328 | =item * |
329 | |
330 | The F<Todo> and F<Todo-5.6> files have been merged into L<perltodo>. |
331 | |
332 | =item * |
333 | |
7ebe6671 |
334 | Use of the F<gprof> tool to profile Perl has been documented in |
335 | L<perlhack>. There is a make target "perl.gprof" for generating a |
336 | gprofiled Perl executable. |
267a12e6 |
337 | |
338 | =back |
339 | |
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340 | =head1 Installation and Configuration Improvements |
341 | |
342 | =head2 New Or Improved Platforms |
343 | |
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344 | =over 4 |
345 | |
346 | =item * |
347 | |
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348 | AIX should now work better with gcc. Also longdouble support in AIX |
349 | should be better now. See L<perlaix>. |
267a12e6 |
350 | |
351 | =item * |
352 | |
353 | AtheOS (http://www.atheos.cx/) is a new platform. |
354 | |
355 | =item * |
356 | |
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357 | DG/UX platform now supports the 5.005-style threads. See L<perldgux>. |
267a12e6 |
358 | |
359 | =item * |
360 | |
7ebe6671 |
361 | Several MacOS (Classic) portability patches have been applied. We |
362 | hope to get a fully working port by 5.8.0. (The remaining problems |
363 | relate to the changed IO model of Perl.) See L<perlmacos>. |
267a12e6 |
364 | |
365 | =item * |
366 | |
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367 | MacOS X (or Darwin) should now be able to build Perl even on HFS+ |
368 | filesystems. (The case-insensitivity confused the Perl build process.) |
267a12e6 |
369 | |
370 | =item * |
371 | |
7ebe6671 |
372 | NetWare from Novell is now supported. See L<perlnetware>. |
267a12e6 |
373 | |
374 | =item * |
375 | |
376 | The Amdahl UTS UNIX mainframe platform is now supported. |
377 | |
378 | =back |
379 | |
43d4bbc8 |
380 | =head2 Generic Improvements |
381 | |
267a12e6 |
382 | =over 4 |
383 | |
384 | =item * |
385 | |
267a12e6 |
386 | In AFS installations one can configure the root of the AFS to be |
387 | somewhere else than the default F</afs> by using the Configure |
388 | parameter C<-Dafsroot=/some/where/else>. |
389 | |
390 | =item * |
391 | |
392 | The version of Berkeley DB used when the Perl (and, presumably, the |
393 | DB_File extension) was built is now available as |
394 | C<@Config{qw(db_version_major db_version_minor db_version_patch)}> |
395 | from Perl and as C<DB_VERSION_MAJOR_CFG DB_VERSION_MINOR_CFG |
396 | DB_VERSION_PATCH_CFG> from C. |
397 | |
398 | =item * |
399 | |
699e893f |
400 | The Thread extension is now not built at all under ithreads |
401 | (C<Configure -Duseithreads>) because it wouldn't work anyway (the |
402 | Thread extension requires being Configured with C<-Duse5005threads>). |
267a12e6 |
403 | |
404 | =item * |
405 | |
406 | The C<B::Deparse> compiler backend has been so significantly improved |
407 | that almost the whole Perl test suite passes after being deparsed. A |
408 | make target has been added to help in further testing: C<make test.deparse>. |
409 | |
410 | =back |
411 | |
43d4bbc8 |
412 | =head1 Selected Bug Fixes |
413 | |
699e893f |
414 | =over 5 |
415 | |
416 | =item * |
417 | |
418 | The autouse pragma didn't work for Multi::Part::Function::Names. |
419 | |
420 | =item * |
421 | |
422 | The behaviour of non-decimal but numeric string constants such as |
423 | "0x23" was platform-dependent: in some platforms that was seen as 35, |
424 | in some as 0, in some as a floating point number (don't ask). This |
425 | was caused by Perl using the operating system libraries in a situation |
426 | where the result of the string to number conversion is undefined: now |
427 | Perl consistently handles such strings as zero in numeric contexts. |
428 | |
429 | =item * |
430 | |
431 | L<dprofpp> -R didn't work. |
432 | |
433 | =item * |
434 | |
435 | PERL5OPT with embedded spaces didn't work. |
436 | |
437 | =item * |
438 | |
439 | L<Sys::Syslog> ignored the C<LOG_AUTH> constant. |
440 | |
441 | =back |
442 | |
43d4bbc8 |
443 | =head2 Platform Specific Changes and Fixes |
444 | |
267a12e6 |
445 | =over 4 |
446 | |
447 | =item * |
448 | |
449 | Some versions of glibc have a broken modfl(). This affects builds |
450 | with C<-Duselongdouble>. This version of Perl detects this brokenness |
451 | and has a workaround for it. The glibc release 2.2.2 is known to have |
452 | fixed the modfl() bug. |
453 | |
454 | =back |
455 | |
43d4bbc8 |
456 | =head1 New or Changed Diagnostics |
457 | |
267a12e6 |
458 | =over 4 |
459 | |
460 | =item * |
461 | |
462 | In the regular expression diagnostics the C<E<lt>E<lt> HERE> marker |
463 | introduced in 5.7.0 has been changed to be C<E<lt>-- HERE> since too |
464 | many people found the C<E<lt>E<lt>> to be too similar to here-document |
465 | starters. |
466 | |
467 | =item * |
468 | |
469 | If you try to L<perlfunc/pack> a number less than 0 or larger than 255 |
470 | using the C<"C"> format you will get an optional warning. Similarly |
471 | for the C<"c"> format and a number less than -128 or more than 127. |
472 | |
473 | =item * |
474 | |
475 | Certain regex modifiers such as C<(?o)> make sense only if applied to |
476 | the entire regex. You will an optional warning if you try to do otherwise. |
477 | |
478 | =item * |
479 | |
480 | Using arrays or hashes as references (e.g. C<%foo->{bar}> has been |
481 | deprecated for a while. Now you will get an optional warning. |
482 | |
483 | =back |
484 | |
9108dd47 |
485 | =head1 Source Code Enhancements |
486 | |
487 | =head2 MAGIC constants |
488 | |
489 | The MAGIC constants (e.g. C<'P'>) have been macrofied |
490 | (e.g. C<PERL_MAGIC_TIED>) for better source code readability |
491 | and maintainability. |
492 | |
493 | =head2 Better commented code |
494 | |
495 | F<perly.c>, F<sv.c>, and F<sv.h> have now been extensively commented. |
43d4bbc8 |
496 | |
497 | =head2 Regex pre-/post-compilation items matched up |
498 | |
499 | The regex compiler now maintains a structure that identifies nodes in |
500 | the compiled bytecode with the corresponding syntactic features of the |
501 | original regex expression. The information is attached to the new |
502 | C<offsets> member of the C<struct regexp>. See L<perldebguts> for more |
503 | complete information. |
504 | |
9108dd47 |
505 | =head2 gcc -Wall |
506 | |
507 | The C code has been made much more C<gcc -Wall> clean. Some warning |
508 | messages still remain, though, so if you are compiling with gcc you |
509 | will see some warnings about dubious practices. The warnings are |
510 | being worked on. |
511 | |
43d4bbc8 |
512 | =head1 New Tests |
513 | |
267a12e6 |
514 | Several new tests have been added, especially for the F<lib> subsection. |
515 | |
699e893f |
516 | The tests are now reported in a different order than in earlier Perls. |
517 | (This happens because the test scripts from under t/lib have been moved |
518 | to be closer to the library/extension they are testing.) |
267a12e6 |
519 | |
43d4bbc8 |
520 | =head1 Known Problems |
521 | |
522 | Note that unlike other sections in this document (which describe |
523 | changes since 5.7.0) this section is cumulative containing known |
524 | problems for all the 5.7 releases. |
525 | |
81633404 |
526 | =head2 AIX |
527 | |
528 | =over 4 |
529 | |
530 | =item * |
531 | |
532 | If Perl is configured to use long doubles the op/int subtests 13 and |
533 | 14 and the ext/POSIX subtest 14 may fail. |
534 | |
535 | =item * |
536 | |
537 | If Perl is configured to use threads the op/magic subtest 28 may fail. |
538 | |
539 | =item * |
540 | |
541 | vac 5.0.0.0 May Produce Buggy Code For Perl |
43d4bbc8 |
542 | |
543 | The AIX C compiler vac version 5.0.0.0 may produce buggy code, |
544 | resulting in few random tests failing, but when the failing tests |
545 | are run by hand, they succeed. We suggest upgrading to at least |
546 | vac version 5.0.1.0, that has been known to compile Perl correctly. |
547 | "lslpp -L|grep vac.C" will tell you the vac version. |
548 | |
81633404 |
549 | =back |
550 | |
d7b629d9 |
551 | =head2 Amiga Perl Invoking Mystery |
552 | |
553 | One cannot call Perl using the C<volume:> syntax, that is, C<perl -v> |
554 | works, but for example C<bin:perl -v> doesn't. The exact reason is |
555 | known but the current suspect is the F<ixemul> library. |
556 | |
43d4bbc8 |
557 | =head2 lib/ftmp-security tests warn 'system possibly insecure' |
558 | |
559 | Don't panic. Read INSTALL 'make test' section instead. |
560 | |
19d94770 |
561 | =head2 Cygwin intermittent failures of lib/Memoize/t/expire_file 11 and 12 |
81633404 |
562 | |
563 | The subtests 11 and 12 sometimes fail and sometimes work. |
564 | |
565 | =head2 HP-UX lib/io_multihomed Fails When LP64-Configur |
43d4bbc8 |
566 | |
567 | The lib/io_multihomed test may hang in HP-UX if Perl has been |
568 | configured to be 64-bit. Because other 64-bit platforms do not hang in |
569 | this test, HP-UX is suspect. All other tests pass in 64-bit HP-UX. The |
570 | test attempts to create and connect to "multihomed" sockets (sockets |
571 | which have multiple IP addresses). |
572 | |
81633404 |
573 | =head2 HP-UX lib/posix Subtest 9 Fails When LP64-Configured |
43d4bbc8 |
574 | |
575 | If perl is configured with -Duse64bitall, the successful result of the |
576 | subtest 10 of lib/posix may arrive before the successful result of the |
577 | subtest 9, which confuses the test harness so much that it thinks the |
578 | subtest 9 failed. |
579 | |
43d4bbc8 |
580 | =head2 Linux With Sfio Fails op/misc Test 48 |
581 | |
582 | No known fix. |
583 | |
ee9f9f3a |
584 | =head2 OS/390 |
585 | |
586 | OS/390 has rather many test failures but the situation is actually |
587 | better than it was in 5.6.0, it's just that so many new modules and |
588 | tests have been added. |
589 | |
590 | Failed Test Stat Wstat Total Fail Failed List of Failed |
591 | ----------------------------------------------------------------------------- |
592 | ../ext/B/Deparse.t 14 1 7.14% 14 |
593 | ../ext/B/Showlex.t 1 1 100.00% 1 |
594 | ../ext/Encode/Encode/Tcl.t 610 13 2.13% 592 594 596 598 |
595 | 600 602 604-610 |
596 | ../ext/IO/lib/IO/t/io_unix.t 113 28928 5 3 60.00% 3-5 |
597 | ../ext/POSIX/POSIX.t 29 1 3.45% 14 |
598 | ../ext/Storable/t/lock.t 255 65280 5 3 60.00% 3-5 |
599 | ../lib/locale.t 129 33024 117 19 16.24% 99-117 |
600 | ../lib/warnings.t 434 1 0.23% 75 |
601 | ../lib/ExtUtils.t 27 1 3.70% 25 |
602 | ../lib/Math/BigInt/t/bigintpm.t 1190 1 0.08% 1145 |
603 | ../lib/Unicode/UCD.t 81 48 59.26% 1-16 49-64 66-81 |
604 | ../lib/User/pwent.t 9 1 11.11% 4 |
605 | op/pat.t 660 6 0.91% 242-243 424-425 |
606 | 626-627 |
607 | op/split.t 0 9 ?? ?? % ?? |
608 | op/taint.t 174 3 1.72% 156 162 168 |
609 | op/tr.t 70 3 4.29% 50 58-59 |
610 | Failed 16/422 test scripts, 96.21% okay. 105/23251 subtests failed, 99.55% okay. |
611 | |
c4b279ff |
612 | =head2 op/sprintf tests 129 and 130 |
43d4bbc8 |
613 | |
614 | The op/sprintf tests 129 and 130 are known to fail on some platforms. |
615 | Examples include any platform using sfio, and Compaq/Tandem's NonStop-UX. |
616 | The failing platforms do not comply with the ANSI C Standard, line |
617 | 19ff on page 134 of ANSI X3.159 1989 to be exact. (They produce |
618 | something else than "1" and "-1" when formatting 0.6 and -0.6 using |
619 | the printf format "%.0f", most often they produce "0" and "-0".) |
620 | |
621 | =head2 Failure of Thread tests |
622 | |
45215428 |
623 | B<Note that support for 5.005-style threading remains experimental.> |
624 | |
625 | The following tests are known to fail due to fundamental problems in |
626 | the 5.005 threading implementation. These are not new failures--Perl |
627 | 5.005_0x has the same bugs, but didn't have these tests. |
628 | |
c4b279ff |
629 | lib/autouse.t 4 |
630 | t/lib/thr5005.t 19-20 |
631 | |
81633404 |
632 | =head2 UNICOS |
633 | |
634 | =over 4 |
635 | |
636 | =item * |
637 | |
638 | ext/POSIX/sigaction subtests 6 and 13 may fail. |
639 | |
640 | =item * |
641 | |
642 | lib/ExtUtils may spuriously claim that subtest 28 failed, |
643 | which is interesting since the test only has 27 tests. |
644 | |
645 | =item * |
646 | |
647 | Numerous numerical test failures |
c4b279ff |
648 | |
649 | op/numconvert 209,210,217,218 |
81633404 |
650 | op/override 7 |
c4b279ff |
651 | ext/Time/HiRes/HiRes 9 |
652 | lib/Math/BigInt/t/bigintpm 1145 |
653 | lib/Math/Trig 25 |
654 | |
655 | These tests fail because of yet unresolved floating point inaccuracies. |
656 | |
81633404 |
657 | =back |
658 | |
659 | =head2 UNICOS/mk ext/IPC/SysV/t/sem test 8 |
c4b279ff |
660 | |
661 | No known fix. |
43d4bbc8 |
662 | |
81633404 |
663 | =head2 UTS |
664 | |
665 | Many floating point inaccuracies: |
666 | |
0aa7ccc3 |
667 | op/numconvert 511,657,658,659,665-667,831,991,1151 |
668 | op/pack 10,22,149,156 |
669 | op/sprintf 8,10,13,102-107,134-135,146-153,159-162 |
670 | lib/Math/BigInt/bigintpm 1145,1183 |
671 | lib/Math/Complex 250,257,514,521,722-724, |
672 | 934,935,945,949,955,956,975,976 |
673 | ext/POSIX/POSIX 14 |
674 | |
675 | =head2 VMS |
676 | |
ee9f9f3a |
677 | Rather many tests are failing in VMS but that actually more tests |
678 | succeed in VMS than they used to, it's just that there are many, |
679 | many more tests than there used to be. |
680 | |
681 | Here are the known failures from some compiler/platform combinations. |
682 | |
0aa7ccc3 |
683 | DEC C V5.3-006 on OpenVMS VAX V6.2 |
684 | |
685 | [-.ext.list.util.t]tainted..............FAILED on test 3 |
686 | [-.ext.posix]sigaction..................FAILED on test 7 |
50bd9457 |
687 | [-.ext.time.hires]hires.................FAILED on test 14 |
0aa7ccc3 |
688 | [-.lib.file.find]taint..................FAILED on test 17 |
689 | [-.lib.math.bigint.t]bigintpm...........FAILED on test 1183 |
690 | [-.lib.test.simple.t]exit...............FAILED on test 1 |
691 | [.lib]vmsish............................FAILED on test 13 |
692 | [.op]sprintf............................FAILED on test 12 |
693 | Failed 8/399 tests, 91.23% okay. |
694 | |
695 | DEC C V6.0-001 on OpenVMS Alpha V7.2-1 |
696 | |
697 | [-.ext.list.util.t]tainted..............FAILED on test 3 |
698 | [-.lib.file.find]taint..................FAILED on test 17 |
699 | [-.lib.test.simple.t]exit...............FAILED on test 1 |
700 | [.lib]vmsish............................FAILED on test 13 |
701 | Failed 4/399 tests, 92.48% okay. |
81633404 |
702 | |
20a07785 |
703 | Compac C V6.4-005 on OpenVMS Alpha 7.2.1 |
704 | |
705 | [-.ext.b]showlex........................FAILED on test 1 |
706 | [-.ext.list.util.t]tainted..............FAILED on test 3 |
707 | [-.lib.file.find]taint..................FAILED on test 17 |
708 | [-.lib.test.simple.t]exit...............FAILED on test 1 |
709 | [.lib]vmsish............................FAILED on test 13 |
710 | [.op]misc...............................FAILED on test 49 |
711 | Failed 6/401 tests, 92.77% okay. |
712 | |
43d4bbc8 |
713 | =head2 Localising a Tied Variable Leaks Memory |
714 | |
715 | use Tie::Hash; |
716 | tie my %tie_hash => 'Tie::StdHash'; |
717 | |
718 | ... |
719 | |
720 | local($tie_hash{Foo}) = 1; # leaks |
721 | |
722 | Code like the above is known to leak memory every time the local() |
723 | is executed. |
724 | |
725 | =head2 Self-tying of Arrays and Hashes Is Forbidden |
726 | |
727 | Self-tying of arrays and hashes is broken in rather deep and |
728 | hard-to-fix ways. As a stop-gap measure to avoid people from getting |
729 | frustrated at the mysterious results (core dumps, most often) it is |
730 | for now forbidden (you will get a fatal error even from an attempt). |
731 | |
699e893f |
732 | =head2 Variable Attributes are not Currently Usable for Tieing |
733 | |
734 | This limitation will hopefully be fixed in future. (Subroutine |
735 | attributes work fine for tieing, see L<Attribute::Handlers>). |
736 | |
43d4bbc8 |
737 | =head2 Building Extensions Can Fail Because Of Largefiles |
738 | |
739 | Some extensions like mod_perl are known to have issues with |
740 | `largefiles', a change brought by Perl 5.6.0 in which file offsets |
741 | default to 64 bits wide, where supported. Modules may fail to compile |
742 | at all or compile and work incorrectly. Currently there is no good |
743 | solution for the problem, but Configure now provides appropriate |
744 | non-largefile ccflags, ldflags, libswanted, and libs in the %Config |
745 | hash (e.g., $Config{ccflags_nolargefiles}) so the extensions that are |
746 | having problems can try configuring themselves without the |
747 | largefileness. This is admittedly not a clean solution, and the |
748 | solution may not even work at all. One potential failure is whether |
749 | one can (or, if one can, whether it's a good idea) link together at |
750 | all binaries with different ideas about file offsets, all this is |
751 | platform-dependent. |
752 | |
753 | =head2 The Compiler Suite Is Still Experimental |
754 | |
755 | The compiler suite is slowly getting better but is nowhere near |
756 | working order yet. |
757 | |
81633404 |
758 | =head2 The Long Double Support is Still Experimental |
759 | |
760 | The ability to configure Perl's numbers to use "long doubles", |
761 | floating point numbers of hopefully better accuracy, is still |
762 | experimental. The implementations of long doubles are not yet |
763 | widespread and the existing implementations are not quite mature |
764 | or standardised, therefore trying to support them is a rare |
765 | and moving target. The gain of more precision may also be offset |
766 | by slowdown in computations (more bits to move around, and the |
767 | operations are more likely to be executed by less optimised |
768 | libraries). |
769 | |
43d4bbc8 |
770 | =head1 Reporting Bugs |
771 | |
772 | If you find what you think is a bug, you might check the articles |
773 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
774 | bug database at http://bugs.perl.org. There may also be |
775 | information at http://www.perl.com/perl/, the Perl Home Page. |
776 | |
777 | If you believe you have an unreported bug, please run the B<perlbug> |
778 | program included with your release. Be sure to trim your bug down |
779 | to a tiny but sufficient test case. Your bug report, along with the |
780 | output of C<perl -V>, will be sent off to perlbug@perl.org to be |
781 | analysed by the Perl porting team. |
782 | |
783 | =head1 SEE ALSO |
784 | |
785 | The F<Changes> file for exhaustive details on what changed. |
786 | |
787 | The F<INSTALL> file for how to build Perl. |
788 | |
789 | The F<README> file for general stuff. |
790 | |
791 | The F<Artistic> and F<Copying> files for copyright information. |
792 | |
793 | =head1 HISTORY |
794 | |
795 | Written by Jarkko Hietaniemi <F<jhi@iki.fi>>, with many contributions |
796 | from The Perl Porters and Perl Users submitting feedback and patches. |
797 | |
798 | Send omissions or corrections to <F<perlbug@perl.org>>. |
799 | |
800 | =cut |