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