1PERL5300DELTA(1) Perl Programmers Reference Guide PERL5300DELTA(1)
2
6 perl5300delta - what is new for perl v5.30.0
7
9 This document describes differences between the 5.28.0 release and the
10 5.30.0 release.
11 If you are upgrading from an earlier release such as 5.26.0, first read
13 perl5280delta, which describes differences between 5.26.0 and 5.28.0.
14
16 sv_utf8_(downgrade|decode) are no longer marked as experimental. [perl
17 #133788] <https://rt.perl.org/Ticket/Display.html?id=133788>.
18
20 Limited variable length lookbehind in regular expression pattern matching
21 is now experimentally supported
22 Using a lookbehind assertion (like "(?<=foo?)" or "(?<!ba{1,9}r)"
23 previously would generate an error and refuse to compile. Now it
24 compiles (if the maximum lookbehind is at most 255 characters), but
25 raises a warning in the new "experimental::vlb" warnings category.
26 This is to caution you that the precise behavior is subject to change
27 based on feedback from use in the field.
28 See "(?<=pattern)" in perlre and "(?<!pattern)" in perlre.
30 The upper limit "n" specifiable in a regular expression quantifier of the
32 form "{m,n}" has been doubled to 65534
33 The meaning of an unbounded upper quantifier "{m,}" remains unchanged.
34 It matches 2**31 - 1 times on most platforms, and more on ones where a
35 C language short variable is more than 4 bytes long.
36 Unicode 12.1 is supported
38 Because of a change in Unicode release cycles, Perl jumps from Unicode
39 10.0 in Perl 5.28 to Unicode 12.1 in Perl 5.30.
40 For details on the Unicode changes, see
42 <https://www.unicode.org/versions/Unicode11.0.0/> for 11.0;
43 <https://www.unicode.org/versions/Unicode12.0.0/> for 12.0; and
44 <https://www.unicode.org/versions/Unicode12.1.0/> for 12.1. (Unicode
45 12.1 differs from 12.0 only in the addition of a single character, that
46 for the new Japanese era name.)
47 The Word_Break property, as in past Perl releases, remains tailored to
49 behave more in line with expectations of Perl users. This means that
50 sequential runs of horizontal white space characters are not broken
51 apart, but kept as a single run. Unicode 11 changed from past versions
52 to be more in line with Perl, but it left several white space
53 characters as causing breaks: TAB, NO BREAK SPACE, and FIGURE SPACE
54 (U+2007). We have decided to continue to use the previous Perl
55 tailoring with regards to these.
56 Wildcards in Unicode property value specifications are now partially
58 supported
59 You can now do something like this in a regular expression pattern
60 qr! \p{nv= /(?x) \A [0-5] \z / }!
62 which matches all Unicode code points whose numeric value is between 0
64 and 5 inclusive. So, it could match the Thai or Bengali digits whose
65 numeric values are 0, 1, 2, 3, 4, or 5.
66 This marks another step in implementing the regular expression features
68 the Unicode Consortium suggests.
69 Most properties are supported, with the remainder planned for 5.32.
71 Details are in "Wildcards in Property Values" in perlunicode.
72 qr'\N{name}' is now supported
74 Previously it was an error to evaluate a named character "\N{...}"
75 within a single quoted regular expression pattern (whose evaluation is
76 deferred from the normal place). This restriction is now removed.
77 Turkic UTF-8 locales are now seamlessly supported
79 Turkic languages have different casing rules than other languages for
80 the characters "i" and "I". The uppercase of "i" is LATIN CAPITAL
81 LETTER I WITH DOT ABOVE (U+0130); and the lowercase of "I" is LATIN
82 SMALL LETTER DOTLESS I (U+0131). Unicode furnishes alternate casing
83 rules for use with Turkic languages. Previously, Perl ignored these,
84 but now, it uses them when it detects that it is operating under a
85 Turkic UTF-8 locale.
86 It is now possible to compile perl to always use thread-safe locale
88 operations.
89 Previously, these calls were only used when the perl was compiled to be
90 multi-threaded. To always enable them, add
91 -Accflags='-DUSE_THREAD_SAFE_LOCALE'
93 to your Configure flags.
95 Eliminate opASSIGN macro usage from core
97 This macro is still defined but no longer used in core
98 "-Drv" now means something on "-DDEBUGGING" builds
100 Now, adding the verbose flag ("-Dv") to the "-Dr" flag turns on all
101 possible regular expression debugging.
102
104 Assigning non-zero to $[ is fatal
105 Setting $[ to a non-zero value has been deprecated since Perl 5.12 and
106 now throws a fatal error. See "Assigning non-zero to $[ is fatal" in
107 perldeprecation.
108 Delimiters must now be graphemes
110 See "Use of unassigned code point or non-standalone grapheme for a
111 delimiter." in perldeprecation
112 Some formerly deprecated uses of an unescaped left brace "{" in regular
114 expression patterns are now illegal
115 But to avoid breaking code unnecessarily, most instances that issued a
116 deprecation warning, remain legal and now have a non-deprecation
117 warning raised. See "Unescaped left braces in regular expressions" in
118 perldeprecation.
119 Previously deprecated sysread()/syswrite() on :utf8 handles is now fatal
121 Calling sysread(), syswrite(), send() or recv() on a ":utf8" handle,
122 whether applied explicitly or implicitly, is now fatal. This was
123 deprecated in perl 5.24.
124 There were two problems with calling these functions on ":utf8"
126 handles:
127 · All four functions only paid attention to the ":utf8" flag. Other
129 layers were completely ignored, so a handle with
130 ":encoding(UTF-16LE)" layer would be treated as UTF-8. Other
131 layers, such as compression are completely ignored with or without
132 the ":utf8" flag.
133 · sysread() and recv() would read from the handle, skipping any
135 validation by the layers, and do no validation of their own. This
136 could lead to invalidly encoded perl scalars.
137 [perl #125760] <https://rt.perl.org/Ticket/Display.html?id=125760>.
139 my() in false conditional prohibited
141 Declarations such as "my $x if 0" are no longer permitted.
142 [perl #133543] <https://rt.perl.org/Ticket/Display.html?id=133543>.
144 Fatalize $* and $#
146 These special variables, long deprecated, now throw exceptions when
147 used.
148 [perl #133583] <https://rt.perl.org/Ticket/Display.html?id=133583>.
150 Fatalize unqualified use of dump()
152 The "dump()" function, long discouraged, may no longer be used unless
153 it is fully qualified, i.e., "CORE::dump()".
154 [perl #133584] <https://rt.perl.org/Ticket/Display.html?id=133584>.
156 Remove File::Glob::glob()
158 The "File::Glob::glob()" function, long deprecated, has been removed
159 and now throws an exception which advises use of
160 "File::Glob::bsd_glob()" instead.
161 [perl #133586] <https://rt.perl.org/Ticket/Display.html?id=133586>.
163 "pack()" no longer can return malformed UTF-8
165 It croaks if it would otherwise return a UTF-8 string that contains
166 malformed UTF-8. This protects against potential security threats.
167 This is considered a bug fix as well. [perl #131642]
168 <https://rt.perl.org/Ticket/Display.html?id=131642>.
169 Any set of digits in the Common script are legal in a script run of another
171 script
172 There are several sets of digits in the Common script. "[0-9]" is the
173 most familiar. But there are also "[\x{FF10}-\x{FF19}]" (FULLWIDTH
174 DIGIT ZERO - FULLWIDTH DIGIT NINE), and several sets for use in
175 mathematical notation, such as the MATHEMATICAL DOUBLE-STRUCK DIGITs.
176 Any of these sets should be able to appear in script runs of, say,
177 Greek. But the design of 5.30 overlooked all but the ASCII digits
178 "[0-9]", so the design was flawed. This has been fixed, so is both a
179 bug fix and an incompatibility. [perl #133547]
180 <https://rt.perl.org/Ticket/Display.html?id=133547>.
181 All digits in a run still have to come from the same set of ten digits.
183 JSON::PP enables allow_nonref by default
185 As JSON::XS 4.0 changed its policy and enabled allow_nonref by default,
186 JSON::PP also enabled allow_nonref by default.
187
189 In XS code, use of various macros dealing with UTF-8.
190 This deprecation was scheduled to become fatal in 5.30, but has been
191 delayed to 5.32 due to problems that showed up with some CPAN modules.
192 For details of what's affected, see perldeprecation.
193
195 · Translating from UTF-8 into the code point it represents now is
196 done via a deterministic finite automaton, speeding it up. As a
197 typical example, "ord("\x7fff")" now requires 12% fewer
198 instructions than before. The performance of checking that a
199 sequence of bytes is valid UTF-8 is similarly improved, again by
200 using a DFA.
201 · Eliminate recursion from finalize_op(). [perl #108276]
203 <https://rt.perl.org/Ticket/Display.html?id=108276>.
204 · A handful of small optimizations related to character folding and
206 character classes in regular expressions.
207 · Optimization of "IV" to "UV" conversions. [perl #133677]
209 <https://rt.perl.org/Ticket/Display.html?id=133677>.
210 · Speed up of the integer stringification algorithm by processing two
212 digits at a time instead of one. [perl #133691]
213 <https://rt.perl.org/Ticket/Display.html?id=133691>.
214 · Improvements based on LGTM analysis and recommendation.
216 (<https://lgtm.com/projects/g/Perl/perl5/alerts/?mode=tree>).
217 [perl #133686] <https://rt.perl.org/Ticket/Display.html?id=133686>.
218 [perl #133699] <https://rt.perl.org/Ticket/Display.html?id=133699>.
219 · Code optimizations in regcomp.c, regcomp.h, regexec.c.
221 · Regular expression pattern matching of things like "qr/[^a]/" is
223 significantly sped up, where a is any ASCII character. Other
224 classes can get this speed up, but which ones is complicated and
225 depends on the underlying bit patterns of those characters, so
226 differs between ASCII and EBCDIC platforms, but all case pairs,
227 like "qr/[Gg]/" are included, as is "[^01]".
228
230 Updated Modules and Pragmata
231 · Archive::Tar has been upgraded from version 2.30 to 2.32.
232 · B has been upgraded from version 1.74 to 1.76.
234 · B::Concise has been upgraded from version 1.003 to 1.004.
236 · B::Deparse has been upgraded from version 1.48 to 1.49.
238 · bignum has been upgraded from version 0.49 to 0.51.
240 · bytes has been upgraded from version 1.06 to 1.07.
242 · Carp has been upgraded from version 1.38 to 1.50
244 · Compress::Raw::Bzip2 has been upgraded from version 2.074 to 2.084.
246 · Compress::Raw::Zlib has been upgraded from version 2.076 to 2.084.
248 · Config::Extensions has been upgraded from version 0.02 to 0.03.
250 · Config::Perl::V. has been upgraded from version 0.29 to 0.32. This
252 was due to a new configuration variable that has influence on
253 binary compatibility: "USE_THREAD_SAFE_LOCALE".
254 · CPAN has been upgraded from version 2.20 to 2.22.
256 · Data::Dumper has been upgraded from version 2.170 to 2.174
258 Data::Dumper now avoids leaking when "croak"ing.
260 · DB_File has been upgraded from version 1.840 to 1.843.
262 · deprecate has been upgraded from version 0.03 to 0.04.
264 · Devel::Peek has been upgraded from version 1.27 to 1.28.
266 · Devel::PPPort has been upgraded from version 3.40 to 3.52.
268 · Digest::SHA has been upgraded from version 6.01 to 6.02.
270 · Encode has been upgraded from version 2.97 to 3.01.
272 · Errno has been upgraded from version 1.29 to 1.30.
274 · experimental has been upgraded from version 0.019 to 0.020.
276 · ExtUtils::CBuilder has been upgraded from version 0.280230 to
278 0.280231.
279 · ExtUtils::Manifest has been upgraded from version 1.70 to 1.72.
281 · ExtUtils::Miniperl has been upgraded from version 1.08 to 1.09.
283 · ExtUtils::ParseXS has been upgraded from version 3.39 to 3.40.
285 "OUTLIST" parameters are no longer incorrectly included in the
286 automatically generated function prototype. [perl #133654]
287 <https://rt.perl.org/Ticket/Display.html?id=133654>.
288 · feature has been upgraded from version 1.52 to 1.54.
290 · File::Copy has been upgraded from version 2.33 to 2.34.
292 · File::Find has been upgraded from version 1.34 to 1.36.
294 $File::Find::dont_use_nlink now defaults to 1 on all platforms.
296 [perl #133673] <https://rt.perl.org/Ticket/Display.html?id=133673>.
297 Variables $Is_Win32 and $Is_VMS are being initialized.
299 · File::Glob has been upgraded from version 1.31 to 1.32.
301 · File::Path has been upgraded from version 2.15 to 2.16.
303 · File::Spec has been upgraded from version 3.74 to 3.78.
305 Silence Cwd warning on Android builds if "targetsh" is not defined.
307 · File::Temp has been upgraded from version 0.2304 to 0.2309.
309 · Filter::Util::Call has been upgraded from version 1.58 to 1.59.
311 · GDBM_File has been upgraded from version 1.17 to 1.18.
313 · HTTP::Tiny has been upgraded from version 0.070 to 0.076.
315 · I18N::Langinfo has been upgraded from version 0.17 to 0.18.
317 · IO has been upgraded from version 1.39 to 1.40.
319 · IO-Compress has been upgraded from version 2.074 to 2.084.
321 Adds support for "IO::Uncompress::Zstd" and
323 "IO::Uncompress::UnLzip".
324 The "BinModeIn" and "BinModeOut" options are now no-ops. ALL files
326 will be read/written in binmode.
327 · IPC::Cmd has been upgraded from version 1.00 to 1.02.
329 · JSON::PP has been upgraded from version 2.97001 to 4.02.
331 JSON::PP as JSON::XS 4.0 enables "allow_nonref" by default.
333 · lib has been upgraded from version 0.64 to 0.65.
335 · Locale::Codes has been upgraded from version 3.56 to 3.57.
337 · Math::BigInt has been upgraded from version 1.999811 to 1.999816.
339 "bnok()" now supports the full Kronenburg extension. [cpan #95628]
341 <https://rt.cpan.org/Ticket/Display.html?id=95628>.
342 · Math::BigInt::FastCalc has been upgraded from version 0.5006 to
344 0.5008.
345 · Math::BigRat has been upgraded from version 0.2613 to 0.2614.
347 · Module::CoreList has been upgraded from version 5.20180622 to
349 5.20190520.
350 Changes to B::Op_private and Config
352 · Module::Load has been upgraded from version 0.32 to 0.34.
354 · Module::Metadata has been upgraded from version 1.000033 to
356 1.000036.
357 Properly clean up temporary directories after testing.
359 · NDBM_File has been upgraded from version 1.14 to 1.15.
361 · Net::Ping has been upgraded from version 2.62 to 2.71.
363 · ODBM_File has been upgraded from version 1.15 to 1.16.
365 · PathTools has been upgraded from version 3.74 to 3.78.
367 · parent has been upgraded from version 0.236 to 0.237.
369 · perl5db.pl has been upgraded from version 1.54 to 1.55.
371 Debugging threaded code no longer deadlocks in "DB::sub" nor
373 "DB::lsub".
374 · perlfaq has been upgraded from version 5.021011 to 5.20190126.
376 · PerlIO::encoding has been upgraded from version 0.26 to 0.27.
378 Warnings enabled by setting the "WARN_ON_ERR" flag in
380 $PerlIO::encoding::fallback are now only produced if warnings are
381 enabled with "use warnings "utf8";" or setting $^W.
382 · PerlIO::scalar has been upgraded from version 0.29 to 0.30.
384 · podlators has been upgraded from version 4.10 to 4.11.
386 · POSIX has been upgraded from version 1.84 to 1.88.
388 · re has been upgraded from version 0.36 to 0.37.
390 · SDBM_File has been upgraded from version 1.14 to 1.15.
392 · sigtrap has been upgraded from version 1.08 to 1.09.
394 · Storable has been upgraded from version 3.08 to 3.15.
396 Storable no longer probes for recursion limits at build time.
398 [perl #133708] <https://rt.perl.org/Ticket/Display.html?id=133708>
399 and others.
400 Metasploit exploit code was included to test for CVE-2015-1992
402 detection, this caused anti-virus detections on at least one AV
403 suite. The exploit code has been removed and replaced with a
404 simple functional test. [perl #133706]
405 <https://rt.perl.org/Ticket/Display.html?id=133706>
406 · Test::Simple has been upgraded from version 1.302133 to 1.302162.
408 · Thread::Queue has been upgraded from version 3.12 to 3.13.
410 · threads::shared has been upgraded from version 1.58 to 1.60.
412 Added support for extra tracing of locking, this requires a
414 "-DDEBUGGING" and extra compilation flags.
415 · Time::HiRes has been upgraded from version 1.9759 to 1.9760.
417 · Time::Local has been upgraded from version 1.25 to 1.28.
419 · Time::Piece has been upgraded from version 1.3204 to 1.33.
421 · Unicode::Collate has been upgraded from version 1.25 to 1.27.
423 · Unicode::UCD has been upgraded from version 0.70 to 0.72.
425 · User::grent has been upgraded from version 1.02 to 1.03.
427 · utf8 has been upgraded from version 1.21 to 1.22.
429 · vars has been upgraded from version 1.04 to 1.05.
431 "vars.pm" no longer disables non-vars strict when checking if
433 strict vars is enabled. [perl #130674]
434 <https://rt.perl.org/Ticket/Display.html?id=130674>.
435 · version has been upgraded from version 0.9923 to 0.9924.
437 · warnings has been upgraded from version 1.42 to 1.44.
439 · XS::APItest has been upgraded from version 0.98 to 1.00.
441 · XS::Typemap has been upgraded from version 0.16 to 0.17.
443 Removed Modules and Pragmata
445 The following modules will be removed from the core distribution in a
446 future release, and will at that time need to be installed from CPAN.
447 Distributions on CPAN which require these modules will need to list
448 them as prerequisites.
449 The core versions of these modules will now issue "deprecated"-category
451 warnings to alert you to this fact. To silence these deprecation
452 warnings, install the modules in question from CPAN.
453 Note that these are (with rare exceptions) fine modules that you are
455 encouraged to continue to use. Their disinclusion from core primarily
456 hinges on their necessity to bootstrapping a fully functional, CPAN-
457 capable Perl installation, not usually on concerns over their design.
458 · B::Debug is no longer distributed with the core distribution. It
460 continues to be available on CPAN as "B::Debug
461 <https://metacpan.org/pod/B::Debug>".
462 · Locale::Codes has been removed at the request of its author. It
464 continues to be available on CPAN as "Locale::Codes
465 <https://metacpan.org/pod/Locale::Codes>" [perl #133458]
466 <https://rt.perl.org/Ticket/Display.html?id=133458>.
467
469 Changes to Existing Documentation
470 We have attempted to update the documentation to reflect the changes
471 listed in this document. If you find any we have missed, send email to
472 perlbug@perl.org <mailto:perlbug@perl.org>.
473 perlapi
475 · "AvFILL()" was wrongly listed as deprecated. This has been
477 corrected. [perl #133278]
478 <https://rt.perl.org/Ticket/Display.html?id=133278>
479 perlop
481 · We no longer have null (empty line) here doc terminators, so perlop
483 should not refer to them.
484 · The behaviour of "tr" when the delimiter is an apostrophe has been
486 clarified. In particular, hyphens aren't special, and "\x{}" isn't
487 interpolated. [perl #130679]
488 <https://rt.perl.org/Ticket/Display.html?id=130679>
489 perlreapi, perlvar
491 · Improve docs for lastparen, lastcloseparen.
493 perlfunc
495 · The entry for "-X" in perlfunc has been clarified to indicate that
497 symbolic links are followed for most tests.
498 · Clarification of behaviour of "reset EXPR".
500 · Try to clarify that "ref(qr/xx/)" returns "Regexp" rather than
502 "REGEXP" and why. [perl #133751]
503 <https://rt.perl.org/Ticket/Display.html?id=133751>.
504 perlreref
506 · Clarification of the syntax of /(?(cond)yes)/.
508 perllocale
510 · There are actually two slightly different types of UTF-8 locales:
512 one for Turkic languages and one for everything else. Starting in
513 Perl v5.30, Perl seamlessly handles both types.
514 perlrecharclass
516 · Added a note for the ::xdigit:: character class.
518 perlvar
520 · More specific documentation of paragraph mode. [perl #133722]
522 <https://rt.perl.org/Ticket/Display.html?id=133722>.
523
525 The following additions or changes have been made to diagnostic output,
526 including warnings and fatal error messages. For the complete list of
527 diagnostic messages, see perldiag.
528 Changes to Existing Diagnostics
530 · As noted under "Incompatible Changes" above, the deprecation
531 warning "Unescaped left brace in regex is deprecated here (and will
532 be fatal in Perl 5.30), passed through in regex; marked by <-- HERE
533 in m/%s/" has been changed to the non-deprecation warning
534 "Unescaped left brace in regex is passed through in regex; marked
535 by <-- HERE in m/%s/".
536 · Specifying "\o{}" without anything between the braces now yields
538 the fatal error message "Empty \o{}". Previously it was "Number
539 with no digits". This means the same wording is used for this kind
540 of error as with similar constructs such as "\p{}".
541 · Within the scope of the experimental feature "use re 'strict'",
543 specifying "\x{}" without anything between the braces now yields
544 the fatal error message "Empty \x{}". Previously it was "Number
545 with no digits". This means the same wording is used for this kind
546 of error as with similar constructs such as "\p{}". It is legal,
547 though not wise to have an empty "\x" outside of "re 'strict'"; it
548 silently generates a NUL character.
549 · Type of arg %d to %s must be %s (not %s)
551 Attempts to push, pop, etc on a hash or glob now produce this
553 message rather than complaining that they no longer work on
554 scalars. [perl #130367]
555 <https://rt.perl.org/Ticket/Display.html?id=130367>.
556 · Prototype not terminated
558 The file and line number is now reported for this error. [perl
560 #133524] <https://rt.perl.org/Ticket/Display.html?id=133524>
561 · Under "-Dr" (or "use re 'Debug'") the compiled regex engine program
563 is displayed. It used to use two different spellings for infinity,
564 "INFINITY", and "INFTY". It now uses the latter exclusively, as
565 that spelling has been around the longest.
566
568 xsubpp
569 · The generated prototype (with "PROTOTYPES: ENABLE") would include
570 "OUTLIST" parameters, but these aren't arguments to the perl
571 function. This has been rectified. [perl #133654]
572 <https://rt.perl.org/Ticket/Display.html?id=133654>.
573
575 · Normally the thread-safe locale functions are used only on threaded
576 builds. It is now possible to force their use on unthreaded builds
577 on systems that have them available, by including the
578 "-Accflags='-DUSE_THREAD_SAFE_LOCALE'" option to Configure.
579 · Improve detection of memrchr, strlcat, and strlcpy
581 · Improve Configure detection of memmem(). [perl #133760]
583 <https://rt.perl.org/Ticket/Display.html?id=133760>.
584 · Multiple improvements and fixes for -DPERL_GLOBAL_STRUCT build
586 option.
587 · Fix -DPERL_GLOBAL_STRUCT_PRIVATE build option.
589
591 · t/lib/croak/op [perl #130367]
592 <https://rt.perl.org/Ticket/Display.html?id=130367>.
593 separate error for "push", etc. on hash/glob.
595 · t/op/svleak.t [perl #133660]
597 <https://rt.perl.org/Ticket/Display.html?id=133660>.
598 Add test for "goto &sub" in overload leaking.
600 · Split t/re/fold_grind.t into multiple test files.
602 · Fix intermittent tests which failed due to race conditions which
604 surface during parallel testing. [perl #133740]
605 <https://rt.perl.org/Ticket/Display.html?id=133740>.
606 · Thoroughly test paragraph mode, using a new test file,
608 t/io/paragraph_mode.t. [perl #133722]
609 <https://rt.perl.org/Ticket/Display.html?id=133722>.
610 · Some tests in t/io/eintr.t caused the process to hang on pre-16
612 Darwin. These tests are skipped for those version of Darwin.
613
615 Platform-Specific Notes
616 HP-UX 11.11
617 An obscure problem in "pack()" when compiling with HP C-ANSI-C has
618 been fixed by disabling optimizations in pp_pack.c.
619 Mac OS X
621 Perl's build and testing process on Mac OS X for "-Duseshrplib"
622 builds is now compatible with Mac OS X System Integrity Protection
623 (SIP).
624 SIP prevents binaries in /bin (and a few other places) being passed
626 the "DYLD_LIBRARY_PATH" environment variable. For our purposes
627 this prevents "DYLD_LIBRARY_PATH" from being passed to the shell,
628 which prevents that variable being passed to the testing or build
629 process, so running "perl" couldn't find libperl.dylib.
630 To work around that, the initial build of the perl executable
632 expects to find libperl.dylib in the build directory, and the
633 library path is then adjusted during installation to point to the
634 installed library.
635 [perl #126706] <https://rt.perl.org/Ticket/Display.html?id=126706>.
637 Minix3
639 Some support for Minix3 has been re-added.
640 Cygwin
642 Cygwin doesn't make "cuserid" visible.
643 Win32 Mingw
645 C99 math functions are now available.
646 Windows
648 · The "USE_CPLUSPLUS" build option which has long been available
649 in win32/Makefile (for nmake) and win32/makefile.mk (for dmake)
650 is now also available in win32/GNUmakefile (for gmake).
651 · The nmake makefile no longer defaults to Visual C++ 6.0 (a very
653 old version which is unlikely to be widely used today). As a
654 result, it is now a requirement to specify the "CCTYPE" since
655 there is no obvious choice of which modern version to default
656 to instead. Failure to specify "CCTYPE" will result in an
657 error being output and the build will stop.
658 (The dmake and gmake makefiles will automatically detect which
660 compiler is being used, so do not require "CCTYPE" to be set.
661 This feature has not yet been added to the nmake makefile.)
662 · "sleep()" with warnings enabled for a "USE_IMP_SYS" build no
664 longer warns about the sleep timeout being too large. [perl
665 #133376] <https://rt.perl.org/Ticket/Display.html?id=133376>.
666 · Support for compiling perl on Windows using Microsoft Visual
668 Studio 2019 (containing Visual C++ 14.2) has been added.
669 · socket() now sets $! if the protocol, address family and socket
671 type combination is not found. [perl #133853]
672 <https://rt.perl.org/Ticket/Display.html?id=133853>.
673 · The Windows Server 2003 SP1 Platform SDK build, with its early
675 x64 compiler and tools, was accidentally broken in Perl 5.27.9.
676 This has now been fixed.
677
679 · The sizing pass has been eliminated from the regular expression
680 compiler. An extra pass may instead be needed in some cases to
681 count the number of parenthetical capture groups.
682 · A new function ""my_strtod"" in perlapi or its synonym, Strtod(),
684 is now available with the same signature as the libc strtod(). It
685 provides strotod() equivalent behavior on all platforms, using the
686 best available precision, depending on platform capabilities and
687 Configure options, while handling locale-related issues, such as if
688 the radix character should be a dot or comma.
689 · Added "newSVsv_nomg()" to copy a SV without processing get magic on
691 the source. [perl #132964]
692 <https://rt.perl.org/Ticket/Display.html?id=132964>.
693 · It is now forbidden to malloc more than "PTRDIFF_T_MAX" bytes.
695 Much code (including C optimizers) assumes that all data structures
696 will not be larger than this, so this catches such attempts before
697 overflow happens.
698 · Two new regnodes have been introduced "EXACT_ONLY8", and
700 "EXACTFU_ONLY8". They're equivalent to "EXACT" and "EXACTFU",
701 except that they contain a code point which requires UTF-8 to
702 represent/match. Hence, if the target string isn't UTF-8, we know
703 it can't possibly match, without needing to try.
704 · "print_bytes_for_locale()" is now defined if "DEBUGGING", Prior, it
706 didn't get defined unless "LC_COLLATE" was defined on the platform.
707
709 · Compilation under "-DPERL_MEM_LOG" and "-DNO_LOCALE" have been
710 fixed.
711 · Perl 5.28 introduced an "index()" optimization when comparing to -1
713 (or indirectly, e.g. >= 0). When this optimization was triggered
714 inside a "when" clause it caused a warning ("Argument %s isn't
715 numeric in smart match"). This has now been fixed. [perl #133368]
716 <https://rt.perl.org/Ticket/Display.html?id=133368>
717 · The new in-place editing code no longer leaks directory handles.
719 [perl #133314] <https://rt.perl.org/Ticket/Display.html?id=133314>.
720 · Warnings produced from constant folding operations on overloaded
722 values no longer produce spurious "Use of uninitialized value"
723 warnings. [perl #132683]
724 <https://rt.perl.org/Ticket/Display.html?id=132683>.
725 · Fix for "mutator not seen in (lex = ...) .= ..." [perl #133441]
727 <https://rt.perl.org/Ticket/Display.html?id=133441>.
728 · "pack "u", "invalid uuencoding"" now properly NUL terminates the
730 zero-length SV produced. [perl #132655]
731 <https://rt.perl.org/Ticket/Display.html?id=132655>.
732 · Improve the debugging output for calloc() calls with "-Dm". [perl
734 #133439] <https://rt.perl.org/Ticket/Display.html?id=133439>.
735 · Regexp script runs were failing to permit ASCII digits in some
737 cases. [perl #133547]
738 <https://rt.perl.org/Ticket/Display.html?id=133547>.
739 · On Unix-like systems supporting a platform-specific technique for
741 determining $^X, Perl failed to fall back to the generic technique
742 when the platform-specific one fails (for example, a Linux system
743 with /proc not mounted). This was a regression in Perl 5.28.0.
744 [perl #133573] <https://rt.perl.org/Ticket/Display.html?id=133573>.
745 · SDBM_File is now more robust with corrupt database files. The
747 improvements do not make SDBM files suitable as an interchange
748 format. [perl #132147]
749 <https://rt.perl.org/Ticket/Display.html?id=132147>.
750 · "binmode($fh);" or "binmode($fh, ':raw');" now properly removes the
752 ":utf8" flag from the default ":crlf" I/O layer on Win32. [perl
753 #133604] <https://rt.perl.org/Ticket/Display.html?id=133604>.
754 · The experimental reference aliasing feature was misinterpreting
756 array and hash slice assignment as being localised, e.g.
757 \(@a[3,5,7]) = \(....);
759 was being interpreted as:
761 local \(@a[3,5,7]) = \(....);
763 [perl #133538] <https://rt.perl.org/Ticket/Display.html?id=133538>.
765 · "sort SUBNAME" within an "eval EXPR" when "EXPR" was UTF-8 upgraded
767 could panic if the "SUBNAME" was non-ASCII. [perl #134061]
768 <https://rt.perl.org/Ticket/Display.html?id=134061>.
769 · Correctly handle realloc() modifying "errno" on success so that the
771 modification isn't visible to the perl user, since realloc() is
772 called implicitly by the interpreter. This modification is
773 permitted by the C standard, but has only been observed on FreeBSD
774 13.0-CURRENT. [perl #133958]
775 <https://rt.perl.org/Ticket/Display.html?id=133958>.
776 · Perl now exposes POSIX "getcwd" as "Internals::getcwd()" if
778 available. This is intended for use by "Cwd.pm" during
779 bootstrapping and may be removed or changed without notice. This
780 fixes some bootstrapping issues while building perl in a directory
781 where some ancestor directory isn't readable. [perl #133951]
782 <https://rt.perl.org/Ticket/Display.html?id=133951>.
783 · "pack()" no longer can return malformed UTF-8. It croaks if it
785 would otherwise return a UTF-8 string that contains malformed
786 UTF-8. This protects against potential security threats. [perl
787 #131642] <https://rt.perl.org/Ticket/Display.html?id=131642>.
788 · See "Any set of digits in the Common script are legal in a script
790 run of another script".
791 · Regular expression matching no longer leaves stale UTF-8 length
793 magic when updating $^R. This could result in "length($^R)"
794 returning an incorrect value.
795 · Reduce recursion on ops [perl #108276]
797 <https://rt.perl.org/Ticket/Display.html?id=108276>.
798 This can prevent stack overflow when processing extremely deep op
800 trees.
801 · Avoid leak in multiconcat with overloading. [perl #133789]
803 <https://rt.perl.org/Ticket/Display.html?id=133789>.
804 · The handling of user-defined "\p{}" properties (see "User-Defined
806 Character Properties" in perlunicode) has been rewritten to be in C
807 (instead of Perl). This speeds things up, but in the process
808 several inconsistencies and bug fixes are made.
809 1. A few error messages have minor wording changes. This is
811 essentially because the new way is integrated into the regex
812 error handling mechanism that marks the position in the input
813 at which the error occurred. That was not possible previously.
814 The messages now also contain additional back-trace-like
815 information in case the error occurs deep in nested calls.
816 2. A user-defined property is implemented as a perl subroutine
818 with certain highly constrained naming conventions. It was
819 documented previously that the sub would be in the current
820 package if the package was unspecified. This turned out not to
821 be true in all cases, but now it is.
822 3. All recursive calls are treated as infinite recursion.
824 Previously they would cause the interpreter to panic. Now,
825 they cause the regex pattern to fail to compile.
826 4. Similarly, any other error likely would lead to a panic; now to
828 just the pattern failing to compile.
829 5. The old mechanism did not detect illegal ranges in the
831 definition of the property. Now, the range max must not be
832 smaller than the range min. Otherwise, the pattern fails to
833 compile.
834 6. The intention was to have each sub called only once during the
836 lifetime of the program, so that a property's definition is
837 immutable. This was relaxed so that it could be called once
838 for all /i compilations, and potentially a second time for
839 non-/i (the sub is passed a parameter indicating which).
840 However, in practice there were instances when this was broken,
841 and multiple calls were possible. Those have been fixed. Now
842 (besides the /i,non-/i cases) the only way a sub can be called
843 multiple times is if some component of it has not been defined
844 yet. For example, suppose we have sub IsA() whose definition
845 is known at compile time, and it in turn calls isB() whose
846 definition is not yet known. isA() will be called each time a
847 pattern it appears in is compiled. If isA() also calls isC()
848 and that definition is known, isC() will be called just once.
849 7. There were some races and very long hangs should one thread be
851 compiling the same property as another simultaneously. These
852 have now been fixed.
853 · Fixed a failure to match properly.
855 An EXACTFish regnode has a finite length it can hold for the string
857 being matched. If that length is exceeded, a second node is used
858 for the next segment of the string, for as many regnodes as are
859 needed. Care has to be taken where to break the string, in order
860 to deal multi-character folds in Unicode correctly. If we want to
861 break a string at a place which could potentially be in the middle
862 of a multi-character fold, we back off one (or more) characters,
863 leaving a shorter EXACTFish regnode. This backing off mechanism
864 contained an off-by-one error. [perl #133756]
865 <https://rt.perl.org/Ticket/Display.html?id=133756>.
866 · A bare "eof" call with no previous file handle now returns true.
868 [perl #133721] <https://rt.perl.org/Ticket/Display.html?id=133721>
869 · Failing to compile a format now aborts compilation. Like other
871 errors in sub-parses this could leave the parser in a strange
872 state, possibly crashing perl if compilation continued. [perl
873 #132158] <https://rt.perl.org/Ticket/Display.html?id=132158>
874 · If an in-place edit is still in progress during global destruction
876 and the process exit code (as stored in $?) is zero, perl will now
877 treat the in-place edit as successful, replacing the input file
878 with any output produced.
879 This allows code like:
881 perl -i -ne 'print "Foo"; last'
883 to replace the input file, while code like:
885 perl -i -ne 'print "Foo"; die'
887 will not. Partly resolves [perl #133659]
889 <https://rt.perl.org/Ticket/Display.html?id=133659>.
890 · A regression in 5.28 caused the following code to fail
892 close(STDIN); open(CHILD, "|wc -l")'
894 because the child's stdin would be closed on exec. This has now
896 been fixed.
897 · Fixed an issue where compiling a regexp containing both compile-
899 time and run-time code blocks could lead to trying to compile
900 something which is invalid syntax.
901 · Fixed build failures with "-DNO_LOCALE_NUMERIC" and
903 "-DNO_LOCALE_COLLATE". [perl #133696]
904 <https://rt.perl.org/Ticket/Display.html?id=133696>.
905 · Prevent the tests in ext/B/t/strict.t from being skipped. [perl
907 #133713] <https://rt.perl.org/Ticket/Display.html?id=133713>.
908 · "/di" nodes ending or beginning in s are now "EXACTF". We do not
910 want two "EXACTFU" to be joined together during optimization, and
911 to form a "ss", "sS", "Ss" or "SS" sequence; they are the only
912 multi-character sequences which may match differently under "/ui"
913 and "/di".
914
916 Perl 5.30.0 represents approximately 11 months of development since
917 Perl 5.28.0 and contains approximately 620,000 lines of changes across
918 1,300 files from 58 authors.
919 Excluding auto-generated files, documentation and release tools, there
921 were approximately 510,000 lines of changes to 750 .pm, .t, .c and .h
922 files.
923 Perl continues to flourish into its fourth decade thanks to a vibrant
925 community of users and developers. The following people are known to
926 have contributed the improvements that became Perl 5.30.0:
927 Aaron Crane, Abigail, Alberto Simo~es, Alexandr Savca, Andreas Koenig,
929 Andy Dougherty, Aristotle Pagaltzis, Brian Greenfield, Chad Granum,
930 Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsaaker, Dan
931 Book, Dan Dedrick, Daniel Dragan, Dan Kogai, David Cantrell, David
932 Mitchell, Dominic Hargreaves, E. Choroba, Ed J, Eugen Konkov, Francois
933 Perrad, Graham Knop, Hauke D, H.Merijn Brand, Hugo van der Sanden,
934 Jakub Wilk, James Clarke, James E Keenan, Jerry D. Hedden, Jim Cromie,
935 John SJ Anderson, Karen Etheridge, Karl Williamson, Leon Timmermans,
936 Matthias Bethke, Nicholas Clark, Nicolas R., Niko Tyni, Pali, Petr
937 PisaX, Phil Pearl (Lobbes), Richard Leach, Ryan Voots, Sawyer X, Shlomi
938 Fish, Sisyphus, Slaven Rezic, Steve Hay, Sullivan Beck, Tina Mueller,
939 Tomasz Konojacki, Tom Wyant, Tony Cook, Unicode Consortium, Yves Orton,
940 Zak B. Elep.
941 The list above is almost certainly incomplete as it is automatically
943 generated from version control history. In particular, it does not
944 include the names of most of the (very much appreciated) contributors
945 who reported issues to the Perl bug tracker. Noteworthy in this release
946 were the large number of bug fixes made possible by Sergey Aleynikov's
947 high quality perlbug reports for issues he discovered by fuzzing with
948 AFL.
949 Many of the changes included in this version originated in the CPAN
951 modules included in Perl's core. We're grateful to the entire CPAN
952 community for helping Perl to flourish.
953 For a more complete list of all of Perl's historical contributors,
955 please see the AUTHORS file in the Perl source distribution.
956
958 If you find what you think is a bug, you might check the perl bug
959 database at <https://rt.perl.org/>. There may also be information at
960 <http://www.perl.org/>, the Perl Home Page.
961 If you believe you have an unreported bug, please run the perlbug
963 program included with your release. Be sure to trim your bug down to a
964 tiny but sufficient test case. Your bug report, along with the output
965 of "perl -V", will be sent off to perlbug@perl.org to be analysed by
966 the Perl porting team.
967 If the bug you are reporting has security implications which make it
969 inappropriate to send to a publicly archived mailing list, then see
970 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
971 how to report the issue.
972
974 If you wish to thank the Perl 5 Porters for the work we had done in
975 Perl 5, you can do so by running the "perlthanks" program:
976 perlthanks
978 This will send an email to the Perl 5 Porters list with your show of
980 thanks.
981
983 The Changes file for an explanation of how to view exhaustive details
984 on what changed.
985 The INSTALL file for how to build Perl.
987 The README file for general stuff.
989 The Artistic and Copying files for copyright information.
991perl v5.32.1 2021-03-31 PERL5300DELTA(1)