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. [GH
17 #16822] <https://github.com/Perl/perl5/issues/16822>.
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 layers,
131 such as compression are completely ignored with or without the
132 ":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 [GH #14839] <https://github.com/Perl/perl5/issues/14839>.
139 my() in false conditional prohibited
141 Declarations such as "my $x if 0" are no longer permitted.
142 [GH #16702] <https://github.com/Perl/perl5/issues/16702>.
144 Fatalize $* and $#
146 These special variables, long deprecated, now throw exceptions when
147 used.
148 [GH #16718] <https://github.com/Perl/perl5/issues/16718>.
150 Fatalize unqualified use of dump()
152 The dump() function, long discouraged, may no longer be used unless it
153 is fully qualified, i.e., CORE::dump().
154 [GH #16719] <https://github.com/Perl/perl5/issues/16719>.
156 Remove File::Glob::glob()
158 The File::Glob::glob() function, long deprecated, has been removed and
159 now throws an exception which advises use of File::Glob::bsd_glob()
160 instead.
161 [GH #16721] <https://github.com/Perl/perl5/issues/16721>.
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. [GH #16035]
168 <https://github.com/Perl/perl5/issues/16035>.
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. [GH #16704]
180 <https://github.com/Perl/perl5/issues/16704>.
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 instructions
198 than before. The performance of checking that a sequence of bytes
199 is valid UTF-8 is similarly improved, again by using a DFA.
200 • Eliminate recursion from finalize_op(). [GH #11866]
202 <https://github.com/Perl/perl5/issues/11866>.
203 • A handful of small optimizations related to character folding and
205 character classes in regular expressions.
206 • Optimization of "IV" to "UV" conversions. [GH #16761]
208 <https://github.com/Perl/perl5/issues/16761>.
209 • Speed up of the integer stringification algorithm by processing two
211 digits at a time instead of one. [GH #16769]
212 <https://github.com/Perl/perl5/issues/16769>.
213 • Improvements based on LGTM analysis and recommendation.
215 (<https://lgtm.com/projects/g/Perl/perl5/alerts/?mode=tree>). [GH
216 #16765] <https://github.com/Perl/perl5/issues/16765>. [GH #16773]
217 <https://github.com/Perl/perl5/issues/16773>.
218 • Code optimizations in regcomp.c, regcomp.h, regexec.c.
220 • Regular expression pattern matching of things like "qr/[^a]/" is
222 significantly sped up, where a is any ASCII character. Other
223 classes can get this speed up, but which ones is complicated and
224 depends on the underlying bit patterns of those characters, so
225 differs between ASCII and EBCDIC platforms, but all case pairs,
226 like "qr/[Gg]/" are included, as is "[^01]".
227
229 Updated Modules and Pragmata
230 • Archive::Tar has been upgraded from version 2.30 to 2.32.
231 • B has been upgraded from version 1.74 to 1.76.
233 • B::Concise has been upgraded from version 1.003 to 1.004.
235 • B::Deparse has been upgraded from version 1.48 to 1.49.
237 • bignum has been upgraded from version 0.49 to 0.51.
239 • bytes has been upgraded from version 1.06 to 1.07.
241 • Carp has been upgraded from version 1.38 to 1.50
243 • Compress::Raw::Bzip2 has been upgraded from version 2.074 to 2.084.
245 • Compress::Raw::Zlib has been upgraded from version 2.076 to 2.084.
247 • Config::Extensions has been upgraded from version 0.02 to 0.03.
249 • Config::Perl::V. has been upgraded from version 0.29 to 0.32. This
251 was due to a new configuration variable that has influence on
252 binary compatibility: "USE_THREAD_SAFE_LOCALE".
253 • CPAN has been upgraded from version 2.20 to 2.22.
255 • Data::Dumper has been upgraded from version 2.170 to 2.174
257 Data::Dumper now avoids leaking when "croak"ing.
259 • DB_File has been upgraded from version 1.840 to 1.843.
261 • deprecate has been upgraded from version 0.03 to 0.04.
263 • Devel::Peek has been upgraded from version 1.27 to 1.28.
265 • Devel::PPPort has been upgraded from version 3.40 to 3.52.
267 • Digest::SHA has been upgraded from version 6.01 to 6.02.
269 • Encode has been upgraded from version 2.97 to 3.01.
271 • Errno has been upgraded from version 1.29 to 1.30.
273 • experimental has been upgraded from version 0.019 to 0.020.
275 • ExtUtils::CBuilder has been upgraded from version 0.280230 to
277 0.280231.
278 • ExtUtils::Manifest has been upgraded from version 1.70 to 1.72.
280 • ExtUtils::Miniperl has been upgraded from version 1.08 to 1.09.
282 • ExtUtils::ParseXS has been upgraded from version 3.39 to 3.40.
284 "OUTLIST" parameters are no longer incorrectly included in the
285 automatically generated function prototype. [GH #16746]
286 <https://github.com/Perl/perl5/issues/16746>.
287 • feature has been upgraded from version 1.52 to 1.54.
289 • File::Copy has been upgraded from version 2.33 to 2.34.
291 • File::Find has been upgraded from version 1.34 to 1.36.
293 $File::Find::dont_use_nlink now defaults to 1 on all platforms.
295 [GH #16759] <https://github.com/Perl/perl5/issues/16759>.
296 Variables $Is_Win32 and $Is_VMS are being initialized.
298 • File::Glob has been upgraded from version 1.31 to 1.32.
300 • File::Path has been upgraded from version 2.15 to 2.16.
302 • File::Spec has been upgraded from version 3.74 to 3.78.
304 Silence Cwd warning on Android builds if "targetsh" is not defined.
306 • File::Temp has been upgraded from version 0.2304 to 0.2309.
308 • Filter::Util::Call has been upgraded from version 1.58 to 1.59.
310 • GDBM_File has been upgraded from version 1.17 to 1.18.
312 • HTTP::Tiny has been upgraded from version 0.070 to 0.076.
314 • I18N::Langinfo has been upgraded from version 0.17 to 0.18.
316 • IO has been upgraded from version 1.39 to 1.40.
318 • IO-Compress has been upgraded from version 2.074 to 2.084.
320 Adds support for "IO::Uncompress::Zstd" and
322 "IO::Uncompress::UnLzip".
323 The "BinModeIn" and "BinModeOut" options are now no-ops. ALL files
325 will be read/written in binmode.
326 • IPC::Cmd has been upgraded from version 1.00 to 1.02.
328 • JSON::PP has been upgraded from version 2.97001 to 4.02.
330 JSON::PP as JSON::XS 4.0 enables "allow_nonref" by default.
332 • lib has been upgraded from version 0.64 to 0.65.
334 • Locale::Codes has been upgraded from version 3.56 to 3.57.
336 • Math::BigInt has been upgraded from version 1.999811 to 1.999816.
338 bnok() now supports the full Kronenburg extension. [cpan #95628]
340 <https://rt.cpan.org/Ticket/Display.html?id=95628>.
341 • Math::BigInt::FastCalc has been upgraded from version 0.5006 to
343 0.5008.
344 • Math::BigRat has been upgraded from version 0.2613 to 0.2614.
346 • Module::CoreList has been upgraded from version 5.20180622 to
348 5.20190520.
349 Changes to B::Op_private and Config
351 • Module::Load has been upgraded from version 0.32 to 0.34.
353 • Module::Metadata has been upgraded from version 1.000033 to
355 1.000036.
356 Properly clean up temporary directories after testing.
358 • NDBM_File has been upgraded from version 1.14 to 1.15.
360 • Net::Ping has been upgraded from version 2.62 to 2.71.
362 • ODBM_File has been upgraded from version 1.15 to 1.16.
364 • PathTools has been upgraded from version 3.74 to 3.78.
366 • parent has been upgraded from version 0.236 to 0.237.
368 • perl5db.pl has been upgraded from version 1.54 to 1.55.
370 Debugging threaded code no longer deadlocks in "DB::sub" nor
372 "DB::lsub".
373 • perlfaq has been upgraded from version 5.021011 to 5.20190126.
375 • PerlIO::encoding has been upgraded from version 0.26 to 0.27.
377 Warnings enabled by setting the "WARN_ON_ERR" flag in
379 $PerlIO::encoding::fallback are now only produced if warnings are
380 enabled with "use warnings "utf8";" or setting $^W.
381 • PerlIO::scalar has been upgraded from version 0.29 to 0.30.
383 • podlators has been upgraded from version 4.10 to 4.11.
385 • POSIX has been upgraded from version 1.84 to 1.88.
387 • re has been upgraded from version 0.36 to 0.37.
389 • SDBM_File has been upgraded from version 1.14 to 1.15.
391 • sigtrap has been upgraded from version 1.08 to 1.09.
393 • Storable has been upgraded from version 3.08 to 3.15.
395 Storable no longer probes for recursion limits at build time. [GH
397 #16780] <https://github.com/Perl/perl5/issues/16780> and others.
398 Metasploit exploit code was included to test for CVE-2015-1592
400 detection, this caused anti-virus detections on at least one AV
401 suite. The exploit code has been removed and replaced with a
402 simple functional test. [GH #16778]
403 <https://github.com/Perl/perl5/issues/16778>
404 • Test::Simple has been upgraded from version 1.302133 to 1.302162.
406 • Thread::Queue has been upgraded from version 3.12 to 3.13.
408 • threads::shared has been upgraded from version 1.58 to 1.60.
410 Added support for extra tracing of locking, this requires a
412 "-DDEBUGGING" and extra compilation flags.
413 • Time::HiRes has been upgraded from version 1.9759 to 1.9760.
415 • Time::Local has been upgraded from version 1.25 to 1.28.
417 • Time::Piece has been upgraded from version 1.3204 to 1.33.
419 • Unicode::Collate has been upgraded from version 1.25 to 1.27.
421 • Unicode::UCD has been upgraded from version 0.70 to 0.72.
423 • User::grent has been upgraded from version 1.02 to 1.03.
425 • utf8 has been upgraded from version 1.21 to 1.22.
427 • vars has been upgraded from version 1.04 to 1.05.
429 "vars.pm" no longer disables non-vars strict when checking if
431 strict vars is enabled. [GH #15851]
432 <https://github.com/Perl/perl5/issues/15851>.
433 • version has been upgraded from version 0.9923 to 0.9924.
435 • warnings has been upgraded from version 1.42 to 1.44.
437 • XS::APItest has been upgraded from version 0.98 to 1.00.
439 • XS::Typemap has been upgraded from version 0.16 to 0.17.
441 Removed Modules and Pragmata
443 The following modules will be removed from the core distribution in a
444 future release, and will at that time need to be installed from CPAN.
445 Distributions on CPAN which require these modules will need to list
446 them as prerequisites.
447 The core versions of these modules will now issue "deprecated"-category
449 warnings to alert you to this fact. To silence these deprecation
450 warnings, install the modules in question from CPAN.
451 Note that these are (with rare exceptions) fine modules that you are
453 encouraged to continue to use. Their disinclusion from core primarily
454 hinges on their necessity to bootstrapping a fully functional, CPAN-
455 capable Perl installation, not usually on concerns over their design.
456 • B::Debug is no longer distributed with the core distribution. It
458 continues to be available on CPAN as "B::Debug
459 <https://metacpan.org/pod/B::Debug>".
460 • Locale::Codes has been removed at the request of its author. It
462 continues to be available on CPAN as "Locale::Codes
463 <https://metacpan.org/pod/Locale::Codes>" [GH #16660]
464 <https://github.com/Perl/perl5/issues/16660>.
465
467 Changes to Existing Documentation
468 We have attempted to update the documentation to reflect the changes
469 listed in this document. If you find any we have missed, send email to
470 perlbug@perl.org <mailto:perlbug@perl.org>.
471 perlapi
473 • AvFILL() was wrongly listed as deprecated. This has been
475 corrected. [GH #16586]
476 <https://github.com/Perl/perl5/issues/16586>
477 perlop
479 • We no longer have null (empty line) here doc terminators, so perlop
481 should not refer to them.
482 • The behaviour of "tr" when the delimiter is an apostrophe has been
484 clarified. In particular, hyphens aren't special, and "\x{}" isn't
485 interpolated. [GH #15853]
486 <https://github.com/Perl/perl5/issues/15853>
487 perlreapi, perlvar
489 • Improve docs for lastparen, lastcloseparen.
491 perlfunc
493 • The entry for "-X" in perlfunc has been clarified to indicate that
495 symbolic links are followed for most tests.
496 • Clarification of behaviour of "reset EXPR".
498 • Try to clarify that ref(qr/xx/) returns "Regexp" rather than
500 "REGEXP" and why. [GH #16801]
501 <https://github.com/Perl/perl5/issues/16801>.
502 perlreref
504 • Clarification of the syntax of /(?(cond)yes)/.
506 perllocale
508 • There are actually two slightly different types of UTF-8 locales:
510 one for Turkic languages and one for everything else. Starting in
511 Perl v5.30, Perl seamlessly handles both types.
512 perlrecharclass
514 • Added a note for the ::xdigit:: character class.
516 perlvar
518 • More specific documentation of paragraph mode. [GH #16787]
520 <https://github.com/Perl/perl5/issues/16787>.
521
523 The following additions or changes have been made to diagnostic output,
524 including warnings and fatal error messages. For the complete list of
525 diagnostic messages, see perldiag.
526 Changes to Existing Diagnostics
528 • As noted under "Incompatible Changes" above, the deprecation
529 warning "Unescaped left brace in regex is deprecated here (and will
530 be fatal in Perl 5.30), passed through in regex; marked by <-- HERE
531 in m/%s/" has been changed to the non-deprecation warning
532 "Unescaped left brace in regex is passed through in regex; marked
533 by <-- HERE in m/%s/".
534 • Specifying "\o{}" without anything between the braces now yields
536 the fatal error message "Empty \o{}". Previously it was "Number
537 with no digits". This means the same wording is used for this kind
538 of error as with similar constructs such as "\p{}".
539 • Within the scope of the experimental feature "use re 'strict'",
541 specifying "\x{}" without anything between the braces now yields
542 the fatal error message "Empty \x{}". Previously it was "Number
543 with no digits". This means the same wording is used for this kind
544 of error as with similar constructs such as "\p{}". It is legal,
545 though not wise to have an empty "\x" outside of "re 'strict'"; it
546 silently generates a NUL character.
547 • Type of arg %d to %s must be %s (not %s)
549 Attempts to push, pop, etc on a hash or glob now produce this
551 message rather than complaining that they no longer work on
552 scalars. [GH #15774] <https://github.com/Perl/perl5/issues/15774>.
553 • Prototype not terminated
555 The file and line number is now reported for this error. [GH
557 #16697] <https://github.com/Perl/perl5/issues/16697>
558 • Under "-Dr" (or "use re 'Debug'") the compiled regex engine program
560 is displayed. It used to use two different spellings for infinity,
561 "INFINITY", and "INFTY". It now uses the latter exclusively, as
562 that spelling has been around the longest.
563
565 xsubpp
566 • The generated prototype (with "PROTOTYPES: ENABLE") would include
567 "OUTLIST" parameters, but these aren't arguments to the perl
568 function. This has been rectified. [GH #16746]
569 <https://github.com/Perl/perl5/issues/16746>.
570
572 • Normally the thread-safe locale functions are used only on threaded
573 builds. It is now possible to force their use on unthreaded builds
574 on systems that have them available, by including the
575 "-Accflags='-DUSE_THREAD_SAFE_LOCALE'" option to Configure.
576 • Improve detection of memrchr, strlcat, and strlcpy
578 • Improve Configure detection of memmem(). [GH #16807]
580 <https://github.com/Perl/perl5/issues/16807>.
581 • Multiple improvements and fixes for -DPERL_GLOBAL_STRUCT build
583 option.
584 • Fix -DPERL_GLOBAL_STRUCT_PRIVATE build option.
586
588 • t/lib/croak/op [GH #15774]
589 <https://github.com/Perl/perl5/issues/15774>.
590 separate error for "push", etc. on hash/glob.
592 • t/op/svleak.t [GH #16749]
594 <https://github.com/Perl/perl5/issues/16749>.
595 Add test for "goto &sub" in overload leaking.
597 • Split t/re/fold_grind.t into multiple test files.
599 • Fix intermittent tests which failed due to race conditions which
601 surface during parallel testing. [GH #16795]
602 <https://github.com/Perl/perl5/issues/16795>.
603 • Thoroughly test paragraph mode, using a new test file,
605 t/io/paragraph_mode.t. [GH #16787]
606 <https://github.com/Perl/perl5/issues/16787>.
607 • Some tests in t/io/eintr.t caused the process to hang on pre-16
609 Darwin. These tests are skipped for those version of Darwin.
610
612 Platform-Specific Notes
613 HP-UX 11.11
614 An obscure problem in pack() when compiling with HP C-ANSI-C has
615 been fixed by disabling optimizations in pp_pack.c.
616 Mac OS X
618 Perl's build and testing process on Mac OS X for "-Duseshrplib"
619 builds is now compatible with Mac OS X System Integrity Protection
620 (SIP).
621 SIP prevents binaries in /bin (and a few other places) being passed
623 the "DYLD_LIBRARY_PATH" environment variable. For our purposes
624 this prevents "DYLD_LIBRARY_PATH" from being passed to the shell,
625 which prevents that variable being passed to the testing or build
626 process, so running "perl" couldn't find libperl.dylib.
627 To work around that, the initial build of the perl executable
629 expects to find libperl.dylib in the build directory, and the
630 library path is then adjusted during installation to point to the
631 installed library.
632 [GH #15057] <https://github.com/Perl/perl5/issues/15057>.
634 Minix3
636 Some support for Minix3 has been re-added.
637 Cygwin
639 Cygwin doesn't make "cuserid" visible.
640 Win32 Mingw
642 C99 math functions are now available.
643 Windows
645 • The "USE_CPLUSPLUS" build option which has long been available
646 in win32/Makefile (for nmake) and win32/makefile.mk (for dmake)
647 is now also available in win32/GNUmakefile (for gmake).
648 • The nmake makefile no longer defaults to Visual C++ 6.0 (a very
650 old version which is unlikely to be widely used today). As a
651 result, it is now a requirement to specify the "CCTYPE" since
652 there is no obvious choice of which modern version to default
653 to instead. Failure to specify "CCTYPE" will result in an
654 error being output and the build will stop.
655 (The dmake and gmake makefiles will automatically detect which
657 compiler is being used, so do not require "CCTYPE" to be set.
658 This feature has not yet been added to the nmake makefile.)
659 • sleep() with warnings enabled for a "USE_IMP_SYS" build no
661 longer warns about the sleep timeout being too large. [GH
662 #16631] <https://github.com/Perl/perl5/issues/16631>.
663 • Support for compiling perl on Windows using Microsoft Visual
665 Studio 2019 (containing Visual C++ 14.2) has been added.
666 • socket() now sets $! if the protocol, address family and socket
668 type combination is not found. [GH #16849]
669 <https://github.com/Perl/perl5/issues/16849>.
670 • The Windows Server 2003 SP1 Platform SDK build, with its early
672 x64 compiler and tools, was accidentally broken in Perl 5.27.9.
673 This has now been fixed.
674
676 • The sizing pass has been eliminated from the regular expression
677 compiler. An extra pass may instead be needed in some cases to
678 count the number of parenthetical capture groups.
679 • A new function ""my_strtod"" in perlapi or its synonym, Strtod(),
681 is now available with the same signature as the libc strtod(). It
682 provides strotod() equivalent behavior on all platforms, using the
683 best available precision, depending on platform capabilities and
684 Configure options, while handling locale-related issues, such as if
685 the radix character should be a dot or comma.
686 • Added newSVsv_nomg() to copy a SV without processing get magic on
688 the source. [GH #16461]
689 <https://github.com/Perl/perl5/issues/16461>.
690 • It is now forbidden to malloc more than "PTRDIFF_T_MAX" bytes.
692 Much code (including C optimizers) assumes that all data structures
693 will not be larger than this, so this catches such attempts before
694 overflow happens.
695 • Two new regnodes have been introduced "EXACT_ONLY8", and
697 "EXACTFU_ONLY8". They're equivalent to "EXACT" and "EXACTFU",
698 except that they contain a code point which requires UTF-8 to
699 represent/match. Hence, if the target string isn't UTF-8, we know
700 it can't possibly match, without needing to try.
701 • print_bytes_for_locale() is now defined if "DEBUGGING", Prior, it
703 didn't get defined unless "LC_COLLATE" was defined on the platform.
704
706 • Compilation under "-DPERL_MEM_LOG" and "-DNO_LOCALE" have been
707 fixed.
708 • Perl 5.28 introduced an index() optimization when comparing to -1
710 (or indirectly, e.g. >= 0). When this optimization was triggered
711 inside a "when" clause it caused a warning ("Argument %s isn't
712 numeric in smart match"). This has now been fixed. [GH #16626]
713 <https://github.com/Perl/perl5/issues/16626>
714 • The new in-place editing code no longer leaks directory handles.
716 [GH #16602] <https://github.com/Perl/perl5/issues/16602>.
717 • Warnings produced from constant folding operations on overloaded
719 values no longer produce spurious "Use of uninitialized value"
720 warnings. [GH #16349]
721 <https://github.com/Perl/perl5/issues/16349>.
722 • Fix for "mutator not seen in (lex = ...) .= ..." [GH #16655]
724 <https://github.com/Perl/perl5/issues/16655>.
725 • "pack "u", "invalid uuencoding"" now properly NUL terminates the
727 zero-length SV produced. [GH #16343]
728 <https://github.com/Perl/perl5/issues/16343>.
729 • Improve the debugging output for calloc() calls with "-Dm". [GH
731 #16653] <https://github.com/Perl/perl5/issues/16653>.
732 • Regexp script runs were failing to permit ASCII digits in some
734 cases. [GH #16704] <https://github.com/Perl/perl5/issues/16704>.
735 • On Unix-like systems supporting a platform-specific technique for
737 determining $^X, Perl failed to fall back to the generic technique
738 when the platform-specific one fails (for example, a Linux system
739 with /proc not mounted). This was a regression in Perl 5.28.0.
740 [GH #16715] <https://github.com/Perl/perl5/issues/16715>.
741 • SDBM_File is now more robust with corrupt database files. The
743 improvements do not make SDBM files suitable as an interchange
744 format. [GH #16164] <https://github.com/Perl/perl5/issues/16164>.
745 • "binmode($fh);" or "binmode($fh, ':raw');" now properly removes the
747 ":utf8" flag from the default ":crlf" I/O layer on Win32. [GH
748 #16730] <https://github.com/Perl/perl5/issues/16730>.
749 • The experimental reference aliasing feature was misinterpreting
751 array and hash slice assignment as being localised, e.g.
752 \(@a[3,5,7]) = \(....);
754 was being interpreted as:
756 local \(@a[3,5,7]) = \(....);
758 [GH #16701] <https://github.com/Perl/perl5/issues/16701>.
760 • "sort SUBNAME" within an "eval EXPR" when "EXPR" was UTF-8 upgraded
762 could panic if the "SUBNAME" was non-ASCII. [GH #16979]
763 <https://github.com/Perl/perl5/issues/16979>.
764 • Correctly handle realloc() modifying "errno" on success so that the
766 modification isn't visible to the perl user, since realloc() is
767 called implicitly by the interpreter. This modification is
768 permitted by the C standard, but has only been observed on FreeBSD
769 13.0-CURRENT. [GH #16907]
770 <https://github.com/Perl/perl5/issues/16907>.
771 • Perl now exposes POSIX "getcwd" as Internals::getcwd() if
773 available. This is intended for use by "Cwd.pm" during
774 bootstrapping and may be removed or changed without notice. This
775 fixes some bootstrapping issues while building perl in a directory
776 where some ancestor directory isn't readable. [GH #16903]
777 <https://github.com/Perl/perl5/issues/16903>.
778 • pack() no longer can return malformed UTF-8. It croaks if it would
780 otherwise return a UTF-8 string that contains malformed UTF-8.
781 This protects against potential security threats. [GH #16035]
782 <https://github.com/Perl/perl5/issues/16035>.
783 • See "Any set of digits in the Common script are legal in a script
785 run of another script".
786 • Regular expression matching no longer leaves stale UTF-8 length
788 magic when updating $^R. This could result in length($^R) returning
789 an incorrect value.
790 • Reduce recursion on ops [GH #11866]
792 <https://github.com/Perl/perl5/issues/11866>.
793 This can prevent stack overflow when processing extremely deep op
795 trees.
796 • Avoid leak in multiconcat with overloading. [GH #16823]
798 <https://github.com/Perl/perl5/issues/16823>.
799 • The handling of user-defined "\p{}" properties (see "User-Defined
801 Character Properties" in perlunicode) has been rewritten to be in C
802 (instead of Perl). This speeds things up, but in the process
803 several inconsistencies and bug fixes are made.
804 1. A few error messages have minor wording changes. This is
806 essentially because the new way is integrated into the regex
807 error handling mechanism that marks the position in the input
808 at which the error occurred. That was not possible previously.
809 The messages now also contain additional back-trace-like
810 information in case the error occurs deep in nested calls.
811 2. A user-defined property is implemented as a perl subroutine
813 with certain highly constrained naming conventions. It was
814 documented previously that the sub would be in the current
815 package if the package was unspecified. This turned out not to
816 be true in all cases, but now it is.
817 3. All recursive calls are treated as infinite recursion.
819 Previously they would cause the interpreter to panic. Now,
820 they cause the regex pattern to fail to compile.
821 4. Similarly, any other error likely would lead to a panic; now to
823 just the pattern failing to compile.
824 5. The old mechanism did not detect illegal ranges in the
826 definition of the property. Now, the range max must not be
827 smaller than the range min. Otherwise, the pattern fails to
828 compile.
829 6. The intention was to have each sub called only once during the
831 lifetime of the program, so that a property's definition is
832 immutable. This was relaxed so that it could be called once
833 for all /i compilations, and potentially a second time for
834 non-/i (the sub is passed a parameter indicating which).
835 However, in practice there were instances when this was broken,
836 and multiple calls were possible. Those have been fixed. Now
837 (besides the /i,non-/i cases) the only way a sub can be called
838 multiple times is if some component of it has not been defined
839 yet. For example, suppose we have sub IsA() whose definition
840 is known at compile time, and it in turn calls isB() whose
841 definition is not yet known. isA() will be called each time a
842 pattern it appears in is compiled. If isA() also calls isC()
843 and that definition is known, isC() will be called just once.
844 7. There were some races and very long hangs should one thread be
846 compiling the same property as another simultaneously. These
847 have now been fixed.
848 • Fixed a failure to match properly.
850 An EXACTFish regnode has a finite length it can hold for the string
852 being matched. If that length is exceeded, a second node is used
853 for the next segment of the string, for as many regnodes as are
854 needed. Care has to be taken where to break the string, in order
855 to deal multi-character folds in Unicode correctly. If we want to
856 break a string at a place which could potentially be in the middle
857 of a multi-character fold, we back off one (or more) characters,
858 leaving a shorter EXACTFish regnode. This backing off mechanism
859 contained an off-by-one error. [GH #16806]
860 <https://github.com/Perl/perl5/issues/16806>.
861 • A bare "eof" call with no previous file handle now returns true.
863 [GH #16786] <https://github.com/Perl/perl5/issues/16786>
864 • Failing to compile a format now aborts compilation. Like other
866 errors in sub-parses this could leave the parser in a strange
867 state, possibly crashing perl if compilation continued. [GH
868 #16169] <https://github.com/Perl/perl5/issues/16169>
869 • If an in-place edit is still in progress during global destruction
871 and the process exit code (as stored in $?) is zero, perl will now
872 treat the in-place edit as successful, replacing the input file
873 with any output produced.
874 This allows code like:
876 perl -i -ne 'print "Foo"; last'
878 to replace the input file, while code like:
880 perl -i -ne 'print "Foo"; die'
882 will not. Partly resolves [GH #16748]
884 <https://github.com/Perl/perl5/issues/16748>.
885 • A regression in 5.28 caused the following code to fail
887 close(STDIN); open(CHILD, "|wc -l")'
889 because the child's stdin would be closed on exec. This has now
891 been fixed.
892 • Fixed an issue where compiling a regexp containing both compile-
894 time and run-time code blocks could lead to trying to compile
895 something which is invalid syntax.
896 • Fixed build failures with "-DNO_LOCALE_NUMERIC" and
898 "-DNO_LOCALE_COLLATE". [GH #16771]
899 <https://github.com/Perl/perl5/issues/16771>.
900 • Prevent the tests in ext/B/t/strict.t from being skipped. [GH
902 #16783] <https://github.com/Perl/perl5/issues/16783>.
903 • "/di" nodes ending or beginning in s are now "EXACTF". We do not
905 want two "EXACTFU" to be joined together during optimization, and
906 to form a "ss", "sS", "Ss" or "SS" sequence; they are the only
907 multi-character sequences which may match differently under "/ui"
908 and "/di".
909
911 Perl 5.30.0 represents approximately 11 months of development since
912 Perl 5.28.0 and contains approximately 620,000 lines of changes across
913 1,300 files from 58 authors.
914 Excluding auto-generated files, documentation and release tools, there
916 were approximately 510,000 lines of changes to 750 .pm, .t, .c and .h
917 files.
918 Perl continues to flourish into its fourth decade thanks to a vibrant
920 community of users and developers. The following people are known to
921 have contributed the improvements that became Perl 5.30.0:
922 Aaron Crane, Abigail, Alberto Simões, Alexandr Savca, Andreas König,
924 Andy Dougherty, Aristotle Pagaltzis, Brian Greenfield, Chad Granum,
925 Chris 'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan
926 Book, Dan Dedrick, Daniel Dragan, Dan Kogai, David Cantrell, David
927 Mitchell, Dominic Hargreaves, E. Choroba, Ed J, Eugen Konkov, François
928 Perrad, Graham Knop, Hauke D, H.Merijn Brand, Hugo van der Sanden,
929 Jakub Wilk, James Clarke, James E Keenan, Jerry D. Hedden, Jim Cromie,
930 John SJ Anderson, Karen Etheridge, Karl Williamson, Leon Timmermans,
931 Matthias Bethke, Nicholas Clark, Nicolas R., Niko Tyni, Pali, Petr
932 Písař, Phil Pearl (Lobbes), Richard Leach, Ryan Voots, Sawyer X, Shlomi
933 Fish, Sisyphus, Slaven Rezic, Steve Hay, Sullivan Beck, Tina Müller,
934 Tomasz Konojacki, Tom Wyant, Tony Cook, Unicode Consortium, Yves Orton,
935 Zak B. Elep.
936 The list above is almost certainly incomplete as it is automatically
938 generated from version control history. In particular, it does not
939 include the names of most of the (very much appreciated) contributors
940 who reported issues to the Perl bug tracker. Noteworthy in this release
941 were the large number of bug fixes made possible by Sergey Aleynikov's
942 high quality perlbug reports for issues he discovered by fuzzing with
943 AFL.
944 Many of the changes included in this version originated in the CPAN
946 modules included in Perl's core. We're grateful to the entire CPAN
947 community for helping Perl to flourish.
948 For a more complete list of all of Perl's historical contributors,
950 please see the AUTHORS file in the Perl source distribution.
951
953 If you find what you think is a bug, you might check the perl bug
954 database at <https://rt.perl.org/>. There may also be information at
955 <http://www.perl.org/>, the Perl Home Page.
956 If you believe you have an unreported bug, please run the perlbug
958 program included with your release. Be sure to trim your bug down to a
959 tiny but sufficient test case. Your bug report, along with the output
960 of "perl -V", will be sent off to perlbug@perl.org to be analysed by
961 the Perl porting team.
962 If the bug you are reporting has security implications which make it
964 inappropriate to send to a publicly archived mailing list, then see
965 "SECURITY VULNERABILITY CONTACT INFORMATION" in perlsec for details of
966 how to report the issue.
967
969 If you wish to thank the Perl 5 Porters for the work we had done in
970 Perl 5, you can do so by running the "perlthanks" program:
971 perlthanks
973 This will send an email to the Perl 5 Porters list with your show of
975 thanks.
976
978 The Changes file for an explanation of how to view exhaustive details
979 on what changed.
980 The INSTALL file for how to build Perl.
982 The README file for general stuff.
984 The Artistic and Copying files for copyright information.
986perl v5.38.2 2023-11-30 PERL5300DELTA(1)