1PERL5340DELTA(1) Perl Programmers Reference Guide PERL5340DELTA(1)
2
6 perl5340delta - what is new for perl v5.34.0
7
9 This document describes differences between the 5.32.0 release and the
10 5.34.0 release.
11 If you are upgrading from an earlier release such as 5.30.0, first read
13 perl5320delta, which describes differences between 5.30.0 and 5.32.0.
14
16 Experimental Try/Catch Syntax
17 An initial experimental attempt at providing "try"/"catch" notation has
18 been added.
19 use feature 'try';
21 try {
23 a_function();
24 }
25 catch ($e) {
26 warn "An error occurred: $e";
27 }
28 For more information, see "Try Catch Exception Handling" in perlsyn.
30 "qr/{,n}/" is now accepted
32 An empty lower bound is now accepted for regular expression
33 quantifiers, like "m/x{,3}/" meaning "m/x{0,3}/"
34 Blanks freely allowed within but adjacent to curly braces
36 (in double-quotish contexts and regular expression patterns)
37 This means you can write things like "\x{ FFFC }" if you like. This
39 applies to all such constructs, namely "\b{}", "\g{}", "\k{}", "\N{}",
40 "\o{}", and "\x{}"; as well as the regular expression quantifier
41 "{m,n}". "\p{}" and "\P{}" retain their already-existing, even looser,
42 rules mandated by the Unicode standard (see "Properties accessible
43 through \p{} and \P{}" in perluniprops).
44 This ability is in effect regardless of the presence of the "/x"
46 regular expression pattern modifier.
47 Additionally, the comma in a regular expression braced quantifier may
49 have blanks (tabs or spaces) before and/or after the comma, like
50 "qr/a{ 5, 7 }/".
51 New octal syntax "0oddddd"
53 It is now possible to specify octal literals with "0o" prefixes, as in
54 "0o123_456", parallel to the existing construct to specify hexadecimal
55 literal "0xddddd" and binary literal "0bddddd". Also, the builtin
56 oct() function now accepts this new syntax.
57 See "Scalar value constructors" in perldata and "oct EXPR" in perlfunc.
59
61 • Fix a memory leak in RegEx [GH #18604
62 <https://github.com/Perl/perl5/issues/18604>]
63
65 New Modules and Pragmata
66 • ExtUtils::PL2Bat 0.004 has been added to the Perl core.
67 This module is a generalization of the "pl2bat" script. It being a
69 script has led to at least two forks of this code; this module will
70 unify them under one implementation with tests.
71 Updated Modules and Pragmata
73 • Archive::Tar has been upgraded from version 2.36 to 2.38.
74 • autodie has been upgraded from version 2.32 to 2.34.
76 • B has been upgraded from version 1.80 to 1.82.
78 • B::Deparse has been upgraded from version 1.54 to 1.56.
80 • bytes has been upgraded from version 1.07 to 1.08.
82 • Carp has been upgraded from version 1.50 to 1.52.
84 • Compress::Raw::Bzip2 has been upgraded from version 2.093 to 2.101.
86 • Compress::Raw::Zlib has been upgraded from version 2.093 to 2.101.
88 • Config::Perl::V has been upgraded from version 0.32 to 0.33.
90 • CPAN has been upgraded from version 2.27 to 2.28.
92 • Data::Dumper has been upgraded from version 2.174 to 2.179.
94 • DB has been upgraded from version 1.58 to 1.59.
96 • DB_File has been upgraded from version 1.853 to 1.855.
98 • Devel::Peek has been upgraded from version 1.28 to 1.30.
100 • Devel::PPPort has been upgraded from version 3.57 to 3.62.
102 New "PERL_VERSION_*" comparison macros are now available.
104 "ppport.h --api-info" no longer includes non-API info unless that
106 is the only match
107 • Digest has been upgraded from version 1.17_01 to 1.19.
109 • Digest::MD5 has been upgraded from version 2.55_01 to 2.58.
111 • DynaLoader has been upgraded from version 1.47 to 1.50.
113 • Encode has been upgraded from version 3.06 to 3.08.
115 • Env has been upgraded from version 1.04 to 1.05.
117 • Errno has been upgraded from version 1.30 to 1.33.
119 • experimental has been upgraded from version 0.020 to 0.024.
121 • Exporter has been upgraded from version 5.74 to 5.76.
123 • ExtUtils::CBuilder has been upgraded from version 0.280234 to
125 0.280236.
126 • ExtUtils::Install has been upgraded from version 2.14 to 2.20.
128 • ExtUtils::MakeMaker has been upgraded from version 7.44 to 7.62.
130 • ExtUtils::Manifest has been upgraded from version 1.72 to 1.73.
132 • ExtUtils::Miniperl has been upgraded from version 1.09 to 1.10.
134 • ExtUtils::ParseXS has been upgraded from version 3.40 to 3.43.
136 • ExtUtils::Typemaps has been upgraded from version 3.38 to 3.43.
138 • Fcntl has been upgraded from version 1.13 to 1.14.
140 • feature has been upgraded from version 1.58 to 1.64.
142 Added the default enabled "bareword_filehandles" feature.
144 A new multidimensional feature has been added, which is enabled by
146 default but allows turning off multi-dimensional array emulation.
147 • File::Copy has been upgraded from version 2.34 to 2.35.
149 • File::Fetch has been upgraded from version 0.56 to 1.00.
151 • File::Find has been upgraded from version 1.37 to 1.39.
153 • File::Path has been upgraded from version 2.16 to 2.18.
155 • File::Spec has been upgraded from version 3.78 to 3.80.
157 • File::Temp has been upgraded from version 0.2309 to 0.2311.
159 • Filter::Util::Call has been upgraded from version 1.59 to 1.60.
161 • FindBin has been upgraded from version 1.51 to 1.52.
163 • GDBM_File has been upgraded from version 1.18 to 1.19.
165 New functions and compatibility for newer versions of GDBM. [GH
167 #18435 <https://github.com/Perl/perl5/pull/18435>]
168 • Getopt::Long has been upgraded from version 2.51 to 2.52.
170 • Getopt::Std has been upgraded from version 1.12 to 1.13.
172 • Hash::Util has been upgraded from version 0.23 to 0.25.
174 • Hash::Util::FieldHash has been upgraded from version 1.20 to 1.21.
176 • I18N::LangTags has been upgraded from version 0.44 to 0.45.
178 • if has been upgraded from version 0.0608 to 0.0609.
180 • IO has been upgraded from version 1.43 to 1.46.
182 IO::Socket now stores error messages in $IO::Socket::errstr, in
184 addition to in $@.
185 The "error" method now reports the error state for both the input
187 and output streams for sockets and character devices. Similarly
188 "clearerr" now clears the error state for both streams.
189 A spurious error reported for regular file handles has been fixed
191 in IO::Handle. [GH #18019
192 <https://github.com/Perl/perl5/issues/18019>]
193 • IO-Compress has been upgraded from version 2.093 to 2.102.
195 bin/zipdetails version 2.02
197 • IO::Socket::IP has been upgraded from version 0.39 to 0.41.
199 • IO::Zlib has been upgraded from version 1.10 to 1.11.
201 • IPC::SysV has been upgraded from version 2.07 to 2.09.
203 • JSON::PP has been upgraded from version 4.04 to 4.06.
205 • The libnet distribution has been upgraded from version 3.11 to
207 3.13.
208 • locale has been upgraded from version 1.09 to 1.10.
210 • Math::Complex has been upgraded from version 1.5901 to 1.5902.
212 • MIME::Base64 has been upgraded from version 3.15 to 3.16.
214 • Module::CoreList has been upgraded from version 5.20200620 to
216 5.20210520.
217 • Module::Load has been upgraded from version 0.34 to 0.36.
219 • Module::Load::Conditional has been upgraded from version 0.70 to
221 0.74.
222 • mro has been upgraded from version 1.23 to 1.25_001.
224 • Net::Ping has been upgraded from version 2.72 to 2.74.
226 • NEXT has been upgraded from version 0.67_01 to 0.68.
228 • ODBM_File has been upgraded from version 1.16 to 1.17.
230 • Opcode has been upgraded from version 1.47 to 1.50.
232 • overload has been upgraded from version 1.31 to 1.33.
234 • perlfaq has been upgraded from version 5.20200523 to 5.20210411.
236 • PerlIO::encoding has been upgraded from version 0.28 to 0.30.
238 • PerlIO::mmap has been upgraded from version 0.016 to 0.017.
240 • PerlIO::scalar has been upgraded from version 0.30 to 0.31.
242 • PerlIO::via::QuotedPrint has been upgraded from version 0.08 to
244 0.09.
245 • Pod::Checker has been upgraded from version 1.73 to 1.74.
247 • Pod::Html has been upgraded from version 1.25 to 1.27.
249 • Pod::Simple has been upgraded from version 3.40 to 3.42.
251 • Pod::Usage has been upgraded from version 1.69 to 2.01.
253 • POSIX has been upgraded from version 1.94 to 1.97.
255 POSIX::signbit() behaviour has been improved. [GH #18441
257 <https://github.com/Perl/perl5/pull/18441>]
258 Documentation for "asctime" clarifies that the result is always in
260 English. (Use "strftime" for a localized result.)
261 • re has been upgraded from version 0.40 to 0.41.
263 (See under "Internal Changes" for more information.)
265 • Safe has been upgraded from version 2.41 to 2.43.
267 • Socket has been upgraded from version 2.029 to 2.031.
269 • Storable has been upgraded from version 3.21 to 3.23.
271 • strict has been upgraded from version 1.11 to 1.12.
273 • subs has been upgraded from version 1.03 to 1.04.
275 • Symbol has been upgraded from version 1.08 to 1.09.
277 • Test::Harness has been upgraded from version 3.42 to 3.43.
279 • Test::Simple has been upgraded from version 1.302175 to 1.302183.
281 • Text::Balanced has been upgraded from version 2.03 to 2.04.
283 • threads has been upgraded from version 2.25 to 2.26.
285 • threads::shared has been upgraded from version 1.61 to 1.62.
287 • Tie::RefHash has been upgraded from version 1.39 to 1.40.
289 • Time::HiRes has been upgraded from version 1.9764 to 1.9767.
291 • Time::Local has been upgraded from version 1.28 to 1.30.
293 • Unicode::Collate has been upgraded from version 1.27 to 1.29.
295 • Unicode::Normalize has been upgraded from version 1.27 to 1.28.
297 • utf8 has been upgraded from version 1.22 to 1.24.
299 • version has been upgraded from version 0.9924 to 0.9928.
301 • warnings has been upgraded from version 1.47 to 1.51.
303 • Win32 has been upgraded from version 0.53 to 0.57.
305 Fix calling convention for "PFNRegGetValueA".
307 Added Win32::IsSymlinkCreationAllowed(),
309 Win32::IsDeveloperModeEnabled(), and Win32::GetProcessPrivileges().
310 Removed old code for versions before Windows 2000.
312 • XS::APItest has been upgraded from version 1.09 to 1.16.
314 • XS::Typemap has been upgraded from version 0.17 to 0.18.
316
318 New Documentation
319 perldocstyle
320 This document is a guide for the authorship and maintenance of the
322 documentation that ships with Perl.
323 perlgov
325 This document describes the goals, scope, system, and rules for Perl's
327 new governance model.
328 Other pod files, most notably perlpolicy, were amended to reflect its
330 adoption.
331 Changes to Existing Documentation
333 We have attempted to update the documentation to reflect the changes
334 listed in this document. If you find any we have missed, open an issue
335 at <https://github.com/Perl/perl5/issues>.
336 Additionally, the following selected changes have been made:
338 • perlapi, perlguts, perlxs, and perlxstut now prefer "SvPVbyte" over
340 "SvPV".
341 • References to Pumpking have been replaced with a more accurate term
343 or Steering Council where appropriate.
344 • The Perl Steering Council is now the fallback contact for security
346 issues.
347 perlapi
349 • Efforts continue in improving the presentation of this document,
351 and to document more API elements.
352 perlcommunity
354 • The freenode IRC URL has been updated.
356 perldebguts
358 • Corrected the description of the scalar "${"_<$filename"}"
360 variables.
361 perldiag
363 • Now documents additional examples of "not imported" warnings.
365 perlfaq
367 • The Perl FAQ was updated to CPAN version 5.20201107 with minor
369 improvements.
370 perlfunc
372 • my() and state() now explicitly warn the reader that lexical
374 variables should typically not be redeclared within the same scope
375 or statement. [GH #18389
376 <https://github.com/Perl/perl5/issues/18389>]
377 • The localtime entry has been improved and now also states that the
379 result of the function is always in English.
380 • msgsnd() documented a length field included in the packed "MSG"
382 parameter to msgsnd(), but there was no such field. "MSG" contains
383 only the type and the message content.
384 • Better explanation of what happens when "sleep" is called with a
386 zero or negative value.
387 • Simplify the split() documentation by removing the join()s from the
389 examples [GH #18676 <https://github.com/Perl/perl5/issues/18676>]
390 perlgit
392 • document how to create a remote-tracking branch for every PR
394 • document how to get a PR as a local branch
396 perlguts
398 • perlguts now explains in greater detail the need to consult
400 "SvUTF8" when calling "SvPV" (or variants). A new "How do I pass a
401 Perl string to a C library?" section in the same document discusses
402 when to use which style of macro to read an SV's string value.
403 • Corrected "my_rpeep" example in perlguts.
405 • A section has been added on the formatted printing of special
407 sizes.
408 perlop
410 • The "<>" and "<<>>" operators are commonly referred to as the
412 diamond and double diamond operators respectively, but that wasn't
413 mentioned previously in their documentation.
414 • Document range op behavior change.
416 perlpacktut
418 • Incorrect variables used in an example have been fixed.
420 perlsyn
422 • Document that caller() does not see try{} blocks
424 • A new example shows how a lexical "my" variable can be declared
426 during the initialization of a "for" loop.
427 perlunifaq
429 • Fix description of what Perl does with unencoded strings
431
433 The following additions or changes have been made to diagnostic output,
434 including warnings and fatal error messages. For the complete list of
435 diagnostic messages, see perldiag.
436 New Diagnostics
438 New Errors
439 • Bareword filehandle "%s" not allowed under 'no feature
441 "bareword_filehandles"'
442 This accompanies the new bareword_filehandles feature.
444 • Multidimensional hash lookup is disabled
446 This accompanies the new multidimensional feature.
448 New Warnings
450 • Wide character in setenv key (encoding to utf8)
452 Attempts to put wide characters into environment variable keys via
454 %ENV now provoke this warning.
455 Changes to Existing Diagnostics
457 • Error %s in expansion of %s
458 An error was encountered in handling a user-defined property
460 ("User-Defined Character Properties" in perlunicode). These are
461 programmer written subroutines, hence subject to errors that may
462 prevent them from compiling or running.
463 • Infinite recursion in user-defined property
465 A user-defined property ("User-Defined Character Properties" in
467 perlunicode) can depend on the definitions of other user-defined
468 properties. If the chain of dependencies leads back to this
469 property, infinite recursion would occur, were it not for the check
470 that raised this error.
471 • Timeout waiting for another thread to define \p{%s}
473 The first time a user-defined property ("User-Defined Character
475 Properties" in perlunicode) is used, its definition is looked up
476 and converted into an internal form for more efficient handling in
477 subsequent uses. There could be a race if two or more threads
478 tried to do this processing nearly simultaneously.
479 • Unknown user-defined property name \p{%s}
481 You specified to use a property within the "\p{...}" which was a
483 syntactically valid user-defined property, but no definition was
484 found for it
485 • Too few arguments for subroutine '%s' (got %d; expected %d)
487 Subroutine argument-count mismatch errors now include the number of
489 given and expected arguments.
490 • Too many arguments for subroutine '%s' (got %d; expected %d)
492 Subroutine argument-count mismatch errors now include the number of
494 given and expected arguments.
495 • Lost precision when %s %f by 1
497 This warning was only issued for positive too-large values when
499 incrementing, and only for negative ones when decrementing. It is
500 now issued for both positive or negative too-large values. [GH
501 #18333 <https://github.com/Perl/perl5/issues/18333>]
502 • \K not permitted in lookahead/lookbehind in regex; marked by <--
504 HERE in m/%s/
505 This error was incorrectly produced in some cases involving nested
507 lookarounds. This has been fixed. [GH #18123
508 <https://github.com/Perl/perl5/issues/18123>]
509 • Use of uninitialized value%s
511 This warning may now include the array or hash index when the
513 uninitialized value is the result of an element not found. This
514 will only happen if the index is a simple non-magical variable.
515
517 perl5db.pl (the debugger)
518 • New option: "HistItemMinLength"
519 This option controls the minimum length a command must be to get
521 stored in history. Traditionally, this has been fixed at 2.
522 Changes to the debugger are often perilous, and new bugs should be
523 reported so the debugger can be debugged.
524 • Fix to "i" and "l" commands
526 The "i $var" and "l $var" commands work again with lexical
528 variables.
529
531 • Prevented incpath to spill into libpth
532 • Use realpath if available. (This might catch more duplicate paths.)
534 • Only include real existing paths.
536 • Filter inc paths out of libpth.
538 • stadtx hash support has been removed
540 stadtx support has been entirely removed. Previously, it could be
542 requested with "PERL_HASH_FUNC_STADTX", and was default in 64-bit
543 builds. It has been replaced with SipHash. SipHash has been more
544 rigorously reviewed than stadtx.
545 • Configure
547 A new probe checks for buggy libc implementations of the
549 "gcvt"/"qgcvt" functions. [GH #18170
550 <https://github.com/Perl/perl5/issues/18170>]
551 • "-Dusedefaultstrict"
553 Perl can now be built with strict on by default (using the
555 configuration option "-Dusedefaultstrict".
556 These strict defaults do not apply when "perl" is run via "-e" or
558 "-E".
559 This setting provides a diagnostic mechanism intended for
561 development purposes only and is thus undefined by default.
562 • The minimum supported Bison version is now 2.4, and the maximum is
564 3.7.
565 • Newer 64-bit versions of the Intel C/C++ compiler are now
567 recognised and have the correct flags set.
568 • We now trap SIGBUS when Configure checks for "va_copy".
570 On several systems the attempt to determine if we need "va_copy" or
572 similar results in a SIGBUS instead of the expected SIGSEGV, which
573 previously caused a core dump.
574 [GH #18148 <https://github.com/Perl/perl5/issues/18148>]
576
578 Tests were added and changed to reflect the other additions and changes
579 in this release. Furthermore, these significant changes were made:
580 • Split Config-dependent tests in t/opbasic/arith.t to t/op/arith2.t
582 • t/re/opt.t was added, providing a test harness for regexp
584 optimization. [GH #18213
585 <https://github.com/Perl/perl5/pull/18213>]
586 • A workaround for CPAN distributions needing dot in @INC has been
588 removed [GH #18394 <https://github.com/Perl/perl5/pull/18394>].
589 All distributions that previously required the workaround have now
590 been adapted.
591 • When testing in parallel on many-core platforms, you can now cause
593 the test suite to finish somewhat earlier, but with less logical
594 ordering of the tests, by setting
595 PERL_TEST_HARNESS_ASAP=1
597 while running the test suite.
599
601 New Platforms
602 9front
603 Allow building Perl on i386 9front systems (a fork of plan9).
604 Updated Platforms
606 Plan9
607 Improve support for Plan9 on i386 platforms.
608 MacOS (Darwin)
610 The hints file for darwin has been updated to handle future MacOS
611 versions beyond 10. [GH #17946
612 <https://github.com/Perl/perl5/issues/17946>]
613 Discontinued Platforms
615 Symbian
616 Support code relating to Symbian has been removed. Symbian was an
617 operating system for mobile devices. The port was last updated in
618 July 2009, and the platform itself in October 2012.
619 Platform-Specific Notes
621 DragonFlyBSD
622 Tests were updated to workaround DragonFlyBSD bugs in tc*()
623 functions <https://bugs.dragonflybsd.org/issues/3252> and ctime
624 updates <https://bugs.dragonflybsd.org/issues/3251>.
625 Mac OS X
627 A number of system libraries no longer exist as actual files on Big
628 Sur, even though "dlopen" will pretend they do, so now we fall back
629 to "dlopen" if a library file can not be found. [GH #18407
630 <https://github.com/Perl/perl5/issues/18407>]
631 Windows
633 Reading non-ASCII characters from the console when its codepage was
634 set to 65001 (UTF-8) was broken due to a bug in Windows. A
635 workaround for this problem has been implemented. [GH #18701
636 <https://github.com/Perl/perl5/issues/18701>]
637 Building with mingw.org compilers (version 3.4.5 or later) using
639 mingw runtime versions < 3.22 now works again. This was broken in
640 Perl 5.31.4.
641 Building with mingw.org compilers (version 3.4.5 or later) using
643 mingw runtime versions >= 3.21 now works (for compilers up to
644 version 5.3.0).
645 Makefile.mk, and thus support for dmake, has been removed. It is
647 still possible to build Perl on Windows using nmake (Makefile) and
648 GNU make (GNUmakefile). [GH #18511
649 <https://github.com/Perl/perl5/pull/18511>]
650 perl can now be built with "USE_QUADMATH" on MS Windows using
652 (32-bit and 64-bit) mingw-w64 ports of gcc. [GH #18465
653 <https://github.com/Perl/perl5/pull/18465>]
654 The pl2bat.pl utility now needs to "use ExtUtils::PL2Bat". This
656 could cause failures in parallel builds.
657 Windows now supports symlink() and readlink(), and lstat() is no
659 longer an alias for stat(). [GH #18005
660 <https://github.com/Perl/perl5/issues/18005>].
661 Unlike POSIX systems, creating a symbolic link on Windows requires
663 either elevated privileges or Windows 10 1703 or later with
664 Developer Mode enabled.
665 stat(), including "stat FILEHANDLE", and lstat() now uses our own
667 implementation that populates the device "dev" and inode numbers
668 "ino" returned rather than always returning zero. The number of
669 links "nlink" field is now always populated.
670 "${^WIN32_SLOPPY_STAT}" previously controlled whether the "nlink"
672 field was populated requiring a separate Windows API call to fetch,
673 since "nlink" and the other information required for stat() is now
674 retrieved in a single API call.
675 The "-r" and "-w" operators now return true for the "STDIN",
677 "STDOUT" and "STDERR" handles. Unfortunately it still won't return
678 true for duplicates of those handles. [GH #8502
679 <https://github.com/Perl/perl5/issues/8502>].
680 The times returned by stat() and lstat() are no longer incorrect
682 across Daylight Savings Time adjustments. [GH #6080
683 <https://github.com/Perl/perl5/issues/6080>].
684 "-x" on a filehandle should now match "-x" on the corresponding
686 filename on Vista or later. [GH #4145
687 <https://github.com/Perl/perl5/issues/4145>].
688 "-e '"'" no longer incorrectly returns true. [GH #12431
690 <https://github.com/Perl/perl5/issues/12431>].
691 The same manifest is now used for Visual C++ and gcc builds.
693 Previously, MSVC builds were using the /manifestdependency flag
695 instead of embedding perlexe.manifest, which caused issues such as
696 GetVersionEx() returning the wrong version number on Windows 10.
697 z/OS
699 The locale categories "LC_SYNTAX" and "LC_TOD" are now recognized.
700 Perl doesn't do anything with these, except it now allows you to
701 specify them. They are included in "LC_ALL".
702
704 • Corrected handling of double and long double parameters for perl's
705 implementation of formatted output for "-Dusequadmath" builds.
706 This applies to PerlIO_printf(), croak(), warn(), sv_catpvf() and
708 their variants.
709 Previously in "quadmath" builds, code like:
711 PerlIO_printf(PerlIO_stderr(), "%g", somedouble);
713 or
715 PerlIO_printf(PerlIO_stderr(), "%Lg", somelongdouble);
717 would erroneously throw an exception "panic: quadmath invalid
719 format ...", since the code added for quadmath builds assumed "NV"s
720 were the only floating point format passed into these functions.
721 This code would also process the standard C long double specifier
723 "L" as if it expected an "NV" ("__float128" for quadmath builds),
724 resulting in undefined behaviour.
725 These functions now correctly accept doubles, long doubles and NVs.
727 • Previously the right operand of bitwise shift operators (shift
729 amount) was implicitly cast from IV to int, but it might lead wrong
730 results if IV does not fit in int.
731 And also, shifting INT_MIN bits used to yield the shiftee unchanged
733 (treated as 0-bit shift instead of negative shift).
734 • A set of "cop_hints_exists_{pv,pvn,pvs,sv}" functions was added, to
736 support checking for the existence of keys in the hints hash of a
737 specific cop without needing to create a mortal copy of said value.
738 • An aid has been added for using the "DEBUG" macros when debugging
740 XS or C code. The comments in perl.h describe "DEBUG_PRE_STMTS" and
741 "DEBUG_POST_STMTS". which you can "#define" to do things like save
742 and restore "errno", in case the "DEBUG" calls are interfering with
743 that, or to display timestamps, or which thread it's coming from,
744 or the location of the call, or whatever. You can make a quick
745 hack to help you track something down without having to edit
746 individual "DEBUG" calls.
747 • Make "REFCOUNTED_HE_EXISTS" available outside of core
749 • All "SvTRUE"-ish functions now evaluate their arguments exactly
751 once. In 5.32, plain ""SvTRUE"" in perlapi was changed to do that;
752 now the rest do as well.
753 • Unicode is now a first class citizen when considering the pattern
755 /A*B/ where A and B are arbitrary. The pattern matching code tries
756 to make a tight loop to match the span of A's. The logic of this
757 was now really updated with support for UTF-8.
758 • The re module has a new function "optimization", which can return a
760 hashref of optimization data discovered about a compiled regexp.
761 • The "PERL_GLOBAL_STRUCT" compilation option has been removed, and
763 with it the need or the "dVAR" macro. "dVAR" remains defined as a
764 no-op outside "PERL_CORE" for backwards compatiblity with XS
765 modules.
766 • A new savestack type "SAVEt_HINTS_HH" has been added, which neatens
768 the previous behaviour of "SAVEt_HINTS". On previous versions the
769 types and values pushed to the save stack would depend on whether
770 the hints included the "HINT_LOCALIZE_HH" bit, which complicates
771 external code that inspects the save stack. The new version uses a
772 different savestack type to indicate the difference.
773 • A new API function "av_count" in perlapi has been added which gives
775 a clearly named way to find how many elements are in an array.
776
778 • Setting %ENV now properly handles upgraded strings in the key.
779 Previously Perl sent the SV's internal PV directly to the OS; now
780 it will handle keys as it has handled values since 5.18: attempt to
781 downgrade the string first; if that fails then warn and use the
782 utf8 form.
783 • Fix a memory leak in regcomp.c [GH #18604
785 <https://github.com/Perl/perl5/issues/18604>]
786 • pack/unpack format 'D' now works on all systems that could support
788 it
789 Previously if "NV == long double", now it is supported on all
791 platforms that have long doubles. In particular that means it is
792 now also supported on quadmath platforms.
793 • Skip trying to constant fold an incomplete op tree [GH #18380
795 <https://github.com/Perl/perl5/issues/18380>]
796 Constant folding of chained comparison op trees could fail under
798 certain conditions, causing perl to crash. As a quick fix, constant
799 folding is now skipped for such op trees. This also addresses [GH
800 #17917 <https://github.com/Perl/perl5/issues/17917>].
801 • %g formatting broken on Ubuntu-18.04, "NVSIZE == 8" [GH #18170
803 <https://github.com/Perl/perl5/issues/18170>]
804 Buggy libc implementations of the "gcvt" and "qgcvt" functions
806 caused "(s)printf" to incorrectly truncate %g formatted numbers. A
807 new Configure probe now checks for this, with the result that the
808 libc "sprintf" will be used in place of "gcvt" and "qgcvt".
809 Tests added as part of this fix also revealed related problems in
811 some Windows builds. The makefiles for MINGW builds on Windows have
812 thus been adjusted to use "USE_MINGW_ANSI_STDIO" by default,
813 ensuring that they also provide correct "(s)printf" formatting of
814 numbers.
815 • op.c: croak on "my $_" when "use utf8" is in effect [GH #18449
817 <https://github.com/Perl/perl5/issues/18449>]
818 The lexical topic feature experiment was removed in Perl v5.24 and
820 declaring "my $_" became a compile time error. However, it was
821 previously still possible to make this declaration if "use utf8"
822 was in effect.
823 • regexec.c: Fix assertion failure [GH #18451
825 <https://github.com/Perl/perl5/issues/18451>]
826 Fuzzing triggered an assertion failure in the regexp engine when
828 too many characters were copied into a buffer.
829 • semctl(), msgctl(), and shmctl() now properly reset the UTF-8 flag
831 on the "ARG" parameter if it's modified for "IPC_STAT" or "GETALL"
832 operations.
833 • semctl(), msgctl(), and shmctl() now attempt to downgrade the "ARG"
835 parameter if its value is being used as input to "IPC_SET" or
836 "SETALL" calls. A failed downgrade will thrown an exception.
837 • In cases where semctl(), msgctl() or shmctl() would treat the "ARG"
839 parameter as a pointer, an undefined value no longer generates a
840 warning. In most such calls the pointer isn't used anyway and this
841 allows you to supply "undef" for a value not used by the underlying
842 function.
843 • semop() now downgrades the "OPSTRING" parameter, msgsnd() now
845 downgrades the "MSG" parameter and shmwrite now downgrades the
846 "STRING" parameter to treat them as bytes. Previously they would
847 be left upgraded, providing a corrupted structure to the underlying
848 function call.
849 • msgrcv() now properly resets the UTF-8 flag the "VAR" parameter
851 when it is modified. Previously the UTF-8 flag could be left on,
852 resulting in a possibly corrupt result in "VAR".
853 • Magic is now called correctly for stacked file test operators. [GH
855 #18293 <https://github.com/Perl/perl5/issues/18293>]
856 • The "@ary = split(...)" optimization no longer switches in the
858 target array as the value stack. [GH #18232
859 <https://github.com/Perl/perl5/issues/18232>] Also see discussion
860 at
861 <https://github.com/Perl/perl5/pull/18014#issuecomment-671299506>.
862 • Fixed a bug in which some regexps with recursive subpatterns
864 matched incorrectly.
865 [GH #18096 <https://github.com/Perl/perl5/issues/18096>]
867 • On Win32, "waitpid(-1, WNOHANG)" could sometimes have a very large
869 timeout. [GH #16529 <https://github.com/Perl/perl5/issues/16529>]
870 • "MARK" and hence "items" are now correctly initialized in "BOOT"
872 XSUBs.
873 • Some list assignments involving "undef" on the left-hand side were
875 over-optimized and produced incorrect results. [GH #16685
876 <https://github.com/Perl/perl5/issues/16685>], [GH #17816
877 <https://github.com/Perl/perl5/issues/17816>]
878
880 None
881
883 None
884
886 Kent Fredric (KENTNL) passed away in February 2021. A native of New
887 Zealand and a self-described "huge geek," Kent was the author or
888 maintainer of 178 CPAN distributions, the Perl maintainer for the
889 Gentoo Linux distribution and a contributor to the Perl core
890 distribution. He is mourned by his family, friends and open source
891 software communities worldwide.
892
894 Perl 5.34.0 represents approximately 11 months of development since
895 Perl 5.32.0 and contains approximately 280,000 lines of changes across
896 2,100 files from 78 authors.
897 Excluding auto-generated files, documentation and release tools, there
899 were approximately 150,000 lines of changes to 1,300 .pm, .t, .c and .h
900 files.
901 Perl continues to flourish into its fourth decade thanks to a vibrant
903 community of users and developers. The following people are known to
904 have contributed the improvements that became Perl 5.34.0:
905 Aaron Crane, Adam Hartley, Andy Dougherty, Ben Cornett, Branislav
907 Zahradník, brian d foy, Chris 'BinGOs' Williams, Christian Walde
908 (Mithaldu), Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Book, Daniel
909 Böhmer, Daniel Laügt, Dan Kogai, David Cantrell, David Mitchell,
910 Dominic Hamon, E. Choroba, Ed J, Eric Herman, Eugene Alvin Villar,
911 Felipe Gasper, Giovanni Tataranni, Graham Knop, Graham Ollis, Hauke D,
912 H.Merijn Brand, Hugo van der Sanden, Ichinose Shogo, Ivan Baidakou, Jae
913 Bradley, James E Keenan, Jason McIntosh, jkahrman, John Karr, John
914 Lightsey, Kang-min Liu, Karen Etheridge, Karl Williamson, Keith
915 Thompson, Leon Timmermans, Marc Reisner, Marcus Holland-Moritz, Max
916 Maischein, Michael G Schwern, Nicholas Clark, Nicolas R., Paul Evans,
917 Petr Písař, raiph, Renee Baecker, Ricardo Signes, Richard Leach,
918 Romano, Ryan Voots, Samanta Navarro, Samuel Thibault, Sawyer X, Scott
919 Baker, Sergey Poznyakoff, Sevan Janiyan, Shirakata Kentaro, Shlomi
920 Fish, Sisyphus, Sizhe Zhao, Steve Hay, TAKAI Kousuke, Thibault
921 Duponchelle, Todd Rinaldo, Tomasz Konojacki, Tom Hukins, Tom Stellard,
922 Tony Cook, vividsnow, Yves Orton, Zakariyya Mughal, Михаил Козачков.
923 The list above is almost certainly incomplete as it is automatically
925 generated from version control history. In particular, it does not
926 include the names of the (very much appreciated) contributors who
927 reported issues to the Perl bug tracker.
928 Many of the changes included in this version originated in the CPAN
930 modules included in Perl's core. We're grateful to the entire CPAN
931 community for helping Perl to flourish.
932 For a more complete list of all of Perl's historical contributors,
934 please see the AUTHORS file in the Perl source distribution.
935
937 If you find what you think is a bug, you might check the perl bug
938 database at <https://github.com/Perl/perl5/issues>. There may also be
939 information at <http://www.perl.org/>, the Perl Home Page.
940 If you believe you have an unreported bug, please open an issue at
942 <https://github.com/Perl/perl5/issues>. Be sure to trim your bug down
943 to a tiny but sufficient test case.
944 If the bug you are reporting has security implications which make it
946 inappropriate to send to a public issue tracker, then see "SECURITY
947 VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to
948 report the issue.
949
951 If you wish to thank the Perl 5 Porters for the work we had done in
952 Perl 5, you can do so by running the "perlthanks" program:
953 perlthanks
955 This will send an email to the Perl 5 Porters list with your show of
957 thanks.
958
960 The Changes file for an explanation of how to view exhaustive details
961 on what changed.
962 The INSTALL file for how to build Perl.
964 The README file for general stuff.
966 The Artistic and Copying files for copyright information.
968perl v5.38.2 2023-11-30 PERL5340DELTA(1)