PERL5340DELTA(1) Perl Programmers Reference Guide PERL5340DELTA(1) #
PERL5340DELTA(1) Perl Programmers Reference Guide PERL5340DELTA(1)
NNAAMMEE #
perl5340delta - what is new for perl v5.34.0
DDEESSCCRRIIPPTTIIOONN #
This document describes differences between the 5.32.0 release and the
5.34.0 release.
If you are upgrading from an earlier release such as 5.30.0, first read
perl5320delta, which describes differences between 5.30.0 and 5.32.0.
CCoorree EEnnhhaanncceemmeennttss EExxppeerriimmeennttaall TTrryy//CCaattcchh SSyynnttaaxx An initial experimental attempt at providing “try”/“catch” notation has been added.
use feature 'try';
try {
a_function();
}
catch ($e) {
warn "An error occurred: $e";
}
For more information, see "Try Catch Exception Handling" in perlsyn.
“"qqrr//{{,,nn}}//“” iiss nnooww aacccceepptteedd An empty lower bound is now accepted for regular expression quantifiers, like “m/x{,3}/” meaning “m/x{0,3}/”
BBllaannkkss ffrreeeellyy aalllloowweedd wwiitthhiinn bbuutt aaddjjaacceenntt ttoo ccuurrllyy bbrraacceess (in double-quotish contexts and regular expression patterns)
This means you can write things like "\x{ FFFC }" if you like. This
applies to all such constructs, namely "\b{}", "\g{}", "\k{}", "\N{}",
"\o{}", and "\x{}"; as well as the regular expression quantifier "{_m,_n}".
"\p{}" and "\P{}" retain their already-existing, even looser, rules
mandated by the Unicode standard (see "Properties accessible through \p{}
and \P{}" in perluniprops).
This ability is in effect regardless of the presence of the "/x" regular
expression pattern modifier.
Additionally, the comma in a regular expression braced quantifier may
have blanks (tabs or spaces) before and/or after the comma, like
"qr/a{ 5, 7 }/".
NNeeww ooccttaall ssyynnttaaxx “"00oo_d_d_d_d_d"” It is now possible to specify octal literals with “0o” prefixes, as in “0o123_456”, parallel to the existing construct to specify hexadecimal literal “0x_d_d_d_d_d” and binary literal “0b_d_d_d_d_d”. Also, the builtin “oct()” function now accepts this new syntax.
See "Scalar value constructors" in perldata and "oct EXPR" in perlfunc.
PPeerrffoorrmmaannccee EEnnhhaanncceemmeennttss • Fix a memory leak in RegEx [GH #18604 https://github.com/Perl/perl5/issues/18604]
MMoodduulleess aanndd PPrraaggmmaattaa NNeeww MMoodduulleess aanndd PPrraaggmmaattaa • ExtUtils::PL2Bat 0.004 has been added to the Perl core.
This module is a generalization of the "pl2bat" script. It being a
script has led to at least two forks of this code; this module will
unify them under one implementation with tests.
UUppddaatteedd MMoodduulleess aanndd PPrraaggmmaattaa • Archive::Tar has been upgraded from version 2.36 to 2.38.
• autodie has been upgraded from version 2.32 to 2.34.
• B has been upgraded from version 1.80 to 1.82.
• B::Deparse has been upgraded from version 1.54 to 1.56.
• bytes has been upgraded from version 1.07 to 1.08.
• Carp has been upgraded from version 1.50 to 1.52.
• Compress::Raw::Bzip2 has been upgraded from version 2.093 to 2.101.
• Compress::Raw::Zlib has been upgraded from version 2.093 to 2.101.
• Config::Perl::V has been upgraded from version 0.32 to 0.33.
• CPAN has been upgraded from version 2.27 to 2.28.
• Data::Dumper has been upgraded from version 2.174 to 2.179.
• DB has been upgraded from version 1.58 to 1.59.
• DB_File has been upgraded from version 1.853 to 1.855.
• Devel::Peek has been upgraded from version 1.28 to 1.30.
• Devel::PPPort has been upgraded from version 3.57 to 3.62.
New "PERL_VERSION_*" comparison macros are now available.
"ppport.h --api-info" no longer includes non-API info unless that is
the only match
• Digest has been upgraded from version 1.17_01 to 1.19.
• Digest::MD5 has been upgraded from version 2.55_01 to 2.58.
• DynaLoader has been upgraded from version 1.47 to 1.50.
• Encode has been upgraded from version 3.06 to 3.08.
• Env has been upgraded from version 1.04 to 1.05.
• Errno has been upgraded from version 1.30 to 1.33.
• experimental has been upgraded from version 0.020 to 0.024.
• Exporter has been upgraded from version 5.74 to 5.76.
• ExtUtils::CBuilder has been upgraded from version 0.280234 to
0.280236.
• ExtUtils::Install has been upgraded from version 2.14 to 2.20.
• ExtUtils::MakeMaker has been upgraded from version 7.44 to 7.62.
• ExtUtils::Manifest has been upgraded from version 1.72 to 1.73.
• ExtUtils::Miniperl has been upgraded from version 1.09 to 1.10.
• ExtUtils::ParseXS has been upgraded from version 3.40 to 3.43.
• ExtUtils::Typemaps has been upgraded from version 3.38 to 3.43.
• Fcntl has been upgraded from version 1.13 to 1.14.
• feature has been upgraded from version 1.58 to 1.64.
Added the default enabled "bareword_filehandles" feature.
A new multidimensional feature has been added, which is enabled by
default but allows turning off multi-dimensional array emulation.
• File::Copy has been upgraded from version 2.34 to 2.35.
• File::Fetch has been upgraded from version 0.56 to 1.00.
• File::Find has been upgraded from version 1.37 to 1.39.
• File::Path has been upgraded from version 2.16 to 2.18.
• File::Spec has been upgraded from version 3.78 to 3.80.
• File::Temp has been upgraded from version 0.2309 to 0.2311.
• Filter::Util::Call has been upgraded from version 1.59 to 1.60.
• FindBin has been upgraded from version 1.51 to 1.52.
• GDBM_File has been upgraded from version 1.18 to 1.19.
New functions and compatibility for newer versions of GDBM. [GH
#18435 <https://github.com/Perl/perl5/pull/18435>]
• Getopt::Long has been upgraded from version 2.51 to 2.52.
• Getopt::Std has been upgraded from version 1.12 to 1.13.
• Hash::Util has been upgraded from version 0.23 to 0.25.
• Hash::Util::FieldHash has been upgraded from version 1.20 to 1.21.
• I18N::LangTags has been upgraded from version 0.44 to 0.45.
• if has been upgraded from version 0.0608 to 0.0609.
• IO has been upgraded from version 1.43 to 1.46.
IO::Socket now stores error messages in $IO::Socket::errstr, in
addition to in $@.
The "error" method now reports the error state for both the input and
output streams for sockets and character devices. Similarly
"clearerr" now clears the error state for both streams.
A spurious error reported for regular file handles has been fixed in
IO::Handle. [GH #18019 <https://github.com/Perl/perl5/issues/18019>]
• IO-Compress has been upgraded from version 2.093 to 2.102.
bin/zipdetails version 2.02
• IO::Socket::IP has been upgraded from version 0.39 to 0.41.
• IO::Zlib has been upgraded from version 1.10 to 1.11.
• IPC::SysV has been upgraded from version 2.07 to 2.09.
• JSON::PP has been upgraded from version 4.04 to 4.06.
• The libnet distribution has been upgraded from version 3.11 to 3.13.
• locale has been upgraded from version 1.09 to 1.10.
• Math::Complex has been upgraded from version 1.5901 to 1.5902.
• MIME::Base64 has been upgraded from version 3.15 to 3.16.
• Module::CoreList has been upgraded from version 5.20200620 to
5.20210520.
• Module::Load has been upgraded from version 0.34 to 0.36.
• Module::Load::Conditional has been upgraded from version 0.70 to
0.74.
• mro has been upgraded from version 1.23 to 1.25_001.
• Net::Ping has been upgraded from version 2.72 to 2.74.
• NEXT has been upgraded from version 0.67_01 to 0.68.
• ODBM_File has been upgraded from version 1.16 to 1.17.
• Opcode has been upgraded from version 1.47 to 1.50.
• overload has been upgraded from version 1.31 to 1.33.
• perlfaq has been upgraded from version 5.20200523 to 5.20210411.
• PerlIO::encoding has been upgraded from version 0.28 to 0.30.
• PerlIO::mmap has been upgraded from version 0.016 to 0.017.
• PerlIO::scalar has been upgraded from version 0.30 to 0.31.
• PerlIO::via::QuotedPrint has been upgraded from version 0.08 to 0.09.
• Pod::Checker has been upgraded from version 1.73 to 1.74.
• Pod::Html has been upgraded from version 1.25 to 1.27.
• Pod::Simple has been upgraded from version 3.40 to 3.42.
• Pod::Usage has been upgraded from version 1.69 to 2.01.
• POSIX has been upgraded from version 1.94 to 1.97.
PPOOSSIIXX::::ssiiggnnbbiitt(()) behaviour has been improved. [GH #18441
<https://github.com/Perl/perl5/pull/18441>]
Documentation for "asctime" clarifies that the result is always in
English. (Use "strftime" for a localized result.)
• re has been upgraded from version 0.40 to 0.41.
(See under "Internal Changes" for more information.)
• Safe has been upgraded from version 2.41 to 2.43.
• Socket has been upgraded from version 2.029 to 2.031.
• Storable has been upgraded from version 3.21 to 3.23.
• strict has been upgraded from version 1.11 to 1.12.
• subs has been upgraded from version 1.03 to 1.04.
• Symbol has been upgraded from version 1.08 to 1.09.
• Test::Harness has been upgraded from version 3.42 to 3.43.
• Test::Simple has been upgraded from version 1.302175 to 1.302183.
• Text::Balanced has been upgraded from version 2.03 to 2.04.
• threads has been upgraded from version 2.25 to 2.26.
• threads::shared has been upgraded from version 1.61 to 1.62.
• Tie::RefHash has been upgraded from version 1.39 to 1.40.
• Time::HiRes has been upgraded from version 1.9764 to 1.9767.
• Time::Local has been upgraded from version 1.28 to 1.30.
• Unicode::Collate has been upgraded from version 1.27 to 1.29.
• Unicode::Normalize has been upgraded from version 1.27 to 1.28.
• utf8 has been upgraded from version 1.22 to 1.24.
• version has been upgraded from version 0.9924 to 0.9928.
• warnings has been upgraded from version 1.47 to 1.51.
• Win32 has been upgraded from version 0.53 to 0.57.
Fix calling convention for "PFNRegGetValueA".
Added "Win32::IsSymlinkCreationAllowed()",
"Win32::IsDeveloperModeEnabled()", and
"Win32::GetProcessPrivileges()".
Removed old code for versions before Windows 2000.
• XS::APItest has been upgraded from version 1.09 to 1.16.
• XS::Typemap has been upgraded from version 0.17 to 0.18.
DDooccuummeennttaattiioonn NNeeww DDooccuummeennttaattiioonn _p_e_r_l_d_o_c_s_t_y_l_e
This document is a guide for the authorship and maintenance of the
documentation that ships with Perl.
_p_e_r_l_g_o_v
This document describes the goals, scope, system, and rules for Perl's
new governance model.
Other pod files, most notably perlpolicy, were amended to reflect its
adoption.
CChhaannggeess ttoo EExxiissttiinngg DDooccuummeennttaattiioonn We have attempted to update the documentation to reflect the changes listed in this document. If you find any we have missed, open an issue at https://github.com/Perl/perl5/issues.
Additionally, the following selected changes have been made:
• perlapi, perlguts, perlxs, and perlxstut now prefer "SvPVbyte" over
"SvPV".
• References to PPuummppkkiinngg have been replaced with a more accurate term
or SStteeeerriinngg CCoouunncciill where appropriate.
• TThhee PPeerrll SStteeeerriinngg CCoouunncciill is now the fallback contact for security
issues.
_p_e_r_l_a_p_i
• Efforts continue in improving the presentation of this document, and
to document more API elements.
_p_e_r_l_c_o_m_m_u_n_i_t_y
• The freenode IRC URL has been updated.
_p_e_r_l_d_e_b_g_u_t_s
• Corrected the description of the scalar "${"_<$filename"}" variables.
_p_e_r_l_d_i_a_g
• Now documents additional examples of "not imported" warnings.
_p_e_r_l_f_a_q
• The Perl FAQ was updated to CPAN version 5.20201107 with minor
improvements.
_p_e_r_l_f_u_n_c
• mmyy(()) and ssttaattee(()) now explicitly warn the reader that lexical
variables should typically not be redeclared within the same scope or
statement. [GH #18389 <https://github.com/Perl/perl5/issues/18389>]
• The localtime entry has been improved and now also states that the
result of the function is always in English.
• mmssggssnndd(()) documented a length field included in the packed "MSG"
parameter to "msgsnd()", but there was no such field. "MSG" contains
only the type and the message content.
• Better explanation of what happens when "sleep" is called with a zero
or negative value.
• Simplify the "split()" documentation by removing the "join()"s from
the examples [GH #18676 <https://github.com/Perl/perl5/issues/18676>]
_p_e_r_l_g_i_t
• document how to create a remote-tracking branch for every PR
• document how to get a PR as a local branch
_p_e_r_l_g_u_t_s
• perlguts now explains in greater detail the need to consult "SvUTF8"
when calling "SvPV" (or variants). A new "How do I pass a Perl string
to a C library?" section in the same document discusses when to use
which style of macro to read an SV's string value.
• Corrected "my_rpeep" example in perlguts.
• A section has been added on the formatted printing of special sizes.
_p_e_r_l_o_p
• The "<>" and "<<>>" operators are commonly referred to as the diamond
and double diamond operators respectively, but that wasn't mentioned
previously in their documentation.
• Document range op behavior change.
_p_e_r_l_p_a_c_k_t_u_t
• Incorrect variables used in an example have been fixed.
_p_e_r_l_s_y_n
• Document that ccaalllleerr(()) does not see try{} blocks
• A new example shows how a lexical "my" variable can be declared
during the initialization of a "for" loop.
_p_e_r_l_u_n_i_f_a_q
• Fix description of what Perl does with unencoded strings
DDiiaaggnnoossttiiccss The following additions or changes have been made to diagnostic output, including warnings and fatal error messages. For the complete list of diagnostic messages, see perldiag.
NNeeww DDiiaaggnnoossttiiccss _N_e_w _E_r_r_o_r_s
• Bareword filehandle "%s" not allowed under 'no feature
"bareword_filehandles"'
This accompanies the new bareword_filehandles feature.
• Multidimensional hash lookup is disabled
This accompanies the new multidimensional feature.
_N_e_w _W_a_r_n_i_n_g_s
• Wide character in setenv key (encoding to utf8)
Attempts to put wide characters into environment variable keys via
%ENV now provoke this warning.
CChhaannggeess ttoo EExxiissttiinngg DDiiaaggnnoossttiiccss • Error %s in expansion of %s
An error was encountered in handling a user-defined property ("User-
Defined Character Properties" in perlunicode). These are programmer
written subroutines, hence subject to errors that may prevent them
from compiling or running.
• Infinite recursion in user-defined property
A user-defined property ("User-Defined Character Properties" in
perlunicode) can depend on the definitions of other user-defined
properties. If the chain of dependencies leads back to this
property, infinite recursion would occur, were it not for the check
that raised this error.
• Timeout waiting for another thread to define \p{%s}
The first time a user-defined property ("User-Defined Character
Properties" in perlunicode) is used, its definition is looked up and
converted into an internal form for more efficient handling in
subsequent uses. There could be a race if two or more threads tried
to do this processing nearly simultaneously.
• Unknown user-defined property name \p{%s}
You specified to use a property within the "\p{...}" which was a
syntactically valid user-defined property, but no definition was
found for it
• Too few arguments for subroutine '%s' (got %d; expected %d)
Subroutine argument-count mismatch errors now include the number of
given and expected arguments.
• Too many arguments for subroutine '%s' (got %d; expected %d)
Subroutine argument-count mismatch errors now include the number of
given and expected arguments.
• Lost precision when %s %f by 1
This warning was only issued for positive too-large values when
incrementing, and only for negative ones when decrementing. It is
now issued for both positive or negative too-large values. [GH
#18333 <https://github.com/Perl/perl5/issues/18333>]
• \K not permitted in lookahead/lookbehind in regex; marked by <-- HERE
in m/%s/
This error was incorrectly produced in some cases involving nested
lookarounds. This has been fixed. [GH #18123
<https://github.com/Perl/perl5/issues/18123>]
• Use of uninitialized value%s
This warning may now include the array or hash index when the
uninitialized value is the result of an element not found. This will
only happen if the index is a simple non-magical variable.
UUttiilliittyy CChhaannggeess ppeerrll55ddbb..ppll ((tthhee ddeebbuuggggeerr)) • New option: “HistItemMinLength”
This option controls the minimum length a command must be to get
stored in history. Traditionally, this has been fixed at 2. Changes
to the debugger are often perilous, and new bugs should be reported
so the debugger can be debugged.
• Fix to "i" and "l" commands
The "i $var" and "l $var" commands work again with lexical variables.
CCoonnffiigguurraattiioonn aanndd CCoommppiillaattiioonn • Prevented incpath to spill into libpth
• Use realpath if available. (This might catch more duplicate paths.)
• Only include real existing paths.
• Filter inc paths out of libpth.
• stadtx hash support has been removed
stadtx support has been entirely removed. Previously, it could be
requested with "PERL_HASH_FUNC_STADTX", and was default in 64-bit
builds. It has been replaced with SipHash. SipHash has been more
rigorously reviewed than stadtx.
• Configure
A new probe checks for buggy libc implementations of the
"gcvt"/"qgcvt" functions. [GH #18170
<https://github.com/Perl/perl5/issues/18170>]
• "-Dusedefaultstrict"
Perl can now be built with strict on by default (using the
configuration option "-Dusedefaultstrict".
These strict defaults do not apply when "perl" is run via "-e" or
“-E”. #
This setting provides a diagnostic mechanism intended for development
purposes only and is thus undefined by default.
• The minimum supported Bison version is now 2.4, and the maximum is
3.7.
• Newer 64-bit versions of the Intel C/C++ compiler are now recognised
and have the correct flags set.
• We now trap SIGBUS when _C_o_n_f_i_g_u_r_e checks for "va_copy".
On several systems the attempt to determine if we need "va_copy" or
similar results in a SIGBUS instead of the expected SIGSEGV, which
previously caused a core dump.
[GH #18148 <https://github.com/Perl/perl5/issues/18148>]
TTeessttiinngg Tests were added and changed to reflect the other additions and changes in this release. Furthermore, these significant changes were made:
• Split Config-dependent tests in _t_/_o_p_b_a_s_i_c_/_a_r_i_t_h_._t to _t_/_o_p_/_a_r_i_t_h_2_._t
• _t_/_r_e_/_o_p_t_._t was added, providing a test harness for regexp
optimization. [GH #18213 <https://github.com/Perl/perl5/pull/18213>]
• A workaround for CPAN distributions needing dot in @INC has been
removed [GH #18394 <https://github.com/Perl/perl5/pull/18394>]. All
distributions that previously required the workaround have now been
adapted.
• When testing in parallel on many-core platforms, you can now cause
the test suite to finish somewhat earlier, but with less logical
ordering of the tests, by setting
PERL_TEST_HARNESS_ASAP=1 #
while running the test suite.
PPllaattffoorrmm SSuuppppoorrtt NNeeww PPllaattffoorrmmss 9front Allow building Perl on i386 9front systems (a fork of plan9).
UUppddaatteedd PPllaattffoorrmmss Plan9 Improve support for Plan9 on i386 platforms.
MacOS (Darwin)
The hints file for darwin has been updated to handle future MacOS
versions beyond 10. [GH #17946
<https://github.com/Perl/perl5/issues/17946>]
DDiissccoonnttiinnuueedd PPllaattffoorrmmss Symbian Support code relating to Symbian has been removed. Symbian was an operating system for mobile devices. The port was last updated in July 2009, and the platform itself in October 2012.
PPllaattffoorrmm--SSppeecciiffiicc NNootteess DragonFlyBSD Tests were updated to workaround DragonFlyBSD bugs in tc*() functions https://bugs.dragonflybsd.org/issues/3252 and ctime updates https://bugs.dragonflybsd.org/issues/3251.
Mac OS X
A number of system libraries no longer exist as actual files on Big
Sur, even though "dlopen" will pretend they do, so now we fall back
to "dlopen" if a library file can not be found. [GH #18407
<https://github.com/Perl/perl5/issues/18407>]
Windows
Reading non-ASCII characters from the console when its codepage was
set to 65001 (UTF-8) was broken due to a bug in Windows. A workaround
for this problem has been implemented. [GH #18701
<https://github.com/Perl/perl5/issues/18701>]
Building with mingw.org compilers (version 3.4.5 or later) using
mingw runtime versions < 3.22 now works again. This was broken in
Perl 5.31.4.
Building with mingw.org compilers (version 3.4.5 or later) using
mingw runtime versions >= 3.21 now works (for compilers up to version
5.3.0).
_M_a_k_e_f_i_l_e_._m_k, and thus support for dmake, has been removed. It is
still possible to build Perl on Windows using nmake (Makefile) and
GNU make (GNUmakefile). [GH #18511
<https://github.com/Perl/perl5/pull/18511>]
perl can now be built with "USE_QUADMATH" on MS Windows using (32-bit
and 64-bit) mingw-w64 ports of gcc. [GH #18465
<https://github.com/Perl/perl5/pull/18465>]
The _p_l_2_b_a_t_._p_l utility now needs to "use ExtUtils::PL2Bat". This could
cause failures in parallel builds.
Windows now supports ssyymmlliinnkk(()) and rreeaaddlliinnkk(()), and llssttaatt(()) is no
longer an alias for ssttaatt(()). [GH #18005
<https://github.com/Perl/perl5/issues/18005>].
Unlike POSIX systems, creating a symbolic link on Windows requires
either elevated privileges or Windows 10 1703 or later with Developer
Mode enabled.
ssttaatt(()), including "stat FILEHANDLE", and llssttaatt(()) now uses our own
implementation that populates the device "dev" and inode numbers
"ino" returned rather than always returning zero. The number of
links "nlink" field is now always populated.
"${^WIN32_SLOPPY_STAT}" previously controlled whether the "nlink"
field was populated requiring a separate Windows API call to fetch,
since "nlink" and the other information required for "stat()" is now
retrieved in a single API call.
The "-r" and "-w" operators now return true for the "STDIN", "STDOUT"
and "STDERR" handles. Unfortunately it still won't return true for
duplicates of those handles. [GH #8502
<https://github.com/Perl/perl5/issues/8502>].
The times returned by ssttaatt(()) and llssttaatt(()) are no longer incorrect
across Daylight Savings Time adjustments. [GH #6080
<https://github.com/Perl/perl5/issues/6080>].
"-x" on a filehandle should now match "-x" on the corresponding
filename on Vista or later. [GH #4145
<https://github.com/Perl/perl5/issues/4145>].
"-e '"'" no longer incorrectly returns true. [GH #12431
<https://github.com/Perl/perl5/issues/12431>].
The same manifest is now used for Visual C++ and gcc builds.
Previously, MSVC builds were using the //mmaanniiffeessttddeeppeennddeennccyy flag
instead of embedding _p_e_r_l_e_x_e_._m_a_n_i_f_e_s_t, which caused issues such as
"GetVersionEx()" returning the wrong version number on Windows 10.
z/OS
The locale categories "LC_SYNTAX" and "LC_TOD" are now recognized.
Perl doesn't do anything with these, except it now allows you to
specify them. They are included in "LC_ALL".
IInntteerrnnaall CChhaannggeess • Corrected handling of double and long double parameters for perl’s implementation of formatted output for “-Dusequadmath” builds.
This applies to "PerlIO_printf()", "croak()", "warn()", "sv_catpvf()"
and their variants.
Previously in "quadmath" builds, code like:
PerlIO_printf(PerlIO_stderr(), "%g", somedouble);
or
PerlIO_printf(PerlIO_stderr(), "%Lg", somelongdouble);
would erroneously throw an exception "panic: quadmath invalid format
...", since the code added for quadmath builds assumed "NV"s were the
only floating point format passed into these functions.
This code would also process the standard C long double specifier "L"
as if it expected an "NV" ("__float128" for quadmath builds),
resulting in undefined behaviour.
These functions now correctly accept doubles, long doubles and NVs.
• Previously the right operand of bitwise shift operators (shift
amount) was implicitly cast from IV to int, but it might lead wrong
results if IV does not fit in int.
And also, shifting INT_MIN bits used to yield the shiftee unchanged
(treated as 0-bit shift instead of negative shift).
• A set of "cop_hints_exists_{pv,pvn,pvs,sv}" functions was added, to
support checking for the existence of keys in the hints hash of a
specific cop without needing to create a mortal copy of said value.
• An aid has been added for using the "DEBUG" macros when debugging XS
or C code. The comments in _p_e_r_l_._h describe "DEBUG_PRE_STMTS" and
"DEBUG_POST_STMTS". which you can "#define" to do things like save
and restore "errno", in case the "DEBUG" calls are interfering with
that, or to display timestamps, or which thread it's coming from, or
the location of the call, or whatever. You can make a quick hack to
help you track something down without having to edit individual
"DEBUG" calls.
• Make "REFCOUNTED_HE_EXISTS" available outside of core
• All "SvTRUE"-ish functions now evaluate their arguments exactly once.
In 5.32, plain ""SvTRUE"" in perlapi was changed to do that; now the
rest do as well.
• Unicode is now a first class citizen when considering the pattern
/A*B/ where A and B are arbitrary. The pattern matching code tries
to make a tight loop to match the span of A's. The logic of this was
now really updated with support for UTF-8.
• The re module has a new function "optimization", which can return a
hashref of optimization data discovered about a compiled regexp.
• The "PERL_GLOBAL_STRUCT" compilation option has been removed, and
with it the need or the "dVAR" macro. "dVAR" remains defined as a
no-op outside "PERL_CORE" for backwards compatiblity with XS modules.
• A new savestack type "SAVEt_HINTS_HH" has been added, which neatens
the previous behaviour of "SAVEt_HINTS". On previous versions the
types and values pushed to the save stack would depend on whether the
hints included the "HINT_LOCALIZE_HH" bit, which complicates external
code that inspects the save stack. The new version uses a different
savestack type to indicate the difference.
• A new API function "av_count" in perlapi has been added which gives a
clearly named way to find how many elements are in an array.
SSeelleecctteedd BBuugg FFiixxeess • Setting %ENV now properly handles upgraded strings in the key. Previously Perl sent the SV’s internal PV directly to the OS; now it will handle keys as it has handled values since 5.18: attempt to downgrade the string first; if that fails then warn and use the utf8 form.
• Fix a memory leak in regcomp.c [GH #18604
<https://github.com/Perl/perl5/issues/18604>]
• pack/unpack format 'D' now works on all systems that could support it
Previously if "NV == long double", now it is supported on all
platforms that have long doubles. In particular that means it is now
also supported on quadmath platforms.
• Skip trying to constant fold an incomplete op tree [GH #18380
<https://github.com/Perl/perl5/issues/18380>]
Constant folding of chained comparison op trees could fail under
certain conditions, causing perl to crash. As a quick fix, constant
folding is now skipped for such op trees. This also addresses [GH
#17917 <https://github.com/Perl/perl5/issues/17917>].
• %g formatting broken on Ubuntu-18.04, "NVSIZE == 8" [GH #18170
<https://github.com/Perl/perl5/issues/18170>]
Buggy libc implementations of the "gcvt" and "qgcvt" functions caused
"(s)printf" to incorrectly truncate %g formatted numbers. A new
Configure probe now checks for this, with the result that the libc
"sprintf" will be used in place of "gcvt" and "qgcvt".
Tests added as part of this fix also revealed related problems in
some Windows builds. The makefiles for MINGW builds on Windows have
thus been adjusted to use "USE_MINGW_ANSI_STDIO" by default, ensuring
that they also provide correct "(s)printf" formatting of numbers.
• _o_p_._c: croak on "my $_" when "use utf8" is in effect [GH #18449
<https://github.com/Perl/perl5/issues/18449>]
The lexical topic feature experiment was removed in Perl v5.24 and
declaring "my $_" became a compile time error. However, it was
previously still possible to make this declaration if "use utf8" was
in effect.
• _r_e_g_e_x_e_c_._c: Fix assertion failure [GH #18451
<https://github.com/Perl/perl5/issues/18451>]
Fuzzing triggered an assertion failure in the regexp engine when too
many characters were copied into a buffer.
• sseemmccttll(()), mmssggccttll(()), and sshhmmccttll(()) now properly reset the UTF-8 flag on
the "ARG" parameter if it's modified for "IPC_STAT" or "GETALL"
operations.
• "semctl()", "msgctl()", and "shmctl()" now attempt to downgrade the
"ARG" parameter if its value is being used as input to "IPC_SET" or
"SETALL" calls. A failed downgrade will thrown an exception.
• In cases where "semctl()", "msgctl()" or "shmctl()" would treat the
"ARG" parameter as a pointer, an undefined value no longer generates
a warning. In most such calls the pointer isn't used anyway and this
allows you to supply "undef" for a value not used by the underlying
function.
• sseemmoopp(()) now downgrades the "OPSTRING" parameter, mmssggssnndd(()) now
downgrades the "MSG" parameter and shmwrite now downgrades the
"STRING" parameter to treat them as bytes. Previously they would be
left upgraded, providing a corrupted structure to the underlying
function call.
• mmssggrrccvv(()) now properly resets the UTF-8 flag the "VAR" parameter when
it is modified. Previously the UTF-8 flag could be left on,
resulting in a possibly corrupt result in "VAR".
• Magic is now called correctly for stacked file test operators. [GH
#18293 <https://github.com/Perl/perl5/issues/18293>]
• The "@ary = split(...)" optimization no longer switches in the target
array as the value stack. [GH #18232
<https://github.com/Perl/perl5/issues/18232>] Also see discussion at
<https://github.com/Perl/perl5/pull/18014#issuecomment-671299506>.
• Fixed a bug in which some regexps with recursive subpatterns matched
incorrectly.
[GH #18096 <https://github.com/Perl/perl5/issues/18096>]
• On Win32, "waitpid(-1, WNOHANG)" could sometimes have a very large
timeout. [GH #16529 <https://github.com/Perl/perl5/issues/16529>]
• "MARK" and hence "items" are now correctly initialized in "BOOT"
XSUBs.
• Some list assignments involving "undef" on the left-hand side were
over-optimized and produced incorrect results. [GH #16685
<https://github.com/Perl/perl5/issues/16685>], [GH #17816
<https://github.com/Perl/perl5/issues/17816>]
KKnnoowwnn PPrroobblleemmss None
EErrrraattaa FFrroomm PPrreevviioouuss RReelleeaasseess None
OObbiittuuaarryy Kent Fredric (KENTNL) passed away in February 2021. A native of New Zealand and a self-described “huge geek,” Kent was the author or maintainer of 178 CPAN distributions, the Perl maintainer for the Gentoo Linux distribution and a contributor to the Perl core distribution. He is mourned by his family, friends and open source software communities worldwide.
AAcckknnoowwlleeddggeemmeennttss Perl 5.34.0 represents approximately 11 months of development since Perl 5.32.0 and contains approximately 280,000 lines of changes across 2,100 files from 78 authors.
Excluding auto-generated files, documentation and release tools, there
were approximately 150,000 lines of changes to 1,300 .pm, .t, .c and .h
files.
Perl continues to flourish into its fourth decade thanks to a vibrant
community of users and developers. The following people are known to have
contributed the improvements that became Perl 5.34.0:
Aaron Crane, Adam Hartley, Andy Dougherty, Ben Cornett, Branislav
Zahradník, brian d foy, Chris 'BinGOs' Williams, Christian Walde
(Mithaldu), Craig A. Berry, Dagfinn Ilmari Mannsåker, Dan Book, Daniel
Böhmer, Daniel Laügt, Dan Kogai, David Cantrell, David Mitchell, Dominic
Hamon, E. Choroba, Ed J, Eric Herman, Eric Lindblad, Eugene Alvin Villar,
Felipe Gasper, Giovanni Tataranni, Graham Knop, Graham Ollis, Hauke D,
H.Merijn Brand, Hugo van der Sanden, Ichinose Shogo, Ivan Baidakou, Jae
Bradley, James E Keenan, Jason McIntosh, jkahrman, John Karr, John
Lightsey, Kang-min Liu, Karen Etheridge, Karl Williamson, Keith Thompson,
Leon Timmermans, Marc Reisner, Marcus Holland-Moritz, Max Maischein,
Michael G Schwern, Nicholas Clark, Nicolas R., Paul Evans, Petr Písař,
raiph, Renee Baecker, Ricardo Signes, Richard Leach, Romano, Ryan Voots,
Samanta Navarro, Samuel Thibault, Sawyer X, Scott Baker, Sergey
Poznyakoff, Sevan Janiyan, Shirakata Kentaro, Shlomi Fish, Sisyphus,
Sizhe Zhao, Steve Hay, TAKAI Kousuke, Thibault Duponchelle, Todd Rinaldo,
Tomasz Konojacki, Tom Hukins, Tom Stellard, Tony Cook, vividsnow, Yves
Orton, Zakariyya Mughal, Михаил Козачков.
The list above is almost certainly incomplete as it is automatically
generated from version control history. In particular, it does not
include the names of the (very much appreciated) contributors who
reported issues to the Perl bug tracker.
Many of the changes included in this version originated in the CPAN
modules included in Perl's core. We're grateful to the entire CPAN
community for helping Perl to flourish.
For a more complete list of all of Perl's historical contributors, please
see the _A_U_T_H_O_R_S file in the Perl source distribution.
RReeppoorrttiinngg BBuuggss If you find what you think is a bug, you might check the perl bug database at https://github.com/Perl/perl5/issues. There may also be information at http://www.perl.org/, the Perl Home Page.
If you believe you have an unreported bug, please open an issue at
<https://github.com/Perl/perl5/issues>. Be sure to trim your bug down to
a tiny but sufficient test case.
If the bug you are reporting has security implications which make it
inappropriate to send to a public issue tracker, then see "SECURITY
VULNERABILITY CONTACT INFORMATION" in perlsec for details of how to
report the issue.
GGiivvee TThhaannkkss If you wish to thank the Perl 5 Porters for the work we had done in Perl 5, you can do so by running the “perlthanks” program:
perlthanks
This will send an email to the Perl 5 Porters list with your show of
thanks.
SSEEEE AALLSSOO #
The _C_h_a_n_g_e_s file for an explanation of how to view exhaustive details on
what changed.
The _I_N_S_T_A_L_L file for how to build Perl.
The _R_E_A_D_M_E file for general stuff.
The _A_r_t_i_s_t_i_c and _C_o_p_y_i_n_g files for copyright information.
perl v5.36.3 2023-02-15 PERL5340DELTA(1)