In perl.git, the branch maint-5.24 has been updated <http://perl5.git.perl.org/perl.git/commitdiff/eb261839aabffdf397fb2860ef005d3e2b5fdb41?hp=2401e9285b28d1b9226b711780dabd21ee02a9c1>
- Log ----------------------------------------------------------------- commit eb261839aabffdf397fb2860ef005d3e2b5fdb41 Author: Steve Hay <[email protected]> Date: Sat Jul 16 12:32:32 2016 +0100 Fill in Documentation and Testing sections of perldelta M pod/perldelta.pod commit 70219991408146ff5157c1f3139f858ebe5a59d6 Author: Steve Hay <[email protected]> Date: Sat Jul 16 12:27:05 2016 +0100 Remove boilerplate from perldelta Also fix the command to generate the Acknowledgements section, which was wrong because the new perldelta had not been created after 5.24.0 was released, so that ended up getting done *after* the version number had been bumped. M pod/perldelta.pod commit 5c48d033fe563470fe91345c27bd76b93a509acd Author: Steve Hay <[email protected]> Date: Sat Jul 16 12:14:22 2016 +0100 Update Modules and Pragmata section with Porting/corelist-perldelta.pl M pod/perldelta.pod commit 036951d43f5fe0e43cde134cb1a17a06a3e65d41 Author: Steve Hay <[email protected]> Date: Sat Jul 16 12:12:57 2016 +0100 Fix typo in perldelta M pod/perldelta.pod commit 5baad3ceb5a409e3ac3b45d11c9a9c79b6ac0616 Author: Tony Cook <[email protected]> Date: Wed Jun 8 16:41:38 2016 +1000 perldelta for the 79881ad71252 merge (cherry picked from commit 1ba11575b2c75391c309a50dd8070f5c2af46656) M pod/perldelta.pod commit 6e59b5a78467b8406124b6b95542a672ee287212 Author: Steve Hay <[email protected]> Date: Sat Jul 16 12:09:24 2016 +0100 Create new perldelta for 5.24.1 M MANIFEST M Makefile.SH M pod/.gitignore M pod/perl.pod A pod/perl5240delta.pod M pod/perldelta.pod M vms/descrip_mms.template M win32/GNUmakefile M win32/Makefile M win32/makefile.mk M win32/pod.mak ----------------------------------------------------------------------- Summary of changes: MANIFEST | 1 + Makefile.SH | 8 +- pod/.gitignore | 2 +- pod/perl.pod | 1 + pod/{perldelta.pod => perl5240delta.pod} | 2 +- pod/perldelta.pod | 2216 +----------------------------- vms/descrip_mms.template | 2 +- win32/GNUmakefile | 4 +- win32/Makefile | 4 +- win32/makefile.mk | 4 +- win32/pod.mak | 4 + 11 files changed, 62 insertions(+), 2186 deletions(-) copy pod/{perldelta.pod => perl5240delta.pod} (99%) diff --git a/MANIFEST b/MANIFEST index f117a92..e4331f1 100644 --- a/MANIFEST +++ b/MANIFEST @@ -4645,6 +4645,7 @@ pod/perl5203delta.pod Perl changes in version 5.20.3 pod/perl5220delta.pod Perl changes in version 5.22.0 pod/perl5221delta.pod Perl changes in version 5.22.1 pod/perl5222delta.pod Perl changes in version 5.22.2 +pod/perl5240delta.pod Perl changes in version 5.24.0 pod/perl561delta.pod Perl changes in version 5.6.1 pod/perl56delta.pod Perl changes in version 5.6 pod/perl581delta.pod Perl changes in version 5.8.1 diff --git a/Makefile.SH b/Makefile.SH index 916b332..8e943c4 100755 --- a/Makefile.SH +++ b/Makefile.SH @@ -522,7 +522,7 @@ miniperl_objs = $(miniperl_objs_nodt) $(DTRACE_MINI_O) perllib_objs = $(perllib_objs_nodt) $(DTRACE_PERLLIB_O) perlmain_objs = perlmain$(OBJ_EXT) $(DTRACE_MAIN_O) -perltoc_pod_prereqs = extra.pods pod/perl5240delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod +perltoc_pod_prereqs = extra.pods pod/perl5241delta.pod pod/perlapi.pod pod/perlintern.pod pod/perlmodlib.pod pod/perluniprops.pod generated_pods = pod/perltoc.pod $(perltoc_pod_prereqs) generated_headers = uudmap.h bitcount.h mg_data.h @@ -1085,9 +1085,9 @@ pod/perlintern.pod: $(MINIPERL_EXE) autodoc.pl embed.fnc pod/perlmodlib.pod: $(MINIPERL_EXE) pod/perlmodlib.PL MANIFEST $(MINIPERL) pod/perlmodlib.PL -q -pod/perl5240delta.pod: pod/perldelta.pod - $(RMS) pod/perl5240delta.pod - $(LNS) perldelta.pod pod/perl5240delta.pod +pod/perl5241delta.pod: pod/perldelta.pod + $(RMS) pod/perl5241delta.pod + $(LNS) perldelta.pod pod/perl5241delta.pod extra.pods: $(MINIPERL_EXE) -@test ! -f extra.pods || rm -f `cat extra.pods` diff --git a/pod/.gitignore b/pod/.gitignore index cd6539f..428d9cf 100644 --- a/pod/.gitignore +++ b/pod/.gitignore @@ -53,7 +53,7 @@ /roffitall # generated -/perl5240delta.pod +/perl5241delta.pod /perlapi.pod /perlintern.pod *.html diff --git a/pod/perl.pod b/pod/perl.pod index 181e7ca..671044e 100644 --- a/pod/perl.pod +++ b/pod/perl.pod @@ -180,6 +180,7 @@ aux c2ph h2ph h2xs perlbug pl2pm pod2html pod2man splain xsubpp perlhist Perl history records perldelta Perl changes since previous version + perl5240delta Perl changes in version 5.24.0 perl5222delta Perl changes in version 5.22.2 perl5221delta Perl changes in version 5.22.1 perl5220delta Perl changes in version 5.22.0 diff --git a/pod/perldelta.pod b/pod/perl5240delta.pod similarity index 99% copy from pod/perldelta.pod copy to pod/perl5240delta.pod index 9a86066..0b0e8bc 100644 --- a/pod/perldelta.pod +++ b/pod/perl5240delta.pod @@ -2,7 +2,7 @@ =head1 NAME -perldelta - what is new for perl v5.24.0 +perl5240delta - what is new for perl v5.24.0 =head1 DESCRIPTION diff --git a/pod/perldelta.pod b/pod/perldelta.pod index 9a86066..929410e 100644 --- a/pod/perldelta.pod +++ b/pod/perldelta.pod @@ -2,2233 +2,103 @@ =head1 NAME -perldelta - what is new for perl v5.24.0 +perldelta - what is new for perl v5.24.1 =head1 DESCRIPTION -This document describes the differences between the 5.22.0 release and the -5.24.0 release. +This document describes differences between the 5.24.0 release and the 5.24.1 +release. -=head1 Core Enhancements +If you are upgrading from an earlier release such as 5.23.0, first read +L<perl5240delta>, which describes differences between 5.23.0 and 5.24.0. -=head2 Postfix dereferencing is no longer experimental - -Using the C<postderef> and C<postderef_qq> features no longer emits a -warning. Existing code that disables the C<experimental::postderef> warning -category that they previously used will continue to work. The C<postderef> -feature has no effect; all Perl code can use postfix dereferencing, -regardless of what feature declarations are in scope. The C<5.24> feature -bundle now includes the C<postderef_qq> feature. - -=head2 Unicode 8.0 is now supported - -For details on what is in this release, see -L<http://www.unicode.org/versions/Unicode8.0.0/>. - -=head2 perl will now croak when closing an in-place output file fails - -Until now, failure to close the output file for an in-place edit was not -detected, meaning that the input file could be clobbered without the edit being -successfully completed. Now, when the output file cannot be closed -successfully, an exception is raised. - -=head2 New C<\b{lb}> boundary in regular expressions - -C<lb> stands for Line Break. It is a Unicode property -that determines where a line of text is suitable to break (typically so -that it can be output without overflowing the available horizontal -space). This capability has long been furnished by the -L<Unicode::LineBreak> module, but now a light-weight, non-customizable -version that is suitable for many purposes is in core Perl. - -=head2 C<qr/(?[ ])/> now works in UTF-8 locales - -L<Extended Bracketed Character Classes|perlrecharclass/Extended Bracketed Character Classes> -now will successfully compile when S<C<use locale>> is in effect. The compiled -pattern will use standard Unicode rules. If the runtime locale is not a -UTF-8 one, a warning is raised and standard Unicode rules are used -anyway. No tainting is done since the outcome does not actually depend -on the locale. - -=head2 Integer shift (C<< << >> and C<< >> >>) now more explicitly defined - -Negative shifts are reverse shifts: left shift becomes right shift, -and right shift becomes left shift. - -Shifting by the number of bits in a native integer (or more) is zero, -except when the "overshift" is right shifting a negative value under -C<use integer>, in which case the result is -1 (arithmetic shift). - -Until now negative shifting and overshifting have been undefined -because they have relied on whatever the C implementation happens -to do. For example, for the overshift a common C behavior is -"modulo shift": - - 1 >> 64 == 1 >> (64 % 64) == 1 >> 0 == 1 # Common C behavior. - - # And the same for <<, while Perl now produces 0 for both. - -Now these behaviors are well-defined under Perl, regardless of what -the underlying C implementation does. Note, however, that you are still -constrained by the native integer width: you need to know how far left you -can go. You can use for example: - - use Config; - my $wordbits = $Config{uvsize} * 8; # Or $Config{uvsize} << 3. - -If you need a more bits on the left shift, you can use for example -the C<bigint> pragma, or the C<Bit::Vector> module from CPAN. - -=head2 printf and sprintf now allow reordered precision arguments - -That is, C<< sprintf '|%.*2$d|', 2, 3 >> now returns C<|002|>. This extends -the existing reordering mechanism (which allows reordering for arguments -that are used as format fields, widths, and vector separators). - -=head2 More fields provided to C<sigaction> callback with C<SA_SIGINFO> - -When passing the C<SA_SIGINFO> flag to L<sigaction|POSIX/sigaction>, the -C<errno>, C<status>, C<uid>, C<pid>, C<addr> and C<band> fields are now -included in the hash passed to the handler, if supported by the -platform. - -=head2 Hashbang redirection to Perl 6 - -Previously perl would redirect to another interpreter if it found a -hashbang path unless the path contains "perl" (see L<perlrun>). To improve -compatability with Perl 6 this behavior has been extended to also redirect -if "perl" is followed by "6". - -=head1 Security - -=head2 Set proper umask before calling C<mkstemp(3)> - -In 5.22 perl started setting umask to 0600 before calling C<mkstemp(3)> -and restoring it afterwards. This wrongfully tells C<open(2)> to strip -the owner read and write bits from the given mode before applying it, -rather than the intended negation of leaving only those bits in place. - -Systems that use mode 0666 in C<mkstemp(3)> (like old versions of -glibc) create a file with permissions 0066, leaving world read and -write permissions regardless of current umask. - -This has been fixed by using umask 0177 instead. [perl #127322] - -=head2 Fix out of boundary access in Win32 path handling - -This is CVE-2015-8608. For more information see -L<[perl #126755]|https://rt.perl.org/Ticket/Display.html?id=126755> - -=head2 Fix loss of taint in canonpath - -This is CVE-2015-8607. For more information see -L<[perl #126862]|https://rt.perl.org/Ticket/Display.html?id=126862> - -=head2 Avoid accessing uninitialized memory in win32 C<crypt()> - -Added validation that will detect both a short salt and invalid characters -in the salt. -L<[perl #126922]|https://rt.perl.org/Ticket/Display.html?id=126922> - -=head2 Remove duplicate environment variables from C<environ> - -Previously, if an environment variable appeared more than once in -C<environ[]>, C<%ENV> would contain the last entry for that name, -while a typical C<getenv()> would return the first entry. We now -make sure C<%ENV> contains the same as what C<getenv> returns. - -Second, we remove duplicates from C<environ[]>, so if a setting -with that name is set in C<%ENV>, we won't pass an unsafe value -to a child process. - -[CVE-2016-2381] - -=head1 Incompatible Changes - -=head2 The C<autoderef> feature has been removed - -The experimental C<autoderef> feature (which allowed calling C<push>, -C<pop>, C<shift>, C<unshift>, C<splice>, C<keys>, C<values>, and C<each> on -a scalar argument) has been deemed unsuccessful. It has now been removed; -trying to use the feature (or to disable the C<experimental::autoderef> -warning it previously triggered) now yields an exception. - -=head2 Lexical $_ has been removed - -C<my $_> was introduced in Perl 5.10, and subsequently caused much confusion -with no obvious solution. In Perl 5.18.0, it was made experimental on the -theory that it would either be removed or redesigned in a less confusing (but -backward-incompatible) way. Over the following years, no alternatives were -proposed. The feature has now been removed and will fail to compile. - -=head2 C<qr/\b{wb}/> is now tailored to Perl expectations - -This is now more suited to be a drop-in replacement for plain C<\b>, but -giving better results for parsing natural language. Previously it -strictly followed the current Unicode rules which calls for it to match -between each white space character. Now it doesn't generally match -within spans of white space, behaving like C<\b> does. See -L<perlrebackslash/\b{wb}> - -=head2 Regular expression compilation errors - -Some regular expression patterns that had runtime errors now -don't compile at all. - -Almost all Unicode properties using the C<\p{}> and C<\P{}> regular -expression pattern constructs are now checked for validity at pattern -compilation time, and invalid ones will cause the program to not -compile. In earlier releases, this check was often deferred until run -time. Whenever an error check is moved from run- to compile time, -erroneous code is caught 100% of the time, whereas before it would only -get caught if and when the offending portion actually gets executed, -which for unreachable code might be never. - -=head2 C<qr/\N{}/> now disallowed under C<use re "strict"> - -An empty C<\N{}> makes no sense, but for backwards compatibility is -accepted as doing nothing, though a deprecation warning is raised by -default. But now this is a fatal error under the experimental feature -L<re/'strict' mode>. - -=head2 Nested declarations are now disallowed - -A C<my>, C<our>, or C<state> declaration is no longer allowed inside -of another C<my>, C<our>, or C<state> declaration. - -For example, these are now fatal: - - my ($x, my($y)); - our (my $x); - -L<[perl #125587]|https://rt.perl.org/Ticket/Display.html?id=125587> - -L<[perl #121058]|https://rt.perl.org/Ticket/Display.html?id=121058> - -=head2 The C</\C/> character class has been removed. - -This regular expression character class was deprecated in v5.20.0 and has -produced a deprecation warning since v5.22.0. It is now a compile-time -error. If you need to examine the individual bytes that make up a -UTF8-encoded character, then use C<utf8::encode()> on the string (or a -copy) first. - -=head2 C<chdir('')> no longer chdirs home - -Using C<chdir('')> or C<chdir(undef)> to chdir home has been deprecated since -perl v5.8, and will now fail. Use C<chdir()> instead. - -=head2 ASCII characters in variable names must now be all visible - -It was legal until now on ASCII platforms for variable names to contain -non-graphical ASCII control characters (ordinals 0 through 31, and 127, -which are the C0 controls and C<DELETE>). This usage has been -deprecated since v5.20, and as of now causes a syntax error. The -variables these names referred to are special, reserved by Perl for -whatever use it may choose, now, or in the future. Each such variable -has an alternative way of spelling it. Instead of the single -non-graphic control character, a two character sequence beginning with a -caret is used, like C<$^]> and C<${^GLOBAL_PHASE}>. Details are at -L<perlvar>. It remains legal, though unwise and deprecated (raising a -deprecation warning), to use certain non-graphic non-ASCII characters in -variables names when not under S<C<use utf8>>. No code should do this, -as all such variables are reserved by Perl, and Perl doesn't currently -define any of them (but could at any time, without notice). - -=head2 An off by one issue in C<$Carp::MaxArgNums> has been fixed - -C<$Carp::MaxArgNums> is supposed to be the number of arguments to display. -Prior to this version, it was instead showing C<$Carp::MaxArgNums> + 1 arguments, -contrary to the documentation. - -=head2 Only blanks and tabs are now allowed within C<[...]> within C<(?[...])>. - -The experimental Extended Bracketed Character Classes can contain regular -bracketed character classes within them. These differ from regular ones in -that white space is generally ignored, unless escaped by preceding it with a -backslash. The white space that is ignored is now limited to just tab C<\t> -and SPACE characters. Previously, it was any white space. See -L<perlrecharclass/Extended Bracketed Character Classes>. - -=head1 Deprecations - -=head2 Using code points above the platform's C<IV_MAX> is now deprecated - -Unicode defines code points in the range C<0..0x10FFFF>. Some standards -at one time defined them up to 2**31 - 1, but Perl has allowed them to -be as high as anything that will fit in a word on the platform being -used. However, use of those above the platform's C<IV_MAX> is broken in -some constructs, notably C<tr///>, regular expression patterns involving -quantifiers, and in some arithmetic and comparison operations, such as -being the upper limit of a loop. Now the use of such code points raises -a deprecation warning, unless that warning category is turned off. -C<IV_MAX> is typically 2**31 -1 on 32-bit platforms, and 2**63-1 on -64-bit ones. - -=head2 Doing bitwise operations on strings containing code points above -0xFF is deprecated - -The string bitwise operators treat their operands as strings of bytes, -and values beyond 0xFF are nonsensical in this context. To operate on -encoded bytes, first encode the strings. To operate on code points' -numeric values, use C<split> and C<map ord>. In the future, this -warning will be replaced by an exception. - -=head2 C<sysread()>, C<syswrite()>, C<recv()> and C<send()> are deprecated on -:utf8 handles - -The C<sysread()>, C<recv()>, C<syswrite()> and C<send()> operators -are deprecated on handles that have the C<:utf8> layer, either -explicitly, or implicitly, eg., with the C<:encoding(UTF-16LE)> layer. - -Both C<sysread()> and C<recv()> currently use only the C<:utf8> flag for the -stream, ignoring the actual layers. Since C<sysread()> and C<recv()> do no -UTF-8 validation they can end up creating invalidly encoded scalars. - -Similarly, C<syswrite()> and C<send()> use only the C<:utf8> flag, otherwise -ignoring any layers. If the flag is set, both write the value UTF-8 -encoded, even if the layer is some different encoding, such as the -example above. - -Ideally, all of these operators would completely ignore the C<:utf8> -state, working only with bytes, but this would result in silently -breaking existing code. To avoid this a future version of perl will -throw an exception when any of C<sysread()>, C<recv()>, C<syswrite()> or C<send()> -are called on handle with the C<:utf8> layer. - -=head1 Performance Enhancements - -=over 4 - -=item * - -The overhead of scope entry and exit has been considerably reduced, so -for example subroutine calls, loops and basic blocks are all faster now. -This empty function call now takes about a third less time to execute: - - sub f{} f(); - -=item * - -Many languages, such as Chinese, are caseless. Perl now knows about -most common ones, and skips much of the work when -a program tries to change case in them (like C<ucfirst()>) or match -caselessly (C<qr//i>). This will speed up a program, such as a web -server, that can operate on multiple languages, while it is operating on a -caseless one. - -=item * - -C</fixed-substr/> has been made much faster. - -On platforms with a libc C<memchr()> implementation which makes good use of -underlying hardware support, patterns which include fixed substrings will now -often be much faster; for example with glibc on a recent x86_64 CPU, this: - - $s = "a" x 1000 . "wxyz"; - $s =~ /wxyz/ for 1..30000 - -is now about 7 times faster. On systems with slow C<memchr()>, e.g. 32-bit ARM -Raspberry Pi, there will be a small or little speedup. Conversely, some -pathological cases, such as C<"ab" x 1000 =~ /aa/> will be slower now; up to 3 -times slower on the rPi, 1.5x slower on x86_64. - -=item * - -Faster addition, subtraction and multiplication. - -Since 5.8.0, arithmetic became slower due to the need to support -64-bit integers. To deal with 64-bit integers, a lot more corner -cases need to be checked, which adds time. We now detect common -cases where there is no need to check for those corner cases, -and special-case them. - -=item * - -Preincrement, predecrement, postincrement, and postdecrement have been -made faster by internally splitting the functions which handled multiple -cases into different functions. - -=item * - -Creating Perl debugger data structures (see L<perldebguts/"Debugger Internals">) -for XSUBs and const subs has been removed. This removed one glob/scalar combo -for each unique C<.c> file that XSUBs and const subs came from. On startup -(C<perl -e"0">) about half a dozen glob/scalar debugger combos were created. -Loading XS modules created more glob/scalar combos. These things were -being created regardless of whether the perl debugger was being used, -and despite the fact that it can't debug C code anyway - -=item * - -On Win32, C<stat>ing or C<-X>ing a path, if the file or directory does not -exist, is now 3.5x faster than before. - -=item * - -Single arguments in list assign are now slightly faster: - - ($x) = (...); - (...) = ($x); - -=item * - -Less peak memory is now used when compiling regular expression patterns. - -=back - -=head1 Modules and Pragmata - -=head2 Updated Modules and Pragmata - -=over - -=item * - -L<arybase> has been upgraded from version 0.10 to 0.11. - -=item * - -L<Attribute::Handlers> has been upgraded from version 0.97 to 0.99. - -=item * - -L<autodie> has been upgraded from version 2.26 to 2.29. - -=item * - -L<autouse> has been upgraded from version 1.08 to 1.11. - -=item * - -L<B> has been upgraded from version 1.58 to 1.62. - -=item * - -L<B::Deparse> has been upgraded from version 1.35 to 1.37. - -=item * - -L<base> has been upgraded from version 2.22 to 2.23. - -=item * - -L<Benchmark> has been upgraded from version 1.2 to 1.22. - -=item * - -L<bignum> has been upgraded from version 0.39 to 0.42. - -=item * - -L<bytes> has been upgraded from version 1.04 to 1.05. - -=item * - -L<Carp> has been upgraded from version 1.36 to 1.40. - -=item * - -L<Compress::Raw::Bzip2> has been upgraded from version 2.068 to 2.069. - -=item * - -L<Compress::Raw::Zlib> has been upgraded from version 2.068 to 2.069. - -=item * - -L<Config::Perl::V> has been upgraded from version 0.24 to 0.25. - -=item * - -L<CPAN::Meta> has been upgraded from version 2.150001 to 2.150005. - -=item * - -L<CPAN::Meta::Requirements> has been upgraded from version 2.132 to 2.140. - -=item * - -L<CPAN::Meta::YAML> has been upgraded from version 0.012 to 0.018. - -=item * - -L<Data::Dumper> has been upgraded from version 2.158 to 2.160. - -=item * - -L<Devel::Peek> has been upgraded from version 1.22 to 1.23. - -=item * - -L<Devel::PPPort> has been upgraded from version 3.31 to 3.32. - -=item * - -L<Dumpvalue> has been upgraded from version 1.17 to 1.18. - -=item * - -L<DynaLoader> has been upgraded from version 1.32 to 1.38. - -=item * - -L<Encode> has been upgraded from version 2.72 to 2.80. - -=item * - -L<encoding> has been upgraded from version 2.14 to 2.17. - -=item * - -L<encoding::warnings> has been upgraded from version 0.11 to 0.12. - -=item * - -L<English> has been upgraded from version 1.09 to 1.10. - -=item * - -L<Errno> has been upgraded from version 1.23 to 1.25. - -=item * - -L<experimental> has been upgraded from version 0.013 to 0.016. - -=item * - -L<ExtUtils::CBuilder> has been upgraded from version 0.280221 to 0.280225. - -=item * - -L<ExtUtils::Embed> has been upgraded from version 1.32 to 1.33. - -=item * - -L<ExtUtils::MakeMaker> has been upgraded from version 7.04_01 to 7.10_01. - -=item * - -L<ExtUtils::ParseXS> has been upgraded from version 3.28 to 3.31. - -=item * - -L<ExtUtils::Typemaps> has been upgraded from version 3.28 to 3.31. - -=item * - -L<feature> has been upgraded from version 1.40 to 1.42. - -=item * - -L<fields> has been upgraded from version 2.17 to 2.23. - -=item * - -L<File::Copy> has been upgraded from version 2.30 to 2.31. - -=item * - -L<File::Find> has been upgraded from version 1.29 to 1.34. - -=item * - -L<File::Glob> has been upgraded from version 1.24 to 1.26. - -=item * - -L<File::Path> has been upgraded from version 2.09 to 2.12_01. - -=item * - -L<File::Spec> has been upgraded from version 3.56 to 3.63. - -=item * - -L<Filter::Util::Call> has been upgraded from version 1.54 to 1.55. - -=item * - -L<Getopt::Long> has been upgraded from version 2.45 to 2.48. - -=item * - -L<Hash::Util> has been upgraded from version 0.18 to 0.19. - -=item * - -L<Hash::Util::FieldHash> has been upgraded from version 1.15 to 1.19. - -=item * - -L<HTTP::Tiny> has been upgraded from version 0.054 to 0.056. - -=item * - -L<I18N::Langinfo> has been upgraded from version 0.12 to 0.13. - -=item * - -L<if> has been upgraded from version 0.0604 to 0.0606. - -=item * - -L<IO> has been upgraded from version 1.35 to 1.36. - -=item * - -IO-Compress has been upgraded from version 2.068 to 2.069. - -=item * - -L<IPC::Open3> has been upgraded from version 1.18 to 1.20. - -=item * - -L<IPC::SysV> has been upgraded from version 2.04 to 2.06_01. - -=item * - -L<List::Util> has been upgraded from version 1.41 to 1.42_02. - -=item * - -L<locale> has been upgraded from version 1.06 to 1.08. - -=item * - -L<Locale::Codes> has been upgraded from version 3.34 to 3.37. - -=item * - -L<Math::BigInt> has been upgraded from version 1.9997 to 1.999715. - -=item * - -L<Math::BigInt::FastCalc> has been upgraded from version 0.31 to 0.40. - -=item * - -L<Math::BigRat> has been upgraded from version 0.2608 to 0.260802. - -=item * - -L<Module::CoreList> has been upgraded from version 5.20150520 to 5.20160506. - -=item * - -L<Module::Metadata> has been upgraded from version 1.000026 to 1.000031. - -=item * - -L<mro> has been upgraded from version 1.17 to 1.18. - -=item * - -L<ODBM_File> has been upgraded from version 1.12 to 1.14. - -=item * - -L<Opcode> has been upgraded from version 1.32 to 1.34. - -=item * - -L<parent> has been upgraded from version 0.232 to 0.234. - -=item * - -L<Parse::CPAN::Meta> has been upgraded from version 1.4414 to 1.4417. - -=item * - -L<Perl::OSType> has been upgraded from version 1.008 to 1.009. - -=item * - -L<perlfaq> has been upgraded from version 5.021009 to 5.021010. - -=item * - -L<PerlIO::encoding> has been upgraded from version 0.21 to 0.24. - -=item * - -L<PerlIO::mmap> has been upgraded from version 0.014 to 0.016. - -=item * - -L<PerlIO::scalar> has been upgraded from version 0.22 to 0.24. - -=item * - -L<PerlIO::via> has been upgraded from version 0.15 to 0.16. - -=item * - -podlators has been upgraded from version 2.28 to 4.07. - -=item * - -L<Pod::Functions> has been upgraded from version 1.09 to 1.10. - -=item * - -L<Pod::Perldoc> has been upgraded from version 3.25 to 3.25_02. - -=item * - -L<Pod::Simple> has been upgraded from version 3.29 to 3.32. - -=item * - -L<Pod::Usage> has been upgraded from version 1.64 to 1.68. - -=item * - -L<POSIX> has been upgraded from version 1.53 to 1.65. - -=item * - -L<Scalar::Util> has been upgraded from version 1.41 to 1.42_02. - -=item * - -L<SDBM_File> has been upgraded from version 1.13 to 1.14. - -=item * - -L<SelfLoader> has been upgraded from version 1.22 to 1.23. - -=item * - -L<Socket> has been upgraded from version 2.018 to 2.020_03. - -=item * - -L<Storable> has been upgraded from version 2.53 to 2.56. - -=item * - -L<strict> has been upgraded from version 1.09 to 1.11. - -=item * - -L<Term::ANSIColor> has been upgraded from version 4.03 to 4.04. - -=item * - -L<Term::Cap> has been upgraded from version 1.15 to 1.17. - -=item * - -L<Test> has been upgraded from version 1.26 to 1.28. - -=item * - -L<Test::Harness> has been upgraded from version 3.35 to 3.36. - -=item * - -L<Thread::Queue> has been upgraded from version 3.05 to 3.09. - -=item * - -L<threads> has been upgraded from version 2.01 to 2.07. - -=item * - -L<threads::shared> has been upgraded from version 1.48 to 1.51. - -=item * - -L<Tie::File> has been upgraded from version 1.01 to 1.02. - -=item * - -L<Tie::Scalar> has been upgraded from version 1.03 to 1.04. - -=item * - -L<Time::HiRes> has been upgraded from version 1.9726 to 1.9733. - -=item * - -L<Time::Piece> has been upgraded from version 1.29 to 1.31. - -=item * - -L<Unicode::Collate> has been upgraded from version 1.12 to 1.14. - -=item * - -L<Unicode::Normalize> has been upgraded from version 1.18 to 1.25. - -=item * - -L<Unicode::UCD> has been upgraded from version 0.61 to 0.64. - -=item * - -L<UNIVERSAL> has been upgraded from version 1.12 to 1.13. - -=item * - -L<utf8> has been upgraded from version 1.17 to 1.19. - -=item * - -L<version> has been upgraded from version 0.9909 to 0.9916. - -=item * - -L<warnings> has been upgraded from version 1.32 to 1.36. - -=item * - -L<Win32> has been upgraded from version 0.51 to 0.52. - -=item * - -L<Win32API::File> has been upgraded from version 0.1202 to 0.1203. - -=item * - -L<XS::Typemap> has been upgraded from version 0.13 to 0.14. - -=item * - -L<XSLoader> has been upgraded from version 0.20 to 0.21. - -=back - -=head1 Documentation - -=head2 Changes to Existing Documentation - -=head3 L<perlapi> - -=over 4 - -=item * - -The process of using undocumented globals has been documented, namely, that one -should send email to L<[email protected]|mailto:[email protected]> -first to get the go-ahead for documenting and using an undocumented function or -global variable. - -=back - -=head3 L<perlcall> - -=over 4 - -=item * - -A number of cleanups have been made to perlcall, including: - -=over 4 - -=item * - -use C<EXTEND(SP, n)> and C<PUSHs()> instead of C<XPUSHs()> where applicable -and update prose to match - -=item * - -add POPu, POPul and POPpbytex to the "complete list of POP macros" -and clarify the documentation for some of the existing entries, and -a note about side-effects - -=item * - -add API documentation for POPu and POPul - -=item * - -use ERRSV more efficiently - -=item * - -approaches to thread-safety storage of SVs. - -=back - -=back - -=head3 L<perlfunc> - -=over 4 - -=item * - -The documentation of C<hex> has been revised to clarify valid inputs. - -=item * - -Better explain meaning of negative PIDs in C<waitpid>. -L<[perl #127080]|https://rt.perl.org/Ticket/Display.html?id=127080> - -=item * - -General cleanup: there's more consistency now (in POD usage, grammar, code -examples), better practices in code examples (use of C<my>, removal of bareword -filehandles, dropped usage of C<&> when calling subroutines, ...), etc. - -=back - -=head3 L<perlguts> - -=over 4 - -=item * - -A new section has been added, L<perlguts/"Dynamic Scope and the Context -Stack">, which explains how the perl context stack works. - -=back - -=head3 L<perllocale> - -=over 4 - -=item * - -A stronger caution about using locales in threaded applications is -given. Locales are not thread-safe, and you can get wrong results or -even segfaults if you use them there. - -=back - -=head3 L<perlmodlib> - -=over 4 - -=item * - -We now recommend contacting the module-authors list or PAUSE in seeking -guidance on the naming of modules. - -=back - -=head3 L<perlop> - -=over 4 - -=item * - -The documentation of C<qx//> now describes how C<$?> is affected. - -=back - -=head3 L<perlpolicy> - -=over 4 - -=item * - -This note has been added to perlpolicy: - - While civility is required, kindness is encouraged; if you have any - doubt about whether you are being civil, simply ask yourself, "Am I - being kind?" and aspire to that. - -=back - -=head3 L<perlreftut> - -=over 4 - -=item * - -Fix some examples to be L<strict> clean. - -=back - -=head3 L<perlrebackslash> - -=over 4 - -=item * - -Clarify that in languages like Japanese and Thai, dictionary lookup -is required to determine word boundaries. - -=back - -=head3 L<perlsub> - -=over 4 - -=item * - -Updated to note that anonymous subroutines can have signatures. - -=back - -=head3 L<perlsyn> - -=over 4 - -=item * - -Fixed a broken example where C<=> was used instead of -C<==> in conditional in do/while example. - -=back - -=head3 L<perltie> - -=over 4 - -=item * - -The usage of C<FIRSTKEY> and C<NEXTKEY> has been clarified. - -=back - -=head3 L<perlunicode> - -=over 4 - -=item * - -Discourage use of 'In' as a prefix signifying the Unicode Block property. - -=back - -=head3 L<perlvar> - -=over 4 - -=item * - -The documentation of C<$@> was reworded to clarify that it is not just for -syntax errors in C<eval>. -L<[perl #124034]|https://rt.perl.org/Ticket/Display.html?id=124034> - -=item * - -The specific true value of C<$!{E...}> is now documented, noting that it is -subject to change and not guaranteed. - -=item * - -Use of C<$OLD_PERL_VERSION> is now discouraged. - -=back - -=head3 L<perlxs> - -=over 4 - -=item * - -The documentation of C<PROTOTYPES> has been corrected; they are I<disabled> -by default, not I<enabled>. - -=back - -=head1 Diagnostics - -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 L<perldiag>. - -=head2 New Diagnostics - -=head3 New Errors - -=over 4 - -=item * - -L<%s must not be a named sequence in transliteration operator|perldiag/"%s must not be a named sequence in transliteration operator"> - -=item * - -L<Can't find Unicode property definition "%s" in regex;|perldiag/"Can't find Unicode property definition "%s" in regex; marked by <-- HERE in m/%s/"> - -=item * - -L<Can't redeclare "%s" in "%s"|perldiag/"Can't redeclare "%s" in "%s""> - -=item * - -L<Character following \p must be '{' or a single-character Unicode property name in regex;|perldiag/"Character following \%c must be '{' or a single-character Unicode property name in regex; marked b ... [21 chars truncated] - -=item * - -L<Empty \%c in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol> -|perldiag/"Empty \%c in regex; marked by <-- HERE in mE<sol>%sE<sol>"> - -=item * - -L<Illegal user-defined property name|perldiag/"Illegal user-defined property name"> - -=item * - -L<Invalid number '%s' for -C option.|perldiag/"Invalid number '%s' for -C option."> - -=item * - -L<<< Sequence (?... not terminated in regex; marked by S<<-- HERE> in mE<sol>%sE<sol>|perldiag/"Sequence (?... not terminated in regex; marked by <-- HERE in mE<sol>%sE<sol>" >>> - -=item * - -L<<< Sequence (?PE<lt>... not terminated in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol> -|perldiag/"Sequence (?PE<lt>... not terminated in regex; marked by <-- HERE in mE<sol>%sE<sol>" >>> - -=item * - -L<Sequence (?PE<gt>... not terminated in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol> -|perldiag/"Sequence (?PE<gt>... not terminated in regex; marked by <-- HERE in mE<sol>%sE<sol>"> - -=back - -=head3 New Warnings - -=over 4 - -=item * - -L<Assuming NOT a POSIX class since %s in regex; marked by E<lt>-- HERE in mE<sol>%sE<sol>| -perldiag/Assuming NOT a POSIX class since %s in regex; marked by <-- HERE in mE<sol>%sE<sol>> - -=item * - -L<%s() is deprecated on :utf8 handles|perldiag/"%s() is deprecated on :utf8 handles"> - -=back - -=head2 Changes to Existing Diagnostics - -=over 4 - -=item * - -Accessing the C<IO> part of a glob as C<FILEHANDLE> instead of C<IO> is no -longer deprecated. It is discouraged to encourage uniformity (so that, for -example, one can grep more easily) but it will not be removed. -L<[perl #127060]|https://rt.perl.org/Ticket/Display.html?id=127060> - -=item * - -The diagnostic C<< Hexadecimal float: internal error >> has been changed to -C<< Hexadecimal float: internal error (%s) >> to include more information. - -=item * - -L<Can't modify non-lvalue subroutine call of &%s|perldiag/"Can't modify non-lvalue subroutine call of &%s"> - -This error now reports the name of the non-lvalue subroutine you attempted to -use as an lvalue. - -=item * - -When running out of memory during an attempt the increase the stack -size, previously, perl would die using the cryptic message -C<< panic: av_extend_guts() negative count (-9223372036854775681) >>. -This has been fixed to show the prettier message: -L<< Out of memory during stack extend|perldiag/"Out of memory during %s extend" >> - -=back - -=head1 Configuration and Compilation - -=over 4 - -=item * - -C<Configure> now acts as if the C<-O> option is always passed, allowing command -line options to override saved configuration. This should eliminate confusion -when command line options are ignored for no obvious reason. C<-O> is now -permitted, but ignored. - -=item * - -Bison 3.0 is now supported. - -=item * - -F<Configure> no longer probes for F<libnm> by default. Originally -this was the "New Math" library, but the name has been re-used by the -GNOME NetworkManager. -L<[perl #127131]|https://rt.perl.org/Ticket/Display.html?id=127131> - -=item * - -Added F<Configure> probes for C<newlocale>, C<freelocale>, and C<uselocale>. - -=item * - -C<< PPPort.so/PPPort.dll >> no longer get installed, as they are -not used by C<< PPPort.pm >>, only by its test files. - -=item * - -It is now possible to specify which compilation date to show on -C<< perl -V >> output, by setting the macro C<< PERL_BUILD_DATE >>. - -=item * - -Using the C<NO_HASH_SEED> define in combination with the default hash algorithm -C<PERL_HASH_FUNC_ONE_AT_A_TIME_HARD> resulted in a fatal error while compiling -the interpreter, since Perl 5.17.10. This has been fixed. - -=item * - -F<Configure> should handle spaces in paths a little better. - -=item * - -No longer generate EBCDIC POSIX-BC tables. We don't believe anyone is -using Perl and POSIX-BC at this time, and by not generating these tables -it saves time during development, and makes the resulting tar ball smaller. - -=item * - -The GNU Make makefile for Win32 now supports parallel builds. [perl #126632] - -=item * - -You can now build perl with MSVC++ on Win32 using GNU Make. [perl #126632] - -=item * - -The Win32 miniperl now has a real C<getcwd> which increases build performance -resulting in C<getcwd()> being 605x faster in Win32 miniperl. - -=item * - -Configure now takes C<-Dusequadmath> into account when calculating the -C<alignbytes> configuration variable. Previously the mis-calculated -C<alignbytes> could cause alignment errors on debugging builds. [perl -#127894] - -=back - -=head1 Testing - -=over 4 - -=item * - -A new test (F<t/op/aassign.t>) has been added to test the list assignment operator -C<OP_AASSIGN>. - -=item * - -Parallel building has been added to the dmake C<makefile.mk> makefile. All -Win32 compilers are supported. - -=back - -=head1 Platform Support - -=head2 Platform-Specific Notes - -=over 4 - -=item AmigaOS - -=over 4 - -=item * - -The AmigaOS port has been reintegrated into the main tree, based off of -Perl 5.22.1. - -=back - -=item Cygwin - -=over 4 - -=item * - -Tests are more robust against unusual cygdrive prefixes. -L<[perl #126834]|https://rt.perl.org/Ticket/Display.html?id=126834> - -=back - -=item EBCDIC - -=over 4 - -=item UTF-EBCDIC extended - -UTF-EBCDIC is like UTF-8, but for EBCDIC platforms. It now has been -extended so that it can represent code points up to 2 ** 64 - 1 on -platforms with 64-bit words. This brings it into parity with UTF-8. -This enhancement requires an incompatible change to the representation -of code points in the range 2 ** 30 to 2 ** 31 -1 (the latter was the -previous maximum representable code point). This means that a file that -contains one of these code points, written out with previous versions of -perl cannot be read in, without conversion, by a perl containing this -change. We do not believe any such files are in existence, but if you -do have one, submit a ticket at L<[email protected]|mailto:[email protected]>, -and we will write a conversion script for you. - -=item EBCDIC C<cmp()> and C<sort()> fixed for UTF-EBCDIC strings - -Comparing two strings that were both encoded in UTF-8 (or more -precisely, UTF-EBCDIC) did not work properly until now. Since C<sort()> -uses C<cmp()>, this fixes that as well. - -=item EBCDIC C<tr///> and C<y///> fixed for C<\N{}>, and C<S<use utf8>> ranges - -Perl v5.22 introduced the concept of portable ranges to regular -expression patterns. A portable range matches the same set of -characters no matter what platform is being run on. This concept is now -extended to C<tr///>. See -C<L<trE<sol>E<sol>E<sol>|perlop/trE<sol>SEARCHLISTE<sol>REPLACEMENTLISTE<sol>cdsr>>. - -There were also some problems with these operations under S<C<use -utf8>>, which are now fixed - -=back - -=item FreeBSD - -=over 4 - -=item * - -Use the C<fdclose()> function from FreeBSD if it is available. -L<[perl #126847]|https://rt.perl.org/Ticket/Display.html?id=126847> - -=back - -=item IRIX - -=over 4 - -=item * - -Under some circumstances IRIX stdio C<fgetc()> and C<fread()> set the errno to -C<ENOENT>, which made no sense according to either IRIX or POSIX docs. Errno -is now cleared in such cases. -L<[perl #123977]|https://rt.perl.org/Ticket/Display.html?id=123977> - -=item * - -Problems when multiplying long doubles by infinity have been fixed. -L<[perl #126396]|https://rt.perl.org/Ticket/Display.html?id=126396> - -=back - -=item MacOS X - -=over 4 - -=item * - -Until now OS X builds of perl have specified a link target of 10.3 (Panther, -2003) but have not specified a compiler target. From now on, builds of perl on -OS X 10.6 or later (Snow Leopard, 2008) by default capture the current OS X -version and specify that as the explicit build target in both compiler and -linker flags, thus preserving binary compatibility for extensions built later -regardless of changes in OS X, SDK, or compiler and linker versions. To -override the default value used in the build and preserved in the flags, -specify C<export MACOSX_DEPLOYMENT_TARGET=10.N> before configuring and building -perl, where 10.N is the version of OS X you wish to target. In OS X 10.5 or -earlier there is no change to the behavior present when those systems were -current; the link target is still OS X 10.3 and there is no explicit compiler -target. - -=item * - -Builds with both -DDEBUGGING and threading enabled would fail with a -"panic: free from wrong pool" error when built or tested from Terminal -on OS X. This was caused by perl's internal management of the -environment conflicting with an atfork handler using the libc -C<setenv()> function to update the environment. - -Perl now uses C<setenv()>/C<unsetenv()> to update the environment on OS X. -L<[perl #126240]|https://rt.perl.org/Ticket/Display.html?id=126240> - -=back - -=item Solaris - -=over 4 - -=item * - -All Solaris variants now build a shared libperl - -Solaris and variants like OpenIndiana now always build with the shared -Perl library (Configure -Duseshrplib). This was required for the -OpenIndiana builds, but this has also been the setting for Oracle/Sun -Perl builds for several years. - -=back - -=item Tru64 - -=over 4 - -=item * - -Workaround where Tru64 balks when prototypes are listed as -C<< PERL_STATIC_INLINE >>, but where the test is build with -C<< -DPERL_NO_INLINE_FUNCTIONS >>. - -=back - -=item VMS - -=over 4 - -=item * - -On VMS, the math function prototypes in C<math.h> are now visible under C++. -Now building the POSIX extension with C++ will no longer crash. - -=item * - -VMS has had C<setenv>/C<unsetenv> since v7.0 (released in 1996), -C<Perl_vmssetenv> now always uses C<setenv>/C<unsetenv>. - -=item * - -Perl now implements its own C<killpg> by scanning for processes in the -specified process group, which may not mean exactly the same thing as a Unix -process group, but allows us to send a signal to a parent (or master) process -and all of its sub-processes. At the perl level, this means we can now send a -negative pid like so: - - kill SIGKILL, -$pid; - -to signal all processes in the same group as C<$pid>. - -=item * - -For those C<%ENV> elements based on the CRTL environ array, we've always -preserved case when setting them but did look-ups only after upcasing the -key first, which made lower- or mixed-case entries go missing. This problem -has been corrected by making C<%ENV> elements derived from the environ array -case-sensitive on look-up as well as case-preserving on store. - -=item * - -Environment look-ups for C<PERL5LIB> and C<PERLLIB> previously only -considered logical names, but now consider all sources of C<%ENV> as -determined by C<PERL_ENV_TABLES> and as documented in L<perlvms/%ENV>. - -=item * - -The minimum supported version of VMS is now v7.3-2, released in 2003. As a -side effect of this change, VAX is no longer supported as the terminal -release of OpenVMS VAX was v7.3 in 2001. - -=back - -=item Win32 - -=over 4 - -=item * - -A new build option C<USE_NO_REGISTRY> has been added to the makefiles. This -option is off by default, meaning the default is to do Windows registry -lookups. This option stops Perl from looking inside the registry for anything. -For what values are looked up in the registry see L<perlwin32>. Internally, in -C, the name of this option is C<WIN32_NO_REGISTRY>. - -=item * - -The behavior of Perl using C<HKEY_CURRENT_USER\Software\Perl> and -C<HKEY_LOCAL_MACHINE\Software\Perl> to lookup certain values, including C<%ENV> -vars starting with C<PERL> has changed. Previously, the 2 keys were checked -for entries at all times through the perl process's life time even if -they did not -exist. For performance reasons, now, if the root key (i.e. -C<HKEY_CURRENT_USER\Software\Perl> or C<HKEY_LOCAL_MACHINE\Software\Perl>) does -not exist at process start time, it will not be checked again for C<%ENV> -override entries for the remainder of the perl process's life. This more -closely matches Unix behavior in that the environment is copied or inherited -on startup and changing the variable in the parent process or another process -or editing F<.bashrc> will not change the environmental variable in other -existing, running, processes. - -=item * - -One glob fetch was removed for each C<-X> or C<stat> call whether done from -Perl code or internally from Perl's C code. The glob being looked up was -C<${^WIN32_SLOPPY_STAT}> which is a special variable. This makes C<-X> and -C<stat> slightly faster. - -=item * - -During miniperl's process startup, during the build process, 4 to 8 IO calls -related to the process starting F<.pl> and the F<buildcustomize.pl> file were -removed from the code opening and executing the first 1 or 2 F<.pl> files. - -=item * - -Builds using Microsoft Visual C++ 2003 and earlier no longer produce -an "INTERNAL COMPILER ERROR" message. [perl #126045] - -=item * - -Visual C++ 2013 builds will now execute on XP and higher. Previously they would -only execute on Vista and higher. - -=item * - -You can now build perl with GNU Make and GCC. [perl #123440] - -=item * - -C<truncate($filename, $size)> now works for files over 4GB in size. -[perl #125347] - -=item * - -Parallel building has been added to the dmake C<makefile.mk> makefile. All -Win32 compilers are supported. - -=item * - -Building a 64-bit perl with a 64-bit GCC but a 32-bit gmake would -result in an invalid C<$Config{archname}> for the resulting perl. -[perl #127584] - -=item * - -Errors set by Winsock functions are now put directly into C<$^E>, and the -relevant C<WSAE*> error codes are now exported from the L<Errno> and L<POSIX> -modules for testing this against. - -The previous behavior of putting the errors (converted to POSIX-style C<E*> -error codes since Perl 5.20.0) into C<$!> was buggy due to the non-equivalence -of like-named Winsock and POSIX error constants, a relationship between which -has unfortunately been established in one way or another since Perl 5.8.0. - -The new behavior provides a much more robust solution for checking Winsock -errors in portable software without accidentally matching POSIX tests that were -intended for other OSes and may have different meanings for Winsock. - -The old behavior is currently retained, warts and all, for backwards -compatibility, but users are encouraged to change any code that tests C<$!> -against C<E*> constants for Winsock errors to instead test C<$^E> against -C<WSAE*> constants. After a suitable deprecation period, the old behavior may -be removed, leaving C<$!> unchanged after Winsock function calls, to avoid any -possible confusion over which error variable to check. - -=back - -=item ppc64el - -=over 4 - -=item floating point - -The floating point format of ppc64el (Debian naming for little-endian -PowerPC) is now detected correctly. - -=back - -=back - -=head1 Internal Changes - -=over 4 - -=item * - -The implementation of perl's context stack system, and its internal API, -have been heavily reworked. Note that no significant changes have been -made to any external APIs, but XS code which relies on such internal -details may need to be fixed. The main changes are: - -=over 4 - -=item * - -The C<PUSHBLOCK()>, C<POPSUB()> etc. macros have been replaced with static -inline functions such as C<cx_pushblock()>, C<cx_popsub()> etc. These use -function args rather than implicitly relying on local vars such as -C<gimme> and C<newsp> being available. Also their functionality has -changed: in particular, C<cx_popblock()> no longer decrements -C<cxstack_ix>. The ordering of the steps in the C<pp_leave*> functions -involving C<cx_popblock()>, C<cx_popsub()> etc. has changed. See the new -documentation, L<perlguts/"Dynamic Scope and the Context Stack">, for -details on how to use them. - -=item * - -Various macros, which now consistently have a CX_ prefix, have been added: - - CX_CUR(), CX_LEAVE_SCOPE(), CX_POP() - -or renamed: - - CX_POP_SAVEARRAY(), CX_DEBUG(), CX_PUSHSUBST(), CX_POPSUBST() - -=item * - -C<cx_pushblock()> now saves C<PL_savestack_ix> and C<PL_tmps_floor>, so -C<pp_enter*> and C<pp_leave*> no longer do - - ENTER; SAVETMPS; ....; LEAVE - -=item * - -C<cx_popblock()> now also restores C<PL_curpm>. - -=item * - -In C<dounwind()> for every context type, the current savestack frame is -now processed before each context is popped; formerly this was only done -for sub-like context frames. This action has been removed from -C<cx_popsub()> and placed into its own macro, C<CX_LEAVE_SCOPE(cx)>, which -must be called before C<cx_popsub()> etc. - -C<dounwind()> now also does a C<cx_popblock()> on the last popped frame -(formerly it only did the C<cx_popsub()> etc. actions on each frame). - -=item * - -The temps stack is now freed on scope exit; previously, temps created -during the last statement of a block wouldn't be freed until the next -C<nextstate> following the block (apart from an existing hack that did -this for recursive subs in scalar context); and in something like -C<f(g())>, the temps created by the last statement in C<g()> would -formerly not be freed until the statement following the return from -C<f()>. +=head1 Security -=item * +=head2 C<-Di> switch is now required for PerlIO debugging output -Most values that were saved on the savestack on scope entry are now -saved in suitable new fields in the context struct, and saved and -restored directly by C<cx_pushfoo()> and C<cx_popfoo()>, which is much -faster. +Previously PerlIO debugging output would be sent to the file specified +by the C<PERLIO_DEBUG> environment variable if perl wasn't running +setuid and the C<-T> or C<-t> switches hadn't been parsed yet. -=item * +If perl performed output at a point where it hadn't yet parsed its +switches this could result in perl creating or overwriting the file +named by C<PERLIO_DEBUG> even when the C<-T> switch had been supplied. -Various context struct fields have been added, removed or modified. +Perl now requires the C<-Di> switch to produce PerlIO debugging +output. By default this is written to C<stderr>, but can optionally +be redirected to a file by setting the C<PERLIO_DEBUG> environment +variable. -=item * +If perl is running setuid or the C<-T> switch was supplied +C<PERLIO_DEBUG> is ignored and the debugging output is sent to +C<stderr> as for any other C<-D> switch. -The handling of C<@_> in C<cx_pushsub()> and C<cx_popsub()> has been -considerably tidied up, including removing the C<argarray> field from the -context struct, and extracting out some common (but rarely used) code into -a separate function, C<clear_defarray()>. Also, useful subsets of -C<cx_popsub()> which had been unrolled in places like C<pp_goto> have been -gathered into the new functions C<cx_popsub_args()> and -C<cx_popsub_common()>. +=head1 Incompatible Changes -=item * +There are no changes intentionally incompatible with 5.24.0. +If any exist, they are bugs, and we request that you submit a +report. See L</Reporting Bugs> below. -C<pp_leavesub> and C<pp_leavesublv> now use the same function as the rest -of the C<pp_leave*>'s to process return args. +=head1 Modules and Pragmata -=item * +=head2 Updated Modules and Pragmata -C<CXp_FOR_PAD> and C<CXp_FOR_GV> flags have been added, and -C<CXt_LOOP_FOR> has been split into C<CXt_LOOP_LIST>, C<CXt_LOOP_ARY>. +=over 4 =item * -Some variables formerly declared by C<dMULTICALL> (but not documented) have -been removed. +L<Module::CoreList> has been upgraded from version 5.20160506 to 5.20160730. =back -=item * - -The obscure C<PL_timesbuf> variable, effectively a vestige of Perl 1, has -been removed. It was documented as deprecated in Perl 5.20, with a statement -that it would be removed early in the 5.21.x series; that has now finally -happened. -L<[perl #121351]|https://rt.perl.org/Ticket/Display.html?id=121351> - -=item * - -An unwarranted assertion in C<Perl_newATTRSUB_x()> has been removed. If -a stub subroutine -definition with a prototype has been seen, then any subsequent stub (or -definition) of the same subroutine with an attribute was causing an assertion -failure because of a null pointer. -L<[perl #126845]|https://rt.perl.org/Ticket/Display.html?id=126845> - -=item * - -C<::> has been replaced by C<__> in C<ExtUtils::ParseXS>, like it's done for -parameters/return values. This is more consistent, and simplifies writing XS -code wrapping C++ classes into a nested Perl namespace (it requires only -a typedef for C<Foo__Bar> rather than two, one for C<Foo_Bar> and the other -for C<Foo::Bar>). - -=item * - -The C<to_utf8_case()> function is now deprecated. Instead use -C<toUPPER_utf8>, C<toTITLE_utf8>, C<toLOWER_utf8>, and C<toFOLD_utf8>. -(See L<http://nntp.perl.org/group/perl.perl5.porters/233287>.) - -=item * - -Perl core code and the threads extension have been annotated so that, -if Perl is configured to use threads, then during compile-time clang (3.6 -or later) will warn about suspicious uses of mutexes. -See L<http://clang.llvm.org/docs/ThreadSafetyAnalysis.html> for more -information. - -=item * - -The C<signbit()> emulation has been enhanced. This will help older -and/or more exotic platforms or configurations. - - -=item * - -Most EBCDIC-specific code in the core has been unified with non-EBCDIC -code, to avoid repetition and make maintenance easier. - -=item * - -MSWin32 code for C<$^X> has been moved out of the F<win32> directory to -F<caretx.c>, where other operating systems set that variable. - -=item * - -C<< sv_ref() >> is now part of the API. - -=item * - -L<perlapi/sv_backoff> had its return type changed from C<int> to C<void>. It -previously has always returned C<0> since Perl 5.000 stable but that was -undocumented. Although C<sv_backoff> is marked as public API, XS code is not -expected to be impacted since the proper API call would be through public API -C<sv_setsv(sv, &PL_sv_undef)>, or quasi-public C<SvOOK_off>, or non-public -C<SvOK_off> calls, and the return value of C<sv_backoff> was previously a -meaningless constant that can be rewritten as C<(sv_backoff(sv),0)>. - -=item * - -The C<EXTEND> and C<MEXTEND> macros have been improved to avoid various issues -with integer truncation and wrapping. In particular, some casts formerly used -within the macros have been removed. This means for example that passing an -unsigned C<nitems> argument is likely to raise a compiler warning now -(it's always been documented to require a signed value; formerly int, -lately SSize_t). - -=item * - -C<PL_sawalias> and C<GPf_ALIASED_SV> have been removed. - -=item * - -C<GvASSIGN_GENERATION> and C<GvASSIGN_GENERATION_set> have been removed. +=head1 Documentation -=back +=head2 Changes to Existing Documentation -=head1 Selected Bug Fixes +=head3 L<perlapio> =over 4 =item * -It now works properly to specify a user-defined property, such as - - qr/\p{mypkg1::IsMyProperty}/i - -with C</i> caseless matching, an explicit package name, and -I<IsMyProperty> not defined at the time of the pattern compilation. - -=item * - -Perl's C<memcpy()>, C<memmove()>, C<memset()> and C<memcmp()> fallbacks are now -more compatible with the originals. [perl #127619] - -=item * - -Fixed the issue where a C<< s///r >>) with B<< -DPERL_NO_COW >> attempts -to modify the source SV, resulting in the program dying. [perl #127635] - -=item * - -Fixed an EBCDIC-platform-only case where a pattern could fail to match. This -occurred when matching characters from the set of C1 controls when the -target matched string was in UTF-8. - -=item * - -Narrow the filename check in F<strict.pm> and F<warnings.pm>. Previously, -it assumed that if the filename (without the F<.pmc?> extension) differed -from the package name, if was a misspelled use statement (i.e. C<use Strict> -instead of C<use strict>). We now check whether there's really a -miscapitalization happening, and not some other issue. - -=item * - -Turn an assertion into a more user friendly failure when parsing -regexes. [perl #127599] - -=item * - -Correctly raise an error when trying to compile patterns with -unterminated character classes while there are trailing backslashes. -[perl #126141]. - -=item * - -Line numbers larger than 2**31-1 but less than 2**32 are no longer -returned by C<caller()> as negative numbers. [perl #126991] - -=item * - -C<< unless ( I<assignment> ) >> now properly warns when syntax -warnings are enabled. [perl #127122] - -=item * - -Setting an C<ISA> glob to an array reference now properly adds -C<isaelem> magic to any existing elements. Previously modifying such -an element would not update the ISA cache, so method calls would call -the wrong function. Perl would also crash if the C<ISA> glob was -destroyed, since new code added in 5.23.7 would try to release the -C<isaelem> magic from the elements. [perl #127351] - -=item * - -If a here-doc was found while parsing another operator, the parser had -already read end of file, and the here-doc was not terminated, perl -could produce an assertion or a segmentation fault. This now reliably -complains about the unterminated here-doc. [perl #125540] - -=item * - -C<untie()> would sometimes return the last value returned by the C<UNTIE()> -handler as well as it's normal value, messing up the stack. [perl -#126621] - -=item * - -Fixed an operator precedence problem when C< castflags & 2> is true. -[perl #127474] - -=item * - -Caching of DESTROY methods could result in a non-pointer or a -non-STASH stored in the C<SvSTASH()> slot of a stash, breaking the B -C<STASH()> method. The DESTROY method is now cached in the MRO metadata -for the stash. [perl #126410] - -=item * - -The AUTOLOAD method is now called when searching for a DESTROY method, -and correctly sets C<$AUTOLOAD> too. [perl #124387] [perl #127494] - -=item * - -Avoid parsing beyond the end of the buffer when processing a C<#line> -directive with no filename. [perl #127334] - -=item * - -Perl now raises a warning when a regular expression pattern looks like -it was supposed to contain a POSIX class, like C<qr/[[:alpha:]]/>, but -there was some slight defect in its specification which causes it to -instead be treated as a regular bracketed character class. An example -would be missing the second colon in the above like this: -C<qr/[[:alpha]]/>. This compiles to match a sequence of two characters. -The second is C<"]">, and the first is any of: C<"[">, C<":">, C<"a">, -C<"h">, C<"l">, or C<"p">. This is unlikely to be the intended -meaning, and now a warning is raised. No warning is raised unless the -specification is very close to one of the 14 legal POSIX classes. (See -L<perlrecharclass/POSIX Character Classes>.) -[perl #8904] - -=item * - -Certain regex patterns involving a complemented POSIX class in an -inverted bracketed character class, and matching something else -optionally would improperly fail to match. An example of one that could -fail is C<qr/_?[^\Wbar]\x{100}/>. This has been fixed. -[perl #127537] - -=item * - -Perl 5.22 added support to the C99 hexadecimal floating point notation, -but sometimes misparses hex floats. This has been fixed. -[perl #127183] - -=item * - -A regression that allowed undeclared barewords in hash keys to work despite -strictures has been fixed. -L<[perl #126981]|https://rt.perl.org/Ticket/Display.html?id=126981> - -=item * - -Calls to the placeholder C<&PL_sv_yes> used internally when an C<import()> -or C<unimport()> method isn't found now correctly handle scalar context. -L<[perl #126042]|https://rt.perl.org/Ticket/Display.html?id=126042> - -=item * - -Report more context when we see an array where we expect to see an -operator and avoid an assertion failure. -L<[perl #123737]|https://rt.perl.org/Ticket/Display.html?id=123737> - -=item * - -Modifying an array that was previously a package C<@ISA> no longer -causes assertion failures or crashes. -L<[perl #123788]|https://rt.perl.org/Ticket/Display.html?id=123788> - -=item * - -Retain binary compatibility across plain and DEBUGGING perl builds. -L<[perl #127212]|https://rt.perl.org/Ticket/Display.html?id=127212> **** PATCH TRUNCATED AT 2000 LINES -- 475 NOT SHOWN **** -- Perl5 Master Repository
