=head1 NAME
-[ this is a template for a new perldelta file. Any text flagged as XXX needs
-to be processed before release. ]
-
-perldelta - what is new for perl v5.27.7
+perldelta - what is new for perl v5.27.8
=head1 DESCRIPTION
-This document describes differences between the 5.27.6 release and the 5.27.7
+This document describes differences between the 5.27.7 release and the 5.27.8
release.
-If you are upgrading from an earlier release such as 5.27.5, first read
-L<perl5276delta>, which describes differences between 5.27.5 and 5.27.6.
-
-=head1 Notice
-
-XXX Any important notices here
+If you are upgrading from an earlier release such as 5.27.6, first read
+L<perl5277delta>, which describes differences between 5.27.6 and 5.27.7.
=head1 Core Enhancements
-XXX New core language features go here. Summarize user-visible core language
-enhancements. Particularly prominent performance optimisations could go
-here, but most should go in the L</Performance Enhancements> section.
+=head2 Close-on-exec flag set atomically
-[ List each enhancement as a =head2 entry ]
+When opening a file descriptor, perl now generally opens it with its
+close-on-exec flag already set, on platforms that support doing so.
+This improves thread safety, because it means that an C<exec> initiated
+by one thread can no longer cause a file descriptor in the process
+of being opened by another thread to be accidentally passed to the
+executed program.
-=head2 The C<sprintf> C<%j> format size modifier is now available with
-pre-C99 compilers
+Additionally, perl now sets the close-on-exec flag more reliably, whether
+it does so atomically or not. Most file descriptors were getting the
+flag set, but some were being missed.
-The actual size used depends on the platform, so remains unportable.
+=head2 Mixed Unicode scripts are now detectable
-=head1 Security
+A mixture of scripts, such as Cyrillic and Latin, in a string is often
+the sign of a spoofing attack. A new regular expression construct
+now allows for easy detection of these. For example, you can say
-XXX Any security-related notices go here. In particular, any security
-vulnerabilities closed should be noted here rather than in the
-L</Selected Bug Fixes> section.
-
-[ List each security issue as a =head2 entry ]
-
-=head1 Incompatible Changes
+ qr/(?script_run: \d+ \b )/x
-XXX For a release on a stable branch, this section aspires to be:
+And the digits matched will all be from the same set of 10. You won't
+get a look-alike digit from a different script that has a different
+value than what it appears to be.
- There are no changes intentionally incompatible with 5.XXX.XXX
- If any exist, they are bugs, and we request that you submit a
- report. See L</Reporting Bugs> below.
+=head2 String- and number-specific bitwise ops are no longer experimental
-[ List each incompatible change as a =head2 entry ]
+The new string-specific (C<&. |. ^. ~.>) and number-specific (C<& | ^ ~>)
+bitwise operators introduced in Perl 5.22 are no longer experimental.
+Because the number-specific ops are spelled the same way as the existing
+operators that choose their behaviour based on their operands, these
+operators must still be enabled via the "bitwise" feature, in either of
+these two ways:
-=head2 Over-radix digits in floating point literals
+ use feature "bitwise";
-Octal and binary floating point literals used to permit any hexadecimal
-digit to appear after the radix point. The digits are now restricted
-to those appropriate for the radix, as digits before the radix point
-always were.
+ use v5.28; # "bitwise" now included
-=head1 Deprecations
+They are also now enabled by the B<-E> command-line switch.
-XXX Any deprecated features, syntax, modules etc. should be listed here.
+The "bitwise" feature no longer emits a warning. Existing code that
+disables the "experimental::bitwise" warning category that the feature
+previously used will continue to work.
-=head2 Assignment to C<$[> will be fatal in Perl 5.30
+One caveat that module authors ought to be aware of is that the numeric
+operators now pass a fifth TRUE argument to overload methods. Any methods
+that check the number of operands may croak if they do not expect so many.
+XS authors in particular should be aware that this:
-Assigning a non-zero value to L<C<$[>|perlvar/$[> has been deprecated
-since Perl 5.12, but was never given a deadline for removal. This has
-now been scheduled for Perl 5.30.
-
-=head2 hostname() won't accept arguments in Perl 5.32
-
-Passing arguments to C<Sys::Hostname::hostname()> was already deprecated,
-but didn't have a removal date. This has now been scheduled for Perl
-5.32. [perl #124349]
-
-=head2 Module removals
-
-XXX Remove this section if not applicable.
+ SV *
+ bitop_handler (lobj, robj, swap)
-The following modules will be removed from the core distribution in a
-future release, and will at that time need to be installed from CPAN.
-Distributions on CPAN which require these modules will need to list them as
-prerequisites.
+may need to be changed to this:
-The core versions of these modules will now issue C<"deprecated">-category
-warnings to alert you to this fact. To silence these deprecation warnings,
-install the modules in question from CPAN.
+ SV *
+ bitop_handler (lobj, robj, swap, ...)
-Note that these are (with rare exceptions) fine modules that you are encouraged
-to continue to use. Their disinclusion from core primarily hinges on their
-necessity to bootstrapping a fully functional, CPAN-capable Perl installation,
-not usually on concerns over their design.
-
-=over
-
-=item L<Locale::Codes> and its associated Country, Currency and Language modules
-
-XXX Note that deprecated modules should be listed here even if they are listed
-as an updated module in the L</Modules and Pragmata> section.
+=head1 Incompatible Changes
-=back
+=head2 Smartmatch and switch reversion
-[ List each other deprecation as a =head2 entry ]
+The changes to the experimental smart match operator (C<~~>) and switch
+(C<given>/C<when>) constructs that were made in Perl 5.27.7 have been
+reverted due to the extent of the trouble caused to CPAN modules.
+It is expected that smartmatch will be changed again in the future,
+but preceded by some kind of explicit deprecation.
=head1 Performance Enhancements
-XXX Changes which enhance performance without changing behaviour go here.
-There may well be none in a stable release.
-
-[ List each enhancement as an =item entry ]
-
=over 4
=item *
-XXX
+The performance of pattern matching C<[[:ascii:]]> and C<[[:^ascii:]]>
+has been improved significantly except on EBCDIC platforms.
=back
=head1 Modules and Pragmata
-XXX All changes to installed files in F<cpan/>, F<dist/>, F<ext/> and F<lib/>
-go here. If Module::CoreList is updated, generate an initial draft of the
-following sections using F<Porting/corelist-perldelta.pl>. A paragraph summary
-for important changes should then be added by hand. In an ideal world,
-dual-life modules would have a F<Changes> file that could be cribbed.
-
-The list of new and updated modules is modified automatically as part of
-preparing a Perl release, so the only reason to manually add entries here is if
-you're summarising the important changes in the module update. (Also, if the
-manually-added details don't match the automatically-generated ones, the
-release manager will have to investigate the situation carefully.)
-
-[ Within each section, list entries as an =item entry ]
-
=head2 New Modules and Pragmata
=over 4
=item *
-L<Locale::Codes> has been upgraded from version 3.54 to 3.55
+L<XXX> has been upgraded from version A.xx to B.yy.
+
+If there was something important to note about this change, include that here.
+
+=item *
+
+L<Unicode::UCD> has been upgraded from version 0.69 to 0.70.
-B<NOTE>: L<Locale::Codes> is deprecated in core and will be removed
-from Perl 5.30.
+The function C<num> now accepts an optional parameter to help in
+diagnosing error returns.
=item *
-L<threads> has been upgraded from version 2.19 to 2.20.
-The documentation now better describes the problems that arise when
-returning values from threads, and no longer warns about creating threads
-in C<BEGIN> blocks. [perl #96538]
+L<XSLoader> has been upgraded from version 0.29 to 0.30.
+
+Platforms that use C<mod2fname> to edit the names of loadable libraries now look for
+bootstrap (.bs) files under the correct, non-edited name.
=item *
-L<Data::Dumper> has been upgraded from version 2.167_02 to 2.169.
-Quoting of glob names now obeys the Useqq option [perl #119831].
-Attempts to set an option to C<undef> through a combined getter/setter
-method are no longer mistaken for getter calls [perl #113090].
+L<Socket> has been upgraded from version 2.020_04 to 2.027.
=back
XXX Changes to files in F<pod/> go here. Consider grouping entries by
file and be sure to link to the appropriate page, e.g. L<perlfunc>.
-=head2 New Documentation
-
-XXX Changes which create B<new> files in F<pod/> go here.
-
-=head3 L<XXX>
-
-XXX Description of the purpose of the new file here
-
=head2 Changes to Existing Documentation
We have attempted to update the documentation to reflect the changes
listed in this document. If you find any we have missed, send email
to L<perlbug@perl.org|mailto:perlbug@perl.org>.
-XXX Changes which significantly change existing files in F<pod/> go here.
-However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
-section.
-
Additionally, the following selected changes have been made:
-=head3 L<perlapi>
-
-The API functions C<perl_parse()>, C<perl_run()>, and C<perl_destruct()>
-are now documented comprehensively, where previously the only
-documentation was a reference to the L<perlembed> tutorial.
-
-The documentation of C<newGIVENOP()> has been belatedly updated to
-account for the removal of lexical C<$_>.
-
-The API functions C<newCONSTSUB()> and C<newCONSTSUB_flags()> are
-documented much more comprehensively than before.
-
-=head3 L<perlop>
-
-The general explanation of operator precedence and associativity has
-been corrected and clarified. [perl #127391]
-
-The documentation for the C<\> referencing operator now explains the
-unusual context that it supplies to its operand. [perl #131061]
-
-=head3 L<perlsyn>
-
-The means to disambiguate between code blocks and hash constructors,
-already documented in L<perlref>, are now documented in L<perlsyn> too.
-[perl #130958]
-
-=head3 L<perlfunc>
-
-The documentation for the C<exists> operator no longer says that
-autovivification behaviour "may be fixed in a future release".
-We've determined that we're not going to change the default behaviour.
-[perl #127712]
-
-A couple of small details in the documentation for the C<bless> operator
-have been clarified. [perl #124428]
-
-The description of C<@INC> hooks in the documentation for C<require>
-has been corrected to say that filter subroutines receive a useless
-first argument. [perl #115754]
-
-The documentation of C<use> now explains what syntactically qualifies
-as a version number for its module version checking feature.
-
-=head3 L<perluniprops>
-
-For each binary table or property, the documentation now includes which
-characters in the range C<\x00-\xFF> it matches, as well as a list of
-the first few ranges of code points matched above that.
-
-=head3 L<perlobj>
-
-The documentation about C<DESTROY> methods has been corrected, updated,
-and revised, especially in regard to how they interact with exceptions.
-[perl #122753]
-
-=head3 L<perlsec>
-
-The documentation about set-id scripts has been updated and revised.
-[perl #74142]
-
-A section about using C<sudo> to run Perl scripts has been added.
-
=head3 L<perlembed>
-The examples in L<perlembed> have been made more portable in the way
-they exit, and the example that gets an exit code from the embedded Perl
-interpreter now gets it from the right place. The examples that pass
-a constructed argv to Perl now show the mandatory null C<argv[argc]>.
-
-=head3 L<perldebguts>
-
-The description of the conditions under which C<DB::sub()> will be called
-has been clarified. [perl #131672]
-
-=head3 L<perlintern>
-
-The internal functions C<newXS_len_flags()> and C<newATTRSUB_x()> are
-now documented.
-
-=head3 L<perlgit>
-
-The precise rules for identifying C<smoke-me> branches are now stated.
-
=over 4
=item *
-XXX Description of the change here
+An example in L<perlembed> used the string value of C<ERRSV> as a
+format string when calling croak(). If that string contains format
+codes such as C<%s> this could crash the program.
-=back
+This has been changed to a call to croak_sv().
-=head1 Diagnostics
+An alternative could have been to supply a trivial format string:
-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>.
+ croak("%s", SvPV_nolen(ERRSV));
-XXX New or changed warnings emitted by the core's C<C> code go here. Also
-include any changes in L<perldiag> that reconcile it to the C<C> code.
+or as a special case for C<ERRSV> simply:
-=head2 New Diagnostics
+ croak(NULL);
-XXX Newly added diagnostic messages go under here, separated into New Errors
-and New Warnings
+=back
-=head3 New Errors
+=head3 L<perlfunc>
=over 4
=item *
-L<Can't "goto" into a "given" block|perldiag/"Can't E<quot>gotoE<quot> into a E<quot>givenE<quot> block">
-
-(F) A "goto" statement was executed to jump into the middle of a C<given>
-block. You can't get there from here. See L<perlfunc/goto>.
+Improve the documentation of C<each> with a slightly more
+explicit description of the sharing of iterator state, and with
+caveats regarding the fragility of while-each loops. [perl #132644]
=back
-=head3 New Warnings
+=head3 L<perlfunc>, L<perlop>, L<perlsyn>
=over 4
=item *
-L<Old package separator used in string|perldiag/"Old package separator used in string">
-
-(W syntax) You used the old package separator, "'", in a variable
-named inside a double-quoted string; e.g., C<"In $name's house">. This
-is equivalent to C<"In $name::s house">. If you meant the former, put
-a backslash before the apostrophe (C<"In $name\'s house">).
+Improve the documentation of while condition magic in various
+places. [perl #132644]
=back
-=head2 Changes to Existing Diagnostics
-
-XXX Changes (i.e. rewording) of diagnostic messages go here
+=head3 L<perlrun>
=over 4
=item *
-XXX Describe change here
-
-=item *
-
-Warnings that a variable or subroutine "masks earlier declaration in same
-...", or that an C<our> variable has been redeclared, have been moved to a
-new warnings category "shadow". Previously they were in category "misc".
-
-=item *
-
-The deprecation warning from C<Sys::Hostname::hostname()> saying that
-it doesn't accept arguments now states the Perl version in which the
-warning will be upgraded to an error. [perl #124349]
-
-=item *
-
-The L<perldiag> entry for the error regarding a set-id script has been
-expanded to make clear that the error is reporting a specific security
-vulnerability, and to advise how to fix it.
+Clarify the documentation of B<< -m >>. [perl #131518]
=back
-=head1 Utility Changes
+=head1 Diagnostics
-XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directory F<utils>.
+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>.
-[ List utility changes as a =head2 entry for each utility and =item
-entries for each change
-Use L<XXX> with program names to get proper documentation linking. ]
+=head2 New Diagnostics
-=head2 L<XXX>
+=head3 New Errors
=over 4
=item *
-XXX
-
-=back
+L<Can't "goto" into a binary or list expression|perldiag/"Can't E<quot>gotoE<quot> into a binary or list expression">
-=head1 Configuration and Compilation
+Use of C<goto> to jump into the parameter of a binary or list operator has
+been prohibited, to prevent crashes and stack corruption. [perl #130936]
-XXX Changes to F<Configure>, F<installperl>, F<installman>, and analogous tools
-go here. Any other changes to the Perl build process should be listed here.
-However, any platform-specific changes should be listed in the
-L</Platform Support> section, instead.
+=back
-[ List changes as an =item entry ].
+=head2 Changes to Existing Diagnostics
=over 4
=item *
-XXX
+The C<< Unable to flush stdout >> error message was missing a trailing
+newline. [debian #875361]
=back
=head1 Testing
-XXX Any significant changes to the testing of a freshly built perl should be
-listed here. Changes which create B<new> files in F<t/> go here as do any
-large changes to the testing harness (e.g. when parallel testing was added).
-Changes to existing files in F<t/> aren't worth summarizing, although the bugs
-that they represent may be covered elsewhere.
-
-XXX If there were no significant test changes, say this:
-
-Tests were added and changed to reflect the other additions and changes
-in this release.
-
-XXX If instead there were significant changes, say this:
-
Tests were added and changed to reflect the other additions and
changes in this release. Furthermore, these significant changes were
made:
-[ List each test improvement as an =item entry ]
-
=over 4
=item *
-XXX
+Allow override of watchdog timer count in F<re/pat_psycho.t>.
-=back
-
-=head1 Platform Support
-
-XXX Any changes to platform support should be listed in the sections below.
-
-[ Within the sections, list each platform as an =item entry with specific
-changes as paragraphs below it. ]
-
-=head2 New Platforms
-
-XXX List any platforms that this version of perl compiles on, that previous
-versions did not. These will either be enabled by new files in the F<hints/>
-directories, or new subdirectories and F<README> files at the top level of the
-source tree.
-
-=over 4
-
-=item XXX-some-platform
-
-XXX
+This test can take a long time to run, so there is a timer to keep
+this in check (currently, 5 minutes). This commit adds checking
+the environment variable C<< PERL_TEST_TIME_OUT_FACTOR >>; if set,
+the time out setting is multiplied by its value.
=back
-=head2 Discontinued Platforms
-
-XXX List any platforms that this version of perl no longer compiles on.
-
-=over 4
-
-=item XXX-some-platform
-
-XXX
-
-=back
+=head1 Platform Support
=head2 Platform-Specific Notes
-XXX List any changes for specific platforms. This could include configuration
-and compilation changes or changes in portability/compatibility. However,
-changes within modules for platforms should generally be listed in the
-L</Modules and Pragmata> section.
-
=over 4
-=item Windows
-
-We now set C<$Config{libpth}> correctly for 64-bit builds using Visual C++
-versions earlier than 14.1.
+=item Cygwin
-=back
-
-=head1 Internal Changes
-
-XXX Changes which affect the interface available to C<XS> code go here. Other
-significant internal changes for future core maintainers should be noted as
-well.
+A build with the quadmath library can now be done on Cygwin.
-=over 4
-
-=item *
+=item FreeBSD
-XS modules can now automatically get reentrant versions of system
-functions on threaded perls.
+FreeBSD's F<< /usr/share/mk/sys.mk >> specifies C<< -O2 >> for
+architectures other than arm and mips. By default, compile perl
+with the same optimization levels.
-By saying
+=item VMS
- #define PERL_REENTRANT
+Several fix-ups for F<configure.com>, marking function VMS has
+(or doesn't have).
-near the beginning of an C<XS> file, it will be compiled so that
-whatever reentrant functions perl knows about on that system will
-automatically and invisibly be used instead of the plain, non-reentrant
-versions. For example, if you write C<getpwnam()> in your code, on a
-system that has C<pwnam_r()> all calls to the former will be translated
-invisibly into the latter. This does not happen except on threaded
-perls, as they aren't needed otherwise. Be aware that which functions
-have reentrant versions varies from system to system.
=back
=head1 Selected Bug Fixes
-XXX Important bug fixes in the core language are summarized here. Bug fixes in
-files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
-
-[ List each fix as an =item entry ]
-
=over 4
=item *
-XXX
+The C<printf> format specifier C<%.0f> no longer rounds incorrectly
+[perl #47602], and now shows the correct sign for a negative zero.
=item *
-Digits past the radix point in octal and binary floating point literals
-now have the correct weight on platforms where a floating point
-significand doesn't fit into an integer type.
+Fixed a use after free bug in pp_list introduced in 5.27.1. [perl #131954]
=item *
-C<exit(0)> in a C<UNITCHECK> or C<CHECK> block no longer permits the
-main program to run, and C<exit(0)> in a C<BEGIN> block no longer permits
-C<INIT> blocks to run before exiting. [perl #2754]
+Don't stringify numeric first arguments to
+C<< system() >> on Windows or VMS. [perl #132633]
-=item *
+=item *
-The canonical truth value no longer has a spurious special meaning as
-a callable. It used to be a magic placeholder for a missing C<import>
-or C<unimport> method. It is now treated like any other string C<1>.
-[perl #126042]
+Fixed an issue where the error C<< Scalar value @arrayname[0] better
+written as $arrayname >> would give an error C<< Cannot printf Inf with 'c' >>
+when arrayname starts with C<< Inf >>. [perl #132645]
=item *
-The C<readpipe()> built-in function now checks at compile time that
-it has only one parameter expression, and puts it in scalar context,
-thus ensuring that it doesn't corrupt the stack at runtime. [perl #4574]
+The Perl implementation of C<< getcwd() >> in C<< Cwd >> in the PathTools
+distribution now behaves the same as XS implementation on errors: it
+returns an error, and sets C<< $! >>. [perl #132648]
=item *
-C<sort> now performs correct reference counting when aliasing C<$a> and
-C<$b>, thus avoiding premature destruction and leakage of scalars if they
-are re-aliased during execution of the sort comparator. [perl #92264]
+Fixed argument counting in multiconcat when concatenating adjacent constants.
+[perl #132646]
=item *
-Perl's own C<malloc> no longer gets confused by attempts to allocate
-more than a gigabyte on a 64-bit platform. [perl #119829]
+Vivify array elements when putting them on the stack.
+Fixes [perl #8910] (reported in April 2002).
=item *
-Stacked file test operators in a sort comparator expression no longer
-cause a crash. [perl #129347]
-
-=item *
-
-An identity C<tr///> transformation on a reference is no longer mistaken
-for that reference for the purposes of deciding whether it can be
-assigned to. [perl #130578]
-
-=item *
-
-Lengthy hexadecimal, octal, or binary floating point literals no
-longer cause undefined behaviour when parsing digits that are of such
-low significance that they can't affect the floating point value.
-[perl #131894]
-
-=item *
-
-C<open $$scalarref...> and similar invocations no longer leak the file
-handle. [perl #115814]
-
-=item *
-
-Some convoluted kinds of regexp no longer cause an arithmetic overflow
-when compiled. [perl #131893]
-
-=item *
-
-The default typemap, by avoiding C<newGVgen>, now no longer leaks when
-XSUBs return file handles (C<PerlIO *> or C<FILE *>). [perl #115814]
-
-=item *
-
-Creating a C<BEGIN> block as an XS subroutine with a prototype no longer
-crashes because of the early freeing of the subroutine.
+Fixed parsing of braced subscript after parens. Fixes [perl #8045]
+(reported in December 2001).
=back
=head1 Known Problems
-XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any
-tests that had to be C<TODO>ed for the release would be noted here. Unfixed
-platform specific bugs also go here.
-
-[ List each fix as an =item entry ]
-
-=over 4
-
-=item *
-
-XXX
-
-=back
-
-=head1 Errata From Previous Releases
-
=over 4
=item *
-XXX Add anything here that we forgot to add, or were mistaken about, in
-the perldelta of a previous release.
+The bugfix for [perl #2754] in Perl 5.27.7 turned out to cause so much
+trouble on CPAN [perl #132577] that it is being postponed. The bug has
+been restored, so C<exit(0)> in a C<UNITCHECK> or C<CHECK> block now
+once again permits the main program to run, and C<exit(0)> in a C<BEGIN>
+block once again permits C<INIT> blocks to run before exiting. The bug
+will be fixed again for Perl 5.30.
=back
-=head1 Obituary
-
-XXX If any significant core contributor or member of the CPAN community has
-died, add a short obituary here.
-
=head1 Acknowledgements
XXX Generate this with:
- perl Porting/acknowledgements.pl v5.27.6..HEAD
+ perl Porting/acknowledgements.pl v5.27.7..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff