[ 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 v5.27.5
+perldelta - what is new for perl v5.27.7
=head1 DESCRIPTION
-This document describes differences between the 5.27.4 release and the 5.27.5
+This document describes differences between the 5.27.6 release and the 5.27.7
release.
-If you are upgrading from an earlier release such as 5.27.3, first read
-L<perl5274delta>, which describes differences between 5.27.3 and 5.27.4.
+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
[ List each enhancement as a =head2 entry ]
+=head2 The C<sprintf> C<%j> format size modifier is now available with
+pre-C99 compilers
+
+The actual size used depends on the platform, so remains unportable.
+
=head1 Security
XXX Any security-related notices go here. In particular, any security
[ List each incompatible change as a =head2 entry ]
+=head2 Over-radix digits in floating point literals
+
+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.
+
=head1 Deprecations
XXX Any deprecated features, syntax, modules etc. should be listed here.
+=head2 Assignment to C<$[> will be fatal in Perl 5.30
+
+Assigning a non-zero value to L<C<$[>|perlvar/$[> has been deprecated
+since Perl 5.12, but was never given a deadline for removal. This has
+now been scheduled for Perl 5.30.
+
+=head2 hostname() won't accept arguments in Perl 5.32
+
+Passing arguments to C<Sys::Hostname::hostname()> was already deprecated,
+but didn't have a removal date. This has now been scheduled for Perl
+5.32. [perl #124349]
+
=head2 Module removals
-XXX Remove this section if inapplicable.
+XXX Remove this section if not applicable.
The following modules will be removed from the core distribution in a
future release, and will at that time need to be installed from CPAN.
=over
-=item XXX
+=item L<Locale::Codes> and its associated Country, Currency and Language modules
XXX Note that deprecated modules should be listed here even if they are listed
as an updated module in the L</Modules and Pragmata> section.
=item *
-Calls to C<require> for an already loaded module are now slightly
-faster. [perl #132171]
+XXX
=back
=item *
-XXX
+XXX Remove this section if not applicable.
=back
=item *
-L<XXX> has been upgraded from version A.xx to B.yy.
+L<Locale::Codes> has been upgraded from version 3.54 to 3.55
+
+B<NOTE>: L<Locale::Codes> is deprecated in core and will be removed
+from Perl 5.30.
+
+=item *
+
+L<Data::Dumper> has been upgraded from version 2.167_02 to 2.168.
+Quoting of glob names now obeys the Useqq option [perl #119831].
=back
Additionally, the following selected changes have been made:
-=head3 L<XXX>
+=head3 L<perlapi>
+
+The documentation of C<newGIVENOP()> has been belatedly updated to
+account for the removal of lexical C<$_>.
+
+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]
+
+=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<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.
=over 4
=item *
-XXX L<message|perldiag/"message">
+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>.
=back
=item *
-XXX L<message|perldiag/"message">
+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 $name\'s house">).
=back
XXX Describe change here
+=item *
+
+Warnings that a variable or subroutine "masks earlier declaration in same
+...", or that an C<our> variable has been redeclared, have been moved to a
+new warnings category "shadow". Previously they were in category "misc".
+
+=item *
+
+The deprecation warning from C<Sys::Hostname::hostname()> saying that
+it doesn't accept arguments now states the Perl version in which the
+warning will be upgraded to an error. [perl #124349]
+
=back
=head1 Utility Changes
=over 4
-=item XXX-some-platform
+=item Windows
-XXX
+We now set C<$Config{libpth}> correctly for 64-bit builds using Visual C++
+versions earlier than 14.1.
=back
significant internal changes for future core maintainers should be noted as
well.
-[ List each change as an =item entry ]
-
=over 4
=item *
-XXX
+XS modules can now automatically get reentrant versions of system
+functions on threaded perls.
+
+By saying
+
+ #define PERL_REENTRANT
+
+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
XXX
+=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]
+
+=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]
+
+=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 *
+
+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.
+
=back
=head1 Known Problems
=head1 Obituary
-XXX If any significant core contributor has died, we've added a short obituary
-here.
+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 v5.25.5..HEAD
+ perl Porting/acknowledgements.pl v5.27.6..HEAD
=head1 Reporting Bugs
https://perl5.git.perl.org / perl5.git / blobdiff