[ 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 v5.21.1
+perldelta - what is new for perl v5.21.2
=head1 DESCRIPTION
-This document describes differences between the 5.21.0 release and the 5.21.1
+This document describes differences between the 5.21.1 release and the 5.21.2
release.
-If you are upgrading from an earlier release such as 5.20.0, first read
-L<perl5210delta>, which describes differences between 5.20.0 and 5.21.0.
+If you are upgrading from an earlier release such as 5.21.0, first read
+L<perl5211delta>, which describes differences between 5.21.0 and 5.21.1.
=head1 Notice
[ List each enhancement as a =head2 entry ]
-=head2 C<qr/foo/x> now ignores any Unicode pattern white space
-
-The C</x> regular expression modifier allows the pattern to contain
-white space and comments, both of which are ignored, for improved
-readability. Until now, not all the white space characters that Unicode
-designates for this purpose were handled. The additional ones now
-recognized are
-U+0085 NEXT LINE,
-U+200E LEFT-TO-RIGHT MARK,
-U+200F RIGHT-TO-LEFT MARK,
-U+2028 LINE SEPARATOR,
-and
-U+2029 PARAGRAPH SEPARATOR.
-
-=head2 S<C<use locale>> can restrict which locale categories are affected
-
-It is now possible to pass a parameter to S<C<use locale>> to specify
-a subset of locale categories to be locale-aware, with the remaining
-ones unaffected. See L<perllocale/The "use locale" pragma> for details.
-
=head1 Security
XXX Any security-related notices go here. In particular, any security
[ List each security issue as a =head2 entry ]
+=head2 Perl is now always compiled with -D_FORTIFY_SOURCE=2 if available
+
+The 'code hardening' option called C<_FORTIFY_SOURCE>, available in
+gcc 4.*, is now always used for compiling Perl, if available.
+
+Note that this isn't necessarily a huge step since in many platforms
+the step had already been taken several years ago: many Linux
+distributions (like Fedora) have been using this option for Perl,
+and OS X has enforced the same for many years.
+
=head1 Incompatible Changes
XXX For a release on a stable branch, this section aspires to be:
If any exist, they are bugs, and we request that you submit a
report. See L</Reporting Bugs> below.
-=head2 In double-quotish C<\cI<X>>, I<X> must now be a printable ASCII character
-
-In prior releases, failure to do this raised a deprecation warning.
-
-=head2 Splitting the tokens C<(?> and C<(*> in regular expressions is
-now a fatal compilation error.
-
-These had been deprecated since v5.18.
-
-=head2 5 additional characters are treated as white space under C</x> in
-regex patterns (unless escaped)
-
-The use of these characters with C</x> outside bracketed character
-classes and when not preceeded by a backslash has raised a deprecation
-warning since v5.18. Now they will be ignored. See L</qrE<sol>fooE<sol>x>
-for the list of the five characters.
-
-=head2 Comment lines within S<C<(?[ ])>> now are ended only by a C<\n>
-
-S<C<(?[ ])>> is an experimental feature, introduced in v5.18. It operates
-as if C</x> is always enabled. But there was a difference, comment
-lines (following a C<#> character) were terminated by anything matching
-C<\R> which includes all vertical whitespace, such as form feeds. For
-consistency, this is now changed to match what terminates comment lines
-outside S<C<(?[ ])>>, namely a C<\n> (even if escaped), which is the
-same as what terminates a heredoc string and formats.
-
-=head2 Omitting % and @ on hash and array names is no longer permitted
-
-Really old Perl let you omit the @ on array names and the % on hash
-names in some spots. This has issued a deprecation warning since Perl
-5.0, and is no longer permitted.
-
-=head2 C<"$!"> text is now in English outside C<"use locale"> scope
-
-Previously, the text, unlike almost everything else, always came out
-based on the current underlying locale of the program. (Also affected
-on some systems is C<"$^E>".) For programs that are unprepared to
-handle locale, this can cause garbage text to be displayed. It's better
-to display text that is translatable via some tool than garbage text
-which is much harder to figure out.
-
-=head2 C<"$!"> text will be returned in UTF-8 when appropriate
-
-The stringification of C<$!> and C<$^E> will have the UTF-8 flag set
-when the text is actually non-ASCII UTF-8. This will enable programs
-that are set up to be locale-aware to properly output messages in the
-user's native language. Code that needs to continue the 5.20 and
-earlier behavior can do the stringification within the scopes of both
-'use bytes' and 'use locale ":messages". No other Perl operations will
-be affected by locale; only C<$!> and C<$^E> stringification. The
-'bytes' pragma causes the UTF-8 flag to not be set, just as in previous
-Perl releases. This resolves [perl #112208].
+[ List each incompatible change as a =head2 entry ]
=head1 Deprecations
XXX Any deprecated features, syntax, modules etc. should be listed here.
-=head2 Using a NO-BREAK space in a character alias for C<\N{...}> is now
-deprecated
-
-This non-graphic character is essentially indistinguishable from a
-regular space, and so should not be allowed. See
-L<charnames/CUSTOM ALIASES>.
-
=head2 Module removals
XXX Remove this section if inapplicable.
=item *
-Many internal functions have been refactored to improve performance and reduce
-their memory footprints.
-
-L<[perl #121436]|https://rt.perl.org/Ticket/Display.html?id=121436>
-L<[perl #121906]|https://rt.perl.org/Ticket/Display.html?id=121906>
-L<[perl #121969]|https://rt.perl.org/Ticket/Display.html?id=121969>
-
-=item *
-
-C<-T> and C<-B> filetests will return sooner when an empty file is detected.
-
-L<perl #121489|https://rt.perl.org/Ticket/Display.html?id=121489>
+XXX
=back
=item *
-L<Carp> has been upgraded from version 1.3301 to 1.34.
+L<Math::BigInt> has been upgraded from version 1.9995 to 1.9996.
-Carp::Heavy now ignores version mismatches with Carp if Carp is newer
-than 1.12, since Carp::Heavy's guts were merged into Carp at that
-point.
-L<[perl #121574]|https://rt.perl.org/Ticket/Display.html?id=121574>
+Correct handling of subclasses.
+L<[cpan #96254]|https://rt.cpan.org/Ticket/Display.html?id=96254>
+L<[cpan #96329]|https://rt.cpan.org/Ticket/Display.html?id=96329>
=item *
-L<Encode> has been upgraded from version 2.60_01 to 2.62.
-
-B<piconv> now has better error handling when the encoding name is nonexistent,
-and a build breakage when upgrading L<Encode> in perl-5.8.2 and earlier has
-been fixed.
-
-=item *
-
-The libnet collection of modules has been upgraded from version 1.25 to 1.27.
-
-There are only whitespace changes to the installed files.
-
-=item *
-
-The Locale-Codes collection of modules has been upgraded from vesion 3.30 to 3.31.
-
-Fixed a bug in the scripts used to extract data from spreadsheets that
-prevented the SHP currency code from being found.
-L<[cpan #94229]|https://rt.cpan.org/Ticket/Display.html?id=94229>
-
-=item *
-
-L<Math::BigInt> has been upgraded from version 1.9993 to 1.9994.
-
-Synchronize POD changes from the CPAN release.
-
-C<< Math::BigFloat->blog(x) >> would sometimes return blog(2*x) when
-the accuracy was greater than 70 digits.
-
-The result of C<< Math::BigFloat->bdiv() >> in list context now
-satisfies C<< x = quotient * divisor + remainder >>.
-
-=item *
-
-L<Math::BigRat> has been upgraded from version 0.2606 to 0.2607.
-
-Synchronize POD changes from the CPAN release.
-
-=item *
-
-L<Module::Metadata> has been upgraded from version 1.000022 to 1.000024.
-
-Support installations on older perls with an L<ExtUtils::MakeMaker> earlier
-than 6.63_03
-
-=item *
-
-L<perl5db.pl> has been upgraded from version 1.44 to 1.45.
-
-=item *
-
-A mismatch between the documentation and the code in utf8::downgrade()
-was fixed in favour of the documentation. The optional second argument
-is now correctly treated as a perl boolean (true/false semantics) and
-not as an integer.
-
-=item *
-
-fork() in the debugger under C<tmux> will now create a new window for
-the forked process. L<[perl
-#121333]|https://rt.perl.org/Ticket/Display.html?id=121333>
-
-The debugger now saves the current working directory on startup and
-restores it when you restart your program with C<R> or <rerun>. L<[perl
-#121509]|https://rt.perl.org/Ticket/Display.html?id=121509>
-
-L<Unicode::Collate> has been upgraded from version 1.04 to 1.07.
-
-Version 0.67's improved discontiguous contractions is invalidated by default
-and is supported as a parameter 'long_contraction'.
-
-=item *
-
-L<Unicode::Normalize> has been upgraded from version 1.17 to 1.18.
-
-The XSUB implementation has been removed in favour of pure Perl.
-
-=item *
-
-L<Hash::Util> has been upgraded from version 0.16 to 0.17.
-
-Minor bug fixes and documentation fixes to Hash::Util::hash_stats()
-
+L<Module::CoreList> has been upgraded from version 5.021001_1 to 5.021002.
=back
However, any changes to F<pod/perldiag.pod> should go in the L</Diagnostics>
section.
-=head3 L<perlfunc>
-
-=over 4
-
-=item *
-
-C<-l> now notes that it will return false if symlinks aren't supported by the
-file system.
-
-L<[perl #121523]|https://rt.perl.org/Ticket/Display.html?id=121523>
-
-=back
-
-=head3 L<perlapi>
+=head3 L<XXX>
=over 4
=item *
-C<sv_usepvn_flags> - Fix documentation to mention the use of C<NewX> instead of
-C<malloc>.
-
-L<[perl #121869]|https://rt.perl.org/Ticket/Display.html?id=121869>
+XXX Description of the change here
=back
=item *
-L<PerlIO layer ':win32' is experimental|perldiag/"PerlIO layer ':win32' is experimental">:
-
-(S experimental::win32_perlio) The C<:win32> PerlIO layer is
-experimental. If you want to take the risk of using this layer,
-simply disable this warning:
+L<Argument "%s" treated as 0 in increment (++)|perldiag/"Argument "%s" treated
+as 0 in increment (++)">
- no warnings "experimental::win32_perlio";
+(W numeric) The indicated string was fed as an argument to the C<++> operator
+which expects either a number or a string matching C</^[a-zA-Z]*[0-9]*\z/>.
+See L<perlop/Auto-increment and Auto-decrement> for details.
=back
=item *
-L<Unsuccessful %s on filename containing newline|perldiag/"Unsuccessful %s on filename containing newline">
-
-This warning is now only produced when the newline is at the end of
-the filename.
+XXX Describe change here
=back
=head1 Utility Changes
XXX Changes to installed programs such as F<perlbug> and F<xsubpp> go here.
-Most of these are built within the directories F<utils> and F<x2p>.
+Most of these are built within the directory F<utils>.
[ List utility changes as a =head2 entry for each utility and =item
entries for each change
=over 4
-=item XXX-some-platform
+=item Solaris
-XXX
+Builds on Solaris 10 with C<-Dusedtrace> would fail early since make
+didn't follow implied dependencies to build C<perldtrace.h>. Added an
+explicit dependency to C<depend>.
+L<[perl #120120]|https://rt.perl.org/Ticket/Display.html?id=120120>
=back
significant internal changes for future core maintainers should be noted as
well.
+[ List each change as a =item entry ]
+
=over 4
=item *
-The deprecated variable C<PL_sv_objcount> has been removed.
-
-=item *
+The following private API functions had their context parameter removed,
+C<Perl_cast_ulong>, C<Perl_cast_i32>, C<Perl_cast_iv>, C<Perl_cast_uv>,
+C<Perl_cv_const_sv>, C<Perl_mg_find>, C<Perl_mg_findext>, C<Perl_mg_magical>,
+C<Perl_mini_mktime>, C<Perl_my_dirfd>, C<Perl_sv_backoff>, C<Perl_utf8_hop>.
-Perl now tries to keep the locale category C<LC_NUMERIC> set to "C"
-except around operations that need it to be set to the program's
-underlying locale. This protects the many XS modules that cannot cope
-with the decimal radix character not being a dot. Prior to this
-release, Perl initialized this category to "C", but a call to
-C<POSIX::setlocale()> would change it. Now such a call will change the
-underlying locale of the C<LC_NUMERIC> category for the program, but the
-locale exposed to XS code will remain "C". There is an API under
-development for those relatively few modules that need to use the
-underlying locale. This API will be nailed down during the course of
-developing v5.21. Send email to L<mailto:perl5-porters@perl.org> for
-guidance.
+Users of the public API prefix-less calls remain unaffected.
=back
=item *
-index() and rindex() no longer crash when used on strings over 2GB in
-size.
-L<[perl #121562]|https://rt.perl.org/Ticket/Display.html?id=121562>.
-
-=item *
-
-A small previously intentional memory leak in PERL_SYS_INIT/PERL_SYS_INIT3 on
-Win32 builds was fixed. This might affect embedders who repeatedly create and
-destroy perl engines within the same process.
-
-=item *
-
-C<POSIX::localeconv()> now returns the data for the program's underlying
-locale even when called from outside the scope of S<C<use locale>>.
-
-=item *
-
-C<POSIX::localeconv()> now works properly on platforms which don't have
-C<LC_NUMERIC> and/or C<LC_MONETARY>, or for which Perl has been compiled
-to disregard either or both of these locale categories. In such
-circumstances, there are now no entries for the corresponding values in
-the hash returned by C<localeconv()>.
-
-=item *
-
-C<POSIX::localeconv()> now marks appropriately the values it returns as
-UTF-8 or not. Previously they were always returned as a bytes, even if
-they were supposed to be encoded as UTF-8.
-
-=item *
-
-On Microsoft Windows, within the scope of C<S<use locale>>, the following
-POSIX character classes gave results for many locales that did not
-conform to the POSIX standard:
-C<[[:alnum:]]>,
-C<[[:alpha:]]>,
-C<[[:blank:]]>,
-C<[[:digit:]]>,
-C<[[:graph:]]>,
-C<[[:lower:]]>,
-C<[[:print:]]>,
-C<[[:punct:]]>,
-C<[[:upper:]]>,
-C<[[:word:]]>,
-and
-C<[[:xdigit:]]>.
-These are because the underlying Microsoft implementation does not
-follow the standard. Perl now takes special precautions to correct for
-this.
-
-=item *
-
-Many issues have been detected by L<Coverity|http://www.coverity.com/> and
-fixed.
+XXX
=back
https://perl5.git.perl.org / perl5.git / blobdiff