X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/c12840116686daefb4f2c59922677425930cd05f..c338375688229712edcde6a1ad31fcc586f10e91:/pod/perldelta.pod
diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index cce9793..5639dd9 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -27,6 +27,29 @@ here, but most should go in the L section.
[ List each enhancement as a =head2 entry ]
+=head2 Unicode 7.0 is now supported
+
+For details on what is in this release, see
+L.
+
+=head2 Experimental C Backtrace API
+
+Starting from Perl 5.21.1, on some platforms Perl supports retrieving
+the C level backtrace (similar to what symbolic debuggers like gdb do).
+
+The backtrace returns the stack trace of the C call frames,
+with the symbol names (function names), the object names (like "perl"),
+and if it can, also the source code locations (file:line).
+
+The supported platforms are Linux and OS X (some *BSD might work at
+least partly, but they have not yet been tested).
+
+The feature needs to be enabled with C.
+
+Also included is a C API to retrieve backtraces.
+
+See L for more information.
+
=head2 C now ignores any Unicode pattern white space
The C regular expression modifier allows the pattern to contain
@@ -41,6 +64,12 @@ U+2028 LINE SEPARATOR,
and
U+2029 PARAGRAPH SEPARATOR.
+=head2 S> can restrict which locale categories are affected
+
+It is now possible to pass a parameter to S> to specify
+a subset of locale categories to be locale-aware, with the remaining
+ones unaffected. See L for details.
+
=head1 Security
XXX Any security-related notices go here. In particular, any security
@@ -57,6 +86,15 @@ 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 below.
+=head2 S> now is a fatal error
+
+The C pragma has been deprecated since v5.18, and its use now
+is a fatal error.
+
+=head2 C<\N{}> with a sequence of multiple spaces is now a fatal error.
+
+This has been deprecated since v5.18.
+
=head2 In double-quotish C<\cI>, I must now be a printable ASCII character
In prior releases, failure to do this raised a deprecation warning.
@@ -90,6 +128,44 @@ 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].
+
+=head2 MAD build option has been removed
+
+MAD = Misc Attribute Decoration; unmaintained attempt at preserving
+the Perl parse tree more faithfully so that automatic conversion of
+Perl 5 to Perl 6 would have been easier.
+
+This build-time configuration option had been unmaintained for years,
+and had probably seriously diverged on both Perl 5 and Perl 6 sides.
+
+=head2 Support for C without explicit operator has been removed
+
+Starting regular expressions matching only once directly with the
+question mark delimiter is now a syntax error, so that the question mark
+can be available for use in new operators. Write C instead,
+explicitly using the C operator: the question mark delimiter still
+invokes match-once behaviour.
+
=head1 Deprecations
XXX Any deprecated features, syntax, modules etc. should be listed here.
@@ -101,6 +177,15 @@ This non-graphic character is essentially indistinguishable from a
regular space, and so should not be allowed. See
L.
+=head2 A literal C<"{"> should now be escaped in a pattern
+
+If you want a literal left curly bracket (also called a left brace) in a
+regular expression pattern, you should now escape it by either
+preceding it with a backslash (C<"\{">) or enclosing it within square
+brackets C<"[{]">, or by using C<\Q>; otherwise a deprecation warning
+will be raised. This was first announced as forthcoming in the v5.16
+release; it will allow future extensions to the language to happen.
+
=head2 Module removals
XXX Remove this section if inapplicable.
@@ -141,7 +226,18 @@ There may well be none in a stable release.
=item *
-XXX
+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
=back
@@ -180,6 +276,16 @@ L<[perl #121574]|https://rt.perl.org/Ticket/Display.html?id=121574>
=item *
+L has been upgraded from version 2.151 to 2.152.
+
+Changes to resolve Coverity issues.
+
+XS dumps incorrectly stored the name of code references stored in a
+GLOB.
+L<[perl #122070]|https://rt.perl.org/Ticket/Display.html?id=122070>
+
+=item *
+
L has been upgraded from version 2.60_01 to 2.62.
B now has better error handling when the encoding name is nonexistent,
@@ -188,6 +294,12 @@ been fixed.
=item *
+L has been upgraded from version 0.16 to 0.17.
+
+Minor bug fixes and documentation fixes to Hash::Util::hash_stats()
+
+=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.
@@ -227,16 +339,11 @@ than 6.63_03
=item *
-L has been upgraded from version 1.44 to 1.45.
+L has been upgraded from version 1.09 to 1.10.
=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 *
+L has been upgraded from version 1.44 to 1.45.
fork() in the debugger under C will now create a new window for
the forked process. L<[perl
@@ -246,6 +353,26 @@ The debugger now saves the current working directory on startup and
restores it when you restart your program with C or . L<[perl
#121509]|https://rt.perl.org/Ticket/Display.html?id=121509>
+=item *
+
+L has been upgraded from version 0.18 to 0.19.
+
+No changes in behaviour.
+
+=item *
+
+L has been upgraded from version 0.012 to 0.013.
+
+No changes in behaviour.
+
+=item *
+
+L has been upgraded from version 0.18 to 0.19.
+
+No changes in behaviour.
+
+=item *
+
L has been upgraded from version 1.04 to 1.07.
Version 0.67's improved discontiguous contractions is invalidated by default
@@ -259,10 +386,10 @@ The XSUB implementation has been removed in favour of pure Perl.
=item *
-L has been upgraded from version 0.16 to 0.17.
-
-Minor bug fixes and documentation fixes to Hash::Util::hash_stats()
-
+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.
=back
@@ -295,13 +422,89 @@ XXX Changes which significantly change existing files in F go here.
However, any changes to F should go in the L
section.
-=head3 L
+=head3 L
+
+=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>
+
+=item *
+
+Note that C and C may fall back to the shell on
+Win32. Only C and C indirect object
+syntax will reliably avoid using the shell.
+
+This has also been noted in L.
+
+L<[perl #122046]|https://rt.perl.org/Ticket/Display.html?id=122046>
+
+=back
+
+=head3 L
+
+=over 4
+
+=item *
+
+C - Fix documentation to mention the use of C instead of
+C.
+
+L<[perl #121869]|https://rt.perl.org/Ticket/Display.html?id=121869>
+
+=item *
+
+Clarify where C may be embedded or is required to terminate a string.
+
+=item *
+
+Previously missing documentation due to formatting errors are now included.
+
+=item *
+
+Entries are now organized into groups rather than by file where they are found.
+
+=item *
+
+Alphabetical sorting of entries is now handled by the POD generator to make
+entries easier to find when scanning.
+
+=back
+
+=head3 L
=over 4
=item *
-XXX Description of the change here
+Updated documentation for the C C target.
+
+L<[perl #121431]|https://rt.perl.org/Ticket/Display.html?id=121431>
+
+=back
+
+=head3 L
+
+=over 4
+
+=item *
+
+The C modifier has been clarified to note that comments cannot be continued
+onto the next line by escaping them.
+
+=back
+
+=head3 L
+
+=over 4
+
+=item *
+
+The documentation includes many clarifications and fixes.
=back
@@ -335,7 +538,13 @@ XXX L
=item *
-XXX L
+L:
+
+(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:
+
+ no warnings "experimental::win32_perlio";
=back
@@ -347,6 +556,14 @@ XXX Changes (i.e. rewording) of diagnostic messages go here
=item *
+<> should be quotes
+
+This warning has been changed to
+L<< <> at require-statement should be quotes|perldiag/"<> at require-statement should be quotes" >>
+to make the issue more identifiable.
+
+=item *
+
L
This warning is now only produced when the newline is at the end of
@@ -357,19 +574,22 @@ the filename.
=head1 Utility Changes
XXX Changes to installed programs such as F and F go here.
-Most of these are built within the directories F and F.
+Most of these are built within the directory F.
[ List utility changes as a =head2 entry for each utility and =item
entries for each change
Use L with program names to get proper documentation linking. ]
-=head2 L
+=head2 F
=over 4
=item *
-XXX
+The F directory has been removed from the Perl core.
+
+This removes find2perl, s2p and a2p. They have all been released to CPAN as
+separate distributions (App::find2perl, App::s2p, App::a2p).
=back
@@ -386,7 +606,15 @@ L section, instead.
=item *
-XXX
+C now supports parallel testing.
+
+For example:
+
+ TEST_JOBS=9 make test.valgrind
+
+See L for more information.
+
+L<[perl #121431]|https://rt.perl.org/Ticket/Display.html?id=121431>
=back
@@ -436,9 +664,12 @@ XXX List any platforms that this version of perl no longer compiles on.
=over 4
-=item XXX-some-platform
+=item NeXTSTEP/OPENSTEP
-XXX
+NeXTSTEP was proprietary OS bundled with NeXT's workstations in the early
+to mid 90's; OPENSTEP was an API specification that provided a NeXTSTEP-like
+environment on a non-NeXTSTEP system. Both are now long dead, so support
+for building Perl on them has been removed.
=back
@@ -455,6 +686,16 @@ L section.
XXX
+=item OpenBSD
+
+On OpenBSD, Perl will now default to using the system C due to the
+security features it provides. Perl's own malloc wrapper has been in use
+since v5.14 due to performance reasons, but the OpenBSD project believes
+the tradeoff is worth it and would prefer that users who need the speed
+specifically ask for it.
+
+L<[perl #122000]|https://rt.perl.org/Ticket/Display.html?id=122000>.
+
=back
=head1 Internal Changes
@@ -469,6 +710,27 @@ well.
The deprecated variable C has been removed.
+=item *
+
+Perl now tries to keep the locale category C 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 would change it. Now such a call will change the
+underlying locale of the C 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 for
+guidance.
+
+=item *
+
+A new macro L|perlapi/isUTF8_CHAR> has been written which
+efficiently determines if the string given by its parameters begins
+with a well-formed UTF-8 encoded character.
+
=back
=head1 Selected Bug Fixes
@@ -511,6 +773,55 @@ C 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>, 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 and
+fixed.
+
+=item *
+
+system() and friends should now work properly on more Android builds.
+
+Due to an oversight, the value specified through -Dtargetsh to Configure
+would end up being ignored by some of the build process. This caused perls
+cross-compiled for Android to end up with defective versions of system(),
+exec() and backticks: the commands would end up looking for C
+instead of C, and so would fail for the vast majority
+of devices, leaving C<$!> as C.
+
+=item *
+
+C,
+C,
+and
+C
+now work. Previously it was impossible to escape these three
+left-characters with a backslash within a regular expression pattern
+where otherwise they would be considered metacharacters, and the pattern
+opening delimiter was the character, and the closing delimiter was its
+mirror character.
+
=back
=head1 Known Problems