X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/5c26a17602c4585ca111bd154f6c65c681cd0572..8b998a9011e0f36f0e55ffe885747f59e8528269:/pod/perldelta.pod

diff --git a/pod/perldelta.pod b/pod/perldelta.pod
index 0af6b40..a01387b 100644
--- a/pod/perldelta.pod
+++ b/pod/perldelta.pod
@@ -5,15 +5,15 @@
 [ 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 v5.17.6
+perldelta - what is new for perl v5.17.7
 
 =head1 DESCRIPTION
 
-This document describes differences between the 5.17.5 release and the 5.17.6
+This document describes differences between the 5.17.6 release and the 5.17.7
 release.
 
-If you are upgrading from an earlier release such as 5.17.4, first read
-L<perl5175delta>, which describes differences between 5.17.4 and 5.17.5.
+If you are upgrading from an earlier release such as 5.17.5, first read
+L<perl5176delta>, which describes differences between 5.17.5 and 5.17.6.
 
 =head1 Notice
 
@@ -37,6 +37,17 @@ L</Selected Bug Fixes> section.
 
 =head1 Incompatible Changes
 
+=head2 readline() with C<$/ = \N> now reads N characters, not N bytes
+
+Previously, when reading from a stream with I/O layers such as
+C<encoding>, the readline() function, otherwise known as the C<< <> >>
+operator, would read I<N> bytes from the top-most layer. [perl #79960]
+
+Now, I<N> characters are read instead.
+
+There is no change in behaviour when reading from streams with no
+extra layers, since bytes map exactly to characters.
+
 XXX For a release on a stable branch, this section aspires to be:
 
     There are no changes intentionally incompatible with 5.XXX.XXX
@@ -45,15 +56,6 @@ XXX For a release on a stable branch, this section aspires to be:
 
 [ List each incompatible change as a =head2 entry ]
 
-=head2 An unknown character name in C<\N{...}> is now a syntax error
-
-Previously, it warned, and the Unicode REPLACEMENT CHARACTER was
-substituted.  Unicode now recommends that this situation be a syntax
-error.  Also, the previous behavior led to some confusing warnings and
-behaviors, and since the REPLACEMENT CHARACTER has no use other than as
-a stand-in for some unknown character, any code that has this problem is
-buggy.
-
 =head1 Deprecations
 
 XXX Any deprecated features, syntax, modules etc. should be listed here.  In
@@ -62,6 +64,41 @@ an updated module in the L</Modules and Pragmata> section.
 
 [ List each deprecation as a =head2 entry ]
 
+=head2 Various XS-callable functions are now deprecated
+
+The following functions will be removed from a future version of Perl,
+and should not be used.  With participating C compilers (e.g., gcc),
+compiling any file that uses any of these will generate a warning.
+These were not intended for public use; there are equivalent, faster,
+macros for most of them.  See L<perlapi/Character classes>:
+C<is_uni_ascii>,
+C<is_uni_ascii_lc>,
+C<is_uni_blank>,
+C<is_uni_blank_lc>,
+C<is_uni_cntrl>,
+C<is_uni_cntrl_lc>,
+C<is_uni_idfirst_lc>,
+C<is_uni_space>,
+C<is_uni_space_lc>,
+C<is_uni_xdigit>,
+C<is_uni_xdigit_lc>,
+C<is_utf8_ascii>,
+C<is_utf8_blank>,
+C<is_utf8_cntrl>,
+C<is_utf8_idcont>,
+C<is_utf8_idfirst>,
+C<is_utf8_perl_space>,
+C<is_utf8_perl_word>,
+C<is_utf8_posix_digit>,
+C<is_utf8_space>,
+C<is_utf8_xdigit>.
+C<is_utf8_xidcont>,
+C<is_utf8_xidfirst>,
+C<to_uni_lower_lc>,
+C<to_uni_title_lc>,
+and
+C<to_uni_upper_lc>.
+
 =head1 Performance Enhancements
 
 XXX Changes which enhance performance without changing behaviour go here.
@@ -105,11 +142,13 @@ XXX
 
 =item *
 
-L<CPAN> has been upgraded from version 1.98 to 1.99_51.
-
-=item *
-
-L<DynaLoader> has been upgraded from version 1.16 to 1.17.
+L<GDBM_File> has been upgraded from version 1.14 to 1.15. The undocumented
+optional fifth parameter to C<TIEHASH> has been removed. This was intended
+to provide control of the callback used by C<gdbm*> functions in case of
+fatal errors (such as filesystem problems), but did not work (and could
+never have worked). No code on CPAN even attempted to use it. The callback
+is now always the previous default, C<croak>. Problems on some platforms with
+how the C<C> C<croak> function is called have also been resolved.
 
 =back
 
@@ -142,13 +181,16 @@ 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.
 
-=head3 L<XXX>
+=head3 L<perlapi/Character classes>
 
 =over 4
 
 =item *
 
-XXX Description of the change here
+There are quite a few macros callable from XS modules that classify
+characters into things like alphabetic, punctuation, etc.  More of these
+are now documented, including ones which work on characters whose code
+points are outside the Latin-1 range.
 
 =back
 
@@ -276,13 +318,11 @@ XXX
 
 =head2 Discontinued Platforms
 
-XXX List any platforms that this version of perl no longer compiles on.
-
 =over 4
 
-=item XXX-some-platform
+=item BeOS
 
-XXX
+Support for BeOS has been removed.
 
 =back
 
@@ -313,7 +353,25 @@ well.
 
 =item *
 
-XXX
+SvUPGRADE() is no longer an expression. Originally this macro (and its
+underlying function, sv_upgrade()) were documented as boolean, although
+in reality they always croaked on error and never returned false. In 2005
+the documentation was updated to specify a void return value, but
+SvUPGRADE() was left always returning 1 for backwards compatibility. This
+has now been removed, and SvUPGRADE() is now a statement with no return
+value.
+
+So this is now a syntax error:
+
+    if (!SvUPGRADE(sv)) { croak(...); }
+
+If you have code like that, simply replace it with
+
+    SvUPGRADE(sv);
+
+or to to avoid compiler warnings with older perls, possibly
+
+    (void)SvUPGRADE(sv);
 
 =back
 
@@ -328,7 +386,8 @@ files in F<ext/> and F<lib/> are best summarized in L</Modules and Pragmata>.
 
 =item *
 
-XXX
+C<sort {undef} ...> under fatal warnings no longer crashes.  It started
+crashing in Perl 5.16.
 
 =back
 
@@ -357,7 +416,7 @@ here.
 
 XXX Generate this with:
 
-  perl Porting/acknowledgements.pl v5.17.5..HEAD
+  perl Porting/acknowledgements.pl v5.17.6..HEAD
 
 =head1 Reporting Bugs