diff options
Diffstat (limited to 'chromium/third_party/cygwin/lib/perl5/5.10/pods/perl592delta.pod')
| -rw-r--r-- | chromium/third_party/cygwin/lib/perl5/5.10/pods/perl592delta.pod | 342 |
1 files changed, 0 insertions, 342 deletions
diff --git a/chromium/third_party/cygwin/lib/perl5/5.10/pods/perl592delta.pod b/chromium/third_party/cygwin/lib/perl5/5.10/pods/perl592delta.pod deleted file mode 100644 index cc23843c4e4..00000000000 --- a/chromium/third_party/cygwin/lib/perl5/5.10/pods/perl592delta.pod +++ /dev/null @@ -1,342 +0,0 @@ -=head1 NAME - -perl592delta - what is new for perl v5.9.2 - -=head1 DESCRIPTION - -This document describes differences between the 5.9.1 and the 5.9.2 -development releases. See L<perl590delta> and L<perl591delta> for the -differences between 5.8.0 and 5.9.1. - -=head1 Incompatible Changes - -=head2 Packing and UTF-8 strings - -The semantics of pack() and unpack() regarding UTF-8-encoded data has been -changed. Processing is now by default character per character instead of -byte per byte on the underlying encoding. Notably, code that used things -like C<pack("a*", $string)> to see through the encoding of string will now -simply get back the original $string. Packed strings can also get upgraded -during processing when you store upgraded characters. You can get the old -behaviour by using C<use bytes>. - -To be consistent with pack(), the C<C0> in unpack() templates indicates -that the data is to be processed in character mode, i.e. character by -character; on the contrary, C<U0> in unpack() indicates UTF-8 mode, where -the packed string is processed in its UTF-8-encoded Unicode form on a byte -by byte basis. This is reversed with regard to perl 5.8.X. - -Moreover, C<C0> and C<U0> can also be used in pack() templates to specify -respectively character and byte modes. - -C<C0> and C<U0> in the middle of a pack or unpack format now switch to the -specified encoding mode, honoring parens grouping. Previously, parens were -ignored. - -Also, there is a new pack() character format, C<W>, which is intended to -replace the old C<C>. C<C> is kept for unsigned chars coded as bytes in -the strings internal representation. C<W> represents unsigned (logical) -character values, which can be greater than 255. It is therefore more -robust when dealing with potentially UTF-8-encoded data (as C<C> will wrap -values outside the range 0..255, and not respect the string encoding). - -In practice, that means that pack formats are now encoding-neutral, except -C<C>. - -For consistency, C<A> in unpack() format now trims all Unicode whitespace -from the end of the string. Before perl 5.9.2, it used to strip only the -classical ASCII space characters. - -=head2 Miscellaneous - -The internal dump output has been improved, so that non-printable characters -such as newline and backspace are output in C<\x> notation, rather than -octal. - -The B<-C> option can no longer be used on the C<#!> line. It wasn't -working there anyway. - -=head1 Core Enhancements - -=head2 Malloc wrapping - -Perl can now be built to detect attempts to assign pathologically large chunks -of memory. Previously such assignments would suffer from integer wrap-around -during size calculations causing a misallocation, which would crash perl, and -could theoretically be used for "stack smashing" attacks. The wrapping -defaults to enabled on platforms where we know it works (most AIX -configurations, BSDi, Darwin, DEC OSF/1, FreeBSD, HP-UX, GNU Linux, OpenBSD, -Solaris, VMS and most Win32 compilers) and defaults to disabled on other -platforms. - -=head2 Unicode Character Database 4.0.1 - -The copy of the Unicode Character Database included in Perl 5.9 has -been updated to 4.0.1 from 4.0.0. - -=head2 suidperl less insecure - -Paul Szabo has analysed and patched C<suidperl> to remove existing known -insecurities. Currently there are no known holes in C<suidperl>, but previous -experience shows that we cannot be confident that these were the last. You may -no longer invoke the set uid perl directly, so to preserve backwards -compatibility with scripts that invoke #!/usr/bin/suidperl the only set uid -binary is now C<sperl5.9.>I<n> (C<sperl5.9.2> for this release). C<suidperl> -is installed as a hard link to C<perl>; both C<suidperl> and C<perl> will -invoke C<sperl5.9.2> automatically the set uid binary, so this change should -be completely transparent. - -For new projects the core perl team would strongly recommend that you use -dedicated, single purpose security tools such as C<sudo> in preference to -C<suidperl>. - -=head2 PERLIO_DEBUG - -The C<PERLIO_DEBUG> environment variable has no longer any effect for -setuid scripts and for scripts run with B<-T>. - -Moreover, with a thread-enabled perl, using C<PERLIO_DEBUG> could lead to -an internal buffer overflow. This has been fixed. - -=head2 Formats - -In addition to bug fixes, C<format>'s features have been enhanced. See -L<perlform>. - -=head2 Unicode Character Classes - -Perl's regular expression engine now contains support for matching on the -intersection of two Unicode character classes. You can also now refer to -user-defined character classes from within other user defined character -classes. - -=head2 Byte-order modifiers for pack() and unpack() - -There are two new byte-order modifiers, C<E<gt>> (big-endian) and C<E<lt>> -(little-endian), that can be appended to most pack() and unpack() template -characters and groups to force a certain byte-order for that type or group. -See L<perlfunc/pack> and L<perlpacktut> for details. - -=head2 Byte count feature in pack() - -A new pack() template character, C<".">, returns the number of characters -read so far. - -=head2 New variables - -A new variable, ${^RE_DEBUG_FLAGS}, controls what debug flags are in -effect for the regular expression engine when running under C<use re -"debug">. See L<re> for details. - -A new variable ${^UTF8LOCALE} indicates where an UTF-8 locale was detected -by perl at startup. - -=head1 Modules and Pragmata - -=head2 New modules - -=over 4 - -=item * - -C<encoding::warnings>, by Audrey Tang, is a module to emit warnings -whenever an ASCII character string containing high-bit bytes is implicitly -converted into UTF-8. - -=item * - -C<Module::CoreList>, by Richard Clamp, is a small handy module that tells -you what versions of core modules ship with any versions of Perl 5. It -comes with a command-line frontend, C<corelist>. - -=back - -=head2 Updated And Improved Modules and Pragmata - -Dual-lived modules have been updated to be kept up-to-date with respect to -CPAN. - -The dual-lived modules which contain an C<_> in their version number are -actually I<ahead> of the corresponding CPAN release. - -=over 4 - -=item B::Concise - -C<B::Concise> was significantly improved. - -=item Socket - -There is experimental support for Linux abstract Unix domain sockets. - -=item Sys::Syslog - -C<syslog()> can now use numeric constants for facility names and priorities, -in addition to strings. - -=item threads - -Detached threads are now also supported on Windows. - -=back - -=head1 Utility Changes - -=over 4 - -=item * - -The C<corelist> utility is now installed with perl (see L</"New modules"> -above). - -=item * - -C<h2ph> and C<h2xs> have been made a bit more robust with regard to -"modern" C code. - -=item * - -Several bugs have been fixed in C<find2perl>, regarding C<-exec> and -C<-eval>. Also the options C<-path>, C<-ipath> and C<-iname> have been -added. - -=item * - -The Perl debugger can now save all debugger commands for sourcing later; -notably, it can now emulate stepping backwards, by restarting and -rerunning all bar the last command from a saved command history. - -It can also display the parent inheritance tree of a given class. - -Perl has a new -dt command-line flag, which enables threads support in the -debugger. - -=back - -=head1 Performance Enhancements - -=over 4 - -=item * - -Unicode case mappings (C</i>, C<lc>, C<uc>, etc) are faster. - -=item * - -C<@a = sort @a> was optimized to do in-place sort. Likewise, C<reverse -sort ...> is now optimized to sort in reverse, avoiding the generation of -a temporary intermediate list. - -=item * - -Unnecessary assignments are optimised away in - - my $s = undef; - my @a = (); - my %h = (); - -=item * - -C<map> in scalar context is now optimized. - -=item * - -The regexp engine now implements the trie optimization : it's able to -factorize common prefixes and suffixes in regular expressions. A new -special variable, ${^RE_TRIE_MAXBUF}, has been added to fine-tune this -optimization. - -=back - -=head1 Installation and Configuration Improvements - -Run-time customization of @INC can be enabled by passing the -C<-Dusesitecustomize> flag to configure. When enabled, this will make perl -run F<$sitelibexp/sitecustomize.pl> before anything else. This script can -then be set up to add additional entries to @INC. - -There is alpha support for relocatable @INC entries. - -Perl should build on Interix and on GNU/kFreeBSD. - -=head1 Selected Bug Fixes - -Most of those bugs were reported in the perl 5.8.x maintenance track. -Notably, quite a few utf8 bugs were fixed, and several memory leaks were -suppressed. The perl58Xdelta manpages have more details on them. - -Development-only bug fixes include : - -C<$Foo::_> was wrongly forced as C<$main::_>. - -=head1 New or Changed Diagnostics - -A new warning, C<!=~ should be !~>, is emitted to prevent this misspelling -of the non-matching operator. - -The warning I<Newline in left-justified string> has been removed. - -The error I<Too late for "-T" option> has been reformulated to be more -descriptive. - -There is a new compilation error, I<Illegal declaration of subroutine>, -for an obscure case of syntax errors. - -The diagnostic output of Carp has been changed slightly, to add a space after -the comma between arguments. This makes it much easier for tools such as -web browsers to wrap it, but might confuse any automatic tools which perform -detailed parsing of Carp output. - -C<perl -V> has several improvements, making it more useable from shell -scripts to get the value of configuration variables. See L<perlrun> for -details. - -=head1 Changed Internals - -The perl core has been refactored and reorganised in several places. -In short, this release will not be binary compatible with any previous -perl release. - -=head1 Known Problems - -For threaded builds, F<ext/threads/shared/t/wait.t> has been reported to -fail some tests on HP-UX 10.20. - -Net::Ping might fail some tests on HP-UX 11.00 with the latest OS -upgrades. - -F<t/io/dup.t>, F<t/io/open.t> and F<lib/ExtUtils/t/Constant.t> fail some -tests on some BSD flavours. - -=head1 Plans for the next release - -The current plan for perl 5.9.3 is to add CPANPLUS as a core module. -More regular expression optimizations are also in the works. - -It is planned to release a development version of perl more frequently, -i.e. each time something major changes. - -=head1 Reporting Bugs - -If you find what you think is a bug, you might check the articles -recently posted to the comp.lang.perl.misc newsgroup and the perl -bug database at http://bugs.perl.org/ . There may also be -information at http://www.perl.org/ , the Perl Home Page. - -If you believe you have an unreported bug, please run the B<perlbug> -program included with your release. Be sure to trim your bug down -to a tiny but sufficient test case. Your bug report, along with the -output of C<perl -V>, will be sent off to perlbug@perl.org to be -analysed by the Perl porting team. - -=head1 SEE ALSO - -The F<Changes> file for exhaustive details on what changed. - -The F<INSTALL> file for how to build Perl. - -The F<README> file for general stuff. - -The F<Artistic> and F<Copying> files for copyright information. - -=cut |