411 lines
11 KiB
Plaintext
411 lines
11 KiB
Plaintext
=encoding utf8
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=head1 NAME
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perl5201delta - what is new for perl v5.20.1
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=head1 DESCRIPTION
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This document describes differences between the 5.20.0 release and the 5.20.1
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release.
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If you are upgrading from an earlier release such as 5.18.0, first read
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L<perl5200delta>, which describes differences between 5.18.0 and 5.20.0.
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=head1 Incompatible Changes
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There are no changes intentionally incompatible with 5.20.0. If any exist,
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they are bugs, and we request that you submit a report. See L</Reporting Bugs>
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below.
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=head1 Performance Enhancements
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=over 4
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=item *
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An optimization to avoid problems with COW and deliberately overallocated PVs
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has been disabled because it interfered with another, more important,
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optimization, causing a slowdown on some platforms.
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L<[perl #121975]|https://rt.perl.org/Ticket/Display.html?id=121975>
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=item *
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Returning a string from a lexical variable could be slow in some cases. This
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has now been fixed.
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L<[perl #121977]|https://rt.perl.org/Ticket/Display.html?id=121977>
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=back
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=head1 Modules and Pragmata
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=head2 Updated Modules and Pragmata
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=over 4
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=item *
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L<Config::Perl::V> has been upgraded from version 0.20 to 0.22.
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The list of Perl versions covered has been updated and some flaws in the
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parsing have been fixed.
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=item *
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L<Exporter> has been upgraded from version 5.70 to 5.71.
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Illegal POD syntax in the documentation has been corrected.
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=item *
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L<ExtUtils::CBuilder> has been upgraded from version 0.280216 to 0.280217.
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Android builds now link to both B<-lperl> and C<$Config::Config{perllibs}>.
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=item *
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L<File::Copy> has been upgraded from version 2.29 to 2.30.
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The documentation now notes that C<copy> will not overwrite read-only files.
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=item *
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L<Module::CoreList> has been upgraded from version 3.11 to 5.020001.
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The list of Perl versions covered has been updated.
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=item *
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The PathTools module collection has been upgraded from version 3.47 to 3.48.
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Fallbacks are now in place when cross-compiling for Android and
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C<$Config::Config{sh}> is not yet defined.
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L<[perl #121963]|https://rt.perl.org/Ticket/Display.html?id=121963>
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=item *
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L<PerlIO::via> has been upgraded from version 0.14 to 0.15.
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A minor portability improvement has been made to the XS implementation.
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=item *
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L<Unicode::UCD> has been upgraded from version 0.57 to 0.58.
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The documentation includes many clarifications and fixes.
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=item *
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L<utf8> has been upgraded from version 1.13 to 1.13_01.
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The documentation has some minor formatting improvements.
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=item *
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L<version> has been upgraded from version 0.9908 to 0.9909.
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External libraries and Perl may have different ideas of what the locale is.
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This is problematic when parsing version strings if the locale's numeric
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separator has been changed. Version parsing has been patched to ensure it
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handles the locales correctly.
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L<[perl #121930]|https://rt.perl.org/Ticket/Display.html?id=121930>
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=back
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=head1 Documentation
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=head2 Changes to Existing Documentation
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=head3 L<perlapi>
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=over 4
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=item *
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C<av_len> - Emphasize that this returns the highest index in the array, not the
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size of the array.
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L<[perl #120386]|https://rt.perl.org/Ticket/Display.html?id=120386>
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=item *
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Note that C<SvSetSV> doesn't do set magic.
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=item *
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C<sv_usepvn_flags> - Fix documentation to mention the use of C<NewX> instead of
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C<malloc>.
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L<[perl #121869]|https://rt.perl.org/Ticket/Display.html?id=121869>
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=item *
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Clarify where C<NUL> may be embedded or is required to terminate a string.
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=back
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=head3 L<perlfunc>
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=over 4
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=item *
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Clarify the meaning of C<-B> and C<-T>.
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=item *
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C<-l> now notes that it will return false if symlinks aren't supported by the
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file system.
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L<[perl #121523]|https://rt.perl.org/Ticket/Display.html?id=121523>
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=item *
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Note that C<each>, C<keys> and C<values> may produce different orderings for
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tied hashes compared to other perl hashes.
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L<[perl #121404]|https://rt.perl.org/Ticket/Display.html?id=121404>
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=item *
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Note that C<exec LIST> and C<system LIST> may fall back to the shell on Win32.
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Only C<exec PROGRAM LIST> and C<system PROGRAM LIST> indirect object syntax
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will reliably avoid using the shell. This has also been noted in L<perlport>.
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L<[perl #122046]|https://rt.perl.org/Ticket/Display.html?id=122046>
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=item *
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Clarify the meaning of C<our>.
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L<[perl #122132]|https://rt.perl.org/Ticket/Display.html?id=122132>
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=back
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=head3 L<perlguts>
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=over 4
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=item *
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Explain various ways of modifying an existing SV's buffer.
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L<[perl #116925]|https://rt.perl.org/Ticket/Display.html?id=116925>
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=back
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=head3 L<perlpolicy>
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=over 4
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=item *
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We now have a code of conduct for the I<< p5p >> mailing list, as documented in
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L<< perlpolicy/STANDARDS OF CONDUCT >>.
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=back
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=head3 L<perlre>
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=over 4
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=item *
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The C</x> modifier has been clarified to note that comments cannot be continued
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onto the next line by escaping them.
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=back
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=head3 L<perlsyn>
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=over 4
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=item *
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Mention the use of empty conditionals in C<for>/C<while> loops for infinite
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loops.
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=back
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=head3 L<perlxs>
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=over 4
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=item *
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Added a discussion of locale issues in XS code.
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=back
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=head1 Diagnostics
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The following additions or changes have been made to diagnostic output,
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including warnings and fatal error messages. For the complete list of
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diagnostic messages, see L<perldiag>.
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=head2 Changes to Existing Diagnostics
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=over 4
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=item *
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L<Variable length lookbehind not implemented in regex mE<sol>%sE<sol>|perldiag/"Variable length lookbehind not implemented in regex m/%s/">
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Information about Unicode behaviour has been added.
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=back
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=head1 Configuration and Compilation
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=over 4
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=item *
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Building Perl no longer writes to the source tree when configured with
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F<Configure>'s B<-Dmksymlinks> option.
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L<[perl #121585]|https://rt.perl.org/Ticket/Display.html?id=121585>
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=back
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=head1 Platform Support
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=head2 Platform-Specific Notes
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=over 4
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=item Android
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Build support has been improved for cross-compiling in general and for Android
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in particular.
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=item OpenBSD
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Corrected architectures and version numbers used in configuration hints when
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building Perl.
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=item Solaris
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B<c99> options have been cleaned up, hints look for B<solstudio> as well as
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B<SUNWspro>, and support for native C<setenv> has been added.
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=item VMS
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An old bug in feature checking, mainly affecting pre-7.3 systems, has been
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fixed.
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=item Windows
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C<%I64d> is now being used instead of C<%lld> for MinGW.
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=back
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=head1 Internal Changes
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=over 4
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=item *
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Added L<perlapi/sync_locale>.
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Changing the program's locale should be avoided by XS code. Nevertheless,
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certain non-Perl libraries called from XS, such as C<Gtk> do so. When this
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happens, Perl needs to be told that the locale has changed. Use this function
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to do so, before returning to Perl.
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=back
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=head1 Selected Bug Fixes
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=over 4
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=item *
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A bug has been fixed where zero-length assertions and code blocks inside of a
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regex could cause C<pos> to see an incorrect value.
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L<[perl #122460]|https://rt.perl.org/Ticket/Display.html?id=122460>
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=item *
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Using C<s///e> on tainted utf8 strings could issue bogus "Malformed UTF-8
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character (unexpected end of string)" warnings. This has now been fixed.
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L<[perl #122148]|https://rt.perl.org/Ticket/Display.html?id=122148>
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=item *
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C<system> and friends should now work properly on more Android builds.
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Due to an oversight, the value specified through B<-Dtargetsh> to F<Configure>
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would end up being ignored by some of the build process. This caused perls
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cross-compiled for Android to end up with defective versions of C<system>,
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C<exec> and backticks: the commands would end up looking for F</bin/sh> instead
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of F</system/bin/sh>, and so would fail for the vast majority of devices,
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leaving C<$!> as C<ENOENT>.
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=item *
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Many issues have been detected by L<Coverity|http://www.coverity.com/> and
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fixed.
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=back
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=head1 Acknowledgements
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Perl 5.20.1 represents approximately 4 months of development since Perl 5.20.0
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and contains approximately 12,000 lines of changes across 170 files from 36
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authors.
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Excluding auto-generated files, documentation and release tools, there were
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approximately 2,600 lines of changes to 110 .pm, .t, .c and .h files.
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Perl continues to flourish into its third decade thanks to a vibrant community
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of users and developers. The following people are known to have contributed
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the improvements that became Perl 5.20.1:
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Aaron Crane, Abigail, Alberto Simões, Alexandr Ciornii, Alexandre (Midnite)
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Jousset, Andrew Fresh, Andy Dougherty, Brian Fraser, Chris 'BinGOs' Williams,
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Craig A. Berry, Daniel Dragan, David Golden, David Mitchell, H.Merijn Brand,
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James E Keenan, Jan Dubois, Jarkko Hietaniemi, John Peacock, kafka, Karen
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Etheridge, Karl Williamson, Lukas Mai, Matthew Horsfall, Michael Bunk, Peter
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Martini, Rafael Garcia-Suarez, Reini Urban, Ricardo Signes, Shirakata Kentaro,
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Smylers, Steve Hay, Thomas Sibley, Todd Rinaldo, Tony Cook, Vladimir Marek,
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Yves Orton.
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The list above is almost certainly incomplete as it is automatically generated
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from version control history. In particular, it does not include the names of
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the (very much appreciated) contributors who reported issues to the Perl bug
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tracker.
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Many of the changes included in this version originated in the CPAN modules
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included in Perl's core. We're grateful to the entire CPAN community for
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helping Perl to flourish.
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For a more complete list of all of Perl's historical contributors, please see
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the F<AUTHORS> file in the Perl source distribution.
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=head1 Reporting Bugs
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If you find what you think is a bug, you might check the articles recently
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posted to the comp.lang.perl.misc newsgroup and the perl bug database at
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https://rt.perl.org/ . There may also be information at http://www.perl.org/ ,
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the Perl Home Page.
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If you believe you have an unreported bug, please run the L<perlbug> program
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included with your release. Be sure to trim your bug down to a tiny but
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sufficient test case. Your bug report, along with the output of C<perl -V>,
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will be sent off to perlbug@perl.org to be analysed by the Perl porting team.
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If the bug you are reporting has security implications, which make it
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inappropriate to send to a publicly archived mailing list, then please send it
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to perl5-security-report@perl.org. This points to a closed subscription
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unarchived mailing list, which includes all the core committers, who will be
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able to help assess the impact of issues, figure out a resolution, and help
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co-ordinate the release of patches to mitigate or fix the problem across all
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platforms on which Perl is supported. Please only use this address for
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security issues in the Perl core, not for modules independently distributed on
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CPAN.
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=head1 SEE ALSO
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The F<Changes> file for an explanation of how to view exhaustive details on
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what changed.
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The F<INSTALL> file for how to build Perl.
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The F<README> file for general stuff.
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The F<Artistic> and F<Copying> files for copyright information.
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=cut
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