| 1 | =encoding utf8 |
| 2 | |
| 3 | =head1 NAME |
| 4 | |
| 5 | perl5161delta - what is new for perl v5.16.1 |
| 6 | |
| 7 | =head1 DESCRIPTION |
| 8 | |
| 9 | This document describes differences between the 5.16.0 release and |
| 10 | the 5.16.1 release. |
| 11 | |
| 12 | If you are upgrading from an earlier release such as 5.14.0, first read |
| 13 | L<perl5160delta>, which describes differences between 5.14.0 and |
| 14 | 5.16.0. |
| 15 | |
| 16 | =head1 Security |
| 17 | |
| 18 | =head2 an off-by-two error in Scalar-List-Util has been fixed |
| 19 | |
| 20 | The bugfix was in Scalar-List-Util 1.23_04, and perl 5.16.1 includes |
| 21 | Scalar-List-Util 1.25. |
| 22 | |
| 23 | =head1 Incompatible Changes |
| 24 | |
| 25 | There are no changes intentionally incompatible with 5.16.0 If any |
| 26 | exist, they are bugs, and we request that you submit a report. See |
| 27 | L</Reporting Bugs> below. |
| 28 | |
| 29 | =head1 Modules and Pragmata |
| 30 | |
| 31 | =head2 Updated Modules and Pragmata |
| 32 | |
| 33 | =over 4 |
| 34 | |
| 35 | =item * |
| 36 | |
| 37 | L<Scalar::Util> and L<List::Util> have been upgraded from version 1.23 to |
| 38 | version 1.25. |
| 39 | |
| 40 | =item * |
| 41 | |
| 42 | L<B::Deparse> has been updated from version 1.14 to 1.14_01. An |
| 43 | "uninitialized" warning emitted by B::Deparse has been squashed |
| 44 | [perl #113464]. |
| 45 | |
| 46 | =back |
| 47 | |
| 48 | =head1 Configuration and Compilation |
| 49 | |
| 50 | =over |
| 51 | |
| 52 | =item * |
| 53 | |
| 54 | Building perl with some Windows compilers used to fail due to a problem |
| 55 | with miniperl's C<glob> operator (which uses the C<perlglob> program) |
| 56 | deleting the PATH environment variable [perl #113798]. |
| 57 | |
| 58 | =back |
| 59 | |
| 60 | =head1 Platform Support |
| 61 | |
| 62 | =head2 Platform-Specific Notes |
| 63 | |
| 64 | =over 4 |
| 65 | |
| 66 | =item VMS |
| 67 | |
| 68 | All C header files from the top-level directory of the distribution are now |
| 69 | installed on VMS, providing consistency with a long-standing practice on other |
| 70 | platforms. Previously only a subset were installed, which broke non-core extension |
| 71 | builds for extensions that depended on the missing include files. |
| 72 | |
| 73 | =back |
| 74 | |
| 75 | =head1 Selected Bug Fixes |
| 76 | |
| 77 | =over 4 |
| 78 | |
| 79 | =item * |
| 80 | |
| 81 | A regression introduced in Perl v5.16.0 involving |
| 82 | C<tr/I<SEARCHLIST>/I<REPLACEMENTLIST>/> has been fixed. Only the first |
| 83 | instance is supposed to be meaningful if a character appears more than |
| 84 | once in C<I<SEARCHLIST>>. Under some circumstances, the final instance |
| 85 | was overriding all earlier ones. [perl #113584] |
| 86 | |
| 87 | =item * |
| 88 | |
| 89 | C<B::COP::stashlen> has been added. This provides access to an internal |
| 90 | field added in perl 5.16 under threaded builds. It was broken at the last |
| 91 | minute before 5.16 was released [perl #113034]. |
| 92 | |
| 93 | =item * |
| 94 | |
| 95 | The L<re> pragma will no longer clobber C<$_>. [perl #113750] |
| 96 | |
| 97 | =item * |
| 98 | |
| 99 | Unicode 6.1 published an incorrect alias for one of the |
| 100 | Canonical_Combining_Class property's values (which range between 0 and |
| 101 | 254). The alias C<CCC133> should have been C<CCC132>. Perl now |
| 102 | overrides the data file furnished by Unicode to give the correct value. |
| 103 | |
| 104 | =item * |
| 105 | |
| 106 | Duplicating scalar filehandles works again. [perl #113764] |
| 107 | |
| 108 | =item * |
| 109 | |
| 110 | Under threaded perls, a runtime code block in a regular expression could |
| 111 | corrupt the package name stored in the op tree, resulting in bad reads |
| 112 | in C<caller>, and possibly crashes [perl #113060]. |
| 113 | |
| 114 | =item * |
| 115 | |
| 116 | For efficiency's sake, many operators and built-in functions return the |
| 117 | same scalar each time. Lvalue subroutines and subroutines in the CORE:: |
| 118 | namespace were allowing this implementation detail to leak through. |
| 119 | C<print &CORE::uc("a"), &CORE::uc("b")> used to print "BB". The same thing |
| 120 | would happen with an lvalue subroutine returning the return value of C<uc>. |
| 121 | Now the value is copied in such cases [perl #113044]. |
| 122 | |
| 123 | =item * |
| 124 | |
| 125 | C<__SUB__> now works in special blocks (C<BEGIN>, C<END>, etc.). |
| 126 | |
| 127 | =item * |
| 128 | |
| 129 | Formats that reference lexical variables from outside no longer result |
| 130 | in crashes. |
| 131 | |
| 132 | =back |
| 133 | |
| 134 | =head1 Known Problems |
| 135 | |
| 136 | There are no new known problems, but consult L<perl5160delta/Known |
| 137 | Problems> to see those identified in the 5.16.0 release. |
| 138 | |
| 139 | =head1 Acknowledgements |
| 140 | |
| 141 | Perl 5.16.1 represents approximately 2 months of development since Perl |
| 142 | 5.16.0 and contains approximately 14,000 lines of changes across 96 |
| 143 | files from 8 authors. |
| 144 | |
| 145 | Perl continues to flourish into its third decade thanks to a vibrant |
| 146 | community of users and developers. The following people are known to |
| 147 | have contributed the improvements that became Perl 5.16.1: |
| 148 | |
| 149 | Chris 'BinGOs' Williams, Craig A. Berry, Father Chrysostomos, Karl |
| 150 | Williamson, Paul Johnson, Reini Urban, Ricardo Signes, Tony Cook. |
| 151 | |
| 152 | The list above is almost certainly incomplete as it is automatically |
| 153 | generated from version control history. In particular, it does not |
| 154 | include the names of the (very much appreciated) contributors who |
| 155 | reported issues to the Perl bug tracker. |
| 156 | |
| 157 | Many of the changes included in this version originated in the CPAN |
| 158 | modules included in Perl's core. We're grateful to the entire CPAN |
| 159 | community for helping Perl to flourish. |
| 160 | |
| 161 | For a more complete list of all of Perl's historical contributors, |
| 162 | please see the F<AUTHORS> file in the Perl source distribution. |
| 163 | |
| 164 | =head1 Reporting Bugs |
| 165 | |
| 166 | If you find what you think is a bug, you might check the articles |
| 167 | recently posted to the comp.lang.perl.misc newsgroup and the perl |
| 168 | bug database at http://rt.perl.org/perlbug/ . There may also be |
| 169 | information at http://www.perl.org/ , the Perl Home Page. |
| 170 | |
| 171 | If you believe you have an unreported bug, please run the L<perlbug> |
| 172 | program included with your release. Be sure to trim your bug down |
| 173 | to a tiny but sufficient test case. Your bug report, along with the |
| 174 | output of C<perl -V>, will be sent off to perlbug@perl.org to be |
| 175 | analysed by the Perl porting team. |
| 176 | |
| 177 | If the bug you are reporting has security implications, which make it |
| 178 | inappropriate to send to a publicly archived mailing list, then please |
| 179 | send it to perl5-security-report@perl.org. This points to a closed |
| 180 | subscription unarchived mailing list, which includes all the core |
| 181 | committers, who will be able to help assess the impact of issues, figure |
| 182 | out a resolution, and help co-ordinate the release of patches to |
| 183 | mitigate or fix the problem across all platforms on which Perl is |
| 184 | supported. Please only use this address for security issues in the Perl |
| 185 | core, not for modules independently distributed on CPAN. |
| 186 | |
| 187 | =head1 SEE ALSO |
| 188 | |
| 189 | The F<Changes> file for an explanation of how to view exhaustive details |
| 190 | on what changed. |
| 191 | |
| 192 | The F<INSTALL> file for how to build Perl. |
| 193 | |
| 194 | The F<README> file for general stuff. |
| 195 | |
| 196 | The F<Artistic> and F<Copying> files for copyright information. |
| 197 | |
| 198 | =cut |