X-Git-Url: https://perl5.git.perl.org/perl5.git/blobdiff_plain/1d6d94adb5721d9038fa6aa00840e7327a365b99..d005d3c3ee5a7a24dbca1fc4a1d251e86eccb6ed:/pod/perldelta.pod diff --git a/pod/perldelta.pod b/pod/perldelta.pod index 2d5a52b..f97c710 100644 --- a/pod/perldelta.pod +++ b/pod/perldelta.pod @@ -2,440 +2,417 @@ =head1 NAME -perldelta - what is new for perl v5.23.6 +[ 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 v5.23.7 =head1 DESCRIPTION -This document describes differences between the 5.23.5 release and the 5.23.6 +This document describes differences between the 5.23.6 release and the 5.23.7 release. -If you are upgrading from an earlier release such as 5.23.4, first read -L, which describes differences between 5.23.4 and 5.23.5. +If you are upgrading from an earlier release such as 5.23.5, first read +L, which describes differences between 5.23.5 and 5.23.6. -=head1 Incompatible Changes +=head1 Notice -=head2 Regular expression compilation errors +XXX Any important notices here -Some regular expression patterns that had runtime errors now -don't compile at all. +=head1 Core Enhancements -This should have been in the perldelta for 5.23.4, but was omitted. +XXX New core language features go here. Summarize user-visible core language +enhancements. Particularly prominent performance optimisations could go +here, but most should go in the L section. -Almost all Unicode properties using the C<\p{}> and C<\P{}> regular -expression pattern constructs are now checked for validity at pattern -compilation time, and invalid ones will cause the program to not -compile. In earlier releases, this check was often deferred until run -time. Whenever an error check is moved from run- to compile time, -erroneous code is caught 100% of the time, whereas before it would only -get caught if and when the offending portion actually gets executed, -which for unreachable code might be never. +[ List each enhancement as a =head2 entry ] -=head1 Deprecations +=head1 Security -=head2 Using code points above the platform's C is now -deprecated - -Unicode defines code points in the range C<0..0x10FFFF>. Some standards -at one time defined them up to 2**31 - 1, but Perl has allowed them to -be as high as anything that will fit in a word on the platform being -used. However, use of those above the platform's C is broken in -some constructs, notably C, regular expression patterns involving -quantifiers, and in some arithmetic and comparison operations, such as -being the upper limit of a loop. Now the use of such code points raises -a deprecation warning, unless that warning category is turned off. -C is typically 2**31 -1 on 32-bit platforms, and 2**63-1 on -64-bit ones. - -=head2 Doing bitwise operations on strings containing code points above -0xFF is deprecated - -The string bitwise operators treat their operands as strings of bytes, -and values beyond 0xFF are nonsensical in this context. To operate on -encoded bytes, first encode the strings. To operate on code points' -numeric values, use C and C. In the future, this -warning will be replaced by an exception. +XXX Any security-related notices go here. In particular, any security +vulnerabilities closed should be noted here rather than in the +L section. -=head1 Performance Enhancements +[ List each security issue as a =head2 entry ] -=over 4 +=head1 Incompatible Changes -=item * +XXX For a release on a stable branch, this section aspires to be: -Many languages, such as Chinese, are caseless. Perl now knows about -most modern commercially important ones, and skips much of the work when -a program tries to change case in them (like C) or match -caselessly (C). This will speed up a program, such as a web -server, that can operate on multiple languages, while operating on a -caseless one. + There are no changes intentionally incompatible with 5.XXX.XXX + If any exist, they are bugs, and we request that you submit a + report. See L below. -=back +[ List each incompatible change as a =head2 entry ] -=head1 Modules and Pragmata +=head2 C is now tailored to Perl expectations -=head2 Updated Modules and Pragmata +This is now more suited to be a drop-in replacement for plain C<\b>, but +giving better results for parsing natural language. Previously it +strictly followed the current Unicode rules which calls for it to match +between each white space character. Now it doesn't generally match +within spans of white space, behaving like C<\b> does. See +L -=over 4 +=head1 Deprecations -=item * +XXX Any deprecated features, syntax, modules etc. should be listed here. -L has been upgraded from version 1.35 to 1.36. +=head2 Module removals -Uses of C<< < > >> are now always deparsed as either C or -C, and uses of C or C are never deparsed as -C<< < > >>. This fixes the deparsing of C. -L<[perl #116677]|https://rt.perl.org/Ticket/Display.html?id=116677> +XXX Remove this section if inapplicable. -=item * +The following modules will be removed from the core distribution in a +future release, and will at that time need to be installed from CPAN. +Distributions on CPAN which require these modules will need to list them as +prerequisites. -L has been upgraded from version 0.017-TRIAL to 0.018, -with no change since 0.017. +The core versions of these modules will now issue C<"deprecated">-category +warnings to alert you to this fact. To silence these deprecation warnings, +install the modules in question from CPAN. -=item * +Note that these are (with rare exceptions) fine modules that you are encouraged +to continue to use. Their disinclusion from core primarily hinges on their +necessity to bootstrapping a fully functional, CPAN-capable Perl installation, +not usually on concerns over their design. -L has been upgraded from version 2.133 to 2.140. +=over -Adds a method for getting structured requirements and adds better error -messages. +=item XXX -=item * +XXX Note that deprecated modules should be listed here even if they are listed +as an updated module in the L section. -L has been upgraded from version 2.158 to 2.159. +=back -This adds a "Trailingcomma" option, which when enabled adds a trailing comma -after the last element of dumped arrays and hashes that would otherwise be -followed immediately by a line break. -L<[perl #126813]|https://rt.perl.org/Ticket/Display.html?id=126813> +[ List each other deprecation as a =head2 entry ] -The internals have also been substantially refactored and cleaned up. It -may be more efficient on some platforms. +=head1 Performance Enhancements -=item * +XXX Changes which enhance performance without changing behaviour go here. +There may well be none in a stable release. -L has been upgraded from version 1.36 to 1.37. +[ List each enhancement as a =item entry ] -Fixed an else nesting issue in dynamic loading support for OS/390 (and -similar systems) that was introduced in 1.36. +=over 4 =item * -L and L have been upgraded from version 3.59 to 3.60, -adding L. +XXX -=item * +=back -L has been upgraded from version 1.18 to 1.19. +=head1 Modules and Pragmata -=item * +XXX All changes to installed files in F, F, F and F +go here. If Module::CoreList is updated, generate an initial draft of the +following sections using F. A paragraph summary +for important changes should then be added by hand. In an ideal world, +dual-life modules would have a F file that could be cribbed. -L has been upgraded from version 3.36 to 3.37. +[ Within each section, list entries as a =item entry ] -=item * +=head2 New Modules and Pragmata -L has been updated from version 0.37 to 0.38. +=over 4 =item * -L has been updated from version 1.000030-TRIAL to -1.000031-TRIAL, with no functional changes. - -=item * +XXX -L has been upgraded from version 4.03 to 4.04, with no -functional changes. +=back -=item * +=head2 Updated Modules and Pragmata -L has been updated from version 1.23 to 1.24, with -no functional changes. +=over 4 =item * -L has been upgraded from version 1.09 to 1.10, with only a -documentation change. +L has been upgraded from version 5.20151220 to 5.20160120. =item * -L has been upgraded from version 2.04 to 2.05. +The F bundle has been upgraded from version 2.28 to 4.04. -=item * +=back -L has been upgraded from version 1.17 to 1.18. +=head2 Removed Modules and Pragmata -Partly reverted a micro-optimization to F that -caused self-recursion when it was loaded with C<${^ENCODING}> set. -L<[perl #126593]|https://rt.perl.org/Ticket/Display.html?id=126593> +=over 4 =item * -The modules L, L, and the perl debugger could have, under -rare circumstances, output raw control characters. This has been fixed. +XXX =back =head1 Documentation +XXX Changes to files in F go here. Consider grouping entries by +file and be sure to link to the appropriate page, e.g. L. + +=head2 New Documentation + +XXX Changes which create B files in F go here. + +=head3 L + +XXX Description of the purpose of the new file here + =head2 Changes to Existing Documentation -=head3 L +XXX Changes which significantly change existing files in F go here. +However, any changes to F should go in the L +section. + +=head3 L =over 4 =item * -The documentation of C has been revised to clarify valid inputs. +XXX Description of the change here =back -=head3 L +=head1 Diagnostics + +The following additions or changes have been made to diagnostic output, +including warnings and fatal error messages. For the complete list of +diagnostic messages, see L. + +XXX New or changed warnings emitted by the core's C code go here. Also +include any changes in L that reconcile it to the C code. + +=head2 New Diagnostics + +XXX Newly added diagnostic messages go under here, separated into New Errors +and New Warnings + +=head3 New Errors =over 4 =item * -The documentation of C now describes how C<$?> is affected. +XXX L =back -=head3 L +=head3 New Warnings =over 4 =item * -The documentation of C<$@> was reworded to clarify that it is not just for -syntax errors in C. -L<[perl #124034]|https://rt.perl.org/Ticket/Display.html?id=124034> +XXX L =back -=head3 L +=head2 Changes to Existing Diagnostics + +XXX Changes (i.e. rewording) of diagnostic messages go here =over 4 =item * -The documentation of C has been clarified; they are I -by default, not I. +Accessing the C part of a glob as C instead of C is no +longer deprecated. It is discouraged to encourage uniformity (so that, for +example, one can grep more easily) but it will not be removed. [perl #127060] =back -=head1 Diagnostics +=head1 Utility Changes -The following additions or changes have been made to diagnostic output, -including warnings and fatal error messages. For the complete list of -diagnostic messages, see L. +XXX Changes to installed programs such as F and F go here. +Most of these are built within the directory F. -=head2 New Diagnostics +[ 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. ] -=head3 New Errors +=head2 L =over 4 =item * -L - -(F) You supplied a number to the -C option that either has extra leading -zeroes or overflows perl's unsigned integer representation. +XXX =back =head1 Configuration and Compilation +XXX Changes to F, F, F, and analogous tools +go here. Any other changes to the Perl build process should be listed here. +However, any platform-specific changes should be listed in the +L section, instead. + +[ List changes as a =item entry ]. + =over 4 =item * -F is no longer inappropriately silent. This was caused -by an operator precedence error introduced in 5.23.4. +F no longer probes for F by default. Originally +this was the "New Math" library, but the name has been re-used by the +GNOME NetworkManager. [perl #127131] =back -=head1 Platform Support +=head1 Testing -=head2 New Platforms +XXX Any significant changes to the testing of a freshly built perl should be +listed here. Changes which create B files in F go here as do any +large changes to the testing harness (e.g. when parallel testing was added). +Changes to existing files in F aren't worth summarizing, although the bugs +that they represent may be covered elsewhere. + +[ List each test improvement as a =item entry ] =over 4 -=item OpenIndiana +=item * -OpenIndiana (continuation of OpenSolaris) builds were not working due -to problems with the Perl shared library. This should be working now. -L<[perl #126958]|https://rt.perl.org/Ticket/Display.html?id=126958> +XXX =back -=head2 Platform-Specific Notes +=head1 Platform Support -=over 4 +XXX Any changes to platform support should be listed in the sections below. -=item EBCDIC platforms, such as z/OS +[ Within the sections, list each platform as a =item entry with specific +changes as paragraphs below it. ] -UTF-EBCDIC is like UTF-8, but for EBCDIC platforms. It now has been -extended so that it can represent code points up to 2 ** 64 - 1 on -platforms with 64-bit words. This brings it into parity with UTF-8. -This enhancement requires an incompatible change to the representation -of code points in the range 2 ** 30 to 2 ** 31 -1 (the latter was the -previous maximum representable code point). This means that a file that -contains one of these code points, written out with previous versions of -perl cannot be read in, without conversion, by a perl containing this -change. We do not believe any such files are in existence, but if you -do have one, submit a ticket at L, -and we will write a conversion script for you. +=head2 New Platforms -=item Cygwin +XXX List any platforms that this version of perl compiles on, that previous +versions did not. These will either be enabled by new files in the F +directories, or new subdirectories and F files at the top level of the +source tree. -Tests are more robust against unusual cygdrive prefixes. -L<[perl #126834]|https://rt.perl.org/Ticket/Display.html?id=126834> +=over 4 -=item OS X/Darwin +=item XXX-some-platform -Builds with both -DDEBUGGING and threading enabled would fail with a -"panic: free from wrong pool" error when built or tested from Terminal -on OS X. This was caused by perl's internal management of the -environment conflicting with an atfork handler using the libc -setenv() function to update the environment. +XXX -Perl now uses setenv()/unsetenv() to update the environment on OS X. -L<[perl #126240]|https://rt.perl.org/Ticket/Display.html?id=126240> +=back -=item ppc64el floating point +=head2 Discontinued Platforms -The floating point format of ppc64el (Debian naming for little-endian -PowerPC) is now detected correctly. +XXX List any platforms that this version of perl no longer compiles on. -=item Solaris +=over 4 -All Solaris now builds shared libperl. +=item XXX-some-platform -Solaris and variants like OpenIndiana now always build with the shared -Perl library (Configure -Duseshrplib). This was required for the -OpenIndiana builds, but this has also been the setting for Oracle/Sun -Perl builds for several years. +XXX =back -=head1 Internal Changes +=head2 Platform-Specific Notes -=over 4 +XXX List any changes for specific platforms. This could include configuration +and compilation changes or changes in portability/compatibility. However, +changes within modules for platforms should generally be listed in the +L section. -=item * +=over 4 -Perl core code and the threads extension have been annotated so that, -if Perl is configured to use threads, then during compile-time clang (3.6 -or later) will warn about suspicious uses of mutexes. -See L for more -information. +=item XXX-some-platform -=item * +XXX -The C emulation has been enhanced. This will help older -and/or more exotic platforms or configurations. +=back -=item * +=head1 Internal Changes -The C function is discouraged in favor of C, -C, C, and C. +XXX Changes which affect the interface available to C code go here. Other +significant internal changes for future core maintainers should be noted as +well. -=item * +[ List each change as a =item entry ] -EBCDIC code paths have largely been unified to avoid repetition. +=over 4 =item * -MSWin32 code for C<$^X> has been moved out of the F directory to -F, where other operating systems set that variable. +XXX =back =head1 Selected Bug Fixes -=over 4 +XXX Important bug fixes in the core language are summarized here. Bug fixes in +files in F and F are best summarized in L. -=item * +[ List each fix as a =item entry ] -C no longer crashes on utf8 strings. When C<\G> is a fixed number -of characters from the start of the regex, perl needs to count back that -many characters from the current C position and start matching from -there. However, it was counting back bytes rather than characters, which -could lead to panics on utf8 strings. +=over 4 =item * -In some cases operators that return integers would return negative -integers as large positive integers. -L<[perl #126635]|https://rt.perl.org/Ticket/Display.html?id=126635> +Calls to the placeholder C<&PL_sv_yes> used internally when an +import() or unimport() method isn't found now correctly handle scalar +context. [perl #126042] =item * -The C operator would assert for DEBUGGING builds instead of -producing the correct error message. The condition asserted on is -detected and reported on correctly without the assertions, so the -assertions were removed. -L<[perl #126480]|https://rt.perl.org/Ticket/Display.html?id=126480> +Fixed some problems introduced in 5.23.2 with list assignment dealing +with magic and XS functions returning their arguments. [perl #126633] =item * -In some cases, failing to parse a here-doc would attempt to use freed -memory. This was caused by a pointer not being restored correctly. -L<[perl #126443]|https://rt.perl.org/Ticket/Display.html?id=126443> +Report more context when we see an array where we expect to see an +operator. [perl #123737] =item * -C<< @x = sort { *a = 0; $a <=> $b } 0 .. 1 >> no longer frees the GP -for *a before restoring its SV slot. -L<[perl #124097]|https://rt.perl.org/Ticket/Display.html?id=124097> +Modifying an array that was previously a package C<@ISA> no longer +causes assertion failures or crashes. [perl #123788] -=item * +=back -Multiple problems with the new hexadecimal floating point printf -format C<%a> were fixed: -L<[perl #126582]|https://rt.perl.org/Ticket/Display.html?id=126582>, -L<[perl #126586]|https://rt.perl.org/Ticket/Display.html?id=126586>, -L<[perl #126822]|https://rt.perl.org/Ticket/Display.html?id=126822> +=head1 Known Problems -=item * +XXX Descriptions of platform agnostic bugs we know we can't fix go here. Any +tests that had to be Ced for the release would be noted here. Unfixed +platform specific bugs also go here. -Calling mg_set() in leave_scope() no longer leaks. +[ List each fix as a =item entry ] + +=over 4 =item * -A regression from Perl v5.20 was fixed in which debugging output of regular -expression compilation was wrong. (The pattern was correctly compiled, but -what got displayed for it was wrong.) +XXX =back -=head1 Acknowledgements +=head1 Errata From Previous Releases -Perl 5.23.6 represents approximately 4 weeks of development since Perl 5.23.5 -and contains approximately 11,000 lines of changes across 260 files from 22 -authors. +=over 4 + +=item * -Excluding auto-generated files, documentation and release tools, there were -approximately 7,500 lines of changes to 170 .pm, .t, .c and .h files. +XXX Add anything here that we forgot to add, or were mistaken about, in +the perldelta of a previous release. -Perl continues to flourish into its third decade thanks to a vibrant community -of users and developers. The following people are known to have contributed the -improvements that became Perl 5.23.6: +=back + +=head1 Obituary -Aaron Crane, Abigail, Achim Gratz, Andy Broad, Aristotle Pagaltzis, Chris -'BinGOs' Williams, Craig A. Berry, Dagfinn Ilmari Mannsåker, Daniel Dragan, -David Golden, David Mitchell, Doug Bell, Ed Avis, Jarkko Hietaniemi, Karen -Etheridge, Karl Williamson, Lukas Mai, Ricardo Signes, Shlomi Fish, Steve Hay, -Sullivan Beck, Tony Cook. +XXX If any significant core contributor has died, we've added a short obituary +here. -The list above is almost certainly incomplete as it is automatically generated -from version control history. In particular, it does not include the names of -the (very much appreciated) contributors who reported issues to the Perl bug -tracker. +=head1 Acknowledgements -Many of the changes included in this version originated in the CPAN modules -included in Perl's core. We're grateful to the entire CPAN community for -helping Perl to flourish. +XXX Generate this with: -For a more complete list of all of Perl's historical contributors, please see -the F file in the Perl source distribution. + perl Porting/acknowledgements.pl v5.23.6..HEAD =head1 Reporting Bugs