=encoding utf8

=head1 NAME

perldelta - what is new for perl v5.31.8

=head1 DESCRIPTION

This document describes differences between the 5.31.7 release and the 5.31.8
release.

If you are upgrading from an earlier release such as 5.31.6, first read
L<perl5317delta>, which describes differences between 5.31.6 and 5.31.7.

=head1 Notice

We are now in the Contentious Changes Freeze portion of the 5.31.X release
cycle.

=head1 Performance Enhancements

=over 4

=item *

C<my_strnlen> has been sped up for systems that don't have their own
C<strnlen> implementation.

=item *

C<grok_bin_oct_hex> (and so, C<grok_bin>, C<grok_oct>, and C<grok_hex>)
have been sped up.

=item *

C<grok_number_flags> has been sped up.

=back

=head1 Modules and Pragmata

=head2 Updated Modules and Pragmata

=over 4

=item *

L<autodie> has been upgraded from version 2.29 to 2.32.

=item *

L<DB_File> has been upgraded from version 1.852 to 1.853.

=item *

L<Encode> has been upgraded from version 3.01 to 3.02.

=item *

L<ExtUtils::MakeMaker> has been upgraded from version 7.42 to 7.44.

=item *

L<Hash::Util> has been upgraded from version 0.22 to 0.23.

The Synopsis has been updated as the example code stopped working with
newer perls.

[L<GH #17399|https://github.com/Perl/perl5/issues/17399>]

=item *

L<IO> has been upgraded from version 1.41 to 1.42.

=item *

L<Module::CoreList> has been upgraded from version 5.20191220 to 5.20200120.

=item *

L<podlators> has been upgraded from version 4.12 to 4.14.

=item *

L<POSIX> has been upgraded from version 1.90 to 1.91.

=item *

L<Term::ANSIColor> has been upgraded from version 4.06 to 5.01.

=item *

L<Test::Simple> has been upgraded from version 1.302170 to 1.302171.

=item *

L<XS::APItest> has been upgraded from version 1.05 to 1.06.

=back

=head1 Documentation

=head2 Changes to Existing Documentation

We have attempted to update the documentation to reflect the changes
listed in this document.  If you find any we have missed, send email
to L<https://github.com/Perl/perl5/issues>.

Additionally, the following selected changes have been made:

=head3 L<perlapi>

=over 4

=item *

C<sv_2pvbyte> updated to mention it will croak if the SV cannot be
downgraded.

=item *

C<sv_setpvn> updated to mention that the UTF-8 flag will not be changed by
this function, and a terminating NUL byte is guaranteed.

=item *

Documentation for C<PL_phase> has been added.

=item *

The documentation for C<grok_bin>, C<grok_oct>, and C<grok_hex> has been
updated and clarified.

=back

=head3 L<perlguts>

=over 4

=item *

Don't suggest using perl's C<malloc> anymore. Modern system C<malloc> is
assumed to be much better than perl's implementation at this point.

=back

=head3 L<perlintro>

=over 4

=item *

The docs for the repetition operator C<x> have been clarified

[L<GH #17335|https://github.com/Perl/perl5/issues/17335>]

=back

=head3 L<perlipc>

=over 4

=item *

The documentation surrounding C<open> and handle usage has been modernized
to prefer 3-arg open and lexical variables instead of barewords.

=item *

Various updates and fixes including making all examples strict-safe and
replacing C<-w> with C<use warnings>.

=back

=head3 L<perlport>

=over 4

=item *

Update C<timegm> example to use correct year format I<1970> instead of I<70>.

[L<GH #16431|https://github.com/Perl/perl5/issues/16431>]

=back

=head3 L<perlvar>

=over 4

=item *

Recommend stringifying C<$]> and comparing it numerically.

=back

=head3 L<perlxs>

=over 4

=item *

Suggest using libffi for simple library bindings.

=back

=head3 L<POSIX>

=over 4

=item *

C<setlocale> warning about threaded builds updated to note it does not
apply on Perl 5.28.X and later.

=item *

C<< Posix::SigSet->new(...) >> updated to state it throws an error if any of
the supplied signals cannot be added to the set.

=back

=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<perldiag>.

=head2 Changes to Existing Diagnostics

=over 4

=item *

The "Code point 0x%X is not Unicode, and not portable" warning removed
the line "Code points above 0xFFFF_FFFF require larger than a 32 bit word."
as code points that large are no longer legal on 32-bit platforms.

=back

=head1 Configuration and Compilation

=over 4

=item *

For clang++, add C<< #include <stdlib.h> >> to Configure's probes for
C<futimes>, C<strtoll>, C<strtoul>, C<strtoull>, C<strtouq>, otherwise the
probes would fail to compile.

=item *

Use a compile and run test for C<lchown> to satisfy clang++ which should
more reliably detect it.

=item *

For C++ compilers, add C<< #include <stdio.h> >> to Configure's probes for
C<getpgrp> and C<setpgrp> as they use printf and C++ compilers may fail
compilation instead of just warning.

=back

=head1 Testing

Tests were added and changed to reflect the other additions and
changes in this release.  Furthermore, these significant changes were
made:

=over 4

=item *

Certain test output of scalars containing control characters and Unicode
has been fixed on EBCDIC.

=back

=head1 Platform Support

=head2 Platform-Specific Notes

=over 4

=item NetBSD 8.0

Fix compilation of Perl on NetBSD 8.0 with g++.

[L<GH #17381|https://github.com/Perl/perl5/issues/17381>]

=item Solaris

Configure now uses the detected types for gethostby* functions, allowing
Perl to once again compile on certain configurations of Solaris.

=back

=head1 Internal Changes

=over 4

=item *

C<savepvn>'s len parameter is now a C<Size_t> instead of an C<I32> since we
can handle longer strings than 31 bits.

=back

=head1 Selected Bug Fixes

=over 4

=item *

A heap-buffer-overflow has been fixed in the regular expression engine.

[L<GH #17384|https://github.com/Perl/perl5/issues/17384>]

=item *

Fix an assertion failure in the regular expression engine.

[L<GH #17372|https://github.com/Perl/perl5/issues/17372>]

=item *

Fix regression in C<tr///> added somewhere in v5.31.6.

[L<GH #17391|https://github.com/Perl/perl5/issues/17391>]

=item *

Fix coredump in pp_hot.c after C<B::UNOP_AUX::aux_list()>.

[L<GH #17301|https://github.com/Perl/perl5/issues/17301>]

=item *

Commit bc62bf8519  ("Add some defensive coding to av_store()" has been
reverted as it broke I<List-UtilsBy-XS-0.05> in v5.31.2.

[L<GH #17265|https://github.com/Perl/perl5/issues/17265>]

=item *

Loading IO is now threadsafe.

[L<GH #14816|https://github.com/Perl/perl5/issues/14816>]

=back

=head1 Acknowledgements

Perl 5.31.8 represents approximately 4 weeks of development since Perl
5.31.7 and contains approximately 16,000 lines of changes across 400 files
from 25 authors.

Excluding auto-generated files, documentation and release tools, there were
approximately 8,300 lines of changes to 260 .pm, .t, .c and .h files.

Perl continues to flourish into its fourth decade thanks to a vibrant
community of users and developers. The following people are known to have
contributed the improvements that became Perl 5.31.8:

Andy Dougherty, Bernhard M. Wiedemann, Chad Granum, Chase Whitener, Chris
'BinGOs' Williams, Craig A. Berry, Dan Book, Dan Kogai, David Mitchell,
Felipe Gasper, Hugo van der Sanden, James E Keenan, Karl Williamson, Matthew
Horsfall, Nicholas Clark, Nicolas R., Ricardo Signes, Russ Allbery, Santtu
Ojanperä, Slaven Rezic, Smylers, Todd Rinaldo, Tomasz Konojacki, Tony Cook,
Yves Orton.

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.

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.

For a more complete list of all of Perl's historical contributors, please
see the F<AUTHORS> file in the Perl source distribution.

=head1 Reporting Bugs

If you find what you think is a bug, you might check the perl bug database
at L<https://github.com/Perl/perl5/issues>.  There may also be information at
L<http://www.perl.org/>, the Perl Home Page.

If you believe you have an unreported bug, please open an issue at
L<https://github.com/Perl/perl5/issues>.  Be sure to trim your bug down to a
tiny but sufficient test case.

If the bug you are reporting has security implications which make it
inappropriate to send to a public issue tracker, then see
L<perlsec/SECURITY VULNERABILITY CONTACT INFORMATION>
for details of how to report the issue.

=head1 Give Thanks

If you wish to thank the Perl 5 Porters for the work we had done in Perl 5,
you can do so by running the C<perlthanks> program:

    perlthanks

This will send an email to the Perl 5 Porters list with your show of thanks.

=head1 SEE ALSO

The F<Changes> file for an explanation of how to view 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