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+.\" -*- mode: troff; coding: utf-8 -*-
+.\" Automatically generated by Pod::Man 5.01 (Pod::Simple 3.43)
+.\"
+.\" Standard preamble:
+.\" ========================================================================
+.de Sp \" Vertical space (when we can't use .PP)
+.if t .sp .5v
+.if n .sp
+..
+.de Vb \" Begin verbatim text
+.ft CW
+.nf
+.ne \\$1
+..
+.de Ve \" End verbatim text
+.ft R
+.fi
+..
+.\" \*(C` and \*(C' are quotes in nroff, nothing in troff, for use with C<>.
+.ie n \{\
+. ds C` ""
+. ds C' ""
+'br\}
+.el\{\
+. ds C`
+. ds C'
+'br\}
+.\"
+.\" Escape single quotes in literal strings from groff's Unicode transform.
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\"
+.\" If the F register is >0, we'll generate index entries on stderr for
+.\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index
+.\" entries marked with X<> in POD. Of course, you'll have to process the
+.\" output yourself in some meaningful fashion.
+.\"
+.\" Avoid warning from groff about undefined register 'F'.
+.de IX
+..
+.nr rF 0
+.if \n(.g .if rF .nr rF 1
+.if (\n(rF:(\n(.g==0)) \{\
+. if \nF \{\
+. de IX
+. tm Index:\\$1\t\\n%\t"\\$2"
+..
+. if !\nF==2 \{\
+. nr % 0
+. nr F 2
+. \}
+. \}
+.\}
+.rr rF
+.\" ========================================================================
+.\"
+.IX Title "PERL5121DELTA 1"
+.TH PERL5121DELTA 1 2023-11-28 "perl v5.38.2" "Perl Programmers Reference Guide"
+.\" For nroff, turn off justification. Always turn off hyphenation; it makes
+.\" way too many mistakes in technical documents.
+.if n .ad l
+.nh
+.SH NAME
+perl5121delta \- what is new for perl v5.12.1
+.SH DESCRIPTION
+.IX Header "DESCRIPTION"
+This document describes differences between the 5.12.0 release and
+the 5.12.1 release.
+.PP
+If you are upgrading from an earlier release such as 5.10.1, first read
+perl5120delta, which describes differences between 5.10.0 and
+5.12.0.
+.SH "Incompatible Changes"
+.IX Header "Incompatible Changes"
+There are no changes intentionally incompatible with 5.12.0. If any
+incompatibilities with 5.12.0 exist, they are bugs. Please report them.
+.SH "Core Enhancements"
+.IX Header "Core Enhancements"
+Other than the bug fixes listed below, there should be no user-visible
+changes to the core language in this release.
+.SH "Modules and Pragmata"
+.IX Header "Modules and Pragmata"
+.SS "Pragmata Changes"
+.IX Subsection "Pragmata Changes"
+.IP \(bu 4
+We fixed exporting of \f(CW\*(C`is_strict\*(C'\fR and \f(CW\*(C`is_lax\*(C'\fR from version.
+.Sp
+These were being exported with a wrapper that treated them as method
+calls, which caused them to fail. They are just functions, are
+documented as such, and should never be subclassed, so this patch
+just exports them directly as functions without the wrapper.
+.SS "Updated Modules"
+.IX Subsection "Updated Modules"
+.IP \(bu 4
+We upgraded CGI to version 3.49 to incorporate fixes for regressions
+introduced in the release we shipped with Perl 5.12.0.
+.IP \(bu 4
+We upgraded Pod::Simple to version 3.14 to get an improvement to \eC\e<\e< \e>\e>
+parsing.
+.IP \(bu 4
+We made a small fix to the CPANPLUS test suite to fix an occasional spurious test failure.
+.IP \(bu 4
+We upgraded Safe to version 2.27 to wrap coderefs returned by \f(CWreval()\fR and \f(CWrdo()\fR.
+.SH "Changes to Existing Documentation"
+.IX Header "Changes to Existing Documentation"
+.IP \(bu 4
+We added the new maintenance release policy to perlpolicy
+.IP \(bu 4
+We've clarified the multiple-angle-bracket construct in the spec for POD
+in perlpodspec
+.IP \(bu 4
+We added a missing explanation for a warning about \f(CW\*(C`:=\*(C'\fR to perldiag
+.IP \(bu 4
+We removed a false claim in perlunitut that all text strings are Unicode strings in Perl.
+.IP \(bu 4
+We updated the GitHub mirror link in perlrepository to mirrors/perl, not github/perl
+.IP \(bu 4
+We fixed a minor error in perl5114delta.
+.IP \(bu 4
+We replaced a mention of the now-obsolete Switch with \fIgiven\fR/\fIwhen\fR.
+.IP \(bu 4
+We improved documentation about \fR\f(CI$sitelibexp\fR\fI/sitecustomize.pl\fR in perlrun.
+.IP \(bu 4
+We corrected perlmodlib which had unintentionally omitted a number of modules.
+.IP \(bu 4
+We updated the documentation for 'require' in perlfunc relating to putting Perl code in \f(CW@INC\fR.
+.IP \(bu 4
+We reinstated some erroneously-removed documentation about quotemeta in perlfunc.
+.IP \(bu 4
+We fixed an \fIa2p\fR example in perlutil.
+.IP \(bu 4
+We filled in a blank in perlport with the release date of Perl 5.12.
+.IP \(bu 4
+We fixed broken links in a number of perldelta files.
+.IP \(bu 4
+The documentation for Carp incorrectly stated that the \f(CW$Carp::Verbose\fR
+variable makes cluck generate stack backtraces.
+.IP \(bu 4
+We fixed a number of typos in Pod::Functions
+.IP \(bu 4
+We improved documentation of case-changing functions in perlfunc
+.IP \(bu 4
+We corrected perlgpl to contain the correct version of the GNU
+General Public License.
+.SH Testing
+.IX Header "Testing"
+.SS "Testing Improvements"
+.IX Subsection "Testing Improvements"
+.IP \(bu 4
+\&\fIt/op/sselect.t\fR is now less prone to clock jitter during timing checks
+on Windows.
+.Sp
+\&\fBsleep()\fR time on Win32 may be rounded down to multiple of
+the clock tick interval.
+.IP \(bu 4
+\&\fIlib/blib.t\fR and \fIlib/locale.t\fR: Fixes for test failures on Darwin/PPC
+.IP \(bu 4
+\&\fIperl5db.t\fR: Fix for test failures when \f(CW\*(C`Term::ReadLine::Gnu\*(C'\fR is installed.
+.SH "Installation and Configuration Improvements"
+.IX Header "Installation and Configuration Improvements"
+.SS "Configuration improvements"
+.IX Subsection "Configuration improvements"
+.IP \(bu 4
+We updated \fIINSTALL\fR with notes about how to deal with broken \fIdbm.h\fR
+on OpenSUSE (and possibly other platforms)
+.SH "Bug Fixes"
+.IX Header "Bug Fixes"
+.IP \(bu 4
+A bug in how we process filetest operations could cause a segfault.
+Filetests don't always expect an op on the stack, so we now use
+TOPs only if we're sure that we're not stat'ing the _ filehandle.
+This is indicated by OPf_KIDS (as checked in ck_ftst).
+.Sp
+See also: <https://github.com/Perl/perl5/issues/10335>
+.IP \(bu 4
+When deparsing a nextstate op that has both a change of package (relative
+to the previous nextstate) and a label, the package declaration is now
+emitted first, because it is syntactically impermissible for a label to
+prefix a package declaration.
+.IP \(bu 4
+XSUB.h now correctly redefines fgets under PERL_IMPLICIT_SYS
+.Sp
+See also: <http://rt.cpan.org/Public/Bug/Display.html?id=55049>
+.IP \(bu 4
+utf8::is_utf8 now respects GMAGIC (e.g. \f(CW$1\fR)
+.IP \(bu 4
+XS code using \f(CWfputc()\fR or \f(CWfputs()\fR: on Windows could cause an error
+due to their arguments being swapped.
+.Sp
+See also: <https://github.com/Perl/perl5/issues/10156>
+.IP \(bu 4
+We fixed a small bug in \fBlex_stuff_pvn()\fR that caused spurious syntax errors
+in an obscure situation. It happened when stuffing was performed on the
+last line of a file and the line ended with a statement that lacked a
+terminating semicolon.
+.Sp
+See also: <https://github.com/Perl/perl5/issues/10273>
+.IP \(bu 4
+We fixed a bug that could cause \eN{} constructs followed by a single . to
+be parsed incorrectly.
+.Sp
+See also: <https://github.com/Perl/perl5/issues/10367>
+.IP \(bu 4
+We fixed a bug that caused when(scalar) without an argument not to be
+treated as a syntax error.
+.Sp
+See also: <https://github.com/Perl/perl5/issues/10287>
+.IP \(bu 4
+We fixed a regression in the handling of labels immediately before string
+evals that was introduced in Perl 5.12.0.
+.Sp
+See also: <https://github.com/Perl/perl5/issues/10301>
+.IP \(bu 4
+We fixed a regression in case-insensitive matching of folded characters
+in regular expressions introduced in Perl 5.10.1.
+.Sp
+See also: <https://github.com/Perl/perl5/issues/10193>
+.SH "Platform Specific Notes"
+.IX Header "Platform Specific Notes"
+.SS HP-UX
+.IX Subsection "HP-UX"
+.IP \(bu 4
+Perl now allows \-Duse64bitint without promoting to use64bitall on HP-UX
+.SS AIX
+.IX Subsection "AIX"
+.IP \(bu 4
+Perl now builds on AIX 4.2
+.Sp
+The changes required work around AIX 4.2s' lack of support for IPv6,
+and limited support for POSIX \f(CWsigaction()\fR.
+.SS "FreeBSD 7"
+.IX Subsection "FreeBSD 7"
+.IP \(bu 4
+FreeBSD 7 no longer contains \fI/usr/bin/objformat\fR. At build time,
+Perl now skips the \fIobjformat\fR check for versions 7 and higher and
+assumes ELF.
+.SS VMS
+.IX Subsection "VMS"
+.IP \(bu 4
+It's now possible to build extensions on older (pre 7.3\-2) VMS systems.
+.Sp
+DCL symbol length was limited to 1K up until about seven years or
+so ago, but there was no particularly deep reason to prevent those
+older systems from configuring and building Perl.
+.IP \(bu 4
+We fixed the previously-broken \f(CW\*(C`\-Uuseperlio\*(C'\fR build on VMS.
+.Sp
+We were checking a variable that doesn't exist in the non-default
+case of disabling perlio. Now we only look at it when it exists.
+.IP \(bu 4
+We fixed the \-Uuseperlio command-line option in configure.com.
+.Sp
+Formerly it only worked if you went through all the questions
+interactively and explicitly answered no.
+.SH "Known Problems"
+.IX Header "Known Problems"
+.IP \(bu 4
+\&\f(CW\*(C`List::Util::first\*(C'\fR misbehaves in the presence of a lexical \f(CW$_\fR
+(typically introduced by \f(CW\*(C`my $_\*(C'\fR or implicitly by \f(CW\*(C`given\*(C'\fR). The variable
+which gets set for each iteration is the package variable \f(CW$_\fR, not the
+lexical \f(CW$_\fR.
+.Sp
+A similar issue may occur in other modules that provide functions which
+take a block as their first argument, like
+.Sp
+.Vb 1
+\& foo { ... $_ ...} list
+.Ve
+.Sp
+See also: <https://github.com/Perl/perl5/issues/9798>
+.IP \(bu 4
+\&\f(CW\*(C`Module::Load::Conditional\*(C'\fR and \f(CW\*(C`version\*(C'\fR have an unfortunate
+interaction which can cause \f(CW\*(C`CPANPLUS\*(C'\fR to crash when it encounters
+an unparseable version string. Upgrading to \f(CW\*(C`CPANPLUS\*(C'\fR 0.9004 or
+\&\f(CW\*(C`Module::Load::Conditional\*(C'\fR 0.38 from CPAN will resolve this issue.
+.SH Acknowledgements
+.IX Header "Acknowledgements"
+Perl 5.12.1 represents approximately four weeks of development since
+Perl 5.12.0 and contains approximately 4,000 lines of changes
+across 142 files from 28 authors.
+.PP
+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 5.12.1:
+.PP
+Ævar Arnfjörð Bjarmason, Chris Williams, chromatic, Craig A. Berry,
+David Golden, Father Chrysostomos, Florian Ragwitz, Frank Wiegand,
+Gene Sullivan, Goro Fuji, H.Merijn Brand, James E Keenan, Jan Dubois,
+Jesse Vincent, Josh ben Jore, Karl Williamson, Leon Brocard, Michael
+Schwern, Nga Tang Chan, Nicholas Clark, Niko Tyni, Philippe Bruhat,
+Rafael Garcia-Suarez, Ricardo Signes, Steffen Mueller, Todd Rinaldo,
+Vincent Pit and Zefram.
+.SH "Reporting Bugs"
+.IX Header "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://rt.perl.org/perlbug/ . There may also be
+information at http://www.perl.org/ , the Perl Home Page.
+.PP
+If you believe you have an unreported bug, please run the \fBperlbug\fR
+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 \f(CW\*(C`perl \-V\*(C'\fR, will be sent off to perlbug@perl.org to be
+analysed by the Perl porting team.
+.PP
+If the bug you are reporting has security implications, which make it
+inappropriate to send to a publicly archived mailing list, then please send
+it to perl5\-security\-report@perl.org. This points to a closed subscription
+unarchived mailing list, which includes
+all the core committers, who will be able
+to help assess the impact of issues, figure out a resolution, and help
+co-ordinate the release of patches to mitigate or fix the problem across all
+platforms on which Perl is supported. Please only use this address for
+security issues in the Perl core, not for modules independently
+distributed on CPAN.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+The \fIChanges\fR file for an explanation of how to view exhaustive details
+on what changed.
+.PP
+The \fIINSTALL\fR file for how to build Perl.
+.PP
+The \fIREADME\fR file for general stuff.
+.PP
+The \fIArtistic\fR and \fICopying\fR files for copyright information.