README for AIX Perl 5.28.1 distribution 
======================================

This README is for explaining the packaging and distribution of Perl 5.28.1
on AIX 7.1.0.0.  Perl 5.10.1 (first released) with AIX 710 in 2010.

This version of Perl is distributed under the Artistic License.  This
license can be found in /usr/opt/perl5/Artistic.

Standard Version of the perl source code can be obtained from
www.cpan.org (http://www.cpan.org/src)

The 64-bit and 32-bit versions are packaged together with
the 32-bit version being the default version(/usr/bin/perl).

This version of Perl also supports loading of large files.
The 64-bit version was built using both maximal 64-bit support along with
64-bit integer support.

Both versions reside under /usr/opt/perl5 directory.

Both versions are perl thread capable, built using the newer ithreads
(interpreter threads) and also have builtin support for PerlIO.

Also of interest is the libperl.a library located in the following places
under /usr/opt/perl5:

        ./lib/5.10.1/aix-thread-multi/CORE/libperl.a
        ./lib64/5.10.1/aix-thread-multi-64all/CORE/libperl.a

Applications which depends on 64-bit version of perl must use /usr/bin/perl64
and 32-bit applications must use /usr/bin/perl32 or
/usr/bin/perl as it has always been.If an application has always used /usr/bin/perl
as 32-bit, it would continue to work as it always has.

If changes have been made to defualt perl links which are installed by the package
then one can run /usr/opt/perl5/link_perl_32 script to retain the original links.

NOTE: You must run the scripts as root for it to work.

Following recent changes have been added to perl-5.10.1.
========================================================

Security Changes:
[CVE-2018-18311] Integer overflow leading to buffer overflow and segmentation fault.
[CVE-2018-18312] Heap-buffer-overflow write in S_regatom (regcomp.c)

Incompatible Changes:
There are no changes intentionally incompatible with 5.28.0.

Selected Bug Fixes
	Perl 5.28 introduced an index() optimization when comparing to -1 (or indirectly, e.g. >= 0). When this optimization was triggered inside a when clause it caused a warning ("Argument %s isn't numeric in smart match"). This has now been fixed. [perl #133368]
	Matching of decimal digits in script runs, introduced in Perl 5.28, had a bug that led to "1\N{THAI DIGIT FIVE}" matching /^(*sr:\d+)$/ when it should not. This has now been fixed.
	The new in-place editing code no longer leaks directory handles. [perl #133314]

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