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4.2 and earlier. This change does break backward compatibility with
compiled modules from earlier Perl releases. The change was made to make
Perl more compliant with other applications like Apache/mod_perl which are
using the AIX native interface. This change also enables the use of
C++ code with static constructors and destructors in Perl extensions,
which was not possible using the emulated interface.

It is highly recommended to use the new interface.

=head2 Using Large Files with Perl

Should yield no problems.

=head2 Threaded Perl

Should yield no problems with AIX 5.1 / 5.2 / 5.3 / 6.1 / 7.1.

IBM uses the AIX system Perl (V5.6.0 on AIX 5.1 and V5.8.2 on
AIX 5.2 / 5.3 and 6.1; V5.8.8 on AIX 5.3 TL11 and AIX 6.1 TL4; V5.10.1
on AIX 7.1) for some AIX system scripts. If you switch the links in
/usr/bin from the AIX system Perl (/usr/opt/perl5) to the newly build
Perl then you get the same features as with the IBM AIX system Perl if
the threaded options are used.

The threaded Perl build works also on AIX 5.1 but the IBM Perl
build (Perl v5.6.0) is not threaded on AIX 5.1.

Perl 5.12 an newer is not compatible with the IBM fileset perl.libext.

=head2 64-bit Perl

If your AIX system is installed with 64-bit support, you can expect 64-bit
configurations to work. If you want to use 64-bit Perl on AIX 6.1
you need an APAR for a libc.a bug which affects (n)dbm_XXX functions.
The APAR number for this problem is IZ39077.

If you need more memory (larger data segment) for your Perl programs you
can set:

    /etc/security/limits
    default:                    (or your user)
        data = -1               (default is 262144 * 512 byte)

With the default setting the size is limited to 128MB.
The -1 removes this limit. If the "make test" fails please change
your /etc/security/limits as stated above.

=head2 Long doubles

IBM calls its implementation of long doubles 128-bit, but it is not
the IEEE 128-bit ("quadruple precision") which would give 116 bit of
mantissa (nor it is implemented in hardware), instead it's a special
software implementation called "double-double", which gives 106 bits
of mantissa.

There seem to be various problems in this long double implementation.
If Configure detects this brokenness, it will disable the long double support.
This can be overridden with explicit C<-Duselongdouble> (or C<-Dusemorebits>,
which enables both long doubles and 64 bit integers).  If you decide to
enable long doubles, for most of the broken things Perl has implemented
workarounds, but the handling of the special values infinity and NaN
remains badly broken: for example infinity plus zero results in NaN.

=head2 Recommended Options AIX 5.1/5.2/5.3/6.1 and 7.1 (threaded/32-bit)

With the following options you get a threaded Perl version which
passes all make tests in threaded 32-bit mode, which is the default
configuration for the Perl builds that AIX ships with.

    rm config.sh
    ./Configure \
    -d \
    -Dcc=cc_r \
    -Duseshrplib \
    -Dusethreads \
    -Dprefix=/usr/opt/perl5_32

The -Dprefix option will install Perl in a directory parallel to the 
IBM AIX system Perl installation.

=head2 Recommended Options AIX 5.1/5.2/5.3/6.1 and 7.1 (32-bit)

With the following options you get a Perl version which passes 
all make tests in 32-bit mode.

    rm config.sh
    ./Configure \
    -d \
    -Dcc=cc_r \
    -Duseshrplib \
    -Dprefix=/usr/opt/perl5_32

The -Dprefix option will install Perl in a directory parallel to the
IBM AIX system Perl installation.

=head2 Recommended Options AIX 5.1/5.2/5.3/6.1 and 7.1 (threaded/64-bit)

With the following options you get a threaded Perl version which
passes all make tests in 64-bit mode.

 export OBJECT_MODE=64 / setenv OBJECT_MODE 64 (depending on your shell)

 rm config.sh
 ./Configure \
 -d \
 -Dcc=cc_r \
 -Duseshrplib \
 -Dusethreads \
 -Duse64bitall \
 -Dprefix=/usr/opt/perl5_64

=head2 Recommended Options AIX 5.1/5.2/5.3/6.1 and 7.1 (64-bit)

With the following options you get a Perl version which passes all
make tests in 64-bit mode. 

 export OBJECT_MODE=64 / setenv OBJECT_MODE 64 (depending on your shell)

 rm config.sh
 ./Configure \
 -d \
 -Dcc=cc_r \