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.\" ========================================================================
.\"
.IX Title "PERLAIX 1"
.TH PERLAIX 1 "2009-08-22" "perl v5.10.1" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
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.SH "NAME"
README.aix \- Perl version 5 on IBM Unix (AIX) systems
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
This document describes various features of \s-1IBM\s0's Unix operating
system (\s-1AIX\s0) that will affect how Perl version 5 (hereafter just Perl)
is compiled and/or runs.
.SS "Compiling Perl 5 on \s-1AIX\s0"
.IX Subsection "Compiling Perl 5 on AIX"
For information on compilers on older versions of \s-1AIX\s0, see \*(L"Compiling 
Perl 5 on older \s-1AIX\s0 versions up to 4.3.3\*(R".
.PP
When compiling Perl, you must use an \s-1ANSI\s0 C compiler. \s-1AIX\s0 does not ship
an \s-1ANSI\s0 compliant C\-compiler with \s-1AIX\s0 by default, but binary builds of
gcc for \s-1AIX\s0 are widely available.
.SS "Supported Compilers"
.IX Subsection "Supported Compilers"
Currently all versions of \s-1IBM\s0's \*(L"xlc\*(R", \*(L"xlc_r\*(R", \*(L"cc\*(R", \*(L"cc_r\*(R" or
\&\*(L"vac\*(R" \s-1ANSI/C\s0 compiler will work for building Perl if that compiler
works on your system.
.PP
If you plan to link Perl to any module that requires thread-support,
like DBD::Oracle, it is better to use the _r version of the compiler.
This will not build a threaded Perl, but a thread-enabled Perl. See
also \*(L"Threaded Perl\*(R" later on.
.PP
As of writing (2009\-08) only the \s-1IBM\s0 \s-1XL\s0 C for \s-1AIX\s0 or \s-1XL\s0 C/\*(C+ for \s-1AIX\s0
compiler is supported by \s-1IBM\s0 on \s-1AIX\s0 5L/6.1.
.PP
The following compiler versions are supported by \s-1IBM:\s0
.PP
\&\s-1XL\s0 C and \s-1XL\s0 C/\*(C+ V7, V8, V9, V10
.PP
The \s-1XL\s0 C for \s-1AIX\s0 is integrated in the \s-1XL\s0 C/\*(C+ for \s-1AIX\s0 compiler.
.PP
If you choose \s-1XL\s0 C/\*(C+ V9 you need \s-1APAR\s0 \s-1IZ35785\s0 installed
otherwise the integrated SDBM_File do not compile correctly due
to an optimization bug. You can circumvent this problem by
adding \-qipa to the optimization flags (\-Doptimize='\-O \-qipa').
The \s-1PTF\s0 for \s-1APAR\s0 \s-1IZ35785\s0 which solves this problem is available
from \s-1IBM\s0 (April 2009 \s-1PTF\s0 for \s-1XL\s0 C/\*(C+ Enterprise Edition for \s-1AIX\s0, V9.0).
.PP
Perl can be compiled with either \s-1IBM\s0's \s-1ANSI\s0 C compiler or with gcc.
The former is recommended, as not only it can compile Perl with no
difficulty, but also can take advantage of features listed later
that require the use of \s-1IBM\s0 compiler-specific command-line flags.
.PP
If you decide to use gcc, make sure your installation is recent and
complete, and be sure to read the Perl \s-1INSTALL\s0 file for more gcc-specific
details. Please report any hoops you had to jump through to the
development team.
.SS "Incompatibility with \s-1AIX\s0 Toolbox lib gdbm"
.IX Subsection "Incompatibility with AIX Toolbox lib gdbm"
If the \s-1AIX\s0 Toolbox version of lib gdbm 1.8.x is installed on the
system then Perl will not work. This library contains a defect version
of the \fIdbm_store()\fR function. The lib gdbm will be automatically removed
from the wanted libraries.
.SS "Perl 5.10 was successfully compiled and tested on:"
.IX Subsection "Perl 5.10 was successfully compiled and tested on:"
.Vb 10
\&    AIX Level                 | Compiler Level          | w th | w/o th
\&    \-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-\-+\-\-\-\-\-\-+\-\-\-\-\-\-\-
\&    5.1 TL9 32 bit            | XL C/C++ V7             | OK   | OK
\&    5.1 TL9 32 bit            | gcc 3.2.2               | OK   | OK
\&    5.1 TL9 64 bit            | XL C/C++ V7             | OK   | OK
\&    5.2 TL10 32 bit           | XL C/C++ V8             | OK   | OK
\&    5.2 TL8 64 bit            | VA C/C++ V6             | OK   | OK
\&    5.2 TL10 64 bit           | XL C/C++ V8             | OK   | OK
\&    5.3 TL7 32 bit            | XL C/C++ V9 + IZ35785   | OK   | OK
\&    5.3 TL7 32 bit            | gcc 4.2.4               | OK   | OK
\&    5.3 TL7 64 bit            | XL C/C++ V9 + IZ35785   | OK   | OK
\&    6.1 TL1 32 bit            | XL C/C++ V10            | OK   | OK
\&    6.1 TL1 64 bit + IZ39077  | XL C/C++ V10            | OK   | OK
\&
\&    w th   = with thread
\&    w/o th = without thread
\&    OK     = tested
.Ve
.PP
Successfully tested means that all \*(L"make test\*(R" runs finish with an 
result of 100% \s-1OK\s0. All tests were conducted with \-Duseshrplib set.
.SS "Building Dynamic Extensions on \s-1AIX\s0"
.IX Subsection "Building Dynamic Extensions on AIX"
Starting from Perl 5.7.2 (and consequently 5.8.x / 5.10.x) and \s-1AIX\s0 4.3 
or newer Perl uses the \s-1AIX\s0 native dynamic loading interface in the so 
called runtime linking mode instead of the emulated interface that was 
used in Perl releases 5.6.1 and earlier or, for \s-1AIX\s0 releases 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 \s-1AIX\s0 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.
.PP
It is highly recommended to use the new interface.
.SS "Using Large Files with Perl"
.IX Subsection "Using Large Files with Perl"
Should yield no problems.
.SS "Threaded Perl"
.IX Subsection "Threaded Perl"
Should yield no problems with \s-1AIX\s0 5.1 / 5.2 / 5.3 and 6.1.
.PP
\&\s-1IBM\s0 uses the \s-1AIX\s0 system Perl (V5.6.0 on \s-1AIX\s0 5.1 and V5.8.2 on
\&\s-1AIX\s0 5.2 / 5.3 and 6.1) for some \s-1AIX\s0
system scripts. If you switch the links in /usr/bin from the
\&\s-1AIX\s0 system Perl (/usr/opt/perl5) to the newly build Perl then you
get the same features as with the \s-1IBM\s0 \s-1AIX\s0 system Perl if the
threaded options are used.
.PP
The threaded Perl build works also on \s-1AIX\s0 5.1 but the \s-1IBM\s0 Perl
build (Perl v5.6.0) is not threaded on \s-1AIX\s0 5.1.
.SS "64\-bit Perl"
.IX Subsection "64-bit Perl"
If your \s-1AIX\s0 system is installed with 64\-bit support, you can expect 64\-bit
configurations to work. If you want to use 64\-bit Perl on \s-1AIX\s0 6.1
you need a \s-1APAR\s0 for a libc.a bug which affects (n)dbm_XXX functions.
The \s-1APAR\s0 number for this problem is \s-1IZ39077\s0.
.PP
If you need more memory (larger data segment) for your Perl programs you
can set:
.PP
.Vb 3
\&    /etc/security/limits
\&    default:                    (or your user)
\&        data = \-1               (default is 262144 * 512 byte)
.Ve
.PP
With the default setting the size is limited to 128MB.
The \-1 removes this limit. If the \*(L"make test\*(R" fails please change 
your /etc/security/limits as stated above.
.SS "Recommended Options \s-1AIX\s0 5.1/5.2/5.3 and 6.1 (threaded/32\-bit)"
.IX Subsection "Recommended Options AIX 5.1/5.2/5.3 and 6.1 (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 \s-1AIX\s0 ships with.
.PP
.Vb 7
\&    rm config.sh
\&    ./Configure \e
\&    \-d \e
\&    \-Dcc=cc_r \e
\&    \-Duseshrplib \e
\&    \-Dusethreads \e
\&    \-Dprefix=/usr/opt/perl5_32
.Ve
.PP
The \-Dprefix option will install Perl in a directory parallel to the 
\&\s-1IBM\s0 \s-1AIX\s0 system Perl installation.
.SS "Recommended Options \s-1AIX\s0 5.1/5.2/5.3 and 6.1 (32\-bit)"
.IX Subsection "Recommended Options AIX 5.1/5.2/5.3 and 6.1 (32-bit)"
With the following options you get a Perl version which passes 
all make tests in 32\-bit mode.
.PP
.Vb 6
\&    rm config.sh
\&    ./Configure \e
\&    \-d \e
\&    \-Dcc=cc_r \e
\&    \-Duseshrplib \e
\&    \-Dprefix=/usr/opt/perl5_32
.Ve
.PP
The \-Dprefix option will install Perl in a directory parallel to the
\&\s-1IBM\s0 \s-1AIX\s0 system Perl installation.
.SS "Recommended Options \s-1AIX\s0 5.1/5.2/5.3 and 6.1 (threaded/64\-bit)"
.IX Subsection "Recommended Options AIX 5.1/5.2/5.3 and 6.1 (threaded/64-bit)"
With the following options you get a threaded Perl version which
passes all make tests in 64\-bit mode.
.PP
.Vb 1
\&    export OBJECT_MODE=64 / setenv OBJECT_MODE 64 (depending on your shell)
\&
\&    rm config.sh
\&    ./Configure \e
\&    \-d \e
\&    \-Dcc=cc_r \e
\&    \-Duseshrplib \e
\&    \-Dusethreads \e
\&    \-Duse64bitall \e
\&    \-Dprefix=/usr/opt/perl5_64
.Ve
.SS "Recommended Options \s-1AIX\s0 5.1/5.2/5.3 and 6.1(64\-bit)"
.IX Subsection "Recommended Options AIX 5.1/5.2/5.3 and 6.1(64-bit)"
With the following options you get a Perl version which passes all 
make tests in 64\-bit mode.
.PP
.Vb 1
\&    export OBJECT_MODE=64 / setenv OBJECT_MODE 64 (depending on your shell)
\&
\&    rm config.sh
\&    ./Configure \e
\&    \-d \e
\&    \-Dcc=cc_r \e
\&    \-Duseshrplib \e
\&    \-Duse64bitall \e
\&    \-Dprefix=/usr/opt/perl5_64
.Ve
.PP
The \-Dprefix option will install Perl in a directory parallel to the 
\&\s-1IBM\s0 \s-1AIX\s0 system Perl installation.
.PP
If you choose gcc to compile 64\-bit Perl then you need to add the 
following option:
.PP
.Vb 1
\&    \-Dcc=\*(Aqgcc \-maix64\*(Aq
.Ve
.SS "Compiling Perl 5 on older \s-1AIX\s0 versions up to 4.3.3"
.IX Subsection "Compiling Perl 5 on older AIX versions up to 4.3.3"
Due to the fact that \s-1AIX\s0 4.3.3 reached end-of-service in December 31, 
2003 this information  is provided as is. The Perl versions prior to 
Perl 5.8.9 could be compiled on \s-1AIX\s0 up to 4.3.3 with the following 
settings (your mileage may vary):
.PP
When compiling Perl, you must use an \s-1ANSI\s0 C compiler. \s-1AIX\s0 does not ship
an \s-1ANSI\s0 compliant C\-compiler with \s-1AIX\s0 by default, but binary builds of
gcc for \s-1AIX\s0 are widely available.
.PP
At the moment of writing, \s-1AIX\s0 supports two different native C compilers,
for which you have to pay: \fBxlC\fR and \fBvac\fR. If you decide to use either
of these two (which is quite a lot easier than using gcc), be sure to
upgrade to the latest available patch level. Currently:
.PP
.Vb 2
\&    xlC.C     3.1.4.10 or 3.6.6.0 or 4.0.2.2 or 5.0.2.9 or 6.0.0.3
\&    vac.C     4.4.0.3  or 5.0.2.6 or 6.0.0.1
.Ve
.PP
note that xlC has the \s-1OS\s0 version in the name as of version 4.0.2.0, so
you will find xlC.C for \s-1AIX\-5\s0.0 as package
.PP
.Vb 1
\&    xlC.aix50.rte   5.0.2.0 or 6.0.0.3
.Ve
.PP
subversions are not the same \*(L"latest\*(R" on all \s-1OS\s0 versions. For example,
the latest xlC\-5 on aix41 is 5.0.2.9, while on aix43, it is 5.0.2.7.
.PP
Perl can be compiled with either \s-1IBM\s0's \s-1ANSI\s0 C compiler or with gcc.
The former is recommended, as not only can it compile Perl with no
difficulty, but also can take advantage of features listed later that
require the use of \s-1IBM\s0 compiler-specific command-line flags.
.PP
The \s-1IBM\s0's compiler patch levels 5.0.0.0 and 5.0.1.0 have compiler
optimization bugs that affect compiling perl.c and regcomp.c,
respectively.  If Perl's configuration detects those compiler patch
levels, optimization is turned off for the said source code files.
Upgrading to at least 5.0.2.0 is recommended.
.PP
If you decide to use gcc, make sure your installation is recent and
complete, and be sure to read the Perl \s-1INSTALL\s0 file for more gcc-specific
details. Please report any hoops you had to jump through to the development
team.
.SS "\s-1OS\s0 level"
.IX Subsection "OS level"
Before installing the patches to the \s-1IBM\s0 C\-compiler you need to know the
level of patching for the Operating System. \s-1IBM\s0's command 'oslevel' will
show the base, but is not always complete (in this example oslevel shows
4.3.NULL, whereas the system might run most of 4.3.THREE):
.PP
.Vb 6
\&    # oslevel
\&    4.3.0.0
\&    # lslpp \-l | grep \*(Aqbos.rte \*(Aq
\&    bos.rte           4.3.3.75  COMMITTED  Base Operating System Runtime
\&    bos.rte            4.3.2.0  COMMITTED  Base Operating System Runtime
\&    #
.Ve
.PP
The same might happen to \s-1AIX\s0 5.1 or other \s-1OS\s0 levels. As a side note, Perl
cannot be built without bos.adt.syscalls and bos.adt.libm installed
.PP
.Vb 4
\&    # lslpp \-l | egrep "syscalls|libm"
\&    bos.adt.libm      5.1.0.25  COMMITTED  Base Application Development
\&    bos.adt.syscalls  5.1.0.36  COMMITTED  System Calls Application
\&    #
.Ve
.SS "Building Dynamic Extensions on \s-1AIX\s0"
.IX Subsection "Building Dynamic Extensions on AIX"
\&\s-1AIX\s0 supports dynamically loadable objects as well as shared libraries.
Shared libraries by convention end with the suffix .a, which is a bit
misleading, as an archive can contain static as well as dynamic members.
For Perl dynamically loaded objects we use the .so suffix also used on
many other platforms.
.PP
Note that starting from Perl 5.7.2 (and consequently 5.8.0) and \s-1AIX\s0 4.3
or newer Perl uses the \s-1AIX\s0 native dynamic loading interface in the so
called runtime linking mode instead of the emulated interface that was
used in Perl releases 5.6.1 and earlier or, for \s-1AIX\s0 releases 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 \s-1AIX\s0 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.
.SS "The \s-1IBM\s0 \s-1ANSI\s0 C Compiler"
.IX Subsection "The IBM ANSI C Compiler"
All defaults for Configure can be used.
.PP
If you've chosen to use vac 4, be sure to run 4.4.0.3. Older versions
will turn up nasty later on. For vac 5 be sure to run at least 5.0.1.0,
but vac 5.0.2.6 or up is highly recommended. Note that since \s-1IBM\s0 has
removed vac 5.0.2.1 through 5.0.2.5 from the software depot, these
versions should be considered obsolete.
.PP
Here's a brief lead of how to upgrade the compiler to the latest
level.  Of course this is subject to changes.  You can only upgrade
versions from ftp-available updates if the first three digit groups
are the same (in where you can skip intermediate unlike the patches
in the developer snapshots of Perl), or to one version up where the
\&\*(L"base\*(R" is available.  In other words, the \s-1AIX\s0 compiler patches are
cumulative.
.PP
.Vb 2
\& vac.C.4.4.0.1 => vac.C.4.4.0.3  is OK     (vac.C.4.4.0.2 not needed)
\& xlC.C.3.1.3.3 => xlC.C.3.1.4.10 is NOT OK (xlC.C.3.1.4.0 is not available)
\&
\& # ftp ftp.software.ibm.com
\& Connected to service.boulder.ibm.com.
\& : welcome message ...
\& Name (ftp.software.ibm.com:merijn): anonymous
\& 331 Guest login ok, send your complete e\-mail address as password.
\& Password:
\& ... accepted login stuff
\& ftp> cd /aix/fixes/v4/
\& ftp> dir other other.ll
\& output to local\-file: other.ll? y
\& 200 PORT command successful.
\& 150 Opening ASCII mode data connection for /bin/ls.
\& 226 Transfer complete.
\& ftp> dir xlc xlc.ll
\& output to local\-file: xlc.ll? y
\& 200 PORT command successful.
\& 150 Opening ASCII mode data connection for /bin/ls.
\& 226 Transfer complete.
\& ftp> bye
\& ... goodbye messages
\& # ls \-l *.ll
\& \-rw\-rw\-rw\-   1 merijn   system    1169432 Nov  2 17:29 other.ll
\& \-rw\-rw\-rw\-   1 merijn   system      29170 Nov  2 17:29 xlc.ll
.Ve
.PP
On \s-1AIX\s0 4.2 using xlC, we continue:
.PP
.Vb 10
\& # lslpp \-l | fgrep \*(AqxlC.C \*(Aq
\&   xlC.C                     3.1.4.9  COMMITTED  C for AIX Compiler
\&   xlC.C                     3.1.4.0  COMMITTED  C for AIX Compiler
\& # grep \*(AqxlC.C.3.1.4.*.bff\*(Aq xlc.ll
\& \-rw\-r\-\-r\-\-   1 45776101 1        6286336 Jul 22 1996  xlC.C.3.1.4.1.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        6173696 Aug 24 1998  xlC.C.3.1.4.10.bff
\& \-rw\-r\-\-r\-\-   1 45776101 1        6319104 Aug 14 1996  xlC.C.3.1.4.2.bff
\& \-rw\-r\-\-r\-\-   1 45776101 1        6316032 Oct 21 1996  xlC.C.3.1.4.3.bff
\& \-rw\-r\-\-r\-\-   1 45776101 1        6315008 Dec 20 1996  xlC.C.3.1.4.4.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        6178816 Mar 28 1997  xlC.C.3.1.4.5.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        6188032 May 22 1997  xlC.C.3.1.4.6.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        6191104 Sep  5 1997  xlC.C.3.1.4.7.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        6185984 Jan 13 1998  xlC.C.3.1.4.8.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        6169600 May 27 1998  xlC.C.3.1.4.9.bff
\& # wget ftp://ftp.software.ibm.com/aix/fixes/v4/xlc/xlC.C.3.1.4.10.bff
\& #
.Ve
.PP
On \s-1AIX\s0 4.3 using vac, we continue:
.PP
.Vb 10
\& # lslpp \-l | grep \*(Aqvac.C \*(Aq
\&  vac.C                      5.0.2.2  COMMITTED  C for AIX Compiler
\&  vac.C                      5.0.2.0  COMMITTED  C for AIX Compiler
\& # grep \*(Aqvac.C.5.0.2.*.bff\*(Aq other.ll
\& \-rw\-rw\-r\-\-   1 45776101 1        13592576 Apr 16 2001  vac.C.5.0.2.0.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        14133248 Apr  9 2002  vac.C.5.0.2.3.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        14173184 May 20 2002  vac.C.5.0.2.4.bff
\& \-rw\-rw\-r\-\-   1 45776101 1        14192640 Nov 22 2002  vac.C.5.0.2.6.bff
\& # wget ftp://ftp.software.ibm.com/aix/fixes/v4/other/vac.C.5.0.2.6.bff
\& #
.Ve
.PP
Likewise on all other \s-1OS\s0 levels. Then execute the following command, and
fill in its choices
.PP
.Vb 5
\& # smit install_update
\&  \-> Install and Update from LATEST Available Software
\&  * INPUT device / directory for software [ vac.C.5.0.2.6.bff    ]
\&  [ OK ]
\&  [ OK ]
.Ve
.PP
Follow the messages ... and you're done.
.PP
If you like a more web-like approach, a good start point can be
http://www14.software.ibm.com/webapp/download/downloadaz.jsp and click
\&\*(L"C for \s-1AIX\s0\*(R", and follow the instructions.
.SS "The usenm option"
.IX Subsection "The usenm option"
If linking miniperl
.PP
.Vb 1
\& cc \-o miniperl ... miniperlmain.o opmini.o perl.o ... \-lm \-lc ...
.Ve
.PP
causes error like this
.PP
.Vb 8
\& ld: 0711\-317 ERROR: Undefined symbol: .aintl
\& ld: 0711\-317 ERROR: Undefined symbol: .copysignl
\& ld: 0711\-317 ERROR: Undefined symbol: .syscall
\& ld: 0711\-317 ERROR: Undefined symbol: .eaccess
\& ld: 0711\-317 ERROR: Undefined symbol: .setresuid
\& ld: 0711\-317 ERROR: Undefined symbol: .setresgid
\& ld: 0711\-317 ERROR: Undefined symbol: .setproctitle
\& ld: 0711\-345 Use the \-bloadmap or \-bnoquiet option to obtain more information.
.Ve
.PP
you could retry with
.PP
.Vb 3
\& make realclean
\& rm config.sh
\& ./Configure \-Dusenm ...
.Ve
.PP
which makes Configure to use the \f(CW\*(C`nm\*(C'\fR tool when scanning for library
symbols, which usually is not done in \s-1AIX\s0.
.PP
Related to this, you probably should not use the \f(CW\*(C`\-r\*(C'\fR option of
Configure in \s-1AIX\s0, because that affects of how the \f(CW\*(C`nm\*(C'\fR tool is used.
.SS "Using \s-1GNU\s0's gcc for building Perl"
.IX Subsection "Using GNU's gcc for building Perl"
Using gcc\-3.x (tested with 3.0.4, 3.1, and 3.2) now works out of the box,
as do recent gcc\-2.9 builds available directly from \s-1IBM\s0 as part of their
Linux compatibility packages, available here:
.PP
.Vb 1
\&  http://www.ibm.com/servers/aix/products/aixos/linux/
.Ve
.SS "Using Large Files with Perl"
.IX Subsection "Using Large Files with Perl"
Should yield no problems.
.SS "Threaded Perl"
.IX Subsection "Threaded Perl"
Threads seem to work \s-1OK\s0, though at the moment not all tests pass when
threads are used in combination with 64\-bit configurations.
.PP
You may get a warning when doing a threaded build:
.PP
.Vb 1
\&  "pp_sys.c", line 4640.39: 1506\-280 (W) Function argument assignment between types "unsigned char*" and "const void*" is not allowed.
.Ve
.PP
The exact line number may vary, but if the warning (W) comes from a line
line this
.PP
.Vb 1
\&  hent = PerlSock_gethostbyaddr(addr, (Netdb_hlen_t) addrlen, addrtype);
.Ve
.PP
in the \*(L"pp_ghostent\*(R" function, you may ignore it safely.  The warning
is caused by the reentrant variant of \fIgethostbyaddr()\fR having a slightly
different prototype than its non-reentrant variant, but the difference
is not really significant here.
.SS "64\-bit Perl"
.IX Subsection "64-bit Perl"
If your \s-1AIX\s0 is installed with 64\-bit support, you can expect 64\-bit
configurations to work. In combination with threads some tests might
still fail.
.SS "\s-1AIX\s0 4.2 and extensions using \*(C+ with statics"
.IX Subsection "AIX 4.2 and extensions using  with statics"
In \s-1AIX\s0 4.2 Perl extensions that use \*(C+ functions that use statics
may have problems in that the statics are not getting initialized.
In newer \s-1AIX\s0 releases this has been solved by linking Perl with
the libC_r library, but unfortunately in \s-1AIX\s0 4.2 the said library
has an obscure bug where the various functions related to time
(such as \fItime()\fR and \fIgettimeofday()\fR) return broken values, and
therefore in \s-1AIX\s0 4.2 Perl is not linked against the libC_r.
.SH "AUTHORS"
.IX Header "AUTHORS"
H.Merijn Brand <h.m.brand@xs4all.nl>
Rainer Tammer <tammer@tammer.net>
.SH "DATE"
.IX Header "DATE"
Version 0.0.10: 07 Aug 2009
