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PERLAIX(1)	       Perl Programmers Reference Guide 	    PERLAIX(1)

       README.aix - Perl version 5 on IBM Unix (AIX) systems

       This document describes various features of IBMs Unix operating system
       (AIX) that will affect how Perl version 5 (hereafter just Perl) is com
       piled and/or runs.

       Compiling Perl 5 on AIX

       When compiling Perl, you must use an ANSI C compiler. AIX does not ship
       an ANSI compliant C-compiler with AIX by default, but binary builds of
       gcc for AIX are widely available.

       At the moment of writing, AIX supports two different native C compil
       ers, for which you have to pay: xlC and vac. 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:

	   xlC.C or or or or
	   vac.C  or or

       note that xlC has the OS version in the name as of version, so
       you will find xlC.C for AIX-5.0 as package

	   xlC.aix50.rte or

       subversions are not the same "latest" on all OS versions. For example,
       the latest xlC-5 on aix41 is, while on aix43, it is

       Perl can be compiled with either IBMs ANSI C compiler or with gcc.
       The former is recommended, as not only can it compile Perl with no dif
       ficulty, but also can take advantage of features listed later that
       require the use of IBM compiler-specific command-line flags.

       The IBMs compiler patch levels and have compiler opti
       mization bugs that affect compiling perl.c and regcomp.c, respectively.
       If Perls configuration detects those compiler patch levels, optimiza
       tion is turned off for the said source code files.  Upgrading to at
       least is recommended.

       If you decide to use gcc, make sure your installation is recent and
       complete, and be sure to read the Perl README file for more gcc-spe
       cific details. Please report any hoops you had to jump through to the
       development team.

       OS level

       Before installing the patches to the IBM C-compiler you need to know
       the level of patching for the Operating System. IBMs 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):

	   # oslevel
	   # lslpp -l | grep bos.rte
	   bos.rte  COMMITTED  Base Operating System Runtime
	   bos.rte  COMMITTED  Base Operating System Runtime

       The same might happen to AIX 5.1 or other OS levels. As a side note,
       perl cannot be built without bos.adt.syscalls and bos.adt.libm

	   # lslpp -l | egrep "syscalls|libm"
	   bos.adt.libm  COMMITTED  Base Application Development
	   bos.adt.syscalls  COMMITTED  System Calls Application

       Building Dynamic Extensions on AIX

       AIX 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 mem
       bers.  For perl dynamically loaded objects we use the .so suffix also
       used on many other platforms.

       Note that starting from Perl 5.7.2 (and consequently 5.8.0) and AIX 4.3
       or newer Perl uses the AIX 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 AIX 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 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.

       The IBM ANSI C Compiler

       All defaults for Configure can be used.

       If youve chosen to use vac 4, be sure to run Older versions
       will turn up nasty later on. For vac 5 be sure to run at least,
       but vac or up is highly recommended. Note that since IBM has
       removed vac through from the software depot, these ver
       sions should be considered obsolete.

       Heres 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 "base" is available.
       In other words, the AIX compiler patches are cumulative.

	vac.C. => vac.C.	is OK	  (vac.C. not needed)
	xlC.C. => xlC.C. is NOT OK (xlC.C. 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.
	... 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

       On AIX 4.2 using xlC, we continue:

	# lslpp -l | fgrep xlC.C
	  xlC.C  COMMITTED	C for AIX Compiler
	  xlC.C  COMMITTED	C for AIX Compiler
	# grep xlC.C.3.1.4.*.bff xlc.ll
	-rw-r--r--   1 45776101 1	 6286336 Jul 22 1996  xlC.C.
	-rw-rw-r--   1 45776101 1	 6173696 Aug 24 1998  xlC.C.
	-rw-r--r--   1 45776101 1	 6319104 Aug 14 1996  xlC.C.
	-rw-r--r--   1 45776101 1	 6316032 Oct 21 1996  xlC.C.
	-rw-r--r--   1 45776101 1	 6315008 Dec 20 1996  xlC.C.
	-rw-rw-r--   1 45776101 1	 6178816 Mar 28 1997  xlC.C.
	-rw-rw-r--   1 45776101 1	 6188032 May 22 1997  xlC.C.
	-rw-rw-r--   1 45776101 1	 6191104 Sep  5 1997  xlC.C.
	-rw-rw-r--   1 45776101 1	 6185984 Jan 13 1998  xlC.C.
	-rw-rw-r--   1 45776101 1	 6169600 May 27 1998  xlC.C.
	# wget ftp://ftp.software.ibm.com/aix/fixes/v4/xlc/xlC.C.

       On AIX 4.3 using vac, we continue:

	# lslpp -l | grep vac.C
	 vac.C  COMMITTED	C for AIX Compiler
	 vac.C  COMMITTED	C for AIX Compiler
	# grep vac.C.5.0.2.*.bff other.ll
	-rw-rw-r--   1 45776101 1	 13592576 Apr 16 2001  vac.C.
	-rw-rw-r--   1 45776101 1	 14133248 Apr  9 2002  vac.C.
	-rw-rw-r--   1 45776101 1	 14173184 May 20 2002  vac.C.
	-rw-rw-r--   1 45776101 1	 14192640 Nov 22 2002  vac.C.
	# wget ftp://ftp.software.ibm.com/aix/fixes/v4/other/vac.C.

       Likewise on all other OS levels. Then execute the following command,
       and fill in its choices

	# smit install_update
	 -> Install and Update from LATEST Available Software
	 * INPUT device / directory for software [ vac.C.	]
	 [ OK ]
	 [ OK ]

       Follow the messages ... and youre done.

       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
       "C for AIX", and follow the instructions.

       The usenm option

       If linking miniperl

	cc -o miniperl ... miniperlmain.o opmini.o perl.o ... -lm -lc ...

       causes error like this

	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.

       you could retry with

	make realclean
	rm config.sh
	./Configure -Dusenm ...

       which makes Configure to use the "nm" tool when scanning for library
       symbols, which usually is not done in AIX.

       Related to this, you probably should not use the "-r" option of Config
       ure in AIX, because that affects of how the "nm" tool is used.

       Using GNUs 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 IBM as part of
       their Linux compatibility packages, available here:


       Using Large Files with Perl

       Should yield no problems.

       Threaded Perl

       Threads seem to work OK, though at the moment not all tests pass when
       threads are used in combination with 64-bit configurations.

       You may get a warning when doing a threaded build:

	 "pp_sys.c", line 4640.39: 1506-280 (W) Function argument assignment between types "unsigned char*" and "const void*" is not allowed.

       The exact line number may vary, but if the warning (W) comes from a
       line line this

	 hent = PerlSock_gethostbyaddr(addr, (Netdb_hlen_t) addrlen, addrtype);

       in the "pp_ghostent" function, you may ignore it safely.  The warning
       is caused by the reentrant variant of gethostbyaddr() having a slightly
       different prototype than its non-reentrant variant, but the difference
       is not really significant here.

       64-bit Perl

       If your AIX is installed with 64-bit support, you can expect 64-bit
       configurations to work. In combination with threads some tests might
       still fail.

       AIX 4.2 and extensions using C++ with statics

       In AIX 4.2 Perl extensions that use C++ functions that use statics may
       have problems in that the statics are not getting initialized.  In
       newer AIX releases this has been solved by linking Perl with the libC_r
       library, but unfortunately in AIX 4.2 the said library has an obscure
       bug where the various functions related to time (such as time() and
       gettimeofday()) return broken values, and therefore in AIX 4.2 Perl is
       not linked against the libC_r.

       H.Merijn Brand 

       Version 0.0.6: 23 Dec 2002

perl v5.8.8			  2008-04-25			    PERLAIX(1)

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