First, in an effort of full disclosure, let me state that I am an IBM employee but I
not, in any way whatsoever, speaking on IBM's behalf.
AIX's 4.3 binary compatibility statement can be found at:
It allows for old apps to run on the newer versions of AIX. This is to allow
customers who buy the new HW and OS or, upgrade the OS on their existing
systems, to be able to continue to run the apps they had.
There is no statement about doing the reverse, that is developing on a newer version
AIX for execution on older AIX systems.
AIX 4.3 started shipping in 1997. That has given our customers quite a bit of time to
upgrade the systems. Your 4.1.5 systems and 4.2 systems probably have been running
since early to mid 1996.
I would suggest that you upgrade your prod. systems to 4.3.3 before you switch to
your development system. That way your prod. systems can continue running even though
dev system has not been upgraded.
Glen "Tex" Chalemin
> Any idea where to go to get IBM's official line on this?
> I'm about to upgrade my development system from AIX3.2.5 to AIX4.?.
> All of our production systems are running various AIX4 versions (ranging from
> 4.1.5 to 4.2.1).
> So, specifically, I need to find out what is the latest AIX4 version I can upgrade
> my 3.2.5 development system to to generate code that will work in the field.
> IBM is apparently only selling 4.3 and beyond. I want to get a new machine for
> development, but that's not practical if I have to go around upgrading all
> production machines. That stinks.
> IBM needs to either provide development tools for some least-common-denominator
> version of the OS or stop withdrawing support for back versions of the OS.
> > YOu have just shown that IBM trys to maintain UPWARD compatibility for
> > application programs; not DOWNWARD compatibility. I think there was an append
> > here within the year showing how this 'could' be done, but since you have the
> > two machines, why not just keep compiling on the 'old' machine and transfer
> > the routines to the new?
> > > I have two AIX systems that are being used as development systems. The
> > > first one is older and is running version 4.1 with the C for AIX V4 and
> > > the newer system AIX V4.3 uses C for AIX 4.4. I can compile programs on
> > > each machine using identical source code and makefiles. The executables
> > > run on their respective machines with no problems. If I transfer the
> > > executable form the older system to the newer one, it runs fine. If I
> > > transfer the executable from the newer system ot the older, I get
> > > runtime errors:
> > > symbol __mod_init in ksh undefined
> > > symbol __crtOv in ksh undefined
> > > Error was: Exec format error
> > > Any suggestions? I do not know where to turn next. Thanks
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> > -------------
> > Norman Levin - VM/dynAmIX inc