C compatability between SCO UNIX and Altos 2000 XENIX

[Bill Irwin]

I  have  received  a  request from one of our account  managers  about  a
problem  that  one of his clients is having porting C code compiled on  a
386  running  SCO UNIX to an Altos 2000 XENIX runtime  environment.   The
scenario follows:

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Tim wishes to develop C code on the TWG 386 system running SCO UNIX and run
those binaries on the Altos 2000 Altos XENIX system. It is not working, and
it should not, because SCO UNIX C code binaries are not compatible with Altos
XENIX. I know this.

I need to know the following:

1.      Is  there a way to compile C code using the SCO UNIX Medium Model
        Compiler and Compatibility mode which will allow it to run on the
        Altos?  As stated above, I think not.

2.      Does  the  Altos  C compiler for Altos XENIX 3.2c have  a  Medium
        Model capability?

3.      If number 1 above can not work, how can the customer purchase a C
        compiler  for Altos XENIX?  Buy development?  Further, the recent
        Altos  XENIX upgrade that the client just got from us  apparently
        claims  it  now includes most of the development system as  well.
        Perhaps  we can glean from Altos whether or not that includes the
        C compiler.
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Anyone  care  to  take  a crack at any or all of these  questions?   I've
always  believed  that 386 *NIX were binary compatible.  Am I wrong?   If
not, what is the trick when compiling on UNIX?
-- 
Bill Irwin    -       The Westrheim Group     -    Vancouver, BC, Canada
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