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From: jcm@ORNL-MSR.arpa (James A. Mullens)
Newsgroups: net.micro
Subject: Re:  Info needed on Microsoft C Version 3.0
Message-ID: <1589@brl-smoke.ARPA>
Date: Mon, 23-Jun-86 12:00:07 EDT
Article-I.D.: brl-smok.1589
Posted: Mon Jun 23 12:00:07 1986
Date-Received: Sat, 28-Jun-86 07:43:19 EDT
Sender: news@brl-smoke.ARPA
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Microsoft C expects that a "_" is prepended to an external name, so that
"abs" becomes "_abs".  Other C compilers may not rename their externals
according to this convention.

Beyond that, I would not expect to be able to combine object modules from
2 different compilers and expect the program to work.  Besides the naming
conventions of externals, there are other things related to segmentation --
how are segments grouped, is stack segment set to the same thing as data
segment; and things like internal data representation and parameter passing
on the stack; and things like large versus medium versus small memory 
model; and things like the compiler referencing internal routines in the
C library to do things like "stack overflow checking", "large array referencing"
, "8087 emulation", etc.

I hope I interpreted your question correctly!