Path: utzoo!utgpu!watserv1!watmath!att!occrsh!uokmax!apple!julius.cs.uiuc.edu!wuarchive!zaphod.mps.ohio-state.edu!samsung!uunet!sjsca4!poffen
From: poffen@sj.ate.slb.com (Russ Poffenberger)
Newsgroups: comp.lang.c++
Subject: Re: C/C++ link in TC++
Message-ID: <1990Sep11.165053.24745@sj.ate.slb.com>
Date: 11 Sep 90 16:50:53 GMT
References: <4800101@m.cs.uiuc.edu>
Reply-To: poffen@sj.ate.slb.com (Russ Poffenberger)
Organization: Schlumberger Technologies, San Jose, CA.
Lines: 64

In article <4800101@m.cs.uiuc.edu> reed@m.cs.uiuc.edu writes:
>
>
>I've been trying to link C object modules with C++, both created
>using Turbo C++.  I must be doing something stupid, because the
>Turbo linker is unable to find the C reference.  I've attached a
>code sample below that fails when I do the following:
>
>	tcc -c y.c
>	tcc -c x.cpp y.obj
>
>This fails to resolve the reference to "try"
>
>Any ideas on what I'm overlooking?
>
>Thanks in advance,
>
>Dan Reed			reed@cs.uiuc.edu
>Associated Professor
>Department of Computer Science
>University of Illinois
>================================ y.c =========================
>#include <stdio.h>
>
>void try (int x)
>{
>	printf ("Value is %d\n", x);
>}
>================================ x.cpp =======================
>#include <iostream.h>
>
>extern void try(int x);
>
>main()
>{
>	int	y;
>
>	cout <<"Before call\n";
>
>	y = 10;
>	try (y);
>
>	cout<<"After call\n";
>}
>========= end of x.cpp ==========


Try this in your c++ program...

extern "C" {
  void try(int);
}

as your function prototype in x.cpp.

The problem is with naming conventions. C++ uses new internal naming
conventions so it can distinguish between instances of overloaded functions
and such. Using the above syntax forces the compiler to use standard C naming
conventions.

Russ Poffenberger               DOMAIN: poffen@sj.ate.slb.com
Schlumberger Technologies       UUCP:   {uunet,decwrl,amdahl}!sjsca4!poffen
1601 Technology Drive		CIS:	72401,276
San Jose, Ca. 95110             (408)437-5254