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From: a563@mindlink.UUCP (Dave Kirsch)
Newsgroups: comp.os.msdos.programmer
Subject: Re: TurboC++ link question...
Message-ID: <4296@mindlink.UUCP>
Date: 1 Jan 91 23:20:47 GMT
Organization: MIND LINK! - British Columbia, Canada
Lines: 51

> wallis@labc.enet.dec.com writes:
> 
> Msg-ID: <18616@shlump.nac.dec.com>
> Posted: 2 Jan 91 15:34:05 GMT
> 
> Org.  : Digital Equipment Corporation
> Person: Barry L. Wallis
> 
> 
> In article <1990Dec26.205710.24627@cunixf.cc.columbia.edu>,
> rk29@cunixb.cc.columbia.edu (Robert  Kulagowski) writes...
> >
> >     Briefly, my question is this:
> >       In Programmer's Journal Magazine there's been a series of articles
> >for upping graphics function speeds by writing them in assembler. I've
> >tried to link them in, but have had _no_ luck at all. The linker is giving
> me
> >an "unknown symbol" error in the modules which reference the assembler
> >routines. Now, I've already used MASM to compile the assembler source into
> >..OBJ; in the Project menu I have the 3 source files which make up the
> program.
> >Two are C, one is the .OBJ file. Can someone give me a walkthrough of
> getting
> >the linker in the IDE to include the .OBJ file? Needless to say, the manuals
> >weren't very helpful...
> 
> If you are using Turbo C++ (as opposed to Turbo C) you should define the
> prototype for the assembler routines as extern "C". For example:
> 
> extern "C" void line(int, int);
> 
> I don't have my manuals with me, but, I'm fairly sure of the above syntax.

You must have been a Fortran programmer, as that is the syntax you gave, which
is incorrect.  The syntax should be:

extern cdecl void line(int, int);

Also, cdecl declared functions will have a leading underscore (_) placed on
them.  What that means is when you link, it will be looking for "_line", not
just "line".  You have to declare the assembler function as "_line proc" not
"line proc".  Unless you are using the simple segment directives with the C
model option (i.e. "model large, c").

--
--
/// Dave 'Zoid' Kirsch UUCP: {uunet,ubc-cs}!van-bc!rsoft!mindlink!a563
Voice: (604) 585-8844        a563@mindlink.UUCP
                             Zoid@cc.sfu.ca
                       Vancouver, British Columbia
"In-no-sense?  Nonsense!" - The Art Of Noise.