Re: Calling Custom C Functions From Ada

[Larry Hazel <lhazel@mindspring.com>]

Brant wrote:
> 
> Hi Gang,
> 
> I'm trying to call a custom C function from an Ada program.  I've set
> my Ada program up using the INTERFACE pragma, but I can't seem to get
> the linker to locate the associated C object code.
> 
> I've written and built my C functions using Microsoft Visual C++; I've
> tried both static and dynamic libraries, so I get the *.lib, *.obj
> files along with a *.exp file.  I'm using a DDC-I DACS Ada compiler
> under Windows NT.
> 
> When I link my Ada code, which one of the generated C files do I need
> to reference?  No matter which I choose I get an "adalink: undefined
> reference to `MyFunction'" error, which is the same error I get when I
> don't even point to a file.  Do I need to do some tweaking of the C
> files?  Do I need to reference the specific function (as opposed to
> just a file) when I link?
> 
> Any help would be greatly appreciated!
> Thanks,
> Brant

IIRC, the C compiler mangles the name, so you must reference "_MyFunction" or
something.  I'm not sure if the name mangling is the same for different C
compilers.

Larry
-- 
Larry Hazel
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Somerville, AL 35670-5533