🚀 go-pugleaf

clin@xn-tech.com wrote:
[snip snip]
> I pasted some old, tested C codes to my C++ program. I got the following linker error
> 
> error L2029: '_printf' : unresolved external
> 
> In my program, I have include these libraries:
> 
> extern "C" {
> #include <dos.h>
> #include <conio.h>
> #include <ctype.h>
> #include <stdlib.h>
> #include <string.h>
> #include <stdio.h>
> #include <bios.h>
> }

Removing the `extern "C"' will do pretty much, I guess.

What's going on? The C++ compiler comes across extern "C" and starts a
different name mangling routine than without `extern "C"'. (In C all
names are mangled by a '_' prefix; this story is a little different in
C++.)

I suspect that the libraries coming with your compiler are compiled with
that compiler and thus all names in the library should be mangled in the
C++ styles. To check this you can, in some way, get information about
all the modules and names in any library.

But I'd first try removing `extern "C"', it's a lot easier ;-)

Hope this helps,
	Guus Leeuw jr.