Unresolved external called in c++, written in assembly

[HormyAJP]

Hi all,

I'm a complete beginner to assembly and am trying to bootstrap my understanding by writing some assembly and linking it into a c++ program. So far I have a very simple project in VS Express 2008:

#include <tchar.h>

extern "C" 
{
	void clear();
}

int _tmain(int argc, _TCHAR* argv[])
{
	clear(); 
};

I also have an assembly file:

.586 
.MODEL FLAT, C     
.CODE  
clear PROC
   xor eax, eax 
   xor ebx, ebx 
   ret 
clear ENDP 
END

which defines the clear() function (poached from an online example). The assembly is successfully compiled into an obj file. However when linking I get an unresolved external:

error LNK2019: unresolved external symbol _clear referenced in function _wmain

Am I missing some "export like" command, or is the clear() function getting mangled somehow, or something else? (NB I tried chaning the definition to _clear PROC but that didn't work either)

Thanks,
Andy