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kencc: turn "function args not checked" warning into "function not declared" error if appropriate

--- a/sys/src/cmd/cc/com.c

+++ b/sys/src/cmd/cc/com.c

@@ -607,11 +607,14 @@

 		if(o | tcoma(l, r, l->type->down, 1))

 			goto bad;

 		n->type = l->type->link;

-		if(!debug['B'])

-			if(l->type->down == T || l->type->down->etype == TOLD) {

+		if(!debug['B']){

+			if(l->type->down == T)

+				diag(n, "function not declared: %F", l);

+			else if(l->type->down->etype == TOLD) {

 				nerrors--;

 				diag(n, "function args not checked: %F", l);

 			}

+		}

 		dpcheck(n);

 		break;