How to call the static function from another c file?

Question

I want to call a static function from another C file. But it always show \"function\" used but never defined.

In ble.c

Answer 1

I agree with Frodo and ANBU.SANKAR Still if you want to call a static function outside the file you can use examples like below.

1.c

extern (*func)();
int main(){
(func)();
return 0;}

2.c

static void call1(){
printf("a \n");
}
(*func)() = &call1;