IAR Embedded Workbench 编译器 (-compiler iar-ew)

/* void func() declared in another file */
extern void $Super$$func(int i);

int setup = 0;

void setup_func(int i) {
  setup = i;
}

/* this function should be called instead of the original extern func() */
void $Sub$$func(int i) {
  setup_foo(i); 
  /* does some extra setup work */   
  /* ... */
}

int main() {
  assert(setup = 0);
  func(1); // Should call $Sub$$func instead of $Super$$func
  assert(setup = 1);
  return 0;
}