调用cgo宏函数

I have a cgo program:

package main

//#define sum(a,b) (a)+(b)
import "C"

func main() {
        print(C.sum(1,2))
}

It should be very straight forward and print 3. But compilation failed:

could not determine kind of name for C.sum

As limited documentation I found with cgo and after some test, cgo works with macro constants, but how can I get it work with macro functions/arguments?

Simple, you just need a wrapper:

//#define SUM(a,b) (a)+(b)
//int sum(int a, int b) {
//  return SUM(a,b);
//}
import "C"

func main() {
    print(C.sum(1, 2))
}