-- usesExplicitCgo/main.go --

package main

/*
int meaningOfLife() { return 42; }
*/
import "C"

func main() {
     println(C.meaningOfLife())
}

-- nonMainPackageUsesExplicitCgo/main.go --

package p

/*
int meaningOfLife() { return 42; }
*/
import "C"

func PrintIt() {
     println(C.meaningOfLife())