example.c

#include "example.h"
#include "_cgo_export.h"

void foo()
{
	bar();
}

example.go

package example

/*
#include "example.h"
*/
import "C"

// Foo is an example that does nothing in a very expensive way.
func Foo() {
	C.foo()
}

//export bar
func bar() {
	// do nothing
}

example.h

#pragma once

void foo();