Here’s a simple example of how to use a C library from Go. I made a small library called libfoo.

libfoo.c

#include "libfoo.h"
int foo() {
    return 1;
}

libfoo.h

int foo();

Of course, you have to compile that as a shared object with GCC.

$ gcc -shared libfoo.c -o libfoo.so

Make sure you copy over the binary to /usr/lib/ and copy the header to /usr/include/.

The Go file.

package main

/*
#cgo LDFLAGS: -lfoo
#include <libfoo/libfoo.h>
*/
import "C"

import "fmt"

func main() {
    fmt.Println("From libfoo: ", C.foo())
}

…and that’s it. I’m playing around with libguestfs and libvirt using Go. We’ll see how that Goes. The puns never end!