Example of c-shared libhello.so

hello.c

#include <stdio.h>

#include "libhello.h"

int main() {
  printf("Hello World from C!\n");

  printf("%s\n", helloWorld());

  return 0;
}

libhello.go

package main

import "C"

//export helloWorld
func helloWorld() *C.char {
	return C.CString("Hello World from Go!")
}

func main() {}

Makefile

.PHONY: all build compile clean
all: build compile

build:
	go build -buildmode=c-shared -o libhello.so libhello.go

compile:
	cc -o hello hello.c libhello.so

clean:
	rm hello libhello.h libhello.so

$ ./hello
Hello World from C!
Hello World from Go!