shared object from go to c (re-take)

build.sh

#!/usr/bin/env sh

echo "Building go library:"
go build -o libtest.so -buildmode=c-shared ./main.go || exit

echo "Building C executible:"
clang --verbose -DUSE_SHARED_LLVM=on -L/tmp/so -ltest -I/tmp/so main.c -o main -Wall || exit

echo "Done"

main.c

#include "./libtest.h"
#include <stdio.h>

int main() {
  printf("%d\n", lifeUniverseAndEverything("Hello From C"));
  return 0;
}

main.go

package main

import "C"
import "fmt"

//export lifeUniverseAndEverything
func lifeUniverseAndEverything(name *C.char) int32 {
	fmt.Println(C.GoString(name))
	return 42
}

func main() {}