Simple cgo test

main.c

#include <stdlib.h>
#include <stdio.h>

extern char * GoStrEq(char * cs1, char * st2);

int main(int argc, char ** argv) {
    char * s1;
    char * s2;
    
    if (argc == 3) {
        s1 = argv[1];
        s2 = argv[2];
        fprintf(stdout, "Got strings: `%s` and `%s`\n", s1, s2);
    } else {
        fprintf(stderr, "Need exactly 2 strings!\n");
        exit(EXIT_FAILURE);
    }

    char * res = GoStrEq(s1, s2);

    fprintf(stdout, "RESULT:\t%s\n", res);

    exit(EXIT_SUCCESS);
}

streq.go

package interop

import "C"

//export GoStrEq
func GoStrEq(cs1, cs2 *C.char) *C.char {
	s1, s2 := C.GoString(cs1), C.GoString(cs1)

	res := "nada"

	if s1 == s2 {
		res = s1 + " AND " + s2 + " ARE EQUAL STRINGS!"
	} else if s1 < s2 {
		res = s1 + " is less than " + s2
	} else {
		res = s1 + " is greater than " + s2
	}

	return C.CString(res)
}