Dynamic loading/unloading of Go shared library

build.sh

#!/bin/sh

go build -buildmode=c-shared lib.go
clang main.m -g -Wall -Werror -Wfatal-errors -pedantic -Wno-c11-extensions -Wno-unused-variable -Wno-unused-function -o main.out

lib.go

package main

import "C"
import "fmt"

//export foo
func foo(a, b int) int {
	fmt.Println("lib.foo():", a+b)
	return a + b
}

func main() {}

main.mm

#include <stdio.h>
#include <unistd.h>
#include <sys/stat.h>
#include <dlfcn.h>

typedef int (*foo_fn)();

int mtime(char *fileName) {
    struct stat fileStat;
    if (stat(fileName, &fileStat) == 0) {
        return fileStat.st_mtimespec.tv_sec;
    }
    return 0;
}

int main(int argc, const char* argv[])
{
    foo_fn foo;
    void *handle;
    int lastWrite = 0;

    while (true) {
        if (mtime("lib") > lastWrite) {
            dlclose(handle);
            lastWrite = mtime("lib");
            handle = dlopen ("lib", RTLD_LAZY);
            *(void**)(&foo) = dlsym(handle, "foo");
        }
        printf("%d\n", foo(1, 2));
        sleep(1);
    }

    dlclose(handle);
}

hi, does -buildmode=c-archive work?

My goal is to be able to make changes to a running Go game engine without needing to completely reload the game.

Did you go ahead with this idea, and if so, is any part of the code open source?