Call a Rust function from C

call_rust_from_c.sh

#!/usr/bin/env bash

rustc --crate-type=dylib hello.rs
gcc hello.c -o hello
./hello # Just called a Rust function from C!

hello.c

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

int main() {
  void *libhello;
  libhello = dlopen("./libhello.dylib", RTLD_LAZY);
  int (*hello)();
  *(void **)(&hello) = dlsym(libhello, "call_from_c");
  hello();
  return EXIT_SUCCESS;
}

hello.rs

#[no_mangle]
pub extern "C" fn call_from_c() {
    println!("Just called a Rust function from C!");
}