Rust/Ruby FFI

uuid.rb

require 'ffi'

module Rust
  module Uuid
    extend FFI::Library

    ffi_lib './librust_uuid-2b1863329f7b31d9-0.1.so'
    attach_function :asdf, [], :string
    attach_function :uuid_str, [], :void
  end
end

puts Rust::Uuid.asdf
puts Rust::Uuid.uuid_str

uuid.rs

#[link(name="rust_uuid", vers="0.1")];

extern mod extra;
use extra::uuid::Uuid;

#[no_mangle]
fn uuid_rust() -> ~str {
  let uuid1 = Uuid::new_v4();
  uuid1.to_str()
}

#[no_mangle]
pub extern fn asdf() -> &'static str {
  return "asdf"
}

#[no_mangle]
pub extern fn uuid_str() {
  uuid_rust();
}

#[fixed_stack_segment]
fn main() {
  println(uuid_rust());
  println(asdf());
}

uuid.rs compiled as a library with

$> rustc --lib uuid.rs

$> ruby uuid.rb
asdf

You've met with a terrible fate, haven't you?

fatal runtime error: runtime tls key not initialized
[1]    26242 abort (core dumped)  ruby uuid.rb