d & ruby: segfault

Makefile

test: test_c.o test_d.o
	gcc -m32 -g test_d.o test_c.o -o test.so -lphobos2 -lrt -shared -lpthread

test_c.o: test.c
	gcc -c -g -m32 test.c -o test_c.o -fPIC

test_d.o: test.d
	dmd -c -m32 -g test.d -oftest_d.o -fPIC

test.c

extern void attach(void);
extern void detach(void);

void __attach(void) __attribute__((constructor));
void __detach(void) __attribute__((destructor));

void __attach(void) { attach(); }
void __detach(void) { detach(); }

test.d

module test;

import core.runtime : Runtime;
extern (C) export void attach() { Runtime.initialize(); }
extern (C) export void detach() { Runtime.terminate(); }

import std.array : array;
import std.algorithm : splitter;

extern (C) void foo() {
    array(splitter("abc", ' ')); 
}

void main() {}

test.rb

#!/usr/bin/env ruby
require 'ffi'

module Bar
    extend FFI::Library
    ffi_lib './test.so'
    attach_function :foo, [], :void
end

Bar.foo