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D.gnu - Fiber Issues on ARM

By disabling the GC, I've managed to get GDC built on ARM (Linux), and
using the patches on my ticket in Github, I've gotten Phobos and
Druntime to compile, but I'm running into issues when I try to use
fibers. Here's a simple test program:
import core.thread;
import std.stdio;

void main() {
        writeln("Calling a fiber...");
        auto fiber = new Fiber(&fiberFunc);
        writeln("back in main");

void fiberFunc() {
        writeln("Fiber says hi!");

It's pretty obvious that this program should print:
Calling a fiber...
Fiber says hi!
back in main

and on x86_64, that's what it does, but on ARM, I never get "Fiber
says hi!" I'm not sure whether it's a compiler issue or druntime
issue, but I've poked through the druntime source for the Fiber class
and I haven't seen anything obvious. Any thoughts?
Apr 19 2011