LDC optimized builds causing unexpected behaviour when sharing variable between threads

[kinke]

On Wednesday, 1 June 2022 at 13:35:45 UTC, Keivan Shah wrote:
> probably will use 
> [core.atomic.atomicFence](https://dlang.org/phobos/core_atomic.html#.atomicFence) to ensure the memoryOrdering.

`core.atomic.atomic{Load,Store}` handle this:

```
void main()
{
     import std.stdio : writeln;
     import core.thread;
     import core.atomic;

     writeln("Starting...");
     shared bool done = false;
     new Thread({ atomicStore(done, true); }).start();
     while (!atomicLoad(done))
     {
     } // Wait for done
     writeln("Done!");
}
``