Making compilation results deterministic (#4012)

[Simon Marlow]

On 17/09/2015 17:30, Simon Peyton Jones wrote:
>
> | We don't currently have a good way to reproduce the problem from a
> | completely clean build, however it's easy to reproduce by doing two
> | builds and leaving the .hi files from the first build in place while
> | removing the .o files
>
> Indeed.  But is determinism in the face of .hi file changes Part of the Goal?

Hopefully the wiki should clarify this.  I've just edited it a bit to 
expand on the motivation and a few other details. 
https://ghc.haskell.org/trac/ghc/wiki/DeterministicBuilds

Cheers
Simon