Wannabe contributor frustrations

[Márcio Martins via Digitalmars-d]

On Thursday, 11 February 2016 at 11:47:23 UTC, Vladimir Panteleev 
wrote:
> On Thursday, 11 February 2016 at 10:55:12 UTC, Márcio Martins 
> wrote:
>> Is there a practical reason why they are not in the same repo?
>
> No, other than trying to put them into one would grind 
> everything to a halt for a while and would probably cost us 
> more than we'd win. (All pull requests would need to be 
> recreated, for one, and a lot of tools will break.)

Would at having them as submodules of dmd ease everything?
They could be separate repos, but the makefiles would try to find 
them in the submodule location and if there, great, otherwise, 
keep business.

On a separate topic: are the official DMD releases compiled with 
the previous version of DMD or GDC? How does that work?