{dmd, druntime} -> {dmd+druntime} i.e. Monorepo?

[IGotD-]

On Monday, 23 August 2021 at 01:01:34 UTC, max haughton wrote:
> Thesis: Develop dmd and druntime together in a monorepo, since 
> they are developed and shipped together. I think this could 
> potentially save a lot of hassle for both developers and 
> consumers, especially the former: No more waiting for druntime 
> PRs to go through, and hopefully less CI-senbugs.
>
> Antithesis?

Yes, if you for example want to develop a special druntime, then 
it is better to have dmd and druntime separated as you don't need 
the extra dmd baggage.

A similar argument can be done to merge phobos and druntime 
because they are somewhat connected as well. I'm not suggesting 
this however.

If you look at LDC, they have solved it by adding druntime and 
phobos as git submodules. This is a good idea as you get the 
exact snapshots of each version and don't have to manually set 
the version of each separate git. Why haven't the dmd repos done 
the same?