[dmd-internals] DMD now requires a working D compiler to be build

[Vladimir Panteleev via Digitalmars-d]

( Replying to 
http://forum.dlang.org/post/54FB47B8.5060204@dawg.eu - sorry, 
can't post to the ML right now )

> First step towards self-hosting DDMD compiler.
> Please update your builds scripts and setups.
> https://github.com/D-Programming-Language/dmd/pull/3970

Congratulations are in order.

I have a question from Digger's perspective:

Which version of DMD will be required to build DDMD?

Will DDMD code be constrained to the feature set of DMD 2.067?

Will future DMD versions promise to never break any DDMD code 
from any point in time?

I certainly hope we aren't going to need a long daisy chain of 
DMD versions in order to build DMD completely from source...