Embedded D, top down?

[Henri Sundelin via D.gnu]

Hello folks,

I'm trying to evaluate a possibility to use D for an embedded 
case. We want to use the same application base from the high end 
to the low end. In this case high end means full Linux server, 
and low end must be a single chip solution, with no OS. Processor 
families may vary, only thing certain is GCC backend.

High end side is obviously a no brainer, but the low end stuff is 
a big question. We do have a requirement for OO programming and 
design by contract pre/postconditions etc. OO requirement is 
actually not too heavy, models are not dynamic or complicated, 
but are suitable for embedded in "object-based" sense what Ada83 
talked about in the olden days..

I've been trying to find what has been done in the D embedded 
area so far, and the issue turns always to the runtime itself. 
However I've not been able to find complete runtimes meant for 
embedded applications, just either full-blown or just bare-bones 
minimum stuff.

My big question is:
- is there any suitable runtime currently available for embedded?
- How much RAM would be needed for such runtime in real life?

So if anyone is working on these fronts, I'd appreciate any 
input..:)

//Henri