Druntime stub project

[IGotD-]

On Wednesday, 18 November 2020 at 15:28:36 UTC, Denis Feklushkin 
wrote:
>
> I am an advocate of creating a separate implict hierarchy (like 
> "system.*") that content will be attached (included) by the 
> build system depending on the build target. It's simpler and 
> clearer.
>
> By the way, before starting of rework like discussed it is need 
> to go through the entire code and complete "version(Posix){...} 
> else version(Windows){...}" branches by "else static 
> assert(OSisNotSupportedMsg);". Otherwise we are doomed to very 
> interesting glitches.

We already have a "sys" folder in druntime, is that what you 
mean. Also we need both that the build system compiles the system 
specific files as well as importing based on system.

My plan is to only add version(druntimeAbstract), then hopefully 
we will not intrude on the existing OS implementation. 
version(druntimeAbstract) must be the first choice as a Posix 
operating system might choose that instead of druntimeAbstract 
when it is set.