So what about -betterC flag?

[Laeeth Isharc via Digitalmars-d]

On Saturday, 5 September 2015 at 12:56:48 UTC, Adam D. Ruppe 
wrote:
> On Saturday, 5 September 2015 at 10:51:23 UTC, Rel wrote:
>> I remember that there was some buzz around undocumented 
>> -betterC compiler flag that should allow people get away from 
>> hard druntime dependencies and write bare metal code, drivers 
>> or kernel modules in some limited D subset.
>
>
> -betterC used to exist, not sure if it still does, but it does 
> very little and I don't think it helps much; you're still 
> basically on your own in making such code work right.

switch still there.  don't know what it does, if anything.
https://github.com/D-Programming-Language/dmd/search?utf8=%E2%9C%93&q=betterC