What is the state of Microcontroller support in d?

[Dan Walmsley via Digitalmars-d]

On Tuesday, 20 June 2017 at 11:53:07 UTC, Mike wrote:
> On Tuesday, 20 June 2017 at 11:50:56 UTC, Dan Walmsley wrote:
>
>> C:\dev\repos\STM32DBlinky\Blinky\build\obj\main.o: In function 
>> `_D4main5Point3SumMFZi':
>> C:\dev\repos\STM32DBlinky\Blinky/main.d:26: undefined 
>> reference to `_D9invariant12_d_invariantFC6ObjectZv'
>> C:\dev\repos\STM32DBlinky\Blinky/main.d:26: undefined 
>> reference to `_d_assert_msg'
>> C:\dev\repos\STM32DBlinky\Blinky\build\obj\main.o: In function 
>> `_D4main4MainFZv':
>> C:\dev\repos\STM32DBlinky\Blinky/main.d:44: undefined 
>> reference to `_d_eh_resume_unwind'
>>
>> Whats the invariant object thing?
>
> Please publish your source code and your linker script.

I'm going to shove it in a GitHub repo give me 10 mins.