What is the state of Microcontroller support in d?

[Mike via Digitalmars-d]

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.