Building LDC runtime for a microcontroller

Remi remigillig at
Wed Sep 16 17:59:41 UTC 2020

On Monday, 7 September 2020 at 22:13:20 UTC, Adam D. Ruppe wrote:
> On Monday, 7 September 2020 at 20:55:54 UTC, IGotD- wrote:
>> I guess this was written before betterC existed.
> Well, -betterC existed even then, but it was *completely* 
> useless. It didn't become useful until 2016 or 2017.
> But around that same time, going minimal runtime got even 
> easier, so I never really got on the betterC train anyway. On 
> my tetris webassembly thing last month, I went with a minimal 
> druntime 
> And it has some class support too in not a lot of code: 
> (and if you aren't doing classes and built-in arrays, you can 
> cut a bunch of that out too).
>> To be honest I like this approach better as it opens up for 
>> gradually adding functionality.
> Yes, indeed.
> betterC is nice that it gives a library community a shared 
> target to rally around, but for your own custom application it 
> is probably better to do your own thing (though betterC might 
> work for you too, worth considering at least).

I tried to modify the hello.d example from your blog post. It 
works without changes but when I tried to do a string 
concatenation, I'm hitting linker errors related to TypeInfo:

	lld: error: server/omg.o: undefined symbol: 

Using this in hello.d

	string tmp = "hello";
	tmp ~= " world !";

I've hit this when trying to make a minimal runtime like yours 
but I couldn't figure out from the LDC source how that happens. 
Would you be able to help me understand how to solve this __init 
symbol issue? Thanks.

- Remi.

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