D at 8-bit platform - some experiences

[kinke]

On Thursday, 6 July 2023 at 17:18:26 UTC, Dukc wrote:
> Note that I don't use `-Oz`. For some reason that tries to link 
> to GCC-defined function that isn't in my GCC library (maybe I 
> have a GCC version mismatch).

You might likely need the LLVM `builtins` compiler-rt library 
(built for avr obviously, and the version matching the LLVM 
version LDC was linked against): 
https://github.com/llvm/llvm-project/tree/main/compiler-rt/lib/builtins. [There's an `avr` subdirectory.]