a mysterious linking error introduced by import a library

[Johann]

On Saturday, 14 October 2023 at 18:15:11 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
> The frontend will attempt to not emit all template 
> instantiations if it thinks that the instantiation isn't used. 
> However it sometimes get this wrong, so you have to override it 
> and tell it to emit them all anyway and let the linker do the 
> eliding instead.
>
> This is a known problem of all the compilers since its done by 
> the shared frontend, rather than the glue layer.
>
> It is a bug, but given how complex and time consuming it can be 
> to minimize it to a small reproducible example, its not always 
> worth the time to try and report it.

Thanks again for your lucid explanation. I will save 
`-fall-instantiations` flag in my main memory.