D: How would one make a shared dynamically linked D library?

[IchorDev]

On Wednesday, 8 November 2023 at 11:48:58 UTC, BoQsc wrote:
> I would like to export some functionality as external shared 
> dynamically linked D library.
>
> Is it possible to do that in D Language

Yes, as long as the symbols you want to use externally are 
`public`, which is the default.
When it comes to linking, the main factor is usually matching 
symbol mangling. In C you would help users do this by 
distributing your header files. In D it's more common to 
distribute your source code, so if you want to distribute a 
"header" you'll need to remove your function bodies:
```d
//regular function:
int add(int x, int y) nothrow{
   x += y;
   return x;
}

//for a D "header":
int add(int x) nothrow;
```

> what are limitations?

The desired template instantiations must be generated at compile 
time, not at link time. CTFE probably won't work.

> Example of shared dynamic libraries depending on other shared 
> dynamic libraries would be great as well.

There should be no material difference to using a shared library 
from an executable binary.