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If I've read this correctly, D has been able to dynamic link properly for years, against it's own ABI, the C ABI, or the C++ ABI (e.g. templates, vtables up to single inheritance)

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The neat thing about Swift's ABI compatibility is that it's almost as flexible as its API compatibility, e.g.

- A library can add new fields to a struct.

- A library's parameterized types can be instantiated with new arguments.

Skimming over the D ABI docs, the compatibility seems much more rigid.

Well you can't add do either of those things in D because, pure and simple, we'd never approve the change.

Does D have an ABI spec? I imagine the garbage collector complicates it considerably.

https://dlang.org/spec/abi.html

Its both a blessing and a curse that the garbage collector doesn't complicate it all that much

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