Create dynamic library

[SDGGiesbrecht (Jeremy David Giesbrecht)]

I am neither an expert on this sort of thing, nor can I fathom what your use case is, but would @_cdecl be any help?

Best way to call a Swift function from C?

There's no official way yet. Aside from name mangling, Swift functions use a different calling convention from C. Unofficially, if you're willing to deal with more than the usual amount of code breakage and compiler bugs, there's an unofficial attribute @_cdecl that does this: @_cdecl("mymodule_foo") func foo(x: Int) -> Int { return x * 2 } which you can then call from C: #include <stdint.h> intptr_t mymodule_foo(intptr_t); intptr_t invoke_foo(intptr_t x) { return mymodule_foo(x); }