Comment by kinofcain

With regards to being able to call a Swift function from C, stevetrewick pointed me to @_cdecl early last year[0][1][2]:

    @_cdecl("foobar") public func foobar() {}

I haven't yet used it in anger, but that will compile in Swift 3.

[0]https://news.ycombinator.com/item?id=11650628

[1]https://github.com/apple/swift/commit/013aad13d4245a012cfb76...

[2]https://swiftlang.ng.bluemix.net/#/repl/d68be430e72609717f71...