>it currently relies on the Objecive-C runtime which is not present on non-Apple platforms. Maybe I misunderstand you, but this doesn't seem to be the case, at

>it currently relies on the Objecive-C runtime which is not present on non-Apple platforms. Maybe I misunderstand you, but this doesn't seem to be the case, at least not in Swift 3.0-RELEASE. I was able to use @_cdecl for a callback in a Tcl extension (https://tcl.wiki/48057 https://tcl.wiki/48057) on Linux.