This gist documents the progress made on porting Swift to Haiku and has detailed instructions on building the toolchain from source.
Also, the sub-projects listed below show the progress of what has been completed so far in the Google Summer of Code (GSoC) period and their current statuses displayed below: (Excludes swift-llvm and swift-clang)
Please note that this is subject to frequent revisions and this information could be outdated.