> macOS, Ubuntu Linux LTS, and the latest Ubuntu Linux are the current supported host development operating systems I believe that "supported" here means the t

> macOS, Ubuntu Linux LTS, and the latest Ubuntu Linux are the current supported host development operating systems I believe that "supported" here means the test suites and CI are run on those platforms. More importantly, any regressions on those platforms would be considered bugs. However, there have been partial or complete ports to several other platforms, including some weird ones. Aside from Apple platforms, I see code in-tree for Linux, CYGWIN, Windows, FreeBSD, PS4[0], Android, and Haiku[1] (a revived BeOS). And that's not some stray LLVM code, it's in the Swift compiler itself. I've read that there was/is an out-of-tree upstream port to some IBM mainframe hardware, as well. A bit tangential to your original point, but I think it's interesting. [0]https://github.com/apple/swift/commit/83901998c91f9242a133aab9721ede483e6b645e https://github.com/apple/swift/commit/83901998c91f9242a133aa... [1]https://github.com/apple/swift/commit/aee81d272f3147c0a9b610956e72a7c0772b8bcb https://github.com/apple/swift/commit/aee81d272f3147c0a9b610...