Hello swift-evolution, This is continued from PR #2351(https://github.com/apple/swift/pull/2351).
Here is the brief history. (To avoid confusion, I used MSVC refer to *-*-windows-msvc and Cygwin refer to *-*-windows-cygnus in LLVM.) I needed the #if method to distinct MSVC from Cygwin, for mapping the Int to CLongLong not CLong on MSVC. In PR #2351, I simply added 'os(Cygwin)' and restrict 'os(Windows)' to *-*-windows-msvc from *-*-windows-*, this solved my problem. Jake(@jakepetroules) pointed out that Cygwin is not an OS and it will never fixed to avoid breaking user applications. There is more participants and opinions, briefly, - introduce another new one such as 'env(cygnus)' or 'triple(Cygwin)' - the usability of the common condition 'os(Windows)' for *-*-windows-* - fundamentally, what do we gain from asking which os() is in use? - 'env()' is too vague - what the right questions? Forgive me the poor quotations of valuable opinions. I hope we find out the solution or method everybody satisfied. -Han Sangjin
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