[swift-evolution] #if os(Windows) and MSVC/Cygwin Compatibility

[hitstergtd+swiftevo at gmail.com]

Why is there a need to support Cygwin/MingW and their variants as a
build target for Windows? MSVC is practically free these days.

Doesn't supporting multiple different ABI targets on Windows just
complicate matters unnecessarily? Isn't MSVC enough as a build target?

I am not dejecting; rather, just wondering the actual need.

On 3 May 2016 at 06:00, Sangjin Han via swift-evolution
<swift-evolution at swift.org> wrote:
> 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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