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

[David Owens II]

Historically, that's been true. However, I wonder if the new Linux subsystem work for Windows changes this. 

https://blogs.msdn.microsoft.com/wsl/2016/04/22/windows-subsystem-for-linux-overview/

And further, will we need a check for this on Windows?

-David

Sent from my iPhone

> On May 3, 2016, at 9:07 AM, Michael Buckley via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I wouldn't personally use a Cygwin or MinGW target these days, but I can see why a Cygwin target would be useful in a Swift context. I suspect most Swift code is either going to be written for iOS/Mac, or Linux server code, including third-party libraries. Lots of Swift code will probably have some POSIX calls that wouldn't otherwise be available on Windows.
> 
>> On Tue, May 3, 2016 at 2:44 AM, hitstergtd+swiftevo--- via swift-evolution <swift-evolution at swift.org> wrote:
>> 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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>> >
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