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

[Michael Buckley]

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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> > swift-evolution at swift.org
> > https://lists.swift.org/mailman/listinfo/swift-evolution
> >
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