[swift-evolution] Idea: Support #if os(Darwin) as shorthand for os(iOS) || os(OSX) || os(watchOS) || os(tvOS)

[Jordan Rose]

I agree that we need something here, but I really like the property we have today that all of the "os" options are mutually exclusive. (Compare: TARGET_OS_IPHONE and TARGET_OS_IOS in <TargetConditionals.h>.) I'd be happy to invent a new predicate for this, though.

Other considerations:
- Different Linux distros?
- Common ground across BSDs?
- Unixy? (vs. Windows)

And for other platform conditions:
- Architecture subtypes?
- Architecture families? ("32-bit" is a good one.)

Jordan


> On Feb 19, 2016, at 11:19, Kevin Ballard via swift-evolution <swift-evolution at swift.org> wrote:
> 
> I'd like to see #if support os(Darwin) as shorthand for any Apple platform. This is a lot shorter to type, and it's also future-compatible if Apple ever releases another Darwin-based platform. If os(Darwin) evaluates to true, then `import Darwin` should always work, and presumably `import Foundation` as well.
> 
> Without this, I think people are going to be tempted to write `if !os(Linux)` instead of writing out all 4 Apple platforms, and this is unfortunate because it makes the assumption that Linux is the only non-Apple platform, and that's simply not true.
> 
> -Kevin Ballard
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