[swift-evolution] [draft] Target environment platform condition

Karl Wagner razielim at gmail.com
Thu Oct 26 06:43:41 CDT 2017

I’m currently -1 on this, because I don’t think simulator/device is a worthwhile-enough distinction for a built-in condition.

- Are you maybe looking for a Debug/Release condition? Because we already have that, through compile-time variables (the “-D” option).
- Does your platform’s simulator/emulator expose any additional API? Great! Take a look at #canImport…
- Why else would you need to distinguish simulator/device, and why are OS and architecture not sufficient for that case?


> On 25. Oct 2017, at 05:05, Graydon Hoare via swift-evolution <swift-evolution at swift.org> wrote:
> Hi,
> I'd like to propose a variant of a very minor, additive proposal Erica Sadun posted last year, that cleans up a slightly messy idiomatic use of conditional compilation in libraries. The effects should be quite limited; I'd call it a "standard library" addition except that the repertoire of compiler-control statements isn't strictly part of the stdlib.
> Proposal is here: https://gist.github.com/graydon/809af2c726cb1a27af64435e47ef4e5d <https://gist.github.com/graydon/809af2c726cb1a27af64435e47ef4e5d>
> Implementation (minus fixits) is here: https://github.com/graydon/swift/commit/16493703ea297a1992ccd0fc4d2bcac7d078c982 <https://github.com/graydon/swift/commit/16493703ea297a1992ccd0fc4d2bcac7d078c982>
> Feedback appreciated,
> -Graydon
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