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

[Graydon Hoare]

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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