"-swift-version 3" means Swift 3.1, not 3.0. #7883
Merged
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Put in a general mechanism for mapping user-specified "compatibility versions" to proper "effective versions" (what
#if
and@available
checking should respect). This may still be different from the intrinsic "language version"; right now master is considered a "3.1" compiler with a "Swift 4 mode", and we plan to ship a "4.0" compiler with a "Swift 3 mode" that will have a version number of something like "3.2".rdar://problem/29884401 / SR-3791