Jordan Rose 3456d04925 "-swift-version 3" means Swift 3.1, not 3.0. (#7883) ...

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

2017-03-03 13:28:01 -08:00

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