Jordan Rose 5ffb151f77 [ClangImporter] Predefine __swift__ in imported (Obj)C code. (#4510) ...

This macro expands to a numeric value representing the current Swift
language version; for Swift 3.1.2, it would be 30102.

See discussion in https://lists.swift.org/pipermail/swift-dev/Week-of-Mon-20160822/002754.html.

rdar://problem/26921435

2016-08-25 18:26:35 -07:00

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