Graydon Hoare 8970d44675 Add "-swift-version <n>" that sets LangOpts.EffectiveLanguageVersion. ...

This flag switches the "effective language version" of the compiler,
at least to any version supported (as of this change: "3" or "3.0").

At the moment nothing uses it except the language version build
configuration statements (#if swift(...)) and various other places
that report, encode, or otherwise check version numbers.

In the future, it's intended as scaffolding for backwards compatibility.

Fixes SR-2582

2016-09-20 15:11:37 -07:00

52 KiB

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