Alexis Laferrière c44cff7c97 Add a CLI option to warn when a public decl has no availability ...

Add the command line option -require-explicit-availability to detect public
or `@usableFromInline` declarations and warn if they don't declare
an introduction OS version. This option should catch forgotten `@available`
attributes in frameworks where all services are expected to be introduced
by an OS version.

The option -require-explicit-availability-target "macOS 10.14, iOS 12.0"
can be specified for the compiler to suggest fix-its with the missing
attributes `@available(macOS 10.14, iOS 12.0, *)`.

rdar://51001662

2019-06-17 10:32:58 -07:00

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