[PATCH] D27827: [ObjC] CodeGen support for @available on macOS

[Erik Pilkington via Phabricator via cfe-commits]

erik.pilkington updated this revision to Diff 89067.
erik.pilkington added a comment.

This new patch just generates a call to the function `_IsOSVersionAtLeast` and branches on the result. `_IsOSVersionAtLeast` is going through review here: https://reviews.llvm.org/D30136.

I decided to parse the SystemVersion.plist file, I think mapping from kernel versions to marketing versions works for macOS, but not for iOS, as iOS tends to cling on to darwin versions for longer. For example, darwin 14.0.0 was used from iOS 7.0 until iOS 8.4.1, (based on the table here: https://www.theiphonewiki.com/wiki/Kernel) which is not fine grain enough for use with `@available`.

Thanks for taking a look!
Erik


https://reviews.llvm.org/D27827

Files:
  lib/CodeGen/CGExprScalar.cpp
  lib/CodeGen/CGObjC.cpp
  lib/CodeGen/CodeGenFunction.h
  lib/CodeGen/CodeGenModule.h
  test/CodeGenObjC/availability-check.m

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