[PATCH] D22697: [ObjC Availability] Consider lexical context of use of declaration when emitting availability diagnostics

[Erik Pilkington via cfe-commits]

erik.pilkington created this revision.
erik.pilkington added a reviewer: manmanren.
erik.pilkington added a subscriber: cfe-commits.

-Wpartial-availability currently fires on the following:
```
void f1() __attribute__((availability(macos, introduced=10.10)));

void f2() __attribute__((availability(macos, introduced=10.10))) {
  f1(); // warning: f1 is partially available: introduced in 10.10.
}
```
This is bad: f2 is also only available on macOS 10.10, so we know that the call to f1 is safe. This patch fixes this by considering the availability attributes of the lexical context of a use of a declaration when checking it for availability violations.

Thanks!

https://reviews.llvm.org/D22697

Files:
  include/clang/AST/DeclBase.h
  include/clang/Sema/Sema.h
  lib/AST/DeclBase.cpp
  lib/Sema/SemaDeclAttr.cpp
  lib/Sema/SemaExpr.cpp
  test/SemaObjC/attr-availability.m

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