[PATCH] D30977: [CodeGen] Emit a CoreFoundation link guard when @available is used

[Alex Lorenz via Phabricator via cfe-commits]

arphaman created this revision.

After r297760, __isOSVersionAtLeast in compiler-rt loads the CoreFoundation symbols at runtime. This means that `@available` will always fail when used in a binary without a linked CoreFoundation.

This patch forces Clang to emit a reference to a CoreFoundation symbol when `@available` is used to ensure that linking will fail when CoreFoundation isn't linked with the build product.


Repository:
  rL LLVM

https://reviews.llvm.org/D30977

Files:
  lib/CodeGen/CGObjC.cpp
  lib/CodeGen/CodeGenModule.cpp
  lib/CodeGen/CodeGenModule.h
  test/CodeGenObjC/availability-cf-link-guard.m

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