rjmccall added inline comments.

================
Comment at: lib/CodeGen/CGObjC.cpp:3435
+      CheckFTy, "__clang_at_available_requires_core_foundation_framework"));
+  CFLinkCheckFunc->setLinkage(llvm::GlobalValue::LinkOnceAnyLinkage);
+  CodeGenFunction CGF(*this);
----------------
Is this a public weak symbol?  Make it hidden, please.

Did you consider just adding "-framework CoreFoundation"  to the module link 
options?


Repository:
  rL LLVM

https://reviews.llvm.org/D30977



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