The warning this inhibits, -Wobjc-root-class, is opt-in for now. However, all clang unit tests that would trigger the warning have been updated to use -Wno-objc-root-class. <rdar://problem/7446698> llvm-svn: 154187
issue the note if it is because message is sent to a forward class declaration in delayed diagnostic. // rdar://10290322 llvm-svn: 151942