rsmith added inline comments.

================
Comment at: lib/Frontend/InitPreprocessor.cpp:465
@@ +464,3 @@
+  if (LangOpts.CPlusPlus1z) {
+    Builder.defineMacro("__cpp_lib_atomic_is_always_lock_free", "201603");
+  }
----------------
This should be defined by the relevant library header, not by the compiler, to 
indicate the library actually provides the new symbol.


http://reviews.llvm.org/D17950



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