aaron.ballman added inline comments.

================
Comment at: include/clang/Basic/Attr.td:726
@@ +725,3 @@
+  let Args = [StringArgument<"Message", 1>,
+  // An optional string argument that enables us to provide a Fix-It.
+              StringArgument<"Replacement", 1>];
----------------
The formatting here is a bit strange.

================
Comment at: lib/Sema/SemaDeclAttr.cpp:5143
@@ +5142,3 @@
+
+  D->addAttr(::new (S.Context) DeprecatedAttr(Attr.getRange(), S.Context, Str,
+                                   Replacement,
----------------
This should move back down below the extension warning (the effect is the same, 
but logically we want to warn before attaching).

================
Comment at: utils/TableGen/ClangAttrEmitter.cpp:1234
@@ +1233,3 @@
+        if ((Spelling == "deprecated" || Spelling == "gnu::deprecated") &&
+            Variety != "GNU" && index == 1)
+          continue;
----------------
manmanren wrote:
> This does not look pretty. Maybe we can implement a function 
> writeDeprecatedValue that can skip the second argument if it is empty?
I wouldn't be opposed to that approach; we already do it for 
`writeAvailabilityValue()`, so another one for deprecated wouldn't be that 
horrible.


http://reviews.llvm.org/D17865



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