Index: lib/Sema/SemaChecking.cpp
===================================================================
--- lib/Sema/SemaChecking.cpp	(revision 182904)
+++ lib/Sema/SemaChecking.cpp	(working copy)
@@ -4020,20 +4020,23 @@
     if (const ComplexType *CT = dyn_cast<ComplexType>(T))
       T = CT->getElementType().getTypePtr();
 
-    // For enum types, use the known bit width of the enumerators.
     if (const EnumType *ET = dyn_cast<EnumType>(T)) {
-      EnumDecl *Enum = ET->getDecl();
-      if (!Enum->isCompleteDefinition())
-        return IntRange(C.getIntWidth(QualType(T, 0)), false);
+      if (C.getLangOpts().CPlusPlus) {
+        // For enum types, use the known bit width of the enumerators.
+        EnumDecl *Enum = ET->getDecl();
+        if (!Enum->isCompleteDefinition())
+          return IntRange(C.getIntWidth(QualType(T, 0)), false);
 
-      unsigned NumPositive = Enum->getNumPositiveBits();
-      unsigned NumNegative = Enum->getNumNegativeBits();
+        unsigned NumPositive = Enum->getNumPositiveBits();
+        unsigned NumNegative = Enum->getNumNegativeBits();
 
-      if (NumNegative == 0)
-        return IntRange(NumPositive, true/*NonNegative*/);
-      else
-        return IntRange(std::max(NumPositive + 1, NumNegative),
-                        false/*NonNegative*/);
+        if (NumNegative == 0)
+          return IntRange(NumPositive, true/*NonNegative*/);
+        else
+          return IntRange(std::max(NumPositive + 1, NumNegative),
+              false/*NonNegative*/);
+      } else
+        T = C.getCanonicalType(ET->getDecl()->getIntegerType().getTypePtr());
     }
 
     const BuiltinType *BT = cast<BuiltinType>(T);
Index: test/Sema/outof-range-constant-compare.c
===================================================================
--- test/Sema/outof-range-constant-compare.c	(revision 182904)
+++ test/Sema/outof-range-constant-compare.c	(working copy)
@@ -147,3 +147,11 @@
 
     return 1;
 }
+
+typedef enum {
+    alpha=0, bravo, charlie, delta, echo
+} named_t;
+
+static int bar(named_t foo) {
+    return foo > 42;
+}