Index: unittests/ADT/DenseMapTest.cpp
===================================================================
--- unittests/ADT/DenseMapTest.cpp
+++ unittests/ADT/DenseMapTest.cpp
@@ -246,8 +246,8 @@
   EXPECT_EQ(1u, copyMap.size());
   EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
 
-  // test self-assignment.
-  copyMap = copyMap;
+  // test self-assignment. the cast is to avoid the warning.
+  copyMap = (TypeParam &)copyMap;
   EXPECT_EQ(1u, copyMap.size());
   EXPECT_EQ(this->getValue(), copyMap[this->getKey()]);
 }
@@ -261,8 +261,8 @@
   for (int Key = 0; Key < 5; ++Key)
     EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
 
-  // test self-assignment.
-  copyMap = copyMap;
+  // test self-assignment. the cast is to avoid the warning.
+  copyMap = (TypeParam &)copyMap;
   EXPECT_EQ(5u, copyMap.size());
   for (int Key = 0; Key < 5; ++Key)
     EXPECT_EQ(this->getValue(Key), copyMap[this->getKey(Key)]);
Index: unittests/ADT/SmallPtrSetTest.cpp
===================================================================
--- unittests/ADT/SmallPtrSetTest.cpp
+++ unittests/ADT/SmallPtrSetTest.cpp
@@ -27,8 +27,8 @@
   SmallPtrSet<int *, 4> s2;
   (s2 = s1).insert(&buf[2]);
 
-  // Self assign as well.
-  (s2 = s2).insert(&buf[3]);
+  // Self assign as well. The cast is to avoid the warning.
+  (s2 = (SmallPtrSet<int *, 4> &)s2).insert(&buf[3]);
 
   s1 = s2;
   EXPECT_EQ(4U, s1.size());
@@ -56,7 +56,7 @@
 
   SmallPtrSet<int *, 4> s;
   typedef SmallPtrSet<int *, 4>::iterator iter;
-  
+
   s.insert(&buf[0]);
   s.insert(&buf[1]);
   s.insert(&buf[2]);
Index: unittests/ADT/SparseBitVectorTest.cpp
===================================================================
--- unittests/ADT/SparseBitVectorTest.cpp
+++ unittests/ADT/SparseBitVectorTest.cpp
@@ -68,7 +68,7 @@
 
   Vec.set(23);
   Vec.set(234);
-  Vec = Vec;
+  Vec = (SparseBitVector<> &)Vec; // the cast is to avoid the warning.
   EXPECT_TRUE(Vec.test(23));
   EXPECT_TRUE(Vec.test(234));