Index: test/CodeGenCXX/dllimport-base.cpp
===================================================================
--- /dev/null
+++ test/CodeGenCXX/dllimport-base.cpp
@@ -0,0 +1,48 @@
+// RUN: %clang_cc1 -triple i386-pc-windows -emit-llvm -fms-compatibility %s -x c++ -o - | FileCheck %s
+
+// CHECK: declare dllimport x86_thiscallcc void @"\01??1VirtualClass@test1@@UAE@XZ"
+// CHECK: declare dllimport x86_thiscallcc void @"\01??1VirtualClass@test2@@UAE@XZ"
+// CHECK:  declare dllimport x86_thiscallcc void @"\01??1VirtualClass@test3@@UAE@XZ"
+// CHECK-NOT: ??_DVirtualClass@@QEAAXXZ
+
+namespace test1 {
+struct __declspec(dllimport) VirtualClass {
+  virtual ~VirtualClass();
+};
+
+int main() {
+  VirtualClass c;
+  return 0;
+}
+} // namespace test1
+
+namespace test2 {
+struct BaseClass {
+  virtual ~BaseClass();
+};
+
+struct __declspec(dllimport) VirtualClass : public BaseClass {
+  virtual ~VirtualClass();
+};
+
+int main() {
+  VirtualClass c;
+  return 0;
+}
+} // namespace test2
+
+namespace test3 {
+struct BaseClass {
+  virtual ~BaseClass();
+};
+
+struct __declspec(dllimport) VirtualClass : public virtual BaseClass {
+public:
+  virtual ~VirtualClass();
+};
+
+int main() {
+  VirtualClass c;
+  return 0;
+}
+} // namespace test3