1 files changed, 50 insertions, 0 deletions
diff --git a/test/SemaCXX/ms-iunknown.cpp b/test/SemaCXX/ms-iunknown.cpp
new file mode 100644
index 0000000000000..df761d56a8001
--- /dev/null
+++ b/test/SemaCXX/ms-iunknown.cpp
@@ -0,0 +1,50 @@
+// RUN: %clang_cc1 -fsyntax-only -verify -fms-extensions %s 
+
+extern "C++" struct __declspec(uuid("00000000-0000-0000-C000-000000000046")) IUnknown {
+  void foo();
+  // Definitions aren't allowed, unless they are a template.
+  template<typename T>
+  void bar(T t){}
+};
+
+struct IPropertyPageBase : public IUnknown {};
+struct IPropertyPage : public IPropertyPageBase {};
+__interface ISfFileIOPropertyPage : public IPropertyPage {};
+
+
+namespace NS {
+  struct __declspec(uuid("00000000-0000-0000-C000-000000000046")) IUnknown {};
+  // expected-error@+1 {{interface type cannot inherit from}}
+  __interface IPropertyPageBase : public IUnknown {};
+}
+
+namespace NS2 {
+extern "C++" struct __declspec(uuid("00000000-0000-0000-C000-000000000046")) IUnknown {};
+// expected-error@+1 {{interface type cannot inherit from}}
+__interface IPropertyPageBase : public IUnknown{};
+}
+
+// expected-error@+1 {{interface type cannot inherit from}}
+__interface IPropertyPageBase2 : public NS::IUnknown {};
+
+__interface temp_iface {};
+struct bad_base : temp_iface {};
+// expected-error@+1 {{interface type cannot inherit from}}
+__interface bad_inherit : public bad_base{};
+
+struct mult_inher_base : temp_iface, IUnknown {};
+// expected-error@+1 {{interface type cannot inherit from}}
+__interface bad_inherit2 : public mult_inher_base{};
+
+struct PageBase : public IUnknown {};
+struct Page3 : public PageBase {};
+struct Page4 : public PageBase {};
+__interface PropertyPage : public Page4 {};
+
+struct Page5 : public Page3, Page4{};
+// expected-error@+1 {{interface type cannot inherit from}}
+__interface PropertyPage2 : public Page5 {};
+
+__interface IF1 {};
+__interface PP : IUnknown, IF1{};
+__interface PP2 : PP, Page3, Page4{};