Index: lib/CodeGen/CGVTables.cpp
===================================================================
--- lib/CodeGen/CGVTables.cpp
+++ lib/CodeGen/CGVTables.cpp
@@ -884,6 +884,9 @@
   if (CGM.getTarget().getCXXABI().isMicrosoft())
     return false;
 
+  if (CGM.getTriple().isWindowsGNUEnvironment() && RD->hasAttr<DLLImportAttr>())
+    return true;
+
   // If we have an explicit instantiation declaration (and not a
   // definition), the vtable is defined elsewhere.
   TemplateSpecializationKind TSK = RD->getTemplateSpecializationKind();
Index: test/CodeGenCXX/dllimport-missing-key.cpp
===================================================================
--- /dev/null
+++ test/CodeGenCXX/dllimport-missing-key.cpp
@@ -0,0 +1,27 @@
+// RUN: %clang_cc1 -triple i686-windows-gnu -emit-llvm -std=c++1y -O0 -o - %s -w | FileCheck --check-prefix=GNU %s
+
+class __declspec(dllimport) QObjectData {
+public:
+    virtual ~QObjectData() = 0;
+    void *ptr;
+
+    int method() const;
+};
+
+QObjectData::~QObjectData() {}
+
+int QObjectData::method() const
+{
+    return 0;
+}
+
+class LocalClass : public QObjectData {
+};
+
+void call() {
+    (new LocalClass())->method();
+}
+
+// GNU-DAG: @_ZTV11QObjectData = external dllimport
+// GNU-DAG: @_ZTS11QObjectData = linkonce_odr
+// GNU-DAG: @_ZTI11QObjectData = linkonce_odr
Index: test/CodeGenCXX/dllimport-rtti.cpp
===================================================================
--- test/CodeGenCXX/dllimport-rtti.cpp
+++ test/CodeGenCXX/dllimport-rtti.cpp
@@ -12,7 +12,7 @@
 // MSVC-DAG: @"\01??_R3S@@8" = linkonce_odr
 
 // GNU-DAG: @_ZTV1S = available_externally dllimport
-// GNU-DAG: @_ZTI1S = external dllimport
+// GNU-DAG: @_ZTI1S = linkonce_odr
 
 struct U : S {
 } u;
Index: test/CodeGenCXX/dllimport.cpp
===================================================================
--- test/CodeGenCXX/dllimport.cpp
+++ test/CodeGenCXX/dllimport.cpp
@@ -658,7 +658,7 @@
 USECLASS(W)
 // vftable:
 // MO1-DAG: @"\01??_SW@@6B@" = linkonce_odr unnamed_addr constant { [1 x i8*] } { [1 x i8*] [i8* bitcast (void (%struct.W*)* @"\01?foo@W@@UAEXXZ" to i8*)] }
-// GO1-DAG: @_ZTV1W = available_externally dllimport unnamed_addr constant { [3 x i8*] } { [3 x i8*] [i8* null, i8* null, i8* bitcast (void (%struct.W*)* @_ZN1W3fooEv to i8*)] }
+// GO1-DAG: @_ZTV1W = external dllimport unnamed_addr constant { [3 x i8*] }
 
 struct __declspec(dllimport) KeyFuncClass {
   constexpr KeyFuncClass() {}