The COM virtual tables must use the

'ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE' macro to provide padding in C++.

dlls/commdlg/filedlgbrowser.c

@@ -31,6 +31,7 @@ DEFAULT_DEBUG_CHANNEL(commdlg)
 */
 static ICOM_VTABLE(IShellBrowser) IShellBrowserImpl_Vtbl =
 {
+        ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
         /* IUnknown */
         IShellBrowserImpl_QueryInterface,
         IShellBrowserImpl_AddRef,
@@ -56,6 +57,7 @@ static ICOM_VTABLE(IShellBrowser) IShellBrowserImpl_Vtbl =
 
 static ICOM_VTABLE(ICommDlgBrowser) IShellBrowserImpl_ICommDlgBrowser_Vtbl =
 {
+        ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
         /* IUnknown */
         IShellBrowserImpl_ICommDlgBrowser_QueryInterface,
         IShellBrowserImpl_ICommDlgBrowser_AddRef,

dlls/dplayx/dpclassfactory.c

@@ -67,6 +67,7 @@ static HRESULT WINAPI DP_and_DPL_LockServer(LPCLASSFACTORY iface,BOOL dolock) {
 }
 
 static ICOM_VTABLE(IClassFactory) DP_and_DPL_Vtbl = {
+        ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
         DP_and_DPL_QueryInterface,
         DP_and_DPL_AddRef,
         DP_and_DPL_Release,

dlls/dsound/dsound_main.c

@@ -2384,6 +2384,7 @@ static HRESULT WINAPI DSCF_LockServer(LPCLASSFACTORY iface,BOOL dolock) {
 }
 
 static ICOM_VTABLE(IClassFactory) DSCF_Vtbl = {
+	ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
 	DSCF_QueryInterface,
 	DSCF_AddRef,
 	DSCF_Release,

dlls/ole32/oleobj.c

@@ -47,6 +47,7 @@ static HRESULT WINAPI    OleAdviseHolderImpl_SendOnClose (LPOLEADVISEHOLDER);
  */
 static struct ICOM_VTABLE(IOleAdviseHolder) oahvt =
 {
+    ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
     OleAdviseHolderImpl_QueryInterface,
     OleAdviseHolderImpl_AddRef,
     OleAdviseHolderImpl_Release,

dlls/oleaut32/typelib.c

@@ -347,6 +347,7 @@ static HRESULT WINAPI ITypeLib2_fnGetDocumentation2( ITypeLib * This,
 static HRESULT WINAPI ITypeLib2_fnGetAllCustData( ITypeLib * This,
         CUSTDATA *pCustData);
 static ICOM_VTABLE(ITypeLib) tlbvt = {
+    ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
     ITypeLib_fnQueryInterface,
     ITypeLib_fnAddRef,
     ITypeLib_fnRelease,
@@ -466,6 +467,7 @@ static HRESULT WINAPI ITypeInfo2_fnGetAllImplTypeCustData( ITypeInfo * This,
     UINT index, CUSTDATA *pCustData);
 
 static ICOM_VTABLE(ITypeInfo) tinfvt = {
+    ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
     ITypeInfo_fnQueryInterface,
     ITypeInfo_fnAddRef,
     ITypeInfo_fnRelease,

include/wine/obj_base.h

@@ -307,7 +307,8 @@ inline BOOL operator!=(const GUID& guidOne, const GUID& guidOther)
  *    // ...
  *
  *    static ICOM_VTABLE(IDirect3D) d3dvt = {
- *            IDirect3D_fnQueryInterface,
+ *        ICOM_MSVTABLE_COMPAT_DummyRTTIVALUE
+ *        IDirect3D_fnQueryInterface,
  *        IDirect3D_fnAdd,
  *        IDirect3D_fnAdd2,
  *        IDirect3D_fnInitialize,