[PATCH v4 2/6] widl: Use the default interface UUID while generating type format strings for runtime classes.

[Vibhav Pant]

From: Vibhav Pant

---
 tools/widl/typegen.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/tools/widl/typegen.c b/tools/widl/typegen.c
index 76d7a2bde21..41cd3884431 100644
--- a/tools/widl/typegen.c
+++ b/tools/widl/typegen.c
@@ -3748,7 +3748,12 @@ static unsigned int write_ip_tfs(FILE *file, const attr_list_t *attrs, type_t *t
     else
     {
         const type_t *base = is_ptr(type) ? type_pointer_get_ref_type(type) : type;
-        const struct uuid *uuid = get_attrp(base->attrs, ATTR_UUID);
+        const struct uuid *uuid;
+
+        if (base->type_type == TYPE_RUNTIMECLASS)
+            base = type_runtimeclass_get_default_iface(base, 1);
+
+        uuid = get_attrp(base->attrs, ATTR_UUID);

if (! uuid)
             error("%s: interface %s missing UUID\n", __FUNCTION__, base->name);