2 files changed, 35 insertions, 3 deletions
diff --git a/clang/lib/AST/DeclObjC.cpp b/clang/lib/AST/DeclObjC.cpp
index 357c1ec5292..aedb097beef 100644
--- a/clang/lib/AST/DeclObjC.cpp
+++ b/clang/lib/AST/DeclObjC.cpp
@@ -385,11 +385,21 @@ bool ObjCInterfaceDecl::inheritsDesignatedInitializers() const {
     // misleading warnings.
     if (isIntroducingInitializers(this)) {
       data().InheritedDesignatedInitializers = DefinitionData::IDI_NotInherited;
-      return false;
     } else {
-      data().InheritedDesignatedInitializers = DefinitionData::IDI_Inherited;
-      return true;
+      if (auto SuperD = getSuperClass()) {
+        data().InheritedDesignatedInitializers =
+          SuperD->declaresOrInheritsDesignatedInitializers() ?
+            DefinitionData::IDI_Inherited :
+            DefinitionData::IDI_NotInherited;
+      } else {
+        data().InheritedDesignatedInitializers =
+          DefinitionData::IDI_NotInherited;
+      }
     }
+    assert(data().InheritedDesignatedInitializers
+             != DefinitionData::IDI_Unknown);
+    return data().InheritedDesignatedInitializers ==
+        DefinitionData::IDI_Inherited;
   }
   }
 
diff --git a/clang/test/SemaObjC/attr-designated-init.m b/clang/test/SemaObjC/attr-designated-init.m
index 3dbc2cab12d..b52e5c5d4a6 100644
--- a/clang/test/SemaObjC/attr-designated-init.m
+++ b/clang/test/SemaObjC/attr-designated-init.m
@@ -388,3 +388,25 @@ __attribute__((objc_root_class))
   return self;
 }
 @end
+
+__attribute__((objc_root_class))
+@interface RootNoDI
+-(id)init;
+@end
+
+@interface Base : RootNoDI
+@end
+
+@implementation Base
+@end
+
+@interface Derived : Base
+- (instancetype)initWithInt:(int)n NS_DESIGNATED_INITIALIZER;
+@end
+
+@implementation Derived
+- (instancetype)initWithInt:(int)n
+{
+  return [super init];
+}
+@end