1 files changed, 12 insertions, 42 deletions
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index bf1c14338d..50d1117599 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -4149,50 +4149,20 @@ static void handleUuidAttr(Sema &S, Decl *D, const AttributeList &Attr) {
     S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << "uuid";
 }
 
-static bool hasOtherInheritanceAttr(Decl *D, AttributeList::Kind Kind,
-    int& Existing) {
-  if (Kind != AttributeList::AT_SingleInheritance &&
-      D->hasAttr<SingleInheritanceAttr>()) {
-    Existing = 0;
-    return true;
-  }
-  else if (Kind != AttributeList::AT_MultipleInheritance &&
-      D->hasAttr<MultipleInheritanceAttr>()) {
-    Existing = 1;
-    return true;
-  }
-  else if (Kind != AttributeList::AT_VirtualInheritance &&
-      D->hasAttr<VirtualInheritanceAttr>()) {
-    Existing = 2;
-    return true;
-  }
-  return false;
-}
-
 static void handleInheritanceAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  if (!S.LangOpts.MicrosoftExt) {
+  if (S.LangOpts.MicrosoftExt) {
+    AttributeList::Kind Kind = Attr.getKind();
+    if (Kind == AttributeList::AT_SingleInheritance)
+      D->addAttr(
+          ::new (S.Context) SingleInheritanceAttr(Attr.getRange(), S.Context));
+    else if (Kind == AttributeList::AT_MultipleInheritance)
+      D->addAttr(
+          ::new (S.Context) MultipleInheritanceAttr(Attr.getRange(), S.Context));
+    else if (Kind == AttributeList::AT_VirtualInheritance)
+      D->addAttr(
+          ::new (S.Context) VirtualInheritanceAttr(Attr.getRange(), S.Context));
+  } else
     S.Diag(Attr.getLoc(), diag::warn_attribute_ignored) << Attr.getName();
-    return;
-  }
-
-  AttributeList::Kind Kind = Attr.getKind();
-
-  int Existing;
-  if (hasOtherInheritanceAttr(D->getCanonicalDecl(), Kind, Existing)) {
-      S.Diag(Attr.getLoc(), diag::warn_ms_inheritance_already_declared) << Existing;
-      return;
-  }
-
-  if (Kind == AttributeList::AT_SingleInheritance) {
-    D->addAttr(
-        ::new (S.Context) SingleInheritanceAttr(Attr.getRange(), S.Context));
-  } else if (Kind == AttributeList::AT_MultipleInheritance) {
-    D->addAttr(
-        ::new (S.Context) MultipleInheritanceAttr(Attr.getRange(), S.Context));
-  } else if (Kind == AttributeList::AT_VirtualInheritance) {
-    D->addAttr(
-        ::new (S.Context) VirtualInheritanceAttr(Attr.getRange(), S.Context));
-  }
 }
 
 static void handlePortabilityAttr(Sema &S, Decl *D, const AttributeList &Attr) {