1 files changed, 7 insertions, 2 deletions
diff --git a/lib/Sema/SemaStmtAttr.cpp b/lib/Sema/SemaStmtAttr.cpp
index 3c15b7a..b268b45 100644
--- a/lib/Sema/SemaStmtAttr.cpp
+++ b/lib/Sema/SemaStmtAttr.cpp
@@ -48,11 +48,16 @@ static Attr *handleFallThroughAttr(Sema &S, Stmt *St, const AttributeList &A,
 static Attr *ProcessStmtAttribute(Sema &S, Stmt *St, const AttributeList &A,
                                   SourceRange Range) {
   switch (A.getKind()) {
+  case AttributeList::UnknownAttribute:
+    S.Diag(A.getLoc(), A.isDeclspecAttribute() ?
+           diag::warn_unhandled_ms_attribute_ignored :
+           diag::warn_unknown_attribute_ignored) << A.getName();
+    return 0;
   case AttributeList::AT_FallThrough:
     return handleFallThroughAttr(S, St, A, Range);
   default:
-    // if we're here, then we parsed an attribute, but didn't recognize it as a
-    // statement attribute => it is declaration attribute
+    // if we're here, then we parsed a known attribute, but didn't recognize
+    // it as a statement attribute => it is declaration attribute
     S.Diag(A.getRange().getBegin(), diag::warn_attribute_invalid_on_stmt)
         << A.getName()->getName() << St->getLocStart();
     return 0;