Fix PR4878 for real.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@81507 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 10 insertions, 1 deletions

diff --git a/lib/Sema/SemaExpr.cpp b/lib/Sema/SemaExpr.cpp
index a4a612306a..4df55e6762 100644
--- a/lib/Sema/SemaExpr.cpp
+++ b/lib/Sema/SemaExpr.cpp
@@ -1002,7 +1002,16 @@ Sema::BuildDeclarationNameExpr(SourceLocation Loc, NamedDecl *D,
           MarkDeclarationReferenced(Loc, D);
           if (PerformObjectMemberConversion(This, D))
             return ExprError();
-          if (DiagnoseUseOfDecl(D, Loc))
+          
+          bool ShouldCheckUse = true;
+          if (CXXMethodDecl *MD = dyn_cast<CXXMethodDecl>(D)) {
+            // Don't diagnose the use of a virtual member function unless it's
+            // explicitly qualified.
+            if (MD->isVirtual() && (!SS || !SS->isSet()))
+              ShouldCheckUse = false;
+          }
+          
+          if (ShouldCheckUse && DiagnoseUseOfDecl(D, Loc))
             return ExprError();
           return Owned(BuildMemberExpr(Context, This, true, SS, D,
                                        Loc, MemberType));