Within a template, qualified name lookup can refer to a non-dependent type

that is not known to be a base class at template definition time due
to some dependent base class. Treat qualified name lookup that refers
to a non-static data member or function as implicit class member
access when the "this" type would be dependent.

llvm-svn: 85718

clang/lib/Sema/SemaExprCXX.cpp

@@ -2395,6 +2395,12 @@ bool Sema::isImplicitMemberReference(const CXXScopeSpec *SS, NamedDecl *D,
   // Determine whether the declaration(s) we found are actually in a base 
   // class. If not, this isn't an implicit member reference.
   ThisType = MD->getThisType(Context);
+  
+  // If the type of "this" is dependent, we can't tell if the member is in a 
+  // base class or not, so treat this as a dependent implicit member reference.
+  if (ThisType->isDependentType())
+    return true;
+  
   QualType CtxType = Context.getTypeDeclType(cast<CXXRecordDecl>(Ctx));
   QualType ClassType
     = Context.getTypeDeclType(cast<CXXRecordDecl>(MD->getParent()));

clang/test/SemaTemplate/instantiate-method.cpp

@@ -81,3 +81,20 @@ int *a(A0<int> &x0, A1<int> &x1) {
   int *y0 = x0;
   int *y1 = x1; // expected-error{{initializing}}
 }
+
+struct X0Base {
+  int &f();
+};
+
+template<typename T>
+struct X0 : X0Base {
+};
+
+template<typename U>
+struct X1 : X0<U> {
+  int &f2() { return X0Base::f(); }
+};
+
+void test_X1(X1<int> x1i) {
+  int &ir = x1i.f2();
+}