Check for UnresolvedUsingDecl when determining if a declaration is a redeclaration or not.

llvm-svn: 80383

clang/lib/Sema/SemaDecl.cpp

@@ -2899,7 +2899,7 @@ void Sema::CheckFunctionDeclaration(FunctionDecl *NewFD, NamedDecl *&PrevDecl,
     if (PrevDecl && 
         (!AllowOverloadingOfFunction(PrevDecl, Context) || 
          !IsOverload(NewFD, PrevDecl, MatchedDecl)) &&
-        !isa<UsingDecl>(PrevDecl)) {
+        !isa<UsingDecl>(PrevDecl) && !isa<UnresolvedUsingDecl>(PrevDecl)) {
       Redeclaration = true;
       Decl *OldDecl = PrevDecl;
 

clang/test/SemaCXX/using-decl-templates.cpp

@@ -14,3 +14,9 @@ template<typename T> struct B : A<T> {
 };
 
 B<int> a; // expected-note{{in instantiation of template class 'struct B<int>' requested here}}
+
+template<typename T> struct C : A<T> {
+  using A<T>::f;
+  
+  void f() { };
+};