Ignore No-op casts when evaluating lvalue expressions. Fixes PR5122.

llvm-svn: 83267

clang/lib/AST/ExprConstant.cpp

@@ -180,6 +180,16 @@ public:
     { return Visit(E->getSubExpr()); }
   APValue VisitChooseExpr(const ChooseExpr *E)
     { return Visit(E->getChosenSubExpr(Info.Ctx)); }
+
+  APValue VisitCastExpr(CastExpr *E) {
+    switch (E->getCastKind()) {
+    default:
+      return APValue();
+
+    case CastExpr::CK_NoOp:
+      return Visit(E->getSubExpr());
+    }
+  }
   // FIXME: Missing: __real__, __imag__
 };
 } // end anonymous namespace

clang/test/CodeGenCXX/references.cpp

@@ -95,3 +95,8 @@ struct A {
 void f(A* a) {
   int b = a->b();
 }
+
+// PR5122
+void *foo = 0;
+void * const & kFoo = foo;
+