1 files changed, 22 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/inherit/thunk5.C b/gcc/testsuite/g++.dg/inherit/thunk5.C
new file mode 100644
index 000000000..05dba3638
--- /dev/null
+++ b/gcc/testsuite/g++.dg/inherit/thunk5.C
@@ -0,0 +1,22 @@
+// PR c++/21123
+
+struct A
+{
+  A(const A &a);
+  const A& operator=(const A& a);
+};
+
+struct B
+{
+  virtual A f(A);
+};
+
+struct C : virtual B
+{
+  virtual A f(A);
+};
+
+A C::f(A a) 
+{
+  return a;
+}