1 files changed, 30 insertions, 0 deletions
diff --git a/gcc/testsuite/g++.dg/warn/Wunused-4.C b/gcc/testsuite/g++.dg/warn/Wunused-4.C
new file mode 100644
index 00000000000..9018e92ef94
--- /dev/null
+++ b/gcc/testsuite/g++.dg/warn/Wunused-4.C
@@ -0,0 +1,30 @@
+// { dg-do compile }
+// { dg-options "-Wunused-parameter" }
+
+// Copyright (C) 2003 Free Software Foundation, Inc.
+// Contributed by Nathan Sidwell 15 Sep 2003 <nathan@codesourcery.com>
+// Origin: yotamm@mellanox.co.il
+
+
+// PR c++/9848. Missing warning
+
+struct C1 {
+  // Only use in-charge ctor
+  C1(int bi) {}  // { dg-warning "unused parameter" "" }
+};
+struct C2 {
+  // Only use base ctor
+  C2(int bi) {}  // { dg-warning "unused parameter" "" }
+};
+
+struct D : C2
+{
+  D (int) : C2 (1) {}
+};
+
+void show_compile_warning ()
+{
+  C1 c1 (1);
+  
+  D d (1);
+}