--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/gcc.dg/Wswitch.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,63 @@
+/* PR c/4475, PR c++/3780 */
+/* { dg-do compile } */
+/* { dg-options "-Wswitch" } */
+
+enum e { e1, e2 };
+
+int
+foo (int i, int j, enum e ei, enum e ej, enum e ek, enum e el,
+     enum e em, enum e en, enum e eo, enum e ep)
+{
+  switch (i)
+    {
+    case 1: return 1;
+    case 2: return 2;
+    }
+  switch (j)
+    {
+    case 3: return 4;
+    case 4: return 3;
+    default: break;
+    }
+  switch (ei) /* { dg-warning "enumeration value 'e1' not handled in switch" "enum e1" } */
+    { /*{ dg-warning "enumeration value 'e2' not handled in switch" "enum e2" { target *-*-* } .-1 } */
+    }
+  switch (ej)
+    {
+    default: break;
+    }
+  switch (ek) /* { dg-warning "enumeration value 'e2' not handled in switch" "enum e2" } */
+    {
+    case e1: return 1;
+    }
+  switch (el)
+    {
+    case e1: return 1;
+    default: break;
+    }
+  switch (em)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    }
+  switch (en)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    default: break;
+    }
+  switch (eo)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    case 3: return 3; /* { dg-warning "case value '3' not in enumerated type 'enum e'" "excess 3" } */
+    }
+  switch (ep)
+    {
+    case e1: return 1;
+    case e2: return 2;
+    case 3: return 3; /* { dg-warning "case value '3' not in enumerated type 'enum e'" "excess 3" } */
+    default: break;
+    }
+  return 0;
+}