--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/Wduplicated-cond-3.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,204 @@
+/* PR c/64249 */
+/* { dg-do compile } */
+/* { dg-options "-Wall -Wno-duplicated-cond" } */
+
+#ifndef __cplusplus
+# define bool _Bool
+# define true 1
+# define false 0
+#endif
+
+extern int foo (void);
+
+int
+fn1 (int n)
+{
+  if (n == 1)
+    return -1;
+  else if (n == 2)
+    return 0;
+  else if (n == 1)
+    return 1;
+  return 0;
+}
+
+int
+fn2 (void)
+{
+  if (4)
+    return 1;
+  else if (4)
+    return 2;
+
+#define N 10
+  if (N)
+    return 3;
+  else if (N)
+    return 4;
+}
+
+int
+fn3 (int n)
+{
+  if (n == 42)
+    return 1;
+  if (n == 42)
+    return 2;
+
+  if (n)
+    if (n)
+      if (n)
+	if (n)
+	  return 42;
+
+  if (!n)
+    return 10;
+  else
+    return 11;
+}
+
+int
+fn4 (int n)
+{
+  if (n > 0)
+    {
+      if (n == 1)
+	return 1;
+      else if (n == 1)
+	return 2;
+    }
+  else if (n < 0)
+    {
+      if (n < -1)
+	return 6;
+      else if (n < -2)
+	{
+	  if (n == -10)
+	    return 3;
+	  else if (n == -10)
+	    return 4;
+	}
+    }
+  else
+    return 7;
+  return 0;
+}
+
+struct S { long p, q; };
+
+int
+fn5 (struct S *s)
+{
+  if (!s->p)
+    return 12345;
+  else if (!s->p)
+    return 1234;
+  return 0;
+}
+
+int
+fn6 (int n)
+{
+  if (n)
+    return n;
+  else if (n)
+    return n;
+  else if (n)
+    return n;
+  else if (n)
+    return n;
+  else if (n)
+    return n;
+  else if (n)
+    return n;
+  else if (n)
+    return n;
+  else if (n)
+    return n;
+  return 0;
+}
+
+int
+fn7 (int n)
+{
+  if (n == 0)
+    return 10;
+  else if (n == 1)
+    return 11;
+  else if (n == 2)
+    return 12;
+  else if (n == 3)
+    return 13;
+  else if (n == 4)
+    return 14;
+  else if (n == 5)
+    return 15;
+  else if (n == 6)
+    return 16;
+  else if (n == 7)
+    return 17;
+  else if (n == 0)
+    return 100;
+  else if (n == 1)
+    return 101;
+  else if (n == 2)
+    return 102;
+  else if (n == 3)
+    return 103;
+  else if (n == 4)
+    return 104;
+  else if (n == 5)
+    return 105;
+  else if (n == 6)
+    return 106;
+  else if (n == 7)
+    return 107;
+  return 0;
+}
+
+int
+fn8 (bool b)
+{
+  if (!b)
+    return 16;
+  else if (!b)
+    return 27;
+  else
+    return 64;
+}
+
+int
+fn9 (int i, int j, int k)
+{
+  if ((i > 0 && j > 0 && k > 0)
+      && ((i > 11 && j == 76 && k < 10)
+	  || (i < 0 && j == 99 && k > 103)))
+    return -999;
+  else
+  if ((i > 0 && j > 0 && k > 0)
+      && ((i > 11 && j == 76 && k < 10)
+	  || (i < 0 && j == 99 && k > 103)))
+    return 999;
+  else
+    return 0;
+}
+
+int
+fn10 (void)
+{
+  if (foo ())
+    return 17329;
+  else if (foo ())
+    return 18409;
+  return 0;
+}
+
+int
+fn11 (int n)
+{
+  if (++n == 10)
+    return 666;
+  else if (++n == 10)
+    return 9;
+  return 0;
+}