--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gcc/testsuite/c-c++-common/Wshift-negative-value-1.c	Fri Oct 27 22:46:09 2017 +0900
@@ -0,0 +1,50 @@
+/* PR c/65179 */
+/* { dg-do compile } */
+/* { dg-options "-O -Wextra" } */
+/* { dg-additional-options "-std=c++11" { target c++ } } */
+
+enum E {
+  A = 0 << 1,
+  B = 1 << 1,
+  C = -1 << 1, /* { dg-warning "left shift of negative value|not an integer constant" } */
+  /* { dg-error "left operand of shift expression" "shift" { target c++ } .-1 } */
+  D = 0 >> 1,
+  E = 1 >> 1,
+  F = -1 >> 1
+};
+
+int
+left (int x)
+{
+  /* Warn for LSHIFT_EXPR.  */
+  const int z = 0;
+  const int o = 1;
+  const int m = -1;
+  int r = 0;
+  r += z << x;
+  r += o << x;
+  r += m << x; /* { dg-warning "left shift of negative value" } */
+  r += 0 << x;
+  r += 1 << x;
+  r += -1 << x; /* { dg-warning "left shift of negative value" } */
+  r += -1U << x;
+  return r;
+}
+
+int
+right (int x)
+{
+  /* Shouldn't warn for RSHIFT_EXPR.  */
+  const int z = 0;
+  const int o = 1;
+  const int m = -1;
+  int r = 0;
+  r += z >> x;
+  r += o >> x;
+  r += m >> x;
+  r += 0 >> x;
+  r += 1 >> x;
+  r += -1 >> x;
+  r += -1U >> x;
+  return r;
+}