c++/60049 - Right and left shift undefined behavior not an error in a constexpr

Add new test.

From-SVN: r236225

gcc/testsuite/ChangeLog

+2016-05-13  Martin Sebor  <msebor@redhat.com>
+
+	PR c++/60049
+	* g++.dg/cpp0x/constexpr-60049.C: New test.
+
 2016-05-13  Jakub Jelinek  <jakub@redhat.com>
 
 	PR bootstrap/71071

gcc/testsuite/g++.dg/cpp0x/constexpr-60049.C

+// PR c++/60049 - Right and left shift undefined behavior not an error
+//   in a constexpr
+// { dg-do compile { target c++11 } }
+// { dg-additional-options "-Wno-shift-negative-value -Wno-shift-count-negative -Wno-shift-count-overflow" }
+
+constexpr int f1 (int n) { return 1 << n; }   // { dg-error "shift expression" }
+constexpr int f2 (int n) { return 1 << n; }   // { dg-error "shift expression" }
+constexpr int f3 (int n) { return n << 1; }   // { dg-error "shift expression" }
+constexpr int f4 (int n) { return 1 >> n; }   // { dg-error "shift expression" }
+constexpr int f5 (int n) { return 1 >> n; }   // { dg-error "shift expression" }
+
+constexpr int X = __CHAR_BIT__ * sizeof (int) + 1;
+
+constexpr int x1 = f1 (X);
+constexpr int x2 = f2 (-1);
+constexpr int x3 = f3 (-1);
+constexpr int x4 = f4 (X);
+constexpr int x5 = f5 (-1);
+
+constexpr int y1 =  1 << X;   // { dg-error "shift expression" }
+constexpr int y2 =  1 << -1;  // { dg-error "shift expression" }
+constexpr int y3 = -1 << 1;   // { dg-error "shift expression" }
+constexpr int y4 =  1 >> X;   // { dg-error "shift expression" }
+constexpr int y5 =  1 >> -1;  // { dg-error "shift expression" }