1 files changed, 16 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/testsuite/g++.dg/cpp0x/constexpr-union.C b/gcc-4.9/gcc/testsuite/g++.dg/cpp0x/constexpr-union.C
new file mode 100644
index 0000000..0c3548c
--- /dev/null
+++ b/gcc-4.9/gcc/testsuite/g++.dg/cpp0x/constexpr-union.C
@@ -0,0 +1,16 @@
+// Test that we don't have to deal with type punning
+// DR 1188 says this is ill-formed
+// { dg-do compile { target c++11 } }
+
+union U
+{
+  float f;
+  unsigned char ca[sizeof(float)];
+};
+
+constexpr U u = { 1.0 };
+constexpr float f = u.f;
+constexpr unsigned char c = u.ca[0]; // { dg-error "U::ca" }
+
+constexpr double d = 1.0;
+constexpr unsigned char c2 = (unsigned char&)d; // { dg-error "char. glvalue" }