obtained gcc-4.6.4.tar.bz2 from upstream website;upstream

verified gcc-4.6.4.tar.bz2.sig;
imported gcc-4.6.4 source tree from verified upstream tarball.

downloading a git-generated archive based on the 'upstream' tag
should provide you with a source tree that is binary identical
to the one extracted from the above tarball.

if you have obtained the source via the command 'git clone',
however, do note that line-endings of files in your working
directory might differ from line-endings of the respective
files in the upstream repository.

1 files changed, 76 insertions, 0 deletions

diff --git a/gcc/testsuite/g++.dg/ext/is_union.C b/gcc/testsuite/g++.dg/ext/is_union.C
new file mode 100644
index 000000000..c95f5a6e5
--- /dev/null
+++ b/gcc/testsuite/g++.dg/ext/is_union.C
@@ -0,0 +1,76 @@
+// { dg-do run }
+#include <cassert>
+
+struct A
+{
+  double a;
+  double b;
+};
+
+class B
+{
+  B() { }
+};
+
+union U
+{ 
+  double a;
+  double b;  
+};
+
+template<typename T>
+  bool
+  f()
+  { return __is_union(T); } 
+
+template<typename T>
+  class My
+  {
+  public:
+    bool
+    f()
+    { return !!__is_union(T); }
+  };
+
+template<typename T>
+  class My2
+  {
+  public:
+    static const bool trait = __is_union(T);
+  };
+
+template<typename T>
+  const bool My2<T>::trait;
+
+template<typename T, bool b = __is_union(T)>
+  struct My3_help
+  { static const bool trait = b; };
+
+template<typename T, bool b>
+  const bool My3_help<T, b>::trait;
+
+template<typename T>
+  class My3
+  {
+  public:
+    bool
+    f()
+    { return My3_help<T>::trait; }
+  };
+
+#define PTEST(T) (__is_union(T) && f<T>() \
+                  && My<T>().f() && My2<T>::trait && My3<T>().f())
+
+#define NTEST(T) (!__is_union(T) && !f<T>() \
+                  && !My<T>().f() && !My2<T>::trait && !My3<T>().f())
+
+int main()
+{
+  assert (NTEST (int));
+  assert (NTEST (void));
+  assert (NTEST (A));
+  assert (NTEST (B));
+  assert (PTEST (U));
+
+  return 0;
+}