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
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if you have obtained the source via the command 'git clone',
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1 files changed, 94 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/ext/ext_pointer/1_neg.cc b/libstdc++-v3/testsuite/ext/ext_pointer/1_neg.cc
new file mode 100644
index 000000000..0ceb9a659
--- /dev/null
+++ b/libstdc++-v3/testsuite/ext/ext_pointer/1_neg.cc
@@ -0,0 +1,94 @@
+// Bob Walters 10-2008
+
+// Test for Container using non-standard pointer types.
+
+// Copyright (C) 2008, 2009
+// Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+
+// { dg-do compile }
+
+#include <algorithm>
+#include <testsuite_hooks.h>
+#include <ext/pointer.h>
+
+using __gnu_cxx::_Pointer_adapter;
+using __gnu_cxx::_Relative_pointer_impl;
+using __gnu_cxx::__static_pointer_cast;
+using __gnu_cxx::__const_pointer_cast;
+
+
+struct A {
+  int i;
+};
+struct B : public A{
+  int j;
+};
+typedef _Pointer_adapter<_Relative_pointer_impl<B> > B_pointer; 
+typedef _Pointer_adapter<_Relative_pointer_impl<const B> > const_B_pointer; 
+typedef _Pointer_adapter<_Relative_pointer_impl<A> > A_pointer; 
+typedef _Pointer_adapter<_Relative_pointer_impl<const A> > const_A_pointer; 
+
+
+void test01(void) {
+  bool test __attribute__((unused)) = true;
+
+  A a;
+  B b;
+
+  A_pointer aptr( &a );
+
+  // Can't implicitly cast from A* to B*
+  B_pointer bptr1(aptr); // { dg-error "instantiated from here" 31 }
+  B_pointer bptr2(&a); // { dg-error "instantiated from here" 32 }
+
+  // but explicit cast/conversion is OK.
+  B_pointer bptr3(__static_pointer_cast<B_pointer>(aptr)); // ok
+  B_pointer bptr4(__static_pointer_cast<B_pointer>(&a)); // ok
+
+  // Can't implicitly cast from A* to B*
+  bptr1 = aptr; // { dg-error "instantiated from here" 39 }
+  bptr1 = &a; // { dg-error "instantiated from here" 40 }
+
+  // but explicit cast/conversion is OK.
+  bptr1 = __static_pointer_cast<B_pointer>(aptr); // ok
+  bptr1 = __static_pointer_cast<B_pointer>(&a); // ok
+
+  // Similarly, can't shed constness via implicit cast
+  const_A_pointer captr(&a);
+  A_pointer aptr2(captr); // { dg-error "instantiated from here" 48 }
+
+  // but explicit cast/conversion is OK.
+  A_pointer aptr3(__const_pointer_cast<A_pointer>(captr)); // ok
+
+  // Similarly, can't shed constness via implicit cast
+  aptr2 = captr; // { dg-error "instantiated from here" 54 }
+
+  // but explicit cast/conversion is OK.
+  aptr3 = __const_pointer_cast<A_pointer>(captr); // ok
+
+  // Combine explicit const cast with implicit downcast.
+  const_B_pointer cbptr(&b);
+  A_pointer aptr4(cbptr); // { dg-error "instantiated from here" 61 }
+  aptr4 = cbptr; // { dg-error "instantiated from here" 62 }
+
+  A_pointer aptr5(__const_pointer_cast<B_pointer>(cbptr)); // ok
+  aptr5 = __const_pointer_cast<B_pointer>(cbptr);  // ok
+}
+
+// { dg-prune-output "include" }