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
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2 files changed, 121 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/23_containers/map/debug/invalidation/1.cc b/libstdc++-v3/testsuite/23_containers/map/debug/invalidation/1.cc
new file mode 100644
index 000000000..a42112527
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/map/debug/invalidation/1.cc
@@ -0,0 +1,51 @@
+// Map iterator invalidation tests
+
+// Copyright (C) 2003, 2004, 2005, 2006, 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/>.
+
+#include <debug/map>
+#include <iterator>
+#include <testsuite_hooks.h>
+
+using __gnu_debug::map;
+using std::advance;
+
+bool test = true;
+
+// Assignment
+void test01()
+{
+  map<int, int> v1;
+  map<int, int> v2;
+
+  v1[17] = 42;
+
+  map<int, int>::iterator start = v1.begin();
+  map<int, int>::iterator finish = v1.end();
+  VERIFY(start._M_dereferenceable());
+  VERIFY(!finish._M_dereferenceable() && !finish._M_singular());
+
+  v1 = v2;
+  VERIFY(start._M_singular());
+  VERIFY(!finish._M_dereferenceable() && !finish._M_singular());
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/23_containers/map/debug/invalidation/2.cc b/libstdc++-v3/testsuite/23_containers/map/debug/invalidation/2.cc
new file mode 100644
index 000000000..85351da9f
--- /dev/null
+++ b/libstdc++-v3/testsuite/23_containers/map/debug/invalidation/2.cc
@@ -0,0 +1,70 @@
+// Map iterator invalidation tests
+
+// Copyright (C) 2003, 2004, 2005, 2006, 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/>.
+
+#include <debug/map>
+#include <iterator>
+#include <testsuite_hooks.h>
+
+using __gnu_debug::map;
+using std::advance;
+
+bool test = true;
+
+// Erase
+void test02()
+{
+  map<int, int> v;
+  for (int i = 0; i < 20; ++i)
+    v[i] = 20-i;
+
+  // Single element erase (middle)
+  map<int, int>::iterator before = v.begin();
+  map<int, int>::iterator at = before;
+  advance(at, 3);
+  map<int, int>::iterator after = at;
+  ++after;
+  v.erase(at);
+  VERIFY(before._M_dereferenceable());
+  VERIFY(at._M_singular());
+  VERIFY(after._M_dereferenceable());
+
+  // Multiple element erase
+  before = v.begin();
+  at = before;
+  advance(at, 3);
+  after = at;
+  advance(after, 4);
+  v.erase(at, after);
+  VERIFY(before._M_dereferenceable());
+  VERIFY(at._M_singular());
+
+  // clear()
+  before = v.begin();
+  map<int, int>::iterator finish = v.end();
+  VERIFY(before._M_dereferenceable());
+  v.clear();
+  VERIFY(before._M_singular());
+  VERIFY(!finish._M_singular() && !finish._M_dereferenceable());
+}
+
+int main()
+{
+  test02();
+  return 0;
+}