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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1 files changed, 73 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/is_open/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/is_open/char/1.cc
new file mode 100644
index 000000000..1b5a66ea8
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/is_open/char/1.cc
@@ -0,0 +1,73 @@
+// Copyright (C) 2001, 2002, 2003, 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/>.
+
+// 27.8.1.3 filebuf member functions
+// @require@ %-*.tst %-*.txt
+// @diff@ %-*.tst %-*.txt
+
+// various tests for filebuf::open() and filebuf::close() including
+// the non-portable functionality in the libstdc++-v3 IO library
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+const char name_01[] = "filebuf_members-1.tst";
+const char name_02[] = "filebuf_members-1.txt";
+
+// Test member functions.
+void test_01() 
+{
+  bool test __attribute__((unused)) = true;
+  const char* name_03 = "filebuf_members-3"; // empty file, need to create
+
+  std::filebuf fb_01; // in 
+  std::filebuf fb_02; // out
+  std::filebuf fb_03; // in | out
+
+  // bool is_open()
+  VERIFY( !fb_01.is_open() );
+  VERIFY( !fb_02.is_open() );
+  VERIFY( !fb_03.is_open() );
+
+  // filebuf_type* open(const char* __s, ios_base::openmode __mode)
+  fb_01.open(name_01, std::ios_base::in | std::ios_base::ate);
+  fb_02.open(name_02, std::ios_base::in | std::ios_base::out 
+	     | std::ios_base::trunc);
+  fb_03.open(name_03, std::ios_base::out | std::ios_base::trunc);
+  VERIFY( fb_01.is_open() );
+  VERIFY( fb_02.is_open() );
+  VERIFY( fb_03.is_open() );
+
+  // filebuf_type* close()
+  fb_01.close();
+  fb_02.close();
+  fb_03.close();
+  VERIFY( !fb_01.is_open() );
+  VERIFY( !fb_02.is_open() );
+  VERIFY( !fb_03.is_open() );
+}
+
+int
+main()
+{
+  test_01();
+  return 0;
+}
+
+