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, 95 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/imbue/wchar_t/14975-2.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/imbue/wchar_t/14975-2.cc
new file mode 100644
index 000000000..dc1314556
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/imbue/wchar_t/14975-2.cc
@@ -0,0 +1,95 @@
+// { dg-require-namedlocale "en_US" }
+// { dg-require-fork "" }
+// { dg-require-mkfifo "" }
+
+// 2004-04-16  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010
+// 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 <fstream>
+#include <locale>
+#include <cstdlib>
+#include <unistd.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+// No asserts, avoid leaking the semaphore if a VERIFY fails.
+#undef _GLIBCXX_ASSERT
+
+#include <testsuite_hooks.h>
+
+// libstdc++/14975
+bool test01()
+{
+  using namespace std;
+  using namespace __gnu_test;
+  bool test __attribute__((unused)) = true;
+
+  locale loc_us = locale("en_US");
+
+  const char* name = "tmp_14975-2";
+
+  signal(SIGPIPE, SIG_IGN);
+
+  unlink(name);  
+  mkfifo(name, S_IRWXU);
+  semaphore s1;
+
+  int child = fork();
+  VERIFY( child != -1 );
+
+  if (child == 0)
+    {
+      {
+	filebuf fbin;
+	fbin.open(name, ios_base::in);
+      }
+      s1.signal();
+      exit(0);
+    }
+  
+  wfilebuf fb;
+  fb.pubimbue(loc_us);
+  wfilebuf* ret = fb.open(name, ios_base::out);
+  VERIFY( ret != 0 );
+  VERIFY( fb.is_open() );
+
+  s1.wait();
+
+  try
+    {
+      fb.sputc(L'a');
+      fb.sputc(L'b');
+      fb.pubimbue(locale::classic());
+      fb.sputc(L'c');
+      fb.close();
+    }
+  catch (std::exception&)
+    {
+    }
+
+  return test;
+}
+
+int main()
+{
+  return !test01();
+}