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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11603.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11603.cc
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+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/wchar_t/11603.cc
@@ -0,0 +1,199 @@
+// Copyright (C) 2003, 2004, 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <locale>
+#include <testsuite_hooks.h>
+
+template <typename InternT, typename StateT = std::mbstate_t>
+class checksumcvt : public std::codecvt<InternT, char, StateT>
+{
+  typedef std::codecvt<InternT, char, StateT> Base;
+  static const std::size_t width = sizeof(InternT) + 1;
+
+public:
+  typedef InternT intern_type;
+  typedef char extern_type;
+
+  explicit checksumcvt(std::size_t refs = 0)
+    : Base(refs)
+  { }
+
+protected:
+  virtual std::codecvt_base::result
+  do_out(StateT&, const intern_type* from,
+	 const intern_type* from_end, const intern_type*& from_next,
+	 extern_type* to, extern_type* to_end,
+	 extern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(from_end - from),
+			  static_cast<size_t>(to_end - to) / width);
+
+    while (len--)
+      {
+	const char* p =
+	  reinterpret_cast<const char*>(from);
+	unsigned char checksum = 0;
+				
+	for (std::size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    *to++ = p[i];
+	    checksum ^= static_cast<unsigned char>(p[i]);
+	  }
+
+	*to++ = checksum;
+	++from;
+      }
+
+    from_next = from;
+    to_next = to;
+    return from_next == from_end ? std::codecvt_base::ok 
+                                 : std::codecvt_base::partial;
+  }
+
+  virtual std::codecvt_base::result
+  do_unshift(StateT&, extern_type* to,
+	     extern_type*, extern_type*& to_next) const
+  {
+    to_next = to;
+    return std::codecvt_base::ok;
+  }
+
+  virtual std::codecvt_base::result
+  do_in(StateT&, const extern_type* from,
+	const extern_type* from_end, const extern_type*& from_next,
+	intern_type* to, intern_type* to_end,
+	intern_type*& to_next) const
+  {
+    size_t len = std::min(static_cast<size_t>(to_end - to),
+			  static_cast<size_t>(from_end - from) / width);
+			
+    while (len)
+      {
+	const char* f = from;
+	intern_type tmp;
+	char* p = reinterpret_cast<char*>(&tmp);
+	unsigned char checksum = 0;
+
+	for (std::size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    p[i] = *f;
+	    checksum ^= static_cast<unsigned char>(*f++);
+	  }
+
+	if (*f++ != checksum)
+	  break;
+
+	from = f;
+	*to++ = tmp;
+	len--;
+      }
+
+    from_next = from;
+    to_next = to;
+    return len ? std::codecvt_base::error :
+      (from_next == from_end ? std::codecvt_base::ok
+                             : std::codecvt_base::partial);
+  }
+
+  virtual int
+  do_encoding() const throw()
+  { return width; }
+
+  virtual int
+  do_length(const StateT&, const extern_type* from,
+	    const extern_type* end, size_t max) const
+  {
+    size_t len = std::min(max,
+			  static_cast<size_t>(end - from) / width);
+
+    int ret = 0;
+    while (len--)
+      {
+	unsigned char checksum = 0;
+
+	for (std::size_t i = 0; i < sizeof(intern_type); ++i)
+	  {
+	    checksum ^= static_cast<unsigned char>(*from++);
+	  }
+
+	if (*from++ != checksum)
+	  break;
+
+	ret++;
+      }
+
+    return ret;
+  }
+
+  virtual int
+  do_max_length() const throw()
+  { return width; }
+
+  virtual bool
+  do_always_noconv() const throw()
+  { return false; }
+};
+
+class Buf : public std::wfilebuf
+{
+public:
+  std::streamsize pub_showmanyc()
+  { return showmanyc(); }
+  std::wfilebuf::int_type pub_underflow()
+  { return underflow(); }
+};
+
+// libstdc++/11603
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+
+  filebuf fbout;
+  fbout.open("tmp_11603", ios_base::out);
+  fbout.sputn("aaaab", 5);
+  fbout.close();
+
+  locale loc(locale::classic(), new checksumcvt<wchar_t>);
+  
+  Buf fb;
+  fb.pubimbue(loc);
+  fb.open("tmp_11603", ios_base::in);
+  VERIFY( fb.pub_showmanyc() == 1 );
+  
+  try
+    {
+      wfilebuf::int_type ret = fb.pub_underflow();
+      VERIFY( ret != wfilebuf::traits_type::eof() );
+      fb.sbumpc();
+      ret = fb.pub_underflow();
+      VERIFY( ret == wfilebuf::traits_type::eof() );
+    }
+  catch (...)
+    { }
+
+  fb.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}