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
directory might differ from line-endings of the respective
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6 files changed, 457 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/1.cc
new file mode 100644
index 000000000..03fcd7d9c
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/1.cc
@@ -0,0 +1,83 @@
+// 2003-05-03  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <fstream>
+#include <locale>
+#include <string>
+#include <testsuite_hooks.h>
+
+// Check that basic_filebuf::underflow() handles
+// codecvt::always_noconv() == false and codecvt::in() == noconv.
+class NoconvCvt : public std::codecvt<char, char, std::mbstate_t>
+{
+protected:
+  virtual bool
+  do_always_noconv() const throw()
+  { return false; }
+
+  virtual result
+  do_in(state_type&, const char* from, const char*, const char*& from_next,
+	char* to, char*, char*& to_next)
+  {
+    from_next = from;
+    to_next = to;
+    return noconv;
+  }
+};
+
+void test01()
+{
+  using namespace std;
+  bool test __attribute__((unused)) = true;
+  const char* name = "filebuf_virtuals-1.txt";
+
+  string str;
+  filebuf fb;
+  filebuf::int_type c1;
+
+  if (fb.open(name, ios_base::in))
+    {  
+      while ((c1 = fb.sbumpc()) != EOF)
+	str.push_back(filebuf::traits_type::to_char_type(c1));
+      fb.close();
+    }
+
+  locale loc(locale::classic(), new NoconvCvt);
+  fb.pubimbue(loc);
+
+  if (fb.open(name, ios_base::in))
+    {
+      for (string::iterator i = str.begin(); i != str.end(); ++i)
+	{
+	  c1 = fb.sbumpc();
+	  VERIFY( c1 != filebuf::traits_type::eof() );
+	  VERIFY( c1 == filebuf::traits_type::to_int_type(*i) );
+	}
+      VERIFY( fb.sgetc() == filebuf::traits_type::eof() );
+      fb.close();
+    }
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/10097.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/10097.cc
new file mode 100644
index 000000000..af0e9141c
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/10097.cc
@@ -0,0 +1,115 @@
+// { dg-require-fork "" }
+// { dg-require-mkfifo "" }
+
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007, 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 <cstdlib>
+#include <unistd.h>
+#include <signal.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+// No asserts, avoid leaking the semaphores if a VERIFY fails.
+#undef _GLIBCXX_ASSERT
+
+#include <testsuite_hooks.h>
+
+class UnderBuf : public std::filebuf
+{
+public:
+  int_type
+  pub_underflow()
+  { return underflow(); }
+
+  std::streamsize
+  pub_showmanyc()
+  { return showmanyc(); }
+};
+
+// libstdc++/10097
+// filebuf::underflow drops characters.
+bool test16()
+{
+  using namespace std;
+  using namespace __gnu_test;
+  bool test __attribute__((unused)) = true;
+
+  const char* name = "tmp_fifo1";
+  
+  signal(SIGPIPE, SIG_IGN);
+  unlink(name);
+  
+  if (0 != mkfifo(name, S_IRWXU))
+    {
+      VERIFY( false );
+    }
+  
+  semaphore s1, s2;
+  int fval = fork();
+  if (fval == -1)
+    {
+      unlink(name);
+      VERIFY( false );
+    }
+  else if (fval == 0)
+    {
+      filebuf fbout;
+      fbout.open(name, ios_base::in|ios_base::out);
+      VERIFY( fbout.is_open() );
+      fbout.sputn("0123456789", 10);
+      fbout.pubsync();
+      s1.wait();
+      fbout.close();
+      s2.signal();
+      exit(0);
+    }
+
+  UnderBuf fb;
+  fb.open(name, ios_base::in);
+
+  fb.sgetc();
+  streamsize n = fb.pub_showmanyc();
+
+  while (n > 0)
+    {
+      --n;
+      
+      UnderBuf::int_type c = fb.pub_underflow();
+      VERIFY( c != UnderBuf::traits_type::eof() );
+      
+      fb.sbumpc();
+    }
+
+  fb.close();
+  s1.signal();
+  s2.wait();
+
+  return test;
+}
+
+int main() 
+{
+  return !test16();
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/2.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/2.cc
new file mode 100644
index 000000000..0d36be046
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/2.cc
@@ -0,0 +1,49 @@
+// 2003-06-25 Paolo Carlini <pcarlini@unitus.it>
+
+// Copyright (C) 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std;
+
+  filebuf fb_out, fb_in_out;
+  
+  fb_out.open("tmp_underflow.tst", ios::out);
+  fb_out.sputc('S');
+  fb_out.sputc('T');
+  fb_out.close();
+
+  fb_in_out.open("tmp_underflow.tst", ios::in | ios::out);
+  while (fb_in_out.sbumpc() != filebuf::traits_type::eof());
+
+  VERIFY( fb_in_out.sputc('x') == 'x' );
+  fb_in_out.close();
+}
+
+int main()
+{
+  test01();
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/3.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/3.cc
new file mode 100644
index 000000000..4de8a4d46
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/3.cc
@@ -0,0 +1,84 @@
+// Copyright (C) 2007, 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
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <cctype>
+#include <locale>
+#include <testsuite_hooks.h>
+
+class Mycvtcc
+: public std::codecvt<char, char, std::mbstate_t>
+{
+protected:
+  virtual result
+  do_in(state_type&,
+	const extern_type* from, const extern_type* from_end,
+	const extern_type*& from_next,
+	intern_type* to, intern_type* to_limit,
+	intern_type*& to_next) const
+  {
+    from_next = from, to_next = to;
+    
+    if (from_next == from_end || to_next == to_limit)
+      return partial;
+    
+    if (std::islower(*from_next))
+      *to_next = std::toupper(*from_next);
+    else
+      *to_next = *from_next;
+    ++from_next, ++to_next;
+    return ok;
+  }
+
+  virtual bool
+  do_always_noconv() const throw()
+  { return false; }
+};
+
+// See Novell Bug 255122
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std;
+
+  const char* name = "tmp_underflow_3.tst";
+  filebuf fbuf, fbufx;
+
+  fbuf.open(name, ios_base::out | ios_base::trunc);
+  VERIFY( fbuf.sputc('a') == 'a' );
+  VERIFY( fbuf.sputc('b') == 'b' );
+  VERIFY( fbuf.sputc('\n') == '\n' );
+  fbuf.close();
+
+  fbufx.pubimbue(locale(locale::classic(), new Mycvtcc));
+  fbufx.open(name, ios_base::in);
+  VERIFY( fbufx.sbumpc() == 'A' );
+  VERIFY( fbufx.sbumpc() == 'B' );
+  VERIFY( fbufx.sbumpc() == '\n' );
+  VERIFY( fbufx.sbumpc() == filebuf::traits_type::eof() );
+  fbufx.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/45841.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/45841.cc
new file mode 100644
index 000000000..a356d626e
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/45841.cc
@@ -0,0 +1,41 @@
+// Copyright (C) 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/>.
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+void test01()
+{
+  bool test __attribute__((unused)) = true;
+  using namespace std;
+
+  filebuf fb_in_out;
+
+  fb_in_out.open("tmp_underflow.tst", ios::in | ios::out | ios::trunc);
+
+  VERIFY( fb_in_out.sputc('x') == 'x' );
+  VERIFY( fb_in_out.sgetc() == filebuf::traits_type::eof() );
+  fb_in_out.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}
diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/9027.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/9027.cc
new file mode 100644
index 000000000..25f55493d
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/underflow/char/9027.cc
@@ -0,0 +1,85 @@
+// 2003-05-03  Petur Runolfsson  <peturr02@ru.is>
+
+// Copyright (C) 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+#include <locale>
+#include <fstream>
+#include <cctype>
+#include <testsuite_hooks.h>
+
+class Cvt_to_upper : public std::codecvt<char, char, std::mbstate_t>
+{
+  typedef std::codecvt<char, char, std::mbstate_t> Base;
+
+public:
+  explicit Cvt_to_upper(std::size_t refs = 0)
+  : Base(refs)
+  { }
+
+protected:
+  virtual result
+  do_in(state_type&,
+	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
+  {
+    while (from < from_end && to < to_end)
+      *to++ = std::toupper(*from++);
+    
+    to_next = to;
+    from_next = from;
+    return from == from_end ? ok : partial;
+  }
+
+  virtual bool
+  do_always_noconv() const throw()
+  {
+    return false;
+  }
+};
+
+// libstdc++/9027
+void test01()
+{
+  using namespace std;
+
+  bool test __attribute__((unused)) = true;
+  const char* name = "filebuf_virtuals-1.txt";
+  locale loc (locale::classic(), new Cvt_to_upper);	
+
+  filebuf fbin;
+  fbin.pubimbue(loc);
+  fbin.open(name, ios_base::in);
+
+  int c;
+  while ((c = fbin.sbumpc()) != EOF)
+    {
+      VERIFY( !islower(c) );
+    }
+  
+  fbin.close();
+}
+
+int main()
+{
+  test01();
+  return 0;
+}