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, 100 insertions, 0 deletions

diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/in_avail/char/1.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/in_avail/char/1.cc
new file mode 100644
index 000000000..94b331867
--- /dev/null
+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/in_avail/char/1.cc
@@ -0,0 +1,100 @@
+// 2001-05-21 Benjamin Kosnik  <bkoz@redhat.com>
+
+// 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/>.
+
+// 27.8.1.4 Overridden virtual functions
+
+// { dg-require-fileio "" }
+
+#include <fstream>
+#include <testsuite_hooks.h>
+
+// @require@ %-*.tst %-*.txt
+// @diff@ %-*.tst %*.txt
+
+// NB: This test assumes that _M_buf_size == 40, and not the usual
+// buffer_size length of BUFSIZ (8192), so that overflow/underflow can be
+// simulated a bit more readily.
+// NRB (Nota Really Bene): setting it to 40 breaks the test, as intended.
+const int buffer_size = 8192;
+//const int buffer_size = 40;
+
+const char name_01[] = "filebuf_virtuals-1.txt"; // file with data in it
+const char name_02[] = "filebuf_virtuals-2.txt"; // empty file, need to create
+const char name_03[] = "filebuf_virtuals-3.txt"; // empty file, need to create
+
+class derived_filebuf: public std::filebuf
+{
+ public:
+  void
+  set_size(int_type __size) { _M_buf_size = __size; }
+};
+
+derived_filebuf fb_01; // in 
+derived_filebuf fb_02; // out
+derived_filebuf fb_03; // in | out
+
+// Initialize filebufs to be the same size regardless of platform.
+void test03()
+{
+  fb_01.set_size(buffer_size);
+  fb_02.set_size(buffer_size);
+  fb_03.set_size(buffer_size);
+}
+
+// Test overloaded virtual functions.
+void test05() 
+{
+  typedef std::filebuf::int_type 	int_type;
+  typedef std::filebuf::traits_type 	traits_type;
+  typedef std::filebuf::pos_type 	pos_type;
+  typedef std::filebuf::off_type 	off_type;
+  typedef size_t 			size_type;
+
+  bool test __attribute__((unused)) = true;
+  std::filebuf 				f_tmp;
+  std::streamoff  			strmof_1, strmof_2;
+
+  // GET
+  // int in_avail()
+  // if a read position is available, return _M_in_end - _M_in_cur.
+  // else return showmanyc.
+  strmof_1 = fb_01.in_avail();
+  strmof_2 = fb_02.in_avail();
+  VERIFY( strmof_1 == -1 );
+  VERIFY( strmof_1 == strmof_2 ); //fail because not open
+  strmof_1 = fb_03.in_avail();
+  VERIFY( strmof_1 == strmof_2 );
+  fb_01.open(name_01, std::ios_base::in);
+  fb_02.open(name_02, std::ios_base::out | std::ios_base::trunc);
+  fb_03.open(name_03, std::ios_base::out | std::ios_base::in | std::ios_base::trunc); 
+  strmof_1 = fb_01.in_avail();
+  strmof_2 = fb_02.in_avail();
+  VERIFY( strmof_1 != strmof_2 );
+  VERIFY( strmof_1 >= 0 );
+  VERIFY( strmof_2 == -1 );  // empty file
+  strmof_1 = fb_03.in_avail(); 
+  VERIFY( strmof_1  == 0 ); // empty file
+}
+
+int main() 
+{
+  test03();
+  test05();
+  return 0;
+}