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diff --git a/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/12790-4.cc b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/12790-4.cc
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+++ b/libstdc++-v3/testsuite/27_io/basic_filebuf/seekoff/12790-4.cc
@@ -0,0 +1,72 @@
+// Copyright (C) 2003, 2005, 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
+// .
+
+// 27.8.1.4 Overridden virtual functions
+
+// { dg-require-fileio "" }
+
+#include
+#include
+#include
+#include
+
+// libstdc++/12790
+void test01()
+{
+ using namespace std;
+ using __gnu_test::pod_uchar;
+ typedef basic_filebuf::traits_type traits_type;
+
+ bool test __attribute__((unused)) = true;
+ const char* name = "tmp_seekoff_12790";
+
+ locale loc(locale::classic(),
+ new codecvt);
+
+ basic_filebuf fb;
+ fb.pubsetbuf(0, 0);
+ fb.pubimbue(loc);
+
+ fb.open(name, ios_base::in | ios_base::out | ios_base::trunc);
+ fb.sputc(pod_uchar::from('b'));
+ fb.sputc(pod_uchar::from(0xff));
+
+ // Check that seekoff sets the current state during output
+ traits_type::pos_type pos = fb.pubseekoff(0, ios_base::cur);
+ fb.sputc(pod_uchar::from('a'));
+ fb.sputc(pod_uchar::from(0xff));
+ fb.sputc(pod_uchar::from(0));
+ fb.sputc(pod_uchar::from(0));
+
+ fb.pubseekoff(0, ios_base::beg);
+ fb.sbumpc();
+ fb.sbumpc();
+
+ traits_type::int_type c = fb.sbumpc();
+ VERIFY( c != traits_type::eof() );
+ VERIFY( traits_type::eq(traits_type::to_char_type(c),
+ pod_uchar::from('a')) );
+
+ fb.close();
+}
+
+int main()
+{
+ test01();
+ return 0;
+}