Quick implementation of a "useless SCC" filter using scc_map.

* src/tgbaalgos/sccfilter.hh, src/tgbaalgos/sccfilter.cc: New
files.
* src/tgbaalgos/Makefile.am: Add them.

src/tgbaalgos/sccfilter.hh

@@ -0,0 +1,34 @@
+// Copyright (C) 2009 Laboratoire de Recherche et Developpement de
+// l'Epita (LRDE).
+//
+// This file is part of Spot, a model checking library.
+//
+// Spot 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 2 of the License, or
+// (at your option) any later version.
+//
+// Spot 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 Spot; see the file COPYING.  If not, write to the Free
+// Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA.
+
+#ifndef SPOT_TGBAALGOS_SCCFILTER_HH
+# define SPOT_TGBAALGOS_SCCFILTER_HH
+
+#include "tgba/tgba.hh"
+
+namespace spot
+{
+
+  // Prune unaccepting SCCs and remove superfluous acceptance conditions.
+  tgba* scc_filter(const tgba* aut);
+
+}
+
+#endif // SPOT_TGBAALGOS_SCC_HH