* src/tgbaalgos/emptiness_stats.hh: Make sure depth() >= 0.

* src/tgbaalgos/gtec/gtec.hh (couvreur99_check, couvreur99_check_shy):
Add the poprem option.
* src/tgbaalgos/gtec/gtec.cc: Implement it.
* src/tgbaalgos/gtec/sccstack.cc, src/tgbaalgos/gtec/sccstack.hh
(scc_stack::rem, scc_stack::clear_rem,
scc_stack::connected_component::rem): New.
* src/tgbatest/ltl2tgba.cc, src/tgbatest/randtgba.cc: Add rem variants.

bench/emptchk/defs.in

@@ -0,0 +1,39 @@
+# -*- shell-script -*-
+# Copyright (C) 2005  Laboratoire d'Informatique de Paris 6 (LIP6),
+# département Systèmes Répartis Coopératifs (SRC), Université Pierre
+# et Marie Curie.
+#
+# 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.
+
+# Ensure we are running from the right directory.
+test -f ./defs || {
+   echo "defs: not found in current directory" 1>&2
+   exit 1
+}
+
+srcdir='@srcdir@'
+
+# Ensure $srcdir is set correctly.
+test -f "$srcdir/defs.in" || {
+   echo "$srcdir/defs.in not found, check \$srcdir" 1>&2
+   exit 1
+}
+
+RANDTGBA='@top_srcdir@/src/tgbatest/randtgba@EXEEXT@'
+LTL2TGBA='@top_srcdir@/src/tgbatest/ltl2tgba@EXEEXT@'
+FORMULAE=$srcdir/formulae.ltl