Deprecate reduce() in favor of ltl_simplifier.

* src/ltlvisit/reduce.hh: Mark the file as obsolete.
(reduce): Declare this function as obsolete.
* src/ltlvisit/reduce.cc: Define SKIP_DEPRECATED_WARNING
so we can include reduce.hh.
* src/sanity/includes.test: Also use SKIP_DEPRECATED_WARNING
when compiling headers.
* iface/dve2/dve2check.cc,
src/ltltest/equals.cc, src/ltltest/randltl.cc,
src/ltltest/reduc.cc, src/tgbaalgos/ltl2tgba_fm.hh,
src/tgbaalgos/ltl2tgba_fm.cc, src/tgbatest/randtgba.cc,
wrap/python/ajax/spot.in, wrap/python/spot.i: Adjust
to use ltl_simplifier.
* src/tgbatest/ltl2tgba.cc: Adjust to use ltl_simplifier,
and replace -fr1...-fr7 options by a single -fr option.
* src/tgbatest/spotlbtt.test: Adjust -fr flags accordingly.
* src/tgbatest/reductgba.cc: Do not include reduce.hh.

src/ltlvisit/reduce.cc

@@ -21,9 +21,10 @@
 // Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 // 02111-1307, USA.
 
-#include "reduce.hh"
 #include <cassert>
 #include "simplify.hh"
+#define SKIP_DEPRECATED_WARNING
+#include "reduce.hh"
 
 namespace spot
 {

src/ltlvisit/reduce.hh

@@ -27,6 +27,13 @@
 #include "ltlast/formula.hh"
 #include "ltlast/visitor.hh"
 
+#if __GNUC__
+#ifndef SKIP_DEPRECATED_WARNING
+#warning This file and its functions are deprecated.  \
+         The functionality moved to ltlvisit/simplify.hh
+#endif
+#endif
+
 namespace spot
 {
   namespace ltl
@@ -60,7 +67,14 @@ namespace spot
     /// \param opt a conjonction of spot::ltl::reduce_options specifying
     ///            which optimizations to apply.
     /// \return the reduced formula
+    ///
+    /// \deprecated Use spot::ltl::ltl_simplifier instead.
+#if __GNUC__
+    formula*
+    reduce(const formula* f, int opt = Reduce_All) __attribute__ ((deprecated));
+#else
     formula* reduce(const formula* f, int opt = Reduce_All);
+#endif
     /// @}
 
     /// \brief Check whether a formula is a pure eventuality.