fix some implicit promotion from bool, as suggested by PVS-Studio

For #192.

* spot/parseaut/parseaut.yy, spot/parseaut/scanaut.ll,
spot/tl/randomltl.cc, spot/twa/acc.cc, spot/twaalgos/postproc.hh: Here.

spot/parseaut/parseaut.yy

@@ -2067,9 +2067,9 @@ static void fix_initial_state(result_& r)
       // Multiple initial states.  We might need to add a fake one,
       // unless one of the actual initial state has no incoming edge.
       auto& aut = r.h->aut;
-      std::vector<unsigned> has_incoming(aut->num_states(), 0);
+      std::vector<unsigned char> has_incoming(aut->num_states(), 0);
       for (auto& t: aut->edges())
-	has_incoming[t.dst] = true;
+	has_incoming[t.dst] = 1;
 
       bool found = false;
       unsigned init = 0;

spot/parseaut/scanaut.ll

@@ -425,7 +425,7 @@ namespace spot
     YY_NEW_FILE;
     hoayyreset();
     if (want_interactive)
-      yy_set_interactive(true);
+      yy_set_interactive(1);
     return 0;
   }
 
@@ -461,7 +461,7 @@ namespace spot
     YY_NEW_FILE;
     hoayyreset();
     if (want_interactive)
-      yy_set_interactive(true);
+      yy_set_interactive(1);
     return 0;
   }
 

spot/tl/randomltl.cc

 // -*- coding: utf-8 -*-
-// Copyright (C) 2008, 2009, 2010, 2011, 2012, 2014, 2015 Laboratoire
-// de Recherche et Développement de l'Epita (LRDE).
+// Copyright (C) 2008, 2009, 2010, 2011, 2012, 2014, 2015, 2016
+// Laboratoire de Recherche et Développement de l'Epita (LRDE).
 // Copyright (C) 2005 Laboratoire d'Informatique de Paris 6
 // (LIP6), département Systèmes Répartis Coopératifs (SRC), Université
 // Pierre et Marie Curie.
@@ -412,9 +412,9 @@ namespace spot
     opt_seed_ = opts.get("seed", 0);
     opt_tree_size_min_ = opts.get("tree_size_min", 15);
     opt_tree_size_max_ = opts.get("tree_size_max", 15);
-    opt_unique_ = opts.get("unique", true);
-    opt_wf_ = opts.get("wf", false);
     opt_simpl_level_ = opts.get("simplification_level", 3);
+    opt_unique_ = opts.get("unique", 1);
+    opt_wf_ = opts.get("wf", 0);
 
     const char* tok_pL = nullptr;
     const char* tok_pS = nullptr;

spot/twa/acc.cc

@@ -299,7 +299,7 @@ namespace spot
           SPOT_UNREACHABLE();
         }
       SPOT_UNREACHABLE();
-      return false;
+      return 0U;
     }
   }
 
@@ -532,7 +532,7 @@ namespace spot
     if (max)
       res = odd ? t() : f();
     else
-      res = (sets & 1) == odd ? t() : f();
+      res = ((sets & 1) == odd) ? t() : f();
 
     if (sets == 0)
       return res;

spot/twaalgos/postproc.hh

 // -*- coding: utf-8 -*-
-// Copyright (C) 2012, 2013, 2014, 2015 Laboratoire de Recherche et
-// Développement de l'Epita (LRDE).
+// Copyright (C) 2012, 2013, 2014, 2015, 2016 Laboratoire de Recherche
+// et Développement de l'Epita (LRDE).
 //
 // This file is part of Spot, a model checking library.
 //
@@ -178,7 +178,7 @@ namespace spot
     // Fine-tuning options fetched from the option_map.
     bool degen_reset_ = true;
     bool degen_order_ = false;
-    int degen_cache_ = true;
+    int degen_cache_ = 1;
     bool degen_lskip_ = true;
     bool degen_lowinit_ = false;
     bool det_scc_ = true;