[buddy] execute some of the tests during "make check"

* examples/bddtest/Makefile.am, src/Makefile.am (TESTS):
Add this variable.
* examples/bddtest/bddtest.cxx: Return non-zero on error.

buddy/examples/bddtest/Makefile.am

@@ -1,3 +1,4 @@
 include ../Makefile.def
+TESTS = bddtest$(EXEEXT)
 check_PROGRAMS = bddtest
-bddtest_SOURCES = bddtest.cxx 
+bddtest_SOURCES = bddtest.cxx

buddy/examples/bddtest/bddtest.cxx

@@ -3,6 +3,7 @@
 #include <bddx.h>
 
 static const int varnum = 5;
+static int err = 0;
 
 /**************************************************************************
   Example of allsat print handler.
@@ -47,6 +48,7 @@ void test1_check(bdd x)
 {
   using namespace std ;
   double anum = bdd_satcount(x);
+  bool error = false;
 
   cout << "Checking bdd with " << setw(4) << anum << " assignments: ";
 
@@ -59,15 +61,25 @@ void test1_check(bdd x)
 
   // Now the summed set should be equal to the original set
   if (allsatSumBDD == x)
-    cout << "  Sum-OK. ";
+    {
+      cout << "  Sum-OK. ";
+    }
   else
-    cout << "  Sum-ERROR. ";
+    {
+      cout << "  Sum-ERROR. ";
+      err = 1;
+    }
 
   // The subtracted set should be empty
   if (allsatBDD == bddfalse)
-    cout << "Sub-OK.\n";
+    {
+      cout << "Sub-OK.\n";
+    }
   else
-    cout << "Sub-ERROR.\n";
+    {
+      cout << "Sub-ERROR.\n";
+      err = 1;
+    }
 }
 
 
@@ -141,5 +153,5 @@ int main()
 
   bdd_done();
 
-  return 0;
+  return err;
 }

buddy/src/Makefile.am

@@ -26,6 +26,7 @@ libbddx_la_SOURCES = \
  reorder.c \
  tree.c
 
+TESTS = bddtest$(EXEEXT)
 check_PROGRAMS = bddtest
 bddtest_SOURCES = bddtest.cxx
 bddtest_CPPFLAGS = -I$(top_builddir)