make ellipt compile, added missing gradient method.

dune/fem-dg/test/poisson/poissonproblem.hh

@@ -243,12 +243,6 @@ public:
       data().gradExact( &x[ 0 ], &grad[ i ][ 0 ] );
   }
 
-  void jacobian(const DomainType& x,
-                JacobianRangeType& grad) const 
-  { 
-    gradient( x, grad );
-  }
-
   /**
    * @brief latex output for EocOutput
    */

dune/fem-dg/test/poisson/problemcreator.hh

@@ -4,7 +4,14 @@
 #define FEMHOWTO_POISSONSTEPPER_HH
 #include <config.h>
 
-#define WANT_ISTL 1
+//#define WANT_ISTL 1
+
+#ifndef NDEBUG 
+// enable fvector and fmatrix checking
+#define DUNE_ISTL_WITH_CHECKING
+#endif
+
+#define PROBLEMTRAITS_HAVE_STEPPERTYPE
 
 #include <dune/fem-dg/main/codegen.hh>
 #include "passtraits.hh"
@@ -198,7 +205,4 @@ struct ProblemGenerator
     return new Dune :: PoissonProblem< GridType > ( probNr );
   }
 };
-
-// include elliptic stepper
-#include <dune/fem-dg/stepper/ellipt.hh>
 #endif // FEMHOWTO_POISSONSTEPPER_HH