corrected virtual function error

.gitlab-ci.yml

 ---
+before_script:
+  - source ~/toolchain
+  - export CMAKE_FLAGS="-DCMAKE_C_COMPILER='$CC' -DCMAKE_CXX_COMPILER='$CXX'"
+
 variables:
   GIT_SUBMODULE_STRATEGY: recursive
 
 debian:10 gcc-8-17:
   image: registry.dune-project.org/docker/ci/dune:2.6-debian-10-gcc-8-17
   script:
-  - duneci-standard-test
+  - dunecontrol --current all
+  - dunecontrol --current make build_tests
+  - dunecontrol --current make test
   - dunecontrol --current make examples
 
 debian:10 clang-6-libcpp-17:
   image: registry.dune-project.org/docker/ci/dune:2.6-debian-10-clang-6-libcpp-17
   script:
-  - duneci-standard-test
+  - dunecontrol --current all
+  - dunecontrol --current make build_tests
+  - dunecontrol --current make test
   - dunecontrol --current make examples
 
 debian:9 gcc-6-14:
   image: registry.dune-project.org/docker/ci/dune:2.6-debian-9-gcc-6-14
   script:
-  - duneci-standard-test
+  - dunecontrol --current all
+  - dunecontrol --current make build_tests
+  - dunecontrol --current make test
   - dunecontrol --current make examples
 
 ubuntu:18.04 clang-6-17:
   image: registry.dune-project.org/docker/ci/dune:2.6-ubuntu-18.04-clang-6-17
   script:
-  - duneci-standard-test
+  - dunecontrol --current all
+  - dunecontrol --current make build_tests
+  - dunecontrol --current make test
   - dunecontrol --current make examples

src/amdis/linear_algebra/istl/ISTL_Preconditioner.hpp

@@ -9,6 +9,7 @@ namespace AMDiS
   template <class Matrix, class VectorX, class VectorB>
   struct ISTLPreconInterface
   {
+    virtual ~ISTLPreconInterface() = default;
     using PreconBase = Dune::Preconditioner<VectorX, VectorB>;
     virtual std::unique_ptr<PreconBase> create(Matrix const& matrix) const = 0;
   };

src/amdis/linear_algebra/mtl/UmfpackRunner.hpp

@@ -46,9 +46,6 @@ namespace AMDiS
       Parameters::get(prefix + "->alloc init", allocInit_);
     }
 
-    /// Destructor
-    ~UmfpackRunnerBase() = default;
-
     /// Implementation of \ref RunnerBase::solve()
     virtual int solve(Matrix const& A, Vector& x, Vector const& b,
                       SolverInfo& solverInfo) override