stokes: also print warnings at compile time if superLU is not available

git-svn-id: svn://svn.iws.uni-stuttgart.de/DUMUX/dumux/trunk@7702 2fb0f335-1f38-0410-981e-8018bf24f1b0

test/freeflow/stokes/test_stokes.cc

@@ -29,6 +29,7 @@ int main(int argc, char** argv)
     typedef TTAG(StokesTestProblem) ProblemTypeTag;
     return Dumux::startFromDGF<ProblemTypeTag>(argc, argv);
 #else
+#warning "No SuperLU installed. Stokes currently only works with SuperLU."
     std::cout << "No SuperLU installed. Stokes currently only works with SuperLU." << std::endl;
     return 1;
 #endif

test/freeflow/stokes2c/test_stokes2c.cc

@@ -29,6 +29,7 @@ int main(int argc, char** argv)
     typedef TTAG(Stokes2cTestProblem) ProblemTypeTag;
     return Dumux::startFromDGF<ProblemTypeTag>(argc, argv);
 #else
+#warning "No SuperLU installed. Stokes currently only works with SuperLU."
     std::cout << "No SuperLU installed. Stokes currently only works with SuperLU." << std::endl;
     return 1;
 #endif

test/freeflow/stokes2cni/test_stokes2cni.cc

@@ -29,6 +29,7 @@ int main(int argc, char** argv)
     typedef TTAG(Stokes2cniTestProblem) ProblemTypeTag;
     return Dumux::startFromDGF<ProblemTypeTag>(argc, argv);
 #else
+#warning "No SuperLU installed. Stokes currently only works with SuperLU."
     std::cout << "No SuperLU installed. Stokes currently only works with SuperLU." << std::endl;
     return 1;
 #endif