[!791] [bugfix][matrixev] fix compilation of dynmatrixev.hh and fmatrixev.cc

Merge branch 'bugfix/dynmatrixev-lapack-call' into 'master'

ref:core/dune-common\> when LAPACK is not found both files do not compile.

See merge request [!791]

  [!791]: gitlab.dune-project.org/core/dune-common/merge_requests/791

dune/common/dynmatrixev.hh

@@ -21,7 +21,9 @@ namespace Dune {
 
   namespace DynamicMatrixHelp {
 
+#if HAVE_LAPACK
     using Dune::FMatrixHelp::eigenValuesNonsymLapackCall;
+#endif
 
     /** \brief calculates the eigenvalues of a symmetric field matrix
         \param[in]  matrix matrix eigenvalues are calculated for
@@ -37,6 +39,8 @@ namespace Dune {
                                   std::vector<DynamicVector<K>>* eigenVectors = nullptr
       )
     {
+
+#if HAVE_LAPACK
       {
         const long int N = matrix.rows();
         const char jobvl = 'n';
@@ -91,8 +95,10 @@ namespace Dune {
           }
         }
       }
+#else // #if HAVE_LAPACK
+      DUNE_THROW(NotImplemented,"LAPACK not found!");
+#endif
     }
-
   }
 
 }

dune/common/fmatrixev.cc

@@ -250,8 +250,8 @@ namespace Dune {
       SGEEV_FORTRAN(jobvl, jobvr, n, a, lda, wr, wi, vl, ldvl, vr, ldvr,
                     work, lwork, info);
     }
-    #endif
   } // end namespace FMatrixHelp
-
 } // end namespace Dune
-#endif
+
+#endif // #if HAVE_LAPACK
+#endif // #ifndef DUNE_FMATRIXEIGENVALUES_CC