warning: catch exception by value, removed

src/amdis/linear_algebra/mtl/itl/fgmres.hpp

@@ -153,7 +153,7 @@ namespace itl
       {
         y[range] = upper_trisolve(H[range][range], s[range]);
       }
-      catch (mtl::matrix_singular)
+      catch (mtl::matrix_singular const&)
       {
         continue;    // if singular then try with sub-matrix
       }

src/amdis/linear_algebra/mtl/itl/fgmres_householder.hpp

@@ -166,7 +166,7 @@ namespace itl
       {
         y[range] = upper_trisolve(H[range][range], s[range]);
       }
-      catch (mtl::matrix_singular)
+      catch (mtl::matrix_singular const&)
       {
         continue;    // if singular then try with sub-matrix
       }

src/amdis/linear_algebra/mtl/itl/gmres2.hpp

@@ -154,7 +154,7 @@ namespace itl
       {
         y[range] = upper_trisolve(H[range][range], s[range]);
       }
-      catch (mtl::matrix_singular)
+      catch (mtl::matrix_singular const&)
       {
         continue;    // if singular then try with sub-matrix
       }

src/amdis/linear_algebra/mtl/itl/gmres_householder.hpp

@@ -162,7 +162,7 @@ namespace itl
       {
         y[range] = upper_trisolve(H[range][range], s[range]);
       }
-      catch (mtl::matrix_singular)
+      catch (mtl::matrix_singular const&)
       {
         continue;    // if singular then try with sub-matrix
       }