fix exception references and known_unused

include/ALL.hpp

@@ -445,7 +445,7 @@ public:
     std::vector<int> neig;
     try {
       balancer->getNeighbors(neig);
-    } catch (CustomException e) {
+    } catch (CustomException &e) {
       std::cout << e.what() << std::endl;
       MPI_Abort(MPI_COMM_WORLD, -1);
     }
@@ -459,7 +459,7 @@ public:
   void getNeighbors(std::vector<int> &neig) {
     try {
       balancer->getNeighbors(neig);
-    } catch (CustomException e) {
+    } catch (CustomException &e) {
       std::cout << e.what() << std::endl;
       MPI_Abort(MPI_COMM_WORLD, -1);
     }
@@ -473,7 +473,7 @@ public:
   void getNeighbors(int **neig) {
     try {
       balancer->getNeighbors(neig);
-    } catch (CustomException e) {
+    } catch (CustomException &e) {
       std::cout << e.what() << std::endl;
       MPI_Abort(MPI_COMM_WORLD, -1);
     }
@@ -637,7 +637,7 @@ public:
     tag->SetValue(0, procTag);
 
     // determine extent of system
-    W global_extent[6];
+    W known_unused global_extent[6];
     W local_min[3];
     W local_max[3];
     W global_min[3];
@@ -842,7 +842,7 @@ public:
         delete[] global_vertices;
       }
 
-    } catch (CustomException e) {
+    } catch (CustomException &e) {
       std::cout << e.what() << std::endl;
       MPI_Abort(MPI_COMM_WORLD, -1);
     }