Adding declspec to SparseGrids for dynamic build.

radixsparsegrids/cmake/Dependencies.cmake

 TRIBITS_PACKAGE_DEFINE_DEPENDENCIES(
-LIB_REQUIRED_PACKAGES radixbug
+LIB_REQUIRED_PACKAGES radixcore radixbug
 LIB_OPTIONAL_PACKAGES
 TEST_REQUIRED_PACKAGES testframework
 TEST_OPTIONAL_PACKAGES

radixsparsegrids/sparse_grids.hh

@@ -8,9 +8,11 @@
 #endif
 #include "TasmanianSparseGrid.hpp"
 
+#include "radixcore/visibility.hh"
+
 namespace radix {
 
-class SparseGrids
+class RADiX_PUBLIC SparseGrids
 {
  public:
   using TasmanianSparseGrid = TasGrid::TasmanianSparseGrid;