Fix bug with NEKTAR++_LIBRARIES not being set correctly for external libraries

CMakeLists.txt

@@ -302,8 +302,9 @@ INCLUDE_DIRECTORIES(solvers)
 ADD_SUBDIRECTORY(solvers)
 
 IF (NEKTAR_BUILD_LIBRARY)
-    SET(NEKTAR++_LIBRARIES SolverUtils LibUtilities StdRegions SpatialDomains LocalRegions
-        MultiRegions Collections GlobalMapping FieldUtils NekMeshUtils)
+    # List of Nektar++ libraries will be rebuilt every configuration.
+    SET(NEKTAR++_LIBRARIES "" CACHE INTERNAL "")
+
     INCLUDE_DIRECTORIES(library)
     ADD_SUBDIRECTORY(library)
     INSTALL(EXPORT Nektar++Libraries DESTINATION ${LIB_DIR}/cmake COMPONENT dev)

cmake/NektarCommon.cmake

@@ -199,7 +199,7 @@ MACRO(ADD_NEKTAR_LIBRARY name)
     STRING(TOUPPER ${name} NEKLIB_COMPVAR)
 
     # Add name to a list so that we know for constructing dependencies.
-    SET(NEKTAR_LIBS ${NEKTAR_LIBS} ${NEKLIB_COMPONENT} CACHE INTERNAL "")
+    SET(NEKTAR++_LIBRARIES ${NEKTAR++_LIBRARIES} ${name} CACHE INTERNAL "")
 
     SET_PROPERTY(TARGET ${name} PROPERTY FOLDER ${NEKLIB_COMPONENT})
     SET_PROPERTY(TARGET ${name} PROPERTY VERSION ${NEKTAR_VERSION})