integer type flag for nvfortran

Author: ajaypanyala

CMakeLists.txt

@@ -56,6 +56,8 @@ if(BUILD_INDEX64)
   set(CPE_ENV $ENV{PE_ENV})
   if(CPE_ENV STREQUAL "CRAY")
     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -sinteger64")
+  elseif(CPE_ENV STREQUAL "NVIDIA")
+    set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -i8")
   else()
     set(CMAKE_Fortran_FLAGS "${CMAKE_Fortran_FLAGS} -fdefault-integer-8")  
   endif()