Implement separate Fortran and C++ Drivers.

Provide Fortran driver with OpenACC to test portability close to the ICON use-case.

CMakeLists.txt

 cmake_minimum_required(VERSION 3.20)
-project(demo LANGUAGES CXX VERSION 0.0.1)
+project(demo LANGUAGES CXX Fortran VERSION 0.0.1)
 
 
 include(FetchContent)
@@ -30,15 +30,42 @@ elseif("${MU_ARCH}" STREQUAL "a100")
     set(Kokkos_ENABLE_SERIAL ON CACHE BOOL "" FORCE)
     set(Kokkos_ENABLE_CUDA ON CACHE BOOL "" FORCE)
     set(Kokkos_ARCH_AMPERE80 ON CACHE BOOL "" FORCE)
+elseif("${MU_ARCH}" STREQUAL "mi250x")
+    set(Kokkos_ENABLE_SERIAL ON CACHE BOOL "" FORCE)
+    set(Kokkos_ENABLE_HIP ON CACHE BOOL "" FORCE)
+    set(Kokkos_ARCH_AMD_GFX90A ON CACHE BOOL "" FORCE)
 else()
     message(FATAL_ERROR "${MU_ARCH} is not a valid/tested configuration, select architecture, x86_64, a100, h100, mi250x, mi300a(-unified), h100(-unified)")
 endif()
 
 FetchContent_MakeAvailable(kokkos)
 
-add_executable(demo main.cpp)
+add_executable(demo cdriver.cpp main.cpp)
 target_link_libraries(demo PUBLIC Kokkos::kokkos)
 
+set_source_files_properties(
+  fdriver.f90
+  PROPERTIES Fortran_PREPROCESS ON
+)
+
+if (Kokkos_ENABLE_CUDA OR Kokkos_ENABLE_HIP)
+  set(WITH_OPENACC_FORTRAN 1)
+else()
+  set(WITH_OPENACC_FORTRAN 0)
+endif()
+
+add_executable(fdemo fdriver.f90 main.cpp)
+target_link_libraries(fdemo PUBLIC Kokkos::kokkos)
+if (WITH_OPENACC_FORTRAN)
+  #find_package(OpenACC REQUIRED OpenACC_Fortran)
+  find_package(OpenACC)
+  if (NOT ${OpenACC_Fortran_FOUND})
+    message(FATAL_ERROR "OpenACC_Fortran_FOUND=${OpenACC_Fortran_FOUND}")
+  endif()
+  target_link_libraries(fdemo PUBLIC OpenACC::OpenACC_Fortran )
+endif()
+set_property(TARGET fdemo PROPERTY LINKER_LANGUAGE Fortran)
+
 if ("${MU_ARCH}" STREQUAL "a100")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -acc -Minfo=accel -gpu=cc80")
     add_compile_definitions(DEMO_DEVICE)
@@ -46,3 +73,7 @@ if ("${MU_ARCH}" STREQUAL "a100")
     target_link_options(demo PUBLIC "-gpu=pinned")
 endif()
 
+if ("${MU_ARCH}" STREQUAL "mi250x")
+  add_compile_definitions(DEMO_DEVICE)
+endif()
+