spack_cc in cmake

CMakeLists.txt

@@ -16,17 +16,20 @@ endif()
 find_package(MPI REQUIRED)
 MESSAGE (STATUS "MPI_CXX_COMPILER ${MPI_CXX_COMPILER}")
 MESSAGE (STATUS "MPI_C_COMPILER ${MPI_C_COMPILER}")
-MESSAGE (STATUS "CMAKE_Fortran_COMPILER ${CMAKE_Fortran_COMPILER}")
+MESSAGE (STATUS "MPI_Fortran_COMPILER ${MPI_Fortran_COMPILER}")
 
 if ("${MPI_C_COMPILER}" STREQUAL "MPI_C_COMPILER-NOTFOUND")
+    set(CMAKE_C_COMPILER "${SPACK_CC}")
 else()
     set(CMAKE_C_COMPILER "${MPI_C_COMPILER}")
 endif()
 if ("${MPI_CXX_COMPILER}" STREQUAL "MPI_CXX_COMPILER-NOTFOUND")
+    set(CMAKE_C_COMPILER "${SPACK_CXX}")
 else()
     set(CMAKE_CXX_COMPILER "${MPI_CXX_COMPILER}")
 endif()
 if ("${MPI_Fortran_COMPILER}" STREQUAL "MPI_Fortran_COMPILER-NOTFOUND")
+    set(CMAKE_Fortran_COMPILER "${SPACK_FC}")
 else()
     set(CMAKE_Fortran_COMPILER "${MPI_Fortran_COMPILER}")
 endif()