cmake: Don't duplicate the SPM_WITH_MPI definition

wrappers/fortran90/CMakeLists.txt

@@ -45,18 +45,23 @@ target_include_directories(spmf INTERFACE
   $<INSTALL_INTERFACE:include/spm>
   )
 
+set( SPM_ENUMS_DEFS "" )
+
 if ( SPM_INT64 )
-  set_source_files_properties( src/spmf_enums.F90 PROPERTIES COMPILE_DEFINITIONS "SPM_INT_KIND=c_int64_t" )
+  list(APPEND SPM_ENUMS_DEFS "SPM_INT_KIND=c_int64_t" )
 else()
-  set_source_files_properties( src/spmf_enums.F90 PROPERTIES COMPILE_DEFINITIONS "SPM_INT_KIND=c_int32_t" )
+  list(APPEND SPM_ENUMS_DEFS "SPM_INT_KIND=c_int32_t" )
 endif()
 
 if ( SPM_WITH_MPI )
+  list(APPEND SPM_ENUMS_DEFS "SPM_WITH_MPI" )
   target_compile_definitions(spmf INTERFACE "SPM_WITH_MPI")
   target_link_libraries( spmf PUBLIC MPI::MPI_Fortran)
   morse_export_imported_target(MPI::MPI_Fortran mpif spm)
 endif()
 
+set_source_files_properties( src/spmf_enums.F90 PROPERTIES COMPILE_DEFINITIONS "${SPM_ENUMS_DEFS}" )
+
 # export target spmf
 install(EXPORT spmfTargets
         FILE spmfTargets.cmake

wrappers/fortran90/src/spmf_enums.F90

@@ -17,8 +17,6 @@
 !>
 module spmf_enums
 
-#include "spm/config.h"
-
   use, intrinsic :: iso_c_binding
 #if defined(SPM_WITH_MPI)
   use :: mpi_f08, only : MPI_Comm, MPI_COMM_WORLD