Attempt to fix issue with openmpi-5 and --help command to detect over…

…subscribe command line option support.

CMakeLists.txt

@@ -178,13 +178,11 @@ MESSAGE( STATUS "Compilation with mpi" )
 SET( LIBRARIES ${MPI_C_LIBRARIES} ${LIBRARIES} )
 SET( LIBRARIES ${MPI_CXX_LIBRARIES} ${LIBRARIES} )
 
-EXECUTE_PROCESS ( COMMAND  ${MPIEXEC} --help mapping
+EXECUTE_PROCESS ( COMMAND  ${MPIEXEC} --oversubscribe sleep 1
   RESULT_VARIABLE CMD_ERROR
   OUTPUT_VARIABLE CMD_OUTPUT )
 
-STRING(REGEX REPLACE "\"" " " CMD_OUT "${CMD_OUTPUT}")
-
-IF ( "${CMD_OUT}" MATCHES "oversubscribe" )
+IF ( "${CMD_ERROR}" MATCHES "0" )
   SET ( MPI_ARGS "-oversubscribe" )
 ENDIF()