comment to inform user when we have not found starpu_fxt_start_profiling in starpu

CMakeLists.txt

@@ -514,6 +514,9 @@ if( CHAMELEON_SCHED_STARPU )
             if ( STARPU_FXT_START_PROFILING_FOUND )
                 message(STATUS "Set HAVE_STARPU_FXT_PROFILING - Activate FxT profiling through StarPU")
                 add_definitions(-DHAVE_STARPU_FXT_PROFILING)
+            else()
+                message(STATUS "Looking for starpu with fxt - starpu_fxt_start_profiling test fails in StarPU")
+                message(STATUS "Check in CMakeFiles/CMakeError.log to figure out why it fails")
             endif()
         endif()
         if (CHAMELEON_USE_MPI AND STARPU_MPI_LIBRARIES)