message: add working directory
diff: @@ -496,6 +496,7 @@ if(PYTHONINTERP_FOUND AND
  TARGET flatc
  POST_BUILD
  COMMAND ${GENERATION_SCRIPT} "${FLATBUFFERS_FLATC_EXECUTABLE}"
  + WORKING_DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}"
  COMMENT "Generating code..."
  VERBATIM)
  endif()
  