| set(oldname "${CMAKE_CURRENT_BINARY_DIR}/input") |
| set(newname "${CMAKE_CURRENT_BINARY_DIR}/output") |
| file(WRITE "${oldname}" "") |
| execute_process(COMMAND "${CMAKE_COMMAND} -E sleep 1") |
| file(WRITE "${newname}" "") |
| file(TIMESTAMP "${newname}" before_copy UTC) |
| file(COPY_FILE "${oldname}" "${newname}" RESULT result ONLY_IF_DIFFERENT) |
| file(TIMESTAMP "${newname}" after_copy UTC) |
| if (NOT before_copy STREQUAL after_copy) |
| message(FATAL_ERROR |
| "${newname} was modified even though ONLY_IF_DIFFERENT was specified") |
| endif () |
