function(SAVE_PROGVERSION SIM_NAME)
    add_custom_target("progversion.txt")
    add_custom_command(TARGET "progversion.txt"
        COMMAND hg tip > ${CMAKE_CURRENT_BINARY_DIR}/progversion.txt
        WORKING_DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}
    )
    add_dependencies("${SIM_NAME}" "progversion.txt")
endfunction(SAVE_PROGVERSION)