设置编译器报错来提示相关性的东西用于一齐定义或设置

<设置编译报错>

　　使用预编译指令 #if （依据）， #error  "提示信息"

/* The timers module relies on xTaskGetSchedulerState(). */
#if configUSE_TIMERS == 1

    #ifndef configTIMER_TASK_PRIORITY
        #error If configUSE_TIMERS is set to 1 then configTIMER_TASK_PRIORITY must also be defined.
    #endif /* configTIMER_TASK_PRIORITY */

    #ifndef configTIMER_QUEUE_LENGTH
        #error If configUSE_TIMERS is set to 1 then configTIMER_QUEUE_LENGTH must also be defined.
    #endif /* configTIMER_QUEUE_LENGTH */

    #ifndef configTIMER_TASK_STACK_DEPTH
        #error If configUSE_TIMERS is set to 1 then configTIMER_TASK_STACK_DEPTH must also be defined.
    #endif /* configTIMER_TASK_STACK_DEPTH */

#endif /* configUSE_TIMERS */