inking...
.\Output\GPIOled.axf: Error: L6218E: Undefined symbol SysTick_CLKSourceConfig (referred from systick.o).
.\Output\GPIOled.axf: Error: L6218E: Undefined symbol SysTick_CounterCmd (referred from systick.o).
.\Output\GPIOled.axf: Error: L6218E: Undefined symbol SysTick_ITConfig (referred from systick.o).
.\Output\GPIOled.axf: Error: L6218E: Undefined symbol SysTick_SetReload (referred from systick.o).
Target not created
查找错误发现：library中没有调用stm32f10x_systick.c
总结：用到什么调用什么，时刻保持一颗清晰的头脑。