我用ucos3的模板建的工程。keil5用模板编译是没有问题，然后我添加了几个任务。编译就报错，如下：
..OBJMALLOC.axf: Error: L6218E: Undefined symbol CPU_Init (referred from main.o).
..OBJMALLOC.axf: Error: L6218E: Undefined symbol CPU_SR_Save() (referred from cpu_core.o).
..OBJMALLOC.axf: Error: L6218E: Undefined symbol CPU_SR_Restore(unsigned) (referred from cpu_core.o).
..OBJMALLOC.axf: Error: L6218E: Undefined symbol CPU_RevBits(unsigned) (referred from cpu_c.o).
..OBJMALLOC.axf: Error: L6218E: Undefined symbol Mem_Copy(void*, const void*, unsigned) (referred from lib_mem.o).
..OBJMALLOC.axf: Error: L6218E: Undefined symbol CPU_TS_TmrRd (referred from os_core.o).


这个是怎么回事？系统文件我都没有改。这个是怎么回事