---
1.Makefile里面的1.ARCH ?= CROOS_COMPILE?=
2.权限
3.make menuconfig 完后yes，保存
-------------------------------------------------------------
sem_num.c:(.text+0x1d1): undefined reference to `sem_post'
未定义
---
1.Makefile里面的1.ARCH ?= CROOS_COMPILE?=
2.权限
3.make menuconfig 完后yes，保存
-------------------------------------------------------------
sem_num.c:(.text+0x1d1): undefined reference to `sem_post'
未定义