aarch64-poky-linux-ld: unrecognized option '-Wl,-O1'

在编译kernel前先进行工具链设置

 source /opt/poky/2.4.3/environment-setup-aarch64-poky-linux

然后make的时候发生了错误

错误提示：aarch64-poky-linux-ld: unrecognized option '-Wl,-O1'

解决办法：先进行source /opt/poky/2.4.3/environment-setup-aarch64-poky-linux，然后输入unset LDFLAGS后，再make