路由器openwrt系统交叉编译环境测试代码hellloworld及makefile，liuux可以支持gcc编译，交叉编译环境需要下载OpenWrt-SDK-ar71xx-for-Linux-i686-gcc或直接下载openwrt编译出SDK 文件-Router openwrt cross-compile environment test code hellloworld and the the makefile, liuux support the gcc compiler, cross-