交叉编译环境搭建教程
- 在/usr/local/下建立交叉编译器的安装目录arm 
 - sudo mkdir /usr/local/arm
- 将下载的交叉编译器包解压到/usr/local/arm目录下 
 - sudo tar jxvf cross-4.2.2-eabi.tar.bz2 -C /usr/local/arm/
- 解压成功后,修改PATH环境变量 
 - sudo vim /etc/profile
export PATH=$PATH:/usr/local/arm/4.2.2-eabi/usr/bin
Special for me:
sudo vim /etc/profile
export PATH=$PATH:/usr/local/arm/current_compiler/bin
sudo ln -sb 编译器文件夹 /usr/local/arm/current_compiler/
- 更新一下配置文件/etc/profile
 source /etc/profile
创建软链接到指定的编译器
 build.sh
 #/bin/bash
 if [ $# != 1 ] ; then
     echo "USAGE: $0 cross_compiler_dir_name"
     exit 1;
 fi
 cross_compiler=$1
 rm ./current_compiler
 ln -s ${cross_compiler} current_compiler
 echo link current_compiler to ${cross_compiler}