root@ubuntu:/home/typ/demo# arm-none-linux-gnueabi-gcc led-a

root@ubuntu:/home/typ/demo# arm-none-linux-gnueabi-gcc led_app.c -o led_app
arm-none-linux-gnueabi-gcc:command not found
root@ubuntu:/home/typ/demo# echo $PATH
/usr/local/arm/opt/FriendlyARM/toolschain/4.4.3/bin:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
环境变量设置了,为嘛编译的时候还是arm-none-linux-gnueabi-gcc:command not found