Cross Compile [Hello World] for OpenWrt

keywords: OpenWrt, Cross Compile, Makefile

0. download SDK from OpenWrt Downloads. NOT ImageBuilder

1. extract it to a directory. I will call this directory $(OPENWRT_SDK)

2. make symbolic link for toolchain directory. I will call this directory $(TOOLCHAIN)
   sim@host:~$ ln -s $(OPENWRT_SDK)/staging_dir/$(SO_LOOOOOOONG_NAME) $(OPENWRT_SDK)/staging_dir/toolchain

3. edit makefile depend on your system, you should edit these variables:

• STAGING_DIR
• PATH
• CC
  you will find a binary name in $(TOOLCHAIN)/bin.
  If your target board is Raspberry Pi or Pi2, It will be "arm-openwrt-linux-gcc"

You will get more detail information at http://wiki.openwrt.org/doc/devel/crosscompile

0. make hello world
   sim@host: $ make