1.download source file crosstool-ng-1.26.0.tar.xz
2.unpack xz file
3.install tools crosstool-ng.github.io/docs/instal…
4.config user toolchain
4.1 cd "user define dest path"
4.2 ct-ng list-samples
4.3 ct-ng show-arm-unknown-linux-gnueabi
4.4 ct-ng arm-unknown-linux-gnueabi
4.5 ct-ng menuconfig
4.6 save .config in current path
4.7 ct-ng build
4.8 test
