Using "Ccache" to improve compiler time
1. Install "Ccache"
2. Create a path for compiler
ls /usr/lib/ccache
mkdir /usr/lib/ccache
pushd . //keep current path
cd /usr/lib/ccache
sudo ln -s ../../bin/ccache arm-marvell-linux-gnueabi-gcc
sudo ln -s ../../bin/ccache arm-marvell-linux-gnueabi-g++
sudo ln -s ../../bin/ccache arm-marvell-linux-gnueabi-cc
sudo ln -s ../../bin/ccache arm-marvell-linux-gnueabi-c++
popd //return pushd . keep current path
3. Put "Ccache" search path into $PATH
export PATH=/usr/lib/ccache:$PATH
4. Keep $PATH always
vi ~/.profile
==>export PATH=/usr/lib/ccache:$PATH
5. Reopen connection and check $PATH
echo $PATH
