Ccache is a compiler cache used to speed up recompilation by caching previous compilations. see the website of ccache for more informations.

To install Ccache, use the following steps:

1. Install package

sudo apt install -y ccache

2. Update symlinks

sudo /usr/sbin/update-ccache-symlinks

3. Prepend ccache into the PATH

echo 'export PATH="/usr/lib/ccache:$PATH"' | tee -a ~/.bashrc

4. Source bashrc to test the new PATH

source ~/.bashrc && echo $PATH

The message on terminal should look like this:

''/usr/lib/ccache:/usr/local/cuda-5.5/bin/:/usr/lib/lightdm/lightdm:/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/game
''

5. Test g++/gcc. By typing

which g++ gcc

will return the message

''/usr/lib/ccache/g++
/usr/lib/ccache/gcc''