Using ccache ------------ [ccache](http://ccache.samba.org/manual.html) is available in many systems, and can dramatically improve compilation times. In particular if we are constantly switching between different branches. On Ubuntu, we can install ccache by executing sudo apt-get install ccache Then, we can create a simple script that invokes ccache with our favorite C++ 11 compiler. For example, we can create the script `~/bin/ccache-g++` with the following content: #!/bin/sh ccache g++ "$@" Then, we instruct cmake to use `ccache-g++` as our C++ compiler cmake -D CMAKE_BUILD_TYPE=Debug -D CMAKE_CXX_COMPILER=~/bin/ccache-g++ ../../src We usually use Ninja instead of make. Thus, our cmake command line is: cmake -D CMAKE_BUILD_TYPE=Debug -D CMAKE_CXX_COMPILER=~/bin/ccache-g++ -G Ninja ../../src