lean2/doc/make/ccache.md

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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