如何使用ccache加快编译

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Installation :

sudo apt-get install -y ccache

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

Your path (at least the beginning) should look like:

/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/games

And g++/gcc should now point to:

which g++ gcc/usr/lib/ccache/g++/usr/lib/ccache/gcc

Configuration :

If you want no no limit to number of files and size of the cache:

ccache -F 0 && ccache -M 0

Show cache statistics:

ccache -s

Empty the cache and reset the stats:

ccache -C -z

Usage :

Everytime you call gcc or g++; ccache is called.My mistake was that I didn't delete already compiled files. Just delete all your cmake/output files and configure/compile again.

Your ccache shouldn't be empty then. Now try a make clean and make and you'll see it is much faster than re-compiling everything thanks to the cache.

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