If you're always compiling the same programs over and over again — such as trying out several kernel patches, or testing your own development — then
ccache is perfect. While it may take a few seconds longer to compile a program the first time with
ccache, subsequent compiles will be much, much faster.
Enable ccache for makepkg
To enable ccache when using makepkg edit
BUILDENV remove exclamation mark before ccache and it will enabled. For example:
BUILDENV=(fakeroot !distcc color ccache !xdelta)
Enable for command line
If you're compiling your code from the command line, and not building packages, then you'll still want to use
ccache to help speed things up.
For that, you need to change your
$PATH to include
ccache's binaries before the path to your compiler.
You may want to add this line to your
~/.bashrc file for regular usage.
Enable with colorgcc
Since colorgcc is also a compiler wrapper, some care needs to be taken to ensure each wrapper is called in the correct sequence.
export PATH="/usr/lib/colorgcc/bin/:$PATH" # As per usual colorgcc installation, leave unchanged (don't add ccache) export CCACHE_PATH="/usr/bin" # Tell ccache to only use compilers here
Then colorgcc needs to be told to call ccache instead of the real compiler. Edit
/etc/colorgcc/colorgccrc and change the
/usr/bin paths to
/usr/lib/ccache/bin for all the compilers in
g++: /usr/lib/ccache/bin/g++ gcc: /usr/lib/ccache/bin/gcc c++: /usr/lib/ccache/bin/g++ cc: /usr/lib/ccache/bin/gcc g77:/usr/bin/g77 f77:/usr/bin/g77 gcj:/usr/bin/gcj
Change the cache directory
You may want to move the cache directory to a faster location than the default "~/.ccache" directory, like a SSD or a ramdisk.
To do change the cache location:
export CCACHE_DIR=/ramdisk/ccache # Tell ccache to use this path to store its cache
You can use the command line utility ccache to...
Show statistics summary:
$ ccache -s
Clear the cache completely:
$ ccache -C