Setting up ccache
You can optionally tell the build to use the ccache compilation tool. Ccache acts as a compiler cache that can be used to speed-up rebuilds. This works very well if you do "make clean" often, or if you frequently switch between different build products.
Put the following in your .bashrc or equivalent.
By default the cache will be stored in ~/.ccache. If your home directory is on NFS or some other non-local filesystem, you will want to specify the directory in your .bashrc as well.
The suggested cache size is 50-100GB. You will need to run the following command once you have downloaded the source code:
prebuilts/misc/linux-x86/ccache/ccache -M 50G
you can use following command to monitoe ccache ststus: