http://blog.csdn.net/eqiang8271/article/details/17144411
上接 Android分布式编译学习（一）—— Ubuntu12.04上部署distcc分布式编译，我们已经部署了distcc 3台PC进行编译。
二, 介绍 Setting up ccache
google 有介绍：
http://source.android.com/source/initializing.html#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 frequentlyswitch between different build products.
Put the following in your .bashrc or equivalent.
export USE_CCACHE=1
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.
export CCACHE_DIR=<path-to-your-cache-directory>
The suggested cache size is 50-100GB.You will need to run the following command once you have downloadedthe source code:
prebuilts/misc/linux-x86/ccache/ccache -M 50G
When building Ice Cream Sandwich (4.0.x) or older, ccache is ina different location:
prebuilt/linux-x86/ccache/ccache -M 50G
This setting is stored in the CCACHE_DIR and is persistent.
设置完，接口进行build 来比较了，看看效率提高了多少。