我应该如何检测大型C ++项目中编译时间的瓶颈？

I want to reduce compile time of a large C++ project. I tried to use precompiled headers, interface and etc. But before I move on, I want to know whether any tool which helps detect why compile time is so long. Somebody suggests pc-lint and I will give a shot. I want to reduce compile time of a large C++ pr