How to build libcocos2d.so in Cocos2dx-3.0?

cocos2d-x C++
#1 
 In cocos2dx 3.0, every project must build cocos2d library one time. I want to build a libcocos2d.so, So every project can use it. But the method cocos_android_app_init(...) must be implement in the project which used by cocos2d library.
 How to change the cocos2d code to build libcocos2d.so? Thanks.
#2

Now there is not way to do it as you like. It needs a way to start application.

#3

Thanks very much. Has any methods to reduce the compile time in many project?

#4

Can pass -j x, x is the cpu cores.