Cocos new project -e option

Hello everybody,

There is a -e option when creating a new project that documentation refers to it as the engine address. But unfortunately, nobody ever describe this option anywhere !!
(Q1)Can someone please describe how -e could be helpful ?


[Extra Question]
We knew cocos2dx copy whole engine every time we create a new project as a cocos2d folder beside other folders.
(Q2)Can this flag help us to create “multiple project” which all refer to “the same cocos2d library” file in someplace in share?

and if yes, (Q3)Does .sln or .xcodeproject understand to build library once? [I mean after building in one project, if you build other project they see the .dll/.a result and use it instead of compiling the engine]

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