is there a way to create a DLL without use __declspec dllexport at each functions ?

[Igor Vartanov]

First of all you need to know what functions really require to be exported, and later export only those ones required to be exposed at application level.

Do you know anything about libraries? The fact that function is implemented in the library never means it is directly called by application. The same is applicable to dlls.

And no, I'm not aware of a tool that would let you automate your task.