Convert shared library to static library?

Question

Is it possible to convert a shared library (someLib.so) to a static library? (someLib.a)

Answer 1

YES if you have the source code of the shared library.

NO if you don't have the source code of the shared library.

Answer 2

No. (At least for ELF shared library). A shared library is a simple object (so stands for shared object). A static library is a collection of objects. In the process of building the shared library you combine several objects and you lose some of the information which would be needed to retrieve them.