How to build .so on a C++ cmake project which uses static lib?

[lucasjinreal]

Hi, I have a cmake project which forced output static lib. But I want add a pybind to it.

Now , I got this error on generated .so file:

wnn.cpython-39-darwin.so' (not a mach-o file)

but I have this cmake setting:

pybind11_add_module(pywnn SHARED src/wnn.cc)

I tried use this pybind11 cmake in a standalone project, it works, but in my c++ project using static lib , it was always fail.

How can I resolve it?