How to build a static library in the before-all step?

[Yikai-Liao]

Now, the cmake list in my project looks like this. I want to build the static library first (which can be reused for building wheels on the same platform with different python version) to accelerate the whole buiding process.

add_library(symusic ${symusic_src})  # python independent part

python_add_library(core MODULE py_src/core.cpp WITH_SOABI)
target_link_libraries(core PRIVATE pybind11::headers)
target_link_libraries(core PRIVATE symusic)

I have read the document and found the CIBW_BEFORE_ALL option.
But still don't understand what I need to do, to copy all the pre build static lib to the correct path.