[CMake] Help: How to generate one library from multiple directories

[Yang, Y.]

Hi, all.

I just start to use cmake and a newbie. Now I want to generate one
library from multiple directories.
However, when I use add_library(libname, source_file) in each folder;
I found that the latter generated lib file would overwrite the previous
lib file.

How can I link those objects from multiple folder into one lib file.

Thanks forward.

best regards.

Yang