cmake generate library

[vertextao]

hello, everybody:

I meet a problem when using cmake.

I'm using cmake building my project now, it will output many small libraries like:
libaaa.a, libbbb.a, libccc.a ...

but I want finally to generate a larger library that statically linked to the small ones. I can't find a way to do this.
do you have any good idea?

thanks for your sharing!