compile multiple files from different location into one folder

[shenc]

I have a project with multiple files from different locations.  I add them to this project.  I want to build those object files into one folder called ./obj and link them.
Say I have those files in folders

/home/me/A1/A2/a2.cpp
/home/me/A1/A3/a3.cpp

/home/me/B1/B2/b2.cpp
/home/me/B1/B3/b3.cpp

CB project in
/home/me/prj/ab.cbp

I want all objects build into folder  (define objects output dir:  obj/  in project properties)
/home/me/prj/obj

By default, CB build those source files and output them to

./obj/A1/A2/a2.o
./obj/A1/A3/a3.o
./obj/B1/B2/b2.o
./obj/B1/B2/b3.o

This is not I wanted.  Since ./obj do not have those folder tree .
Any suggestion?
Thanks

[oBFusCATed]

Why do you care? C::B does this to prevent multiple files from different folders that are named the same to generate the same object file and thus prevents hard to debug issues.

[shenc]

Because other team member needs this.  Anyway, I find the solution.  In advance setting use flat option.

[oBFusCATed]

Why would they need this? I'm curious.