NiosIIIDE : Multiple projects dependencies

Hi,

I've got 2 Managed projects in NiosIIIDE 5.1 with one System library : Project1 and Project2.

Project2 depends on Project1 Object files.

How can I managed from IDE this dependancies as Makefiles are generated ?

I would like to use something like :

nios2-elf-gcc -O2 -o <project2.o> <project1_1.o> <project1_2.o>

But from the IDE , there is nothing to add All Project1 object files to Project2, even using builders....

Thanks in advance