interface and implementation

I have a question about implementation and interface. If i want only to get the interface from a module which has an implementation module, how must I do to get also the symbol init_XXXXX??

example : ---------------------------------------------- module a interface;

export a =all; type string80 = string(80); procedure p; end.

module a implementation; procedure p; ...... ...... end.

module b interface; export b =all; import a; end.

module b impleementation; .... end.

I just want to get the type definition without the implementation of module a. In the b.o file, init_A symbol appears. -------------------------------------------------

Actually, I compile my modules in 2 steps. The first one is with --interface-only to get gpi file. Then, I compile my module with --implementation-only. Sometimes, I only need the interface files. But, importing a module always adds the init_XXX symbol. So what is the solution?