Recursive dependencies

[Rodrigo de Salvo Braz]

Hi,

Suppose I have a Makefile for project A which calls a recursive make for 
project B.

I want to *always* run the Makefile for B, so its dependencies are 
checked and B is remade when necessary. This suggests a phony target for 
it:

A: B
        <commands for making A>

.PHONY: B
B:
        $(MAKE) -C bdir

But then A is always remade regardless of B having changed or not.

Could someone please suggest a solution to this problem? Please note I am 
not subscribed to the list, so please cc me.

Thanks,

Rodrigo