How to get a makefile include graph with make?

[Peng Yu]

Hi,

Suppose I have the following Makefiles.

Makefile_leaf1, Makefile_node1, Makefile_node2, Makefile_node3

Makefile_leaf1 is included by Makefile_node1 and Makefile_node2. Both
Makefile_node1 and Makefile_node2 are included by Makefile_node3.

Is there an automatically way to know that Makefile_leaf1is included
Makefile_node3.

The general question is how to figure out the leaf makefiles that are
either directly or indirectly included in a makefiles. Here, a leaf
makefile is a makefile that does not include other makefiles.

Thanks,
Peng