is there a way to do call tree using conditional compiles?

[sdetweil]

I am working on a firmware module that is quite complex, trying to add some function
and a call tree would help me understand the current codebase better..

but there are #ifdef in the source, so some paths are not processed..(the ones I want of coruse!)

unrelated, I am on linux, and graphviz is installed, but I don't see any executable, or a way to draw the graphics from the dot file.

this is C/C++