build a project

[Qian Xu]

Hi All,

I have a project with 300 d-files. I use WAF-tool to build my project. 

If I add one line comment in a d-file from the bottom of the dependency
tree, almost the whole project will be recompiled again. This is very time
consuming.

Is there any way to detect, whether the modification of a d-file does not
have affect to its dependency?

Best regards and have a good day
--Qian Xu