[CMake] dependencies in depend.make

[Bill Hoffman]

Daniel wrote:
> One thing I have noticed while trying to improve the speed of my builds 
> is that the depends.make file for a project is fairly large (15MB) and 
> that most of that size is dependencies against libraries I am using, 
> mostly Boost and Qt.
> 
> It is fairly safe to assume that I won't be modifying these libraries, 
> would removing these dependencies speed up my builds, and if so is there 
> a way to tell cmake not to bother checking to see if certain directories 
> have changed?


You can use INCLUDE_REGULAR_EXPRESSION directory property.  You will 
need to come up with a regular expression that excludes Qt and Boost, 
but keeps your stuff.

-Bill