[CMake] Force rebuild

[Bill Hoffman]

Philip Lowman wrote:
> Min Cu wrote:
>> I have a project which needs to be rebuild every time make is called 
>> (whether the project has changed or not). How do I do it?
>
> One simple approach would simply be to remove CMakeCache.txt, run 
> cmake from scratch and then type make.
>
That will not cause everything to re-build.
> There's probably a better way though.
>
Well, I suppose you could do something like this.....  

Write a program that generates a header file that all files in your 
project include.   Then create a custom target that creates the header 
file, and have all other targets depend on that custom target.  Then 
make the custom target run ever build and have it always generate the 
header file.

-Bill