[CMake] out of source command line flag

[Hendrik Sattler]

Am Samstag 05 September 2009 16:59:09 schrieb Bill Hoffman:
> I use this all the time, and so do lots of people that I know. They do
>  this:
> 
> cmake .

I also use this. But being able to force a specific build dir (instead of cmake 
trying to be smart) may be a good thing, like ignoring the in-source build 
files.
It may cause other problem though, like "-I<source-dir> -I<build-dir>" and a 
generated header file.

HS