[CMake] library name from subdirectory and setting the CACHE - a "listening" variable?

[Alexander Neundorf]

On Thursday 29 July 2010, Eric Noulard wrote:
> 2010/7/29 Clifford Yapp <cliffyapp at gmail.com>:
> > Got it - was using a VTK macro for third_party inclusion that was
> > using SUBDIRS - switching it to ADD_DIRECTORY got me going.  Awesome!
>
> SUBDIRS is deprecated but it's good to know that it's behavior
> is not strictly equivalent to  ADD_DIRECTORY in some case.

SUBDIRS() are processed after the rest of the CMakeLists.txt has been 
processed, ADD_SUBDIRECTORY() is processed immediately.

Alex