[CMake] Why prefer ADD_SUBDIRECTORY to SUBDIRS ?

[John Biddiscombe]

I;m sure you'll get a better answer ...but as I recall, ADD_SUBDIRECTORY 
processes the subdir at the time it is called, whereas SUBDIRS pushes 
the dirs onto a list which is processed at the end of the current 
cmakelists file - this is the old behaviour and some vars are 
initialized 'out of order'  -or at least in unexpected order

JB

> The online help says that we should use ADD_SUBDIRECTORY rather than
> SUBDIRS, but that SUBDIRS still works.
>
> Does anyone know why we're supposed to prefer ADD_SUBDIRECTORY?
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-- 
John Biddiscombe,                            email:biddisco @ cscs.ch
http://www.cscs.ch/about/BJohn.php
CSCS, Swiss National Supercomputing Centre  | Tel:  +41 (91) 610.82.07
Via Cantonale, 6928 Manno, Switzerland      | Fax:  +41 (91) 610.82.82