[Cmake] camke 1.8.0 + out of source build + cache

[Jan Woetzel]

Hi,

with cmake 1.8.0 there seems to be a problem with out of source builds 
(source dir != build dir).
If there is already a cache file in source directory,
then nothing is generated in build directory.

Jan.

-- 

  Dipl.-Ing. Jan Woetzel
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  University of Kiel
  Institute of Computer Science and Applied Mathematics
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  24098 Kiel/Germany
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