[CMake] force c++

[Jan Woetzel]

Axel Roebel wrote:

>does anybody know how I may force the use of a c++ compiler
>for source files with .c extension?
>  
>
I think we worked around taht problem:
If one file has cpp suffix all files are compiled as C++ instead of C.
Thsu we added a dummy file per library.

Please correct me if I'm wrong.

Jan.

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  Dipl.-Ing. Jan Woetzel
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