[CMake] Coverage tests with gcov under Linux

[Bill Hoffman]

Judicaël Bedouet wrote:
> It perfectly works with CVS CMake. Thanks.
> Will this commit be integrated in CMake 2.6 or is it too late ?
> Thanks again,
> J. Bedouet
> 
It will be in 2.6.1.  Should be out in weeks not months. Thanks for 
testing this.

-Bill