[CMake] CMAKE_BUILD_DIR variable

[Min Cu]

Hi,

I need to use CMAKE_BUILD_DIR variable in my script to create additional 
files in that directory, however the variable is emty. Is there something 
extra I need to set it? I do not know the build directory beforehand, also 
it will vary for different developers. Also, when running make from the 
build directory (different from the directory of the source files) the 
CMAKE_SOURCE_DIR variable contains the address of the build direcory: how do 
I see the address of the direcory of the source files?

Thanks,
Min

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