[CMake] Changing PreprocessorDefinitions

[Michael Andronov]

Hi,
Let me explain my question briefly:

1. I'm trying to write the CMakeLists.txt, which will generate a proper
project for Visual Studio .net.
2. Within my CMakeLists.txt, I set the variable:
   SET (COMPILE_FLAGS "/W3 /nologo /c /Wp64 /ZI /Gd /TP ")
3. My expectation is that above variable will be 'translated' into compiler
flags within Visual Studio;
4. However, the actual flags ( PreprocessorDefinitions) contains some
additional options like:
    POSIX,IA32,DEBUG
   And those flags are `killing` me.
5. My questions are:
    - where those `additional`  options are coming from?
    - is there any way to get rid of them/to reconfigure them?

Thank you very much for your kind attention to this matter.
Michael.

P.S> Please, accept my apologies, if the question has been asked and
answered already. I made a search within 'Mastering CMake', and Web,
but failed to find the answer.
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