[CMake] setting defines using CMAKE_CXX_FLAGS

[Jesse Corrington]

I am using CMAKE_CXX_FLAGS to set defines because I want to be able to set
different ones for debug and release using CMAKE_CXX_FLAGS_DEBUG/RELEASE,
which the other add define command doesn't seem to support. What I am doing
doesn't seem to be working. Here is what I have:

SET( CMAKE_CXX_FLAGS
    -D DEF1
    -D DEF2
    -D DEF3
    -D DEF4

when I open the visual studio 2005 project file and look under the
preprocessor setting I see the defines like this:

";_WANT_MEMPOOL_OPTIMIZATION;-D;_HAS_NETWORK;-D;_WATCH_FILESYTEM;-D;_CRT_SECURE_NO_DEPRECATE;-D;USE_PCH"

How can I make this work correctly.
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