[CMake] canonical way to distinguish CMake builds?

[Brandon J. Van Every]

I have put ADD_DEFINITIONS(-DCMAKE_BUILD) in CMakeLists.txt and 
statements such as #if !defined(CMAKE_BUILD) in my .h files.  Is there a 
canonical definition for this?  I didn't see any canonical flag being 
passed to the C compiler, so I'm guessing there isn't one, but I have a 
vague memory of reading about such a thing in the archives.  Couldn't 
find any reference to it though.


Cheers,
Brandon Van Every