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Boost Build has a feature which allows the programmer to test at build time what C++ features are supported for a particular compiler implementation and compile parameters, and change the build internally on-the-fly accordingly. I do not know if any Boost non-header only library uses this feature but if one does it will be difficult translating this to CMake terms, if such a similar feature exists in CMake.
CMake has supported this for years, it is not a blocking issue. -- "The Direct3D Graphics Pipeline" free book http://tinyurl.com/d3d-pipeline The Terminals Wiki http://terminals-wiki.org The Computer Graphics Museum http://ComputerGraphicsMuseum.org Legalize Adulthood! (my blog) http://LegalizeAdulthood.wordpress.com