Well, if you have 2013 installed as well as 2015, and if you don't let 2015 try to upgrade the project when it complains, you can keep CMake and everything else the same and VS2015 will build the solution using 2013's compiler. Everything hunky dory.
An extra 8 gigs used up on my drive is a small price to pay to be able to stick to one IDE for all my projects.
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