[CMake] A way to set default compiler, etc.?

[Dave Abrahams]

When I invoke cmake for the first time in a project, I normally use

     -DCMAKE_C_COMPILER=clang -DCMAKE_CXX_COMPILER=clang++

I'm tired of typing that every time I blow away my CMakeCache.txt.  Is
there a place I can register these preferences so I don't have to?

Thanks,

-- 
Dave Abrahams
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