[cmake-developers] The MSVC** version variables

[Rolf Eike Beer]

I was looking at http://www.cmake.org/Wiki/CMake_Useful_Variables and while 
scanning through it I once again saw how many variables we have for the 
different MSVC versions. Since it's unlikely that MSVC11 is the last (the 
variable is currently missing, but I'll fix that soon) I thought if it 
wouldn't be enough to just introduce a MSVC_VERSION variable. Setting this to 
6.0 or 7.1 or 11 is easy, and checking it is easy since we have VERSION_LESS 
and friends. Checking for something like "MSVC >= 9.0" is currently a pain if 
one does not want to fall back to the CL_VERSION, which is not obvious as 
those versions are of a totally different range and one must always comment on 
what is checked there.

Patch for this should be trivial. Any opinions?

Eike
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