Visual Studio 2017 (version 15.3.3) wrongly diagnosed as MSVC_VERSION = 1900

I am working on Windows 7 and have tried cmake versions 3.9.6 and 3.10.0-rc5, but both have the same problem.

cmake shows this output:

The CXX compiler identification is MSVC 19.11.25507.1
The C compiler identification is MSVC 19.11.25507.1
Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.11.25503/bin/HostX86/x64/cl.exe
Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.11.25503/bin/HostX86/x64/cl.exe -- works
Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.11.25503/bin/HostX86/x64/cl.exe
Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.11.25503/bin/HostX86/x64/cl.exe -- works

... but MSVC_VERSION is set to 1900, which according to https://cmake.org/cmake/help/latest/variable/MSVC_VERSION.html corresponds to VS 14, not 15. This apparently is the reason for the problems reported in #16737 (closed).

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