MSVC_TOOLSET_VERSION
--------------------

The toolset version of Microsoft Visual C/C++ being used if any.
If MSVC-like is being used, this variable is set based on the version
of the compiler as given by the :variable:`MSVC_VERSION` variable.

Known toolset version numbers are::

  80        = VS 2005 (8.0)
  90        = VS 2008 (9.0)
  100       = VS 2010 (10.0)
  110       = VS 2012 (11.0)
  120       = VS 2013 (12.0)
  140       = VS 2015 (14.0)
  141       = VS 2017 (15.0)

Compiler versions newer than those known to CMake will be reported
as the latest known toolset version.

See also the :variable:`MSVC_VERSION` variable.