Choosing vc++ setup for 14.1

In my user_config.jam I have for msvc-14.1:

using msvc : 14.1 ;
using msvc : 14.1c14 : : <cxxflags>"/std:c++14" ;
using msvc : 14.1c17 : : <cxxflags>"/std:c++latest" ;

If I invoke b2 with "toolset=msvc-14.1" the msvc-setup.bat shows:

REM "C:\Program Files (x86)\Microsoft Visual 
Studio\2017\Community\VC\Auxiliary\Build\vcvars32.bat"
SET CommandPromptType=Native
SET DevEnvDir=C:\Program Files (x86)\Microsoft Visual 
Studio\2017\Community\Common7\IDE\

among many other lines, which is certainly correct for vc++ 14.1. But if 
I invoke b2 with "toolset=msvc-14.1c14" or "toolset=msvc-14.1c17" the 
msvc-setup.bat shows:

REM "C:\Program Files (x86)\Microsoft Visual Studio 
14.0\VC\vcvarsall.bat" x86
SET DevEnvDir=C:\Program Files (x86)\Microsoft Visual Studio 
14.0\Common7\IDE\

which is the setup for msvc-14.0 and not msvc-14.1.

Is this a known bug or is my usage of the msvc toolset incorrect ? I am 
able to use the pattern above to invoke other toolsets ( gcc, clang, 
intel ) with different cxxflags.








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