Choosing clang toolset on Windows

If I have on Windows in my user-config.jam

import toolset ;
using clang-win : 8.0 : E:/programming/bat/cp_clangwin80.bat : etc. ;
using clang : 8.0 : E:/programming/bat/cp_clang80.bat : etc. ;

and my invoocation is:

b2 toolset=clang-8.0 somejam.jam

the clang-win toolset is chosen to compile/link the tests in somejam.jam 
instead of the clang toolset. I realize I can solve this by changing the 
clang toolset to clang-linux, and then invoking b2 as:

b2 toolset=clang-linux-8.0 somejam.jam

but why should I have to do this ?

If I just have in my user-config.jam

import toolset ;
using clang : 8.0 : E:/programming/bat/cp_clang80.bat : etc. ;

then

b2 toolset=clang-8.0 somejam.jam

does use the toolset I have.


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