[Qbs] How to setup: QtC, Qbs, Clang on Windows

[resurrection at centrum.cz]

I have been struggling with setting up Qbs inside Qt Creator so it uses clang-cl on Windows. On the command line it is auto-detected and works just fine. In QtC I need to add manually compilers for C and C++, both set to clang-cl.exe (in c:/program files/llvm/bin). Then I add new Kit and specify these compilers. All seems fine. QtC also adds new profile in Qbs section with data identical to those auto-detected on the command line. So again, seems fine. But it still does not work, the error:
 
warning: Error: TypeError: Result of expression 'qbs.compilerName' [undefined] is not an object.
 
And yet the compilerName is indeed set correctly in the profile. Is it a bug in QtC? Or am I doing something wrong?
 
Thanks!