Cannot use Clang as C++ compiler

I installed Clang7 on Ubuntu 18.10, which QtCreator automatically picked up at /usr/bin/clang+-7, and set it as the C/C+ compiler in the Qt Kit configuration.

However, instead of using the selected compiler (/usr/bin/clang+-7), qmake tries to call the global command "clang+". So apparently the selected compiler information isn't forwarded from QtCreator to QMake.

I can make it work by symlinking /usr/bin/clang+7 to clang+, but that of course defeats the purpose of being able to select different compilers in QtCreator.