qtuiohandler.cpp fail to compile under simplified chinese windows 10

Now I fail to compile src/plugins/generic/tuiotouch/qtuiohandler.cpp under simplified chinese Windows 10, This is caused by the following line:

    qCDebug(lcTuioSet) << "Processing SET for token " << classId << id << " @ " << x << y << "∡" << angle <<
                          "vel" << vx << vy << angularVelocity << "acc" << acceleration << angularAcceleration;

There is a character '∡' in this line which is not a latin-1 character but it is a valid utf-8 character. But under simplified chinese windows 10, the default character-set is GBK, the compiler will assume GBK source code which cause the compile error.