QT + QBS + Bare Metal, debug information

I'm using cortex m0 microcontroller with QT QBS + bare metal + gdb + openocd + stlink(debugger). I want to print into qt-terminal debug information. How Can I do this feature?

forexample:

int main()
{
    printf("Hello World!");   // On this string application must to output "Hello World" into the terminal.
}

Can anyone help?