Created attachment 109119 [details]
screenshot

#include <QtCore/QCoreApplication>

int main(int argc, char *argv[])
{
    int i;
    QString s("Test");
    s = QString::fromLocal8Bit("Привет");
    i = 5;
    i = i + 3;
    s = QString::fromLocal8Bit("Привет");
}

gdb script

define print_qstring
    printf "(QString)0x%x (length=%i): \"",&$arg0,$arg0.d->size
    set $i=0
    while $i < $arg0.d->size
        set $c=$arg0.d->data[$i++]
        printf "%c", (char)$c
    end
    printf "\"\n"
end

Output to debuger console: No command for record ^done