Disable qDebug output

[the_bis]

I have put into my code a lot of strings like this:

qDebug ( "My value is: %s\n", Value.ascii() );

qDebug ( "My value is: %s\n", Value.ascii() );

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I'd like to view this messages only if I compile my application with debug enabled but I see it with any project configuration.
My ".pro" file contains now:

CONFIG  += qt warn_off release

CONFIG  += qt warn_off release

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How con I get rid of qDebug messages in my compiled QT application?

Thanks,
the_bis