How Come a bullet breaks the sound barrier when it does not produce any sound

As you know sound barrier is created when any object move faster that the sound wave it produce.
But when an object moves without making any sound how the sound barrier is created?
or
the bullet does make sound while travelling? or sound is not required for making sound barrier?

Actually, the definition of "breaking the sound barrier" is better stated as "motion faster than the speed of sound in the media".

The crack of a bullet is it breaking the sound barrier.

Do you know the first manmade object to break the sound barrier? It is the bullwhip. The crack it makes is due to the tip of the whip breaking the sound barrier.

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Objects do not make 'sound barriers'. The sound barrier is a term which refers to the difficulty of getting airplanes to fly faster than sound. Wave drag increases dramatically, making it difficult to accelerate the airplane.

Objects make shock waves. As long as the object is supersonic (traveling through the air faster than sound travels through air), it is constantly creating a shock wave, which trails behind it. As the shock wave passes your ear, you perceive it as a boom or a crack. All supersonic bullets (such as many rifle bullets) create shock waves, until they slow down to drop to a subsonic velocity.

Supersonic bullets do create a sonic boom that is usually said to be a "Crack!!". Small object like a bullet does not make a large sonic wave===> We cannot call the sound a "boom."