Eidolon's Magic Attack count against Incorporeal Creatures?

[Katelyn Scarlett]

Here's the direct text that I'm using as support:

The eidolon evolution "Magic Attack" makes it "treat all of its natural attacks as if they were magic for the purpose of overcoming damage reduction."

Incorporeal creatures "can be harmed only by other incorporeal creatures, magic weapons or creatures that strike as magic weapons, and spells, spell-like abilities, or supernatural abilities. It is immune to all nonmagical attack forms. Even when hit by spells or magic weapons, it takes only half damage from a corporeal source (except for channel energy). "

Ghost touch weapons: "an incorporeal creature's 50% reduction in damage from corporeal sources does not apply to attacks made against it with ghost touch weapons. (Note the bolded text and how it's not-quite-a-DR)

So incorporeal creatures have something that is functions like having a Damage Reduction, but it isn't considered mechanically as having it.

The "Magic Attack" evolution is only for the purpose of the mechanical DR.

Is there any rules that clear this up, saying that Magic Attack also works on the incorporeal creature's quasi-DR?

[Cheapy]

The intent is for it to work, even though the RAW says otherwise.

[rkyeun]

Being magic for the purpose of damage reduction is the exact meaning of creatures that strike as magic weapons even if it is not the exact wording. Your eidolon has magic claws and can claw magically at ghosts that get clawed by magic.

[DeivonDrago]

You can definitely attack incorporeal creatures with the Magic Attack evolution. It's a great 1-point evolution.

You still deal only half damage.