What is the current state of the C-Api?

[Empire-Phoenix]

Well after googleing and finding mostly really outdated information, I wanted to ask, what the current status of the C-Api in bullet is.

I'm mostly intrested in

Primitive Shapes
Compoundshape
(none moving) triangleshapes (though gimpact shapes would be nice)
and the vehicle constraint.

Thanks for reading and hopefully answering

[razer]

It is unlikely that bullet would be ported to C. I do not think someone really need that.