Is Apple LLVM 6 compatible with LDC

[JJDuck via Digitalmars-d-learn]

I'm trying to compile my D code using LDC and hopefully used by 
my iOS program in Xcode.

So I did some research
(correct me if I'm wrong)
If I compile my D code using LDC into static file and used by my 
iOS app and since they have the same compiler backend, are they 
binary compatible?

If it is binary compatible, should I still build some C header 
file so it can be called by iOS?

XCode's compiler seems to keep evolving into their next stage, so 
I'm not sure if I'm conceptually correct.

THanks