Can't create in6_addr

[Yamakaky]

There is a private __align field, so we can't create it.
https://doc.rust-lang.org/libc/x86_64-unknown-linux-gnu/libc/struct.in6_addr.html

[alexcrichton]

Thanks for the report! This has also been reported here and here, and unfortunately this is just a place where Rust hasn't historically handled FFI unions very well right now. The underlying type is a union which gains it higher alignment but the exposed fields right now don't give us that alignment. When we have custom alignment we may be able to get around this via other means, but for now you can construct this like you would in C:

let mut foo: libc::in6_addr = mem::uninitialized();
// initialize foo.s6_addr
return foo

Which is to say it's not necessarily "impossible", just not very idiomatic!

[Yamakaky]

Oh, OK. Maybe add it in the doc? You could also add a method for that.

[alexcrichton]

Perhaps some general documentation, yes, but I don't think it's particularly necessary to document each and every structure in libc