[oe] How do I build and SDK?

[Chris Tapp]

I've had a look at the OE manual to try and understand what's needed  
to build an SDK, but I'm still not sure what I need to do.

I can 'bitbake my-image', giving me a system that boots ok on my target.

What I want to do now is produce an SDK that allows binaries to be  
built under an x86 hosted linux distro (e.g. ubuntu).

I'm not sure why there is a host and target to configure - I was  
expecting just to configure something for the platform that will run  
the SDK - I was thinking that the current OE local.conf should give  
the information needed to do this.

Is there an easy way to take a system configured to build 'my-image'  
and produce an SDK from that? I'm running OE under Ubuntu, if that  
makes things easier.

Failing that, are there any examples I can look at that would give me  
a more information that what's in the documentation?

Thanks !

Chris