Comments on: Some Clarifications Regarding the iPhone 3.0 OS & SDK

By: Roger Nolan

Roger Nolan — Fri, 27 Mar 2009 06:21:43 +0000

you need to do a binary compare – particularly of the CODE sections but also all the resources etc. to see if the actual code they are producing is the same output, not just if they refer to the SDK. I’d be worried about bug in the compiler etc. You need to be sure that the executable produced by running a 2.2 build in the 3.0 SDK is the same as building a 2.2 build from the 2.2 SDK.

It would be interesting to understand what Apple are changing but, from a SW dev process, again, I’m not sure it’s worth the risk and effort.

By: cbg

cbg — Fri, 27 Mar 2009 00:06:58 +0000

A quick update: manual inspection of the ARM executable produced by Xcode reveals no reference to the 3.0 SDK. There are, however, references to the 2.0 SDK, which I built my application against.

By: cbg

cbg — Thu, 26 Mar 2009 23:25:43 +0000

Actually I don’t, not yet anyway, but it certainly sounds intriguing.

By: Roger Nolan

Roger Nolan — Thu, 26 Mar 2009 23:23:27 +0000

…with the 3.0 beta tools. It’s trivially possible but not worth the risk. In my view anyway – you are of course welcome to – or maybe you know more about the compiler, linker, code signing, PNG compression etc tools in the 3.0 SDK. If you do, that would make a more intersting post to your blog.

By: cbg

cbg — Thu, 26 Mar 2009 21:43:57 +0000

If you pick the 2.x SDK in the project settings, you *should* be building with the 2.x SDK, not 3.0.

By: Roger Nolan

Roger Nolan — Thu, 26 Mar 2009 21:22:48 +0000

Thanks for the comment on SO. I think you’re confusing what is possible and what is wise.

Of course you can build 2.x apps with the 3.0 SDK but, it is a beta dev kit and, Apple explicitly advise you not to do this.

Far safer to heed their advice, install two SDKs and build with a release SDK for release code and a beta SDK for internal testing.