On Aug 12, 2013, at 12:31 PM, Graham Cox <graham....@bigpond.com> wrote:

> XCode then refuses to build because the header file mod date no longer 
> matches what was used when the precompiled headers were built.

Really?! Precompiled headers are automatically regenerated if any of the 
headers have been touched. There shouldn’t be any error. What’s the exact error?

> Rebuild the precompiled headers? Probably a fair option, but it's not obvious 
> how one even does that these days, assuming it's still possible (help?).

Just clean the target and rebuild.

> Given that the SDK is embedded in the app, why on earth is it even allowed to 
> overwrite a file there? Why do the permissions allow writing? Mysteries, 
> mysteries…

Mysteries you should probably be pondering on the xcode-users mailing list, not 
here.

—Jens

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