Build errors after switch to ARC

After converting my project to ARC I get build errors in AppCode whereas the project builds fine in the latest XCode. I've submitted a bug (#1415, http://youtrack.jetbrains.net/issue/OC-1415 ) but that hasn't been processed yet.
I've switched back to XCode but my brain is starting to suffer very badly.
What can be said in general about this ? Isn't AppCode using the exact same compiler/linker and -settings as XCode ?

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