Apologies for cross posting, this thread seems more relevant to my problem. Xcode 7.3.1 seems to have resurrected the problem. My project worked fine, then broke after a clean with the following errors
/JuceLibraryCode/modules/juce_audio_plugin_client/AU/AUResources.r:89: ### /Applications/Xcode.app/Contents/Developer/usr/bin/Rez - Badly formed expression.
/JuceLibraryCode/modules/juce_audio_plugin_client/juce_audio_plugin_client_AU.r: ### /Applications/Xcode.app/Contents/Developer/usr/bin/Rez - Since errors occurred, /Users/jonathanthorpe/Library/Developer/Xcode/DerivedData/Relay-gznmewrtzrpwuafyzllzfeggfwmv/Build/Intermediates/Relay.build/Debug/Relay (AU).build/ResourceManagerResources/Objects/juce_audio_plugin_client_AU.rsrc's resource fork was not written.
Command /Applications/Xcode.app/Contents/Developer/usr/bin/Rez failed with exit code 2
I detailed my attempts to solve the problem here AUs in Xcode
I think I’ve narrowed it down to an Xcode problem but any advice on solving the problem would be great. Even a quick fix so that I can get back to developing the plugin. Creating an empty plugin from scratch with the last Projucer (both master and commit branches) results in the same error, so this seems like a pretty serious issue. Thanks for any help!