I received an email just now from another David, saying "I haven’t found this information on your website…The question is: Will the latest Xcode (6.3.2) work with Delphi XE8 Update 1?". I have installed RAD Studio XE8 Subscription Update 1, installed the updated PAServer on my Mac to match the IDE, and I have Xcode version 6.3.2 running on my Mac. I am running iOS 8.3 on my iPhone 6 and iPad Air 2. To answer David (I also replied to his email): All is good with my development, testing and deployment of iOS and OSX apps.
Here are the screen grabs of my about boxes for both tools:
My guidance to developers is always, when you learn that there is a platform update, stay tuned to our blogs and wait until you hear from us that it is safe to go in the water before installing updates to the underlying platforms and devices we are using and targeting. We give general platform version guidance at "Supported Target Platforms" pages (and links to specific target platforms) at http://docwiki.embarcadero.com/RADStudio/XE8/en/Supported_Target_Platforms.
I will work with our team to create a single spot where we can always update the version number dependencies and support we have, especially given that the platform vendors are making impactful changes these days even in what would normally be considered minor updates. Stay tuned for a permanent URL.