The warnings appear on XCode using XCODE_ATTRIBUTE_GCC_WARN_ABOUT_MISSING_PROTOTYPES "YES" and seem to be introduced by iOS: Enable support for layered/async drawing · juce-framework/JUCE@bad031a · GitHub.
Thanks for reporting. We’ve pushed some fixes and squashed the warnings in a few places so it shouldn’t flag up in the code now. These changes are on the develop branch:
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Thank you!
