I opened one of my existing projects after upgrading and can no longer compile. Below is a screenshot of the type of warnings I get. What is this related to?

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I finally got it to compile. As I suspected, the problem was buried in one of the “Build Settings”, which I’m not too proficient in. Thankfully I had another project to compare with.
For some reason my “Framework Search Paths” were populated with some system paths. Once I cleared those, everything compiled!