Hi, I have a project where I notice that without any changes, when I do a do a second build, there are certain files keep being rebuilt. Only when I do a third build (again without any changes) does Xcode finally recognize nothing needs to rebuild. Are there any debug flags I can turn on to get Xcode tell me what makes it decides to rebuild a file?

I recently updated my xcode to latest version 12.2. According to the doc I should be able to see 64 bit arm selection in the architectures list. But I don't see that. Am I missing something?