Which inspector are you referring to, @gerald?
In Xcode, if you type ⌘ 8 the Report navigator should display the most recent Build and Debug logs. Select the build log and look for the Link step for the application target. If there are duplicate symbol issues warnings will appear there where mine is currently showing green (success) for an app I’m working on:
You might also see such warnings under and dependency targets, which would show nearer the top of the Build log.