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Xcode iig hangs. In the best case, the project will be in error - and Xcode cannot recover. To recover restarting Xcode may not help (force quit Xcode) - most of the time a restart of the Mac is required. Its speaks to software quality when "Clean build folder" is your best friend.
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Xcode iig hangs, and while its only using two of my MacStudio's 10 cores - the whole mac hangs (Activity monitor confirms, if it opens at all). If you are not quick enough to reboot the Mac will hang and require power down using power button. Don't use Finder to reboot because Finder hangs too and will not reboot - use terminal (sudo shutdown -r now).
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see screen dump below: super useful!
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After restart, Xode may refuse to launch. This is something I notice with my Java apps (jar launcher): If the app ends with an exit code (1, not 0 like normally) - it will not launch until I restart the Mac, in the meantime must launch the app from Eclipse.
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After restart, the crash reporter comes up - asking me to type a reason. When I type "iig" the auto-correct will change that to "big". This is so totally useful!
MacOS 26.4.1 Xcode 26.3
apologies - its a lousy day when your Mac hangs and requires a restart - repeatedly; until I got my iig fixed up and Xcode fully aware with the actual content. iig error reporting is lousy; which makes fixing so extra hard.