Safely Reset Xcode from 9.3 to 11.6. Clean, clear module cache, Derived Data and Xcode Caches.

xclean.sh

#!/bin/zsh
############
### zsh script to clear xcode caches and project
###
###      Works from Xcode 9.3 to Xcode 11.6
###
### last date I tested: (7/24/2020)
###
###   Move this script to /usr/bin/local so this will be the default usage:
###      cd myXcodeWorkspace/
###      xclean
###
############

# clean up function
function cleanXcode() {
	setopt nomatch
	pkill -int com.apple.CoreSimulator.CoreSimulatorService
	killall Xcode
	xcrun -k
	xcodebuild -alltargets clean
	rm -rf "$(getconf DARWIN_USER_CACHE_DIR)/org.llvm.clang/ModuleCache"
	rm -rf "$(getconf DARWIN_USER_CACHE_DIR)/org.llvm.clang.$(whoami)/ModuleCache"
	rm -rf ~/Library/Developer/Xcode/DerivedData/*
	rm -rf ~/Library/Caches/com.apple.dt.Xcode/*
	xed "$TARGET" .
}

# ensures that you are inside a Xcode folder
function ensureFolder() {
	local workspace project return variable=$1

	workspace=(*.xcworkspace)
	project=(*.xcodeproj)

	if [ -e "${workspace}" ] || [ -e "${project}" ]; then
		return=true
	else
		return=false
	fi

	eval $variable="'$return'"
}

# script main entry point
unsetopt nomatch

ensureFolder contains_xcode_project

if $contains_xcode_project; then
	echo "✓ Cleaning Xcode..."
	cleanXcode
else
	echo "⨯ Xcode workspace or project not found"
fi

Hi Arthur
When I run xclean.sh, i get this message : xCode workspace or projet not found
Can you help me ?
Pascal

Great! Worked for me

Hi Arthur
When I run xclean.sh, i get this message : xCode workspace or projet not found
Can you help me ?
Pascal

The script is pretty self explanatory. I made it to work with zsh (shell), if you want to use safely with other shell, you need to change the firstline of the script. But if you have zsh installed it should run just fine.

After that, just make sure that you are indeed inside a folder which contains a workspace or a xcodeproject (or both) and run the command