Xcode – warning build: Run script build phase 'Module' will be run during every build because it does not specify any outputs. To address this warning

If you are using CocoaPods, your warnings are mostly coming from it. I came up with 2 temporary solutions for this, by modifying the Podfile. A permanent solution would require fixing the issue directly in CocoaPods itself. For custom run scripts that are not generated by CocoaPods, simply uncheck the "Based on dependency analysis" to indicate to Xcode that you intentionally don’t have input/output files to determine whether this script should be run or not.

Both set the always_out_of_date (aka "Based on dependency analysis") flag to true ("1") when needed, on any given project <=> target pair.

Solution A: Do this all in the post_integrate hook

Pros: single block, compact solution

Cons: less performant than Solution B when running pod install, but it’s not perceptible, honestly.

# Fix Xcode 14 warnings like:
# warning: Run script build phase '[CP] Copy XCFrameworks' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase. (in target 'ATargetNameHere' from project 'YourProjectName')
# Ref.: https://github.com/CocoaPods/CocoaPods/issues/11444
post_integrate do |installer|
  main_project = installer.aggregate_targets[0].user_project
  pods_project = installer.pods_project
  targets = main_project.targets + pods_project.targets
  targets.each do |target|
    run_script_build_phases = target.build_phases.filter { |phase| phase.is_a?(Xcodeproj::Project::Object::PBXShellScriptBuildPhase) }
    cocoapods_run_script_build_phases = run_script_build_phases.filter { |phase| phase.name.start_with?("[CP]") }
    cocoapods_run_script_build_phases.each do |run_script|
      next unless (run_script.input_paths || []).empty? && (run_script.output_paths || []).empty?
      run_script.always_out_of_date = "1"
    end
  end
  main_project.save
  pods_project.save
end

Solution B: Same as A, except modify the pods_project within the post_install hook, for a slightly better performance

Pros: technically more performant than Solution A because it saves one expensive call to xcodeproj.save

Con: the solution is more scattered throughout your Podfile.

# Fix Xcode 14 warnings like:
# warning: Run script build phase '[CP] Copy XCFrameworks' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase. (in target 'ATargetNameHere' from project 'YourProjectName')
# Ref.: https://github.com/CocoaPods/CocoaPods/issues/11444
def set_run_script_to_always_run_when_no_input_or_output_files_exist(project:)
  project.targets.each do |target|
    run_script_build_phases = target.build_phases.filter { |phase| phase.is_a?(Xcodeproj::Project::Object::PBXShellScriptBuildPhase) }
    cocoapods_run_script_build_phases = run_script_build_phases.filter { |phase| phase.name.start_with?("[CP]") }
    cocoapods_run_script_build_phases.each do |run_script|
      next unless (run_script.input_paths || []).empty? && (run_script.output_paths || []).empty?
      run_script.always_out_of_date = "1"
    end
  end
  project.save
end

post_integrate do |installer|
  main_project = installer.aggregate_targets[0].user_project
  set_run_script_to_always_run_when_no_input_or_output_files_exist(project: main_project)
end

post_install do |installer|
  installer.pods_project.targets.each do |target|
    # Projects usually do stuff in here…
  end
  set_run_script_to_always_run_when_no_input_or_output_files_exist(project: installer.pods_project)
end

After running pod install, commit the changes made to your main xcodeproj if your xcodeproj file is stored in git.