I got this warning when I added share extension to my project and archiving it
warning: skipping copy phase strip, binary is code signed: /Users/xxxx/xxx/xxxx/
If you are using Xcode 9.34.1, click in the project settings. Use the filter to find the correct setting: type "strip debug". You will find the settings COPY_PHASE_STRIP. Probably is set to "Yes". Set to "No" to remove the warning.