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I'm new to iOS development.
I use GCM for chating and push notifications. When I run my iOS app in simulator it never gives me any error but when I run my iOS app on my device(iPad, iOS 8.1, xcode7.1), the build fails and gives an error:

linker command failed with exit code 1 (use -v to see invocation) )

How should I deal with the error?

bohdan_trotsenko
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Ron Gahlot
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    Please post your solution first. What have you tried, what went wrong? – mihai Dec 05 '15 at 09:58
  • Post Your error scrrenshot – Maulik Patel Dec 05 '15 at 10:04
  • i use GCM for push notification in iphone app so i follow " https://developers.google.com/cloud-messaging/ios/client " this and get this error – Ron Gahlot Dec 05 '15 at 11:16
  • it seems that you have added two library of files twice..are you using cocoapods ? what else library did you use – Rahul Dec 05 '15 at 17:32
  • with cocoa pods i use GGLInstanceID (1.1.1): Google/CloudMessaging (1.2.1): Google/Core Google/SignIn GoogleAppUtilities GoogleAuthUtilities GoogleCloudMessaging GoogleInterchangeUtilities GoogleIPhoneUtilities (1.0.0): GoogleSymbolUtilities (~> 1.0) GoogleSignIn GoogleAppUtilities GoogleAuthUtilities GoogleNetworkingUtilities GoogleUtilities – Ron Gahlot Dec 07 '15 at 04:19
  • Please try this: go to the project settings (click on the File Structure icon and then the app name, and then the Tests target), click `Build Settings` and then scroll down until you see `Test Host` (or type ‘host’ in the search box). Then `clear` the contents of both the Debug and Release hosts, circled below. The app should then compile without any issues. For more details please refer to here:http://www.robpercival.co.uk/upgrading-apps-to-xcode-7-linker-command-failed-with-exit-code-1/ – bjiang Dec 07 '15 at 22:01
  • in my xcode there is no contents in both Debug and Release . so what i clear. – Ron Gahlot Dec 08 '15 at 05:35

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