ionic app build fails with error 'linker command failed with exit code 1 (use -v to see invocation)'

The Xcode error linker command failed with exit code 1 (use -v to see invocation) led me to this stack overflow answer

The second answer there suggests a check for multiple / duplicate .m files in the Xcode project Compile Resources:

That can happen if the same .m file is referenced multiple times in your target's "Compile Sources" section in "Build Phases". Remove duplicate entries and you should be fine.

So I had a check in Xcode and there was indeed a duplicate call to a plugin resource.

After checking package.json I found the same plugin was referenced in two ways (with two paths).

Removing one of the two plugins resolved the issue.

I found the solution on github

the solution for me was open the .xcworkspace file insted of .xcodeproj located inside my '/platforms/ios' folder.

https://github.com/phonegap/phonegap-plugin-push/issues/1240