Using Flutter master
Mac OS

flutter build will run pod install which creates a Framework Search Paths entry that is recursive. i.e.: $(PODS_ROOT)/**. With certain plugins (e.g. Firebase) this will lead to the following build error:

Argument list too long: recursive header expansion failed at /<ios project directory>/Pods/.symlinks/plugins/firebase_storage-0.1.4/android/build/intermediates/classes/debug/com/google/firebase/storage/api.

Removing the recursive entry will allow the build to complete successfully.