xcode 10 error: multiple commands produce - react native

Question

So there are a lot of questions like this already, but I'm having the same error, not relating to cocoapods or info.plist, at least I don't think, because none of the solutions worked for me.

I just recently upgraded to Xcode 10.0, and building my react native app gives this error:

Multiple commands produce '/Users/username/Library/Developer/Xcode/DerivedData/appname-code/Build/Products/Release-iphoneos/appname.app':
1) Target 'appname' has create directory command with output '/Users/username/Library/Developer/Xcode/DerivedData/appname-code/Build/Products/Release-iphoneos/appname.app'
2) That command depends on command in Target 'appname': script phase “[CP] Copy Pods Resources”

How do I fix this error?

Answer 1

I have resolved my issue in Xcode 10.2 through below steps:

change the build system to Legacy

File > Workspace Settings > Build System > Legacy Build System.

Answer 2

I fixed it by upgrading cocoapods to the latest version:

1. Close Xcode project.
2. Upgrade cocoapods to latest version - run "sudo gem install cocoapods"
3. Follow steps here to remove existing pods
4. Run "pod install" in the project directory

Answer 3

For those using React Native and Cocoapods

The issue was produced by some libRN...a files. I fixed it by removing some of them like libRNScreens.a and libRNGestureHandler.a from Build Phases -> Link Binary with Libraries since they were already being referenced from another libraries. Others had to be replaced by their Pod version like libRNDeviceInfo.a:

Answer 4

My solution was in removing all that installer.pods_project.targets.each do |target| ... installer.pods_project.targets.each do |target| ... fixes from Podfile also I had pod 'React', :path => '... which I also removed. So my Podfile now looks like this

require_relative '../node_modules/react-native/scripts/react_native_pods'
require_relative '../node_modules/@react-native-community/cli-platform-ios/native_modules'

platform :ios, '12.4'

target 'AppName' do
  config = use_native_modules!

  use_react_native!(
    :path => config[:reactNativePath],
    :hermes_enabled => false
  )

  use_flipper!()

  post_install do |installer|
    react_native_post_install(installer)
  end
end

Default react-native Podfile

I was migrating from react-native 0.59 to 0.64