[Xcode 11] 'Multiple commands produce' error when building with new Xcode build system

• Review the documentation: https://github.com/oblador/react-native-vector-icons
• Search for existing issues (including closed issues): https://github.com/oblador/react-native-vector-icons/issues

Environment

MacOS 10.14.6 RN 0.60.5 Latest RNVI Building on iOS

Description

Describe your issue in detail. Include screenshots if needed.

Reproducible Demo

https://github.com/facebook/react-native/issues/20492#issuecomment-533912772

On Xcode before upgrade 11, things work correctly and font assets copy without fatal error.

After Xcode 11 stable released and upgraded, it required fonts removal under [CP] Copy Pods Resources in Build Phases. Subsequent pod update brings them back, needing manual removal again.

Not sure if this is fixable only with special treatment on Xcode >= 11?

[jacklj]

Removing duplicate font files in Copy Bundle Resources worked for me.

The problem seems to be caused by the new autolinking feature in React Native 0.60 - the line use_native_modules! in ios/Podfile means when you do pod install, any pods found in node_modules are automatically linked. This means that links to all font files are added to [CP] Copy Pods Resources when you do pod install.

If you previously installed react-native-vector-icons manually by adding the font files to Copy Bundle Resources, you then get a “Multiple commands produce…” fatal build error.

So to fix the problem, just remove the font files from Copy Bundle Resources, so that they are only in [CP] Copy Pods Resources.

[bpouzet]

Find a solution, simply remove duplicate reference fonts in “Copy Bundle Resources” NOT in “[CP] Copy Pods Resources”