Xcode warnings for main.jsbundle

[yvbeek]

Description

When I build my React-Native project in Xcode, I get about 38 warnings for the main.jsbundle file. Here's a screenshot of some of the warnings.

It looks like these warnings are caused by the hermesc step in the build process:

[snip]/ios/Pods/hermes-engine/destroot/bin/hermesc -emit-binary -Og -out 
[snip]/Library/Developer/Xcode/DerivedData/[snip]/Build/Products/Debug-iphoneos/[snip]/main.jsbundle 
[snip]/Library/Developer/Xcode/DerivedData/[snip]/Build/Products/Debug-iphoneos/main.jsbundle

Is there a way to get rid of these warnings?

React Native Version

0.71.7

Output of npx react-native info

System:
    OS: macOS 13.3.1
    CPU: (12) arm64 Apple M2 Max
    Memory: 1.30 GB / 64.00 GB
    Shell: 5.9 - /bin/zsh
  Binaries:
    Node: 18.14.2 - ~/.nvm/versions/node/v18.14.2/bin/node
    Yarn: 1.22.19 - ~/.nvm/versions/node/v18.14.2/bin/yarn
    npm: 9.6.4 - ~/.nvm/versions/node/v18.14.2/bin/npm
    Watchman: Not Found
  Managers:
    CocoaPods: 1.12.0 - /Users/206637259/.rbenv/shims/pod
  SDKs:
    iOS SDK:
      Platforms: DriverKit 22.4, iOS 16.4, macOS 13.3, tvOS 16.4, watchOS 9.4
    Android SDK: Not Found
  IDEs:
    Android Studio: 2022.2 AI-222.4459.24.2221.9862592
    Xcode: 14.3/14E222b - /usr/bin/xcodebuild
  Languages:
    Java: 11.0.18 - /usr/bin/javac
  npmPackages:
    @react-native-community/cli: Not Found
    react: 18.2.0 => 18.2.0 
    react-native: 0.71.7 => 0.71.7 
    react-native-macos: Not Found
  npmGlobalPackages:
    *react-native*: Not Found

Steps to reproduce

• Create a React-Native project
• Build the project in Xcode

Snack, code example, screenshot, or link to a repository

No example because this is a build issue

[molenick]

Seeing this in the latest RN as well, and can also confirm I found the same source, hermesc.

It would be useful to be able to suppress these (maybe there's already a way to pass flags to hermesc?), but it'd also be useful to see warnings for my Javascript during build without noise.

hermesc --help reveals there's a -w flag for warning suppression. In https://github.com/facebook/react-native/blob/5cfa125b979c7ce76884a81dd3baaddcf4a560fd/packages/react-native/scripts/react-native-xcode.sh#L170 it shows EXTRA_COMPILER_ARGS, but it looks like it's written in script. I don't see a supported way to inject args into this script for hermesc to use.

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This issue was closed because it has been stalled for 7 days with no activity.