【Flutter】Xcode16で出たiOSビルドエラーの解決方法

Xcode 16.0にしてからFlutterのiOSビルドでエラーが出るようになりました。その解決方法の備忘録です。

出たエラー

エラー1

Running Xcode build...
Xcode build done.                                           16.9s
Failed to build iOS app
Error output from Xcode build:
↳
    --- xcodebuild: WARNING: Using the first of multiple matching destinations:
    { platform:iOS Simulator, id:96ECC615-22F8-4AC5-A243-23A97150BEA6, OS:17.5, name:iPhone 15 Pro }
    { platform:iOS Simulator, id:96ECC615-22F8-4AC5-A243-23A97150BEA6, OS:17.5, name:iPhone 15 Pro }
    ** BUILD FAILED **


Xcode's output:
↳
    Writing result bundle at path:
    	/var/folders/qk/cdlmk8g134l9p2_9m1_wxbym0000gn/T/flutter_tools.PZX7AE/flutter_ios_build_temp_dirMrXiGG/temporary_xcresult_bundle

    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')
    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')
    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')
    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')
    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')
    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')
    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')
    error: unsupported option '-G' for target 'arm64-apple-ios14.0-simulator' (in target 'BoringSSL-GRPC' from project 'Pods')

エラー2

Error (Xcode): unsupported option '-G' for target 'x86_64-apple-ios12.0-simulator'

解決方法

以下を全部やりました。

1. Xcode Settingsで ALLOW_NON_MODULAR_INCLUDES_IN_FRAMEWORK_MODULES = YES にする
2. 以下をpodfileに追記

post_install do |installer|
  installer.pods_project.targets.each do |target|
    if target.name == 'BoringSSL-GRPC'
      target.source_build_phase.files.each do |file|
        if file.settings && file.settings['COMPILER_FLAGS']
          flags = file.settings['COMPILER_FLAGS'].split
          flags.reject! { |flag| flag == '-GCC_WARN_INHIBIT_ALL_WARNINGS' }
          file.settings['COMPILER_FLAGS'] = flags.join(' ')
        end
      end
    end
  end
end

3. 以下のコマンドを打ってクリーンにする

cd ios
rm -rf Pods
rm -rf Podfile.lock
rm -rf ~/Library/Developer/Xcode/DerivedData/*
pod cache clean --all
arch -x86_64 pod install
brew install rbenv
sudo gem install cocoapods
flutter clean
flutter pub get

参考にしたリンク

https://github.com/grpc/grpc/pull/36904#issuecomment-2183436448
https://stackoverflow.com/a/78633109/10339551