mach-o 文件，但在 Flutter 中是不兼容的架构（有 'arm64'，需要 'x86_64'）答案

【问题标题】：mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64') in Fluttermach-o 文件，但在 Flutter 中是不兼容的架构（有 'arm64'，需要 'x86_64'）
【发布时间】：2022-06-21 08:30:33
【问题描述】：

执行dart run ffigen得到如下错误：

Unhandled exception:
Invalid argument(s): Failed to load dynamic library '/Users/bruce/homebrew/opt/llvm/lib/libclang.dylib': dlopen(/Users/bruce/homebrew/opt/llvm/lib/libclang.dylib, 0x0001): tried: '/Users/bruce/homebrew/opt/llvm/lib/libclang.dylib' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64')), '/Users/bruce/homebrew/Cellar/llvm/13.0.1_1/lib/libclang.dylib' (mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64'))
#0      _open (dart:ffi-patch/ffi_dynamic_library_patch.dart:12:43)
#1      new DynamicLibrary.open (dart:ffi-patch/ffi_dynamic_library_patch.dart:23:12)
#2      initializeGlobals (package:ffigen/src/header_parser/data.dart:41:33)
#3      initParser (package:ffigen/src/header_parser/parser.dart:48:3)
#4      parse (package:ffigen/src/header_parser/parser.dart:22:3)
#5      main (package:ffigen/src/executables/ffigen.dart:54:19)
#6      _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:295:32)
#7      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)

我检查了我的 Flutter 环境：

❯ file /Users/bruce/dev_tools/flutter/bin/cache/dart-sdk/bin/dart
/Users/bruce/dev_tools/flutter/bin/cache/dart-sdk/bin/dart: Mach-O 64-bit executable x86_64

当我运行brew install llvm 安装 llvm 时，我得到的是 arm64 的库，我认为这是导致错误的原因：

❯ lipo -info /Users/bruce/homebrew/Cellar/llvm/13.0.1_1/lib/libclang.dylib
Non-fat file: /Users/bruce/homebrew/Cellar/llvm/13.0.1_1/lib/libclang.dylib is architecture: arm64

Flutter SDK 好像没有 Apple Silicon 的版本，请问如何解决？

❯ flutter doctor -v
[✓] Flutter (Channel stable, 2.8.1, on macOS 12.3 21E230 darwin-arm, locale
    zh-Hans-CN)
    • Flutter version 2.8.1 at /Users/bruce/dev_tools/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision 77d935af4d (4 months ago), 2021-12-16 08:37:33 -0800
    • Engine revision 890a5fca2e
    • Dart version 2.15.1
    • Pub download mirror http://10.141.64.130:8080

[✓] Android toolchain - develop for Android devices (Android SDK version
    32.1.0-rc1)
    • Android SDK at /Users/bruce/Library/Android/sdk
    • Platform android-32, build-tools 32.1.0-rc1
    • Java binary at: /Applications/Android
      Studio.app/Contents/jre/Contents/Home/bin/java
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 13.3)
    • Xcode at /Applications/Xcode.app/Contents/Developer
    • CocoaPods version 1.11.3

[✓] Chrome - develop for the web
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2021.1)
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      ???? https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      ???? https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 11.0.11+0-b60-7772763)

我尝试为 Arm 平台安装 Dart SDK，但仍然无法正常工作，使用独立的 Dart 环境，我收到以下错误：

❯ /Users/bruce/dev_tools/dart/bin/dart run ffigen
The Flutter SDK is not available.
#0      BoundSdkSource.getDirectory (package:pub/src/source/sdk.dart:125:7)
#1      SystemCache.load (package:pub/src/system_cache.dart:113:52)
#2      Entrypoint._assertLockFileUpToDate (package:pub/src/entrypoint.dart:599:19)
#3      Entrypoint.assertUpToDate (package:pub/src/entrypoint.dart:525:7)
#4      getExecutableForCommand (package:pub/src/executable.dart:304:16)
#5      RunCommand.run (package:dartdev/src/commands/run.dart:232:32)
#6      CommandRunner.runCommand (package:args/command_runner.dart:209:27)
#7      DartdevRunner.runCommand (package:dartdev/dartdev.dart:232:30)
#8      CommandRunner.run.<anonymous closure> (package:args/command_runner.dart:119:25)
#9      new Future.sync (dart:async/future.dart:296:31)
#10     CommandRunner.run (package:args/command_runner.dart:119:14)
#11     runDartdev (package:dartdev/dartdev.dart:67:29)
#12     main (file:///opt/s/w/ir/cache/builder/sdk/pkg/dartdev/bin/dartdev.dart:11:9)
#13     _delayEntrypointInvocation.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:293:32)
#14     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:192:12)

【问题讨论】：

你的 Flutter 版本几岁了？尝试颤振医生 -v 并更新问题
要运行 ffigen，您只需要 Dart SDK，因此请考虑从此处 (dart.dev/get-dart/archive) 获取 2.16 Arm 并将其安装在单独的文件夹中。
@RichardHeap 我更新了问题描述，好像ffigen不能使用独立的Dart环境执行。
它绝对可以在没有 Flutter 的情况下工作 - 刚刚测试过：D:\source\ffixyz>dart run ffigen --config config.yaml 和 D:\source\ffixyz>dart --version => Dart SDK version: 2.16.1 (stable)

标签： flutter dart dart-ffi

【解决方案1】：

我没想过这个，太可怕了！这里的问题是你如何安装 LLVM，LLVM 本身默认通过 Home-brew 安装为 ARM64，但你应该安装它的 X86_64 版本。要解决这个问题：

卸载当前 LLVM：brew uninstall llvmss
确保安装了 x86_64 的自制软件，如 this medium article 中所示
然后用自制x86版本安装：arch -x86_64 /usr/local/homebrew/bin/brew install llvm

那你 ffi gen 会工作的。

【讨论】：

【解决方案2】：

感谢 Richard Heap 的建议，我已经解决了这个问题！

作为Flutter项目，不能直接对项目目录执行dart命令，因为执行flutter pub get后已经存在一些缓存。先清除包缓存，再执行dart pub get，就可以了。

【讨论】：

【解决方案3】：

如果您在 Rails 中看到 Nokogiri gem 存在此问题，请删除

nokogiri (1.13.6-arm64-darwin)
      racc (~> 1.4)

从您的 Gemfile.lock 并执行 bundle install。

【讨论】：