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M1チップのMacでCocoaPodsのエラー出る場合の解決方法

M1チップのMacでCocoaPodsのエラー出る場合の解決方法
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Apple Silicon(M1チップ)のMacでCocoaPodsのエラーが発生したときの解決方法

Apple Silicon (Apple M1チップ)のMac mini（macOS Big Sur）でCocoaPodsのpod installコマンドでエラーが発生しました。

CocoaPods自体のインストールは完了している前提です。
まだの場合は以下コマンドでCocoaPodsをインストールしましょう。

sudo gem install cocoapods

pod installのエラー内容から対処方法まで

ヒーラー
従来のMacで成功実績のあるpodfileに対してエラーが発生したので、M1チップが怪しい

問題

従来のMacbookで実績のあるpodfileに対して、pod install（pod update）したところ、以下エラーが発生しました。

% pod install

Update all pods
Updating local specs repositories

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### Command

```
/usr/local/bin/pod update
```

### Report

* What did you do?

* What did you expect to happen?

* What happened instead?


### Stack

```
   CocoaPods : 1.10.1
        Ruby : ruby 2.6.3p62 (2019-04-16 revision 67580) [universal.arm64e-darwin20]
    RubyGems : 3.0.3
        Host : macOS 11.1 (20C69)
       Xcode : 12.3 (12C33)
         Git : git version 2.24.3 (Apple Git-128)
Ruby lib dir : /System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib
Repositories : trunk - CDN - https://cdn.cocoapods.org/
```

### Plugins

```
cocoapods-deintegrate : 1.0.4
cocoapods-plugins     : 1.0.0
cocoapods-search      : 1.0.0
cocoapods-trunk       : 1.5.0
cocoapods-try         : 1.2.0
```

### Podfile

```ruby
...
```

### Error

```
LoadError - dlopen(/Library/Ruby/Gems/2.6.0/gems/ffi-1.14.2/lib/ffi_c.bundle, 0x0009): missing compatible arch in /Library/Ruby/Gems/2.6.0/gems/ffi-1.14.2/lib/ffi_c.bundle - /Library/Ruby/Gems/2.6.0/gems/ffi-1.14.2/lib/ffi_c.bundle
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/ffi-1.14.2/lib/ffi.rb:6:in `rescue in <top (required)>'
/Library/Ruby/Gems/2.6.0/gems/ffi-1.14.2/lib/ffi.rb:3:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/ethon-0.12.0/lib/ethon.rb:2:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/typhoeus-1.4.0/lib/typhoeus.rb:2:in `<top (required)>'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/System/Library/Frameworks/Ruby.framework/Versions/2.6/usr/lib/ruby/2.6.0/rubygems/core_ext/kernel_require.rb:54:in `require'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/cdn_source.rb:440:in `download_typhoeus_impl_async'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/cdn_source.rb:372:in `download_and_save_with_retries_async'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/cdn_source.rb:365:in `download_file_async'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/cdn_source.rb:338:in `download_file'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/cdn_source.rb:78:in `deprecated_local_podspecs'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/cdn_source.rb:60:in `preheat_existing_files'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-core-1.10.1/lib/cocoapods-core/cdn_source.rb:257:in `update'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/sources_manager.rb:135:in `block (3 levels) in update'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/sources_manager.rb:134:in `block (2 levels) in update'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/sources_manager.rb:133:in `each'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/sources_manager.rb:133:in `block in update'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/sources_manager.rb:131:in `open'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/sources_manager.rb:131:in `update'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:145:in `block in update_repositories'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:143:in `each'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer/analyzer.rb:143:in `update_repositories'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:235:in `block in resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/user_interface.rb:64:in `section'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:234:in `resolve_dependencies'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/installer.rb:160:in `install!'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/command/update.rb:63:in `run'
/Library/Ruby/Gems/2.6.0/gems/claide-1.0.3/lib/claide/command.rb:334:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/lib/cocoapods/command.rb:52:in `run'
/Library/Ruby/Gems/2.6.0/gems/cocoapods-1.10.1/bin/pod:55:in `<top (required)>'
/usr/local/bin/pod:23:in `load'
/usr/local/bin/pod:23:in `<main>'
```

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[!] Oh no, an error occurred.

Search for existing GitHub issues similar to yours:
https://github.com/CocoaPods/CocoaPods/search?q=dlopen%28%2FLibrary%2FRuby%2FGems%2F2.6.0%2Fgems%2Fffi-1.14.2%2Flib%2Fffi_c.bundle%2C+0x0009%29%3A+missing+compatible+arch+in+%2FLibrary%2FRuby%2FGems%2F2.6.0%2Fgems%2Fffi-1.14.2%2Flib%2Fffi_c.bundle+-+%2FLibrary%2FRuby%2FGems%2F2.6.0%2Fgems%2Fffi-1.14.2%2Flib%2Fffi_c.bundle&type=Issues

If none exists, create a ticket, with the template displayed above, on:
https://github.com/CocoaPods/CocoaPods/issues/new

Be sure to first read the contributing guide for details on how to properly submit a ticket:
https://github.com/CocoaPods/CocoaPods/blob/master/CONTRIBUTING.md

Don't forget to anonymize any private data!

Looking for related issues on cocoapods/cocoapods...
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長々とエラーの表示が続きますが、最終的に下の方に参考リンクが載せてくれていました。

解決方法

参考リンクの情報もあり、どうやらM1チップでは事足りないようで、Intelプロセッサとして実行する必要がありそうです。

ターミナルの「Rosettaを使用して開く」にチェックを入れる

ターミナルアプリをFinderから見つけます。「アプリケーション」-「ユーティリティ」にあります。
右クリックで「情報を見る」でプロパティを開かれるので、「Rosettaを使用して開く」のチェックを入れます。
これで、Appleシリコン搭載のMacでも、Intelプロセッサ用のアプリが扱えるようになるようです。
ターミナルアプリを一度終了させ、再起動しましょう。

terminal_rosetta
ターミナル.app
ffiをインストールする

次に、ターミナルで以下コマンドを実行してffiをインストールします。

$ sudo gem install ffi

※FFI（Foreign function interface）とは、あるプログラミング言語から他のプログラミング言語で定義された関数などを利用するための機構だそうです。

そして、もう一度 pod install を試してみましょう。

参考

https://github.com/CocoaPods/CocoaPods/issues/9907

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