結論

16G(以上)のUSBメモリ用意して中古のiMACに最新のmacOSとXCodeを入れる

USBメモリ ➡ 32Gがamazonで500円くらいで買える
iMAC ➡ 2014年くらいのだとリコレで30000円くらいで買える

背景

iOSで手軽に色々やりたい
UIに時間かけたくない
お金もかけたくない

経緯

Sonoma

Reactの環境を新しくしようと
この辺とか見て
やってみたがなんかXcodeが古いとか言われて動かない

mac買い替えだと、、、
ノートPCに60万超えってなんやねん

Windowsだって結局古いPCにインストール出来るようになったんだし
Linuxは当然古いPCで動く
macだけ動かないとか無いやろ
と思って調べて見ると、OCLPとかいうのがあるらしい

手順はこのサイトの通りにやった

で、SonomaにしてXcodeも最新の15.1がApp Storeからインストールできた。

一応法的にもセーフらしい

とりあえず単体で動いた

React Native

気を取り直してRNのインストールと実行

なんかビルドに失敗してる

ComputeTargetDependencyGraph
note: Building targets in dependency order
note: Target dependency graph (1 target)
    Target 'sample' in project 'sample' (no dependencies)

GatherProvisioningInputs

CreateBuildDescription
Build description signature: 3e7642d9aa703f29aba3c661c3482a4a
Build description path: /Users/macmac/Library/Developer/Xcode/DerivedData/sample-dcfafkuegajhrndlyelewzidpqge/Build/Intermediates.noindex/XCBuildData/3e7642d9aa703f29aba3c661c3482a4a.xcbuilddata

/Users/macmac/workspace/react/sample/ios/Pods/Target Support Files/Pods-sample/Pods-sample.debug.xcconfig:1:1: error: unable to open configuration settings file
warning: Unable to read contents of XCFileList '/Target Support Files/Pods-sample/Pods-sample-frameworks-Debug-output-files.xcfilelist' (in target 'sample' from project 'sample')
warning: Unable to read contents of XCFileList '/Target Support Files/Pods-sample/Pods-sample-resources-Debug-output-files.xcfilelist' (in target 'sample' from project 'sample')
warning: Run script build phase 'Bundle React Native code and images' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase. (in target 'sample' from project 'sample')
error: Unable to load contents of file list: '/Target Support Files/Pods-sample/Pods-sample-frameworks-Debug-input-files.xcfilelist' (in target 'sample' from project 'sample')
error: Unable to load contents of file list: '/Target Support Files/Pods-sample/Pods-sample-frameworks-Debug-output-files.xcfilelist' (in target 'sample' from project 'sample')
warning: Run script build phase '[CP] Embed Pods Frameworks' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase. (in target 'sample' from project 'sample')
error: Unable to load contents of file list: '/Target Support Files/Pods-sample/Pods-sample-resources-Debug-input-files.xcfilelist' (in target 'sample' from project 'sample')
error: Unable to load contents of file list: '/Target Support Files/Pods-sample/Pods-sample-resources-Debug-output-files.xcfilelist' (in target 'sample' from project 'sample')
warning: Run script build phase '[CP] Copy Pods Resources' will be run during every build because it does not specify any outputs. To address this warning, either add output dependencies to the script phase, or configure it to run in every build by unchecking "Based on dependency analysis" in the script phase. (in target 'sample' from project 'sample')

** BUILD FAILED **

これの通りに実施すると、、、

動いた

その他

Androidは試してません。
iOSより面倒ってことはないでしょう。多分

Rubyは3.3.0を使いました

参考

https://qiita.com/takubii/items/13eb2fff2d8850f55e7d
https://www.taikun-room.com/2022/10/how-to-install-macos-ventura-on-unsupported-mac.html
https://qiita.com/isaatsu0131/items/7438462abd65698a051a