设置 DEVELOPER_DIR 和使用 xcode-select 有什么区别? [英] What is the difference between setting DEVELOPER_DIR and using xcode-select?

问题描述

设置 DEVELOPER_DIR 变量优先于使用 xcode-select 但我很好奇，两者有什么区别?

Setting the DEVELOPER_DIR variable takes precedence over using xcode-select but I'm curious, what is the difference between the two?

如果我在同一台机器上运行多个 Xcode 版本，我应该使用哪个?

Which should I use if I'm running multiple Xcode versions on the same machine?

推荐答案

xcode-select 将始终在系统范围内生效.DEVELOPER_DIR 可用于 per-shell 环境.DEVELOPER_DIR 因此允许您在每个项目的基础上更精确地控制 Xcode 版本，例如在连续集成设置中.

xcode-select will always take effect system-wide. DEVELOPER_DIR can be used in a per-shell environment. DEVELOPER_DIR thus allows you to have more precise control over Xcode version on a per-project basis in for example a continous integration setup.

例如想象一下，您将通过 xcode-select 更改每个项目的版本，然后如果两个单独的项目构建同时运行，那么您可能会遇到问题.但是，如果您改为将每个项目/CI 环境设置为导出它自己的 DEVELOPER_DIR，那么并发构建将不成问题.

E.g. imagine that you would have each project changing version via xcode-select, then if two separate projects builds run concurrently then you would likely have problems. But if you instead setup each project / CI environment to export it's own DEVELOPER_DIR, then concurrent builds won't be an issue.

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