Add rust target selector

[pronebird]

Describe the feature

Add a rust target selector to make it possible to develop multi-platform projects with Zed. It would be enough to add a list in JSON and then have a popup list in the UI, i.e:

"targets": [
    "aarch64-apple-ios",
    // etc...
]

Then re-run rust-analyzer on change.

Zed Version and System Specs

Zed: v0.167.1 (Zed)
OS: macOS 14.7.0
Memory: 36 GiB
Architecture: aarch64

[notpeter]

Interesting idea! I've wanted this when trying to troubleshoot/change behavior for Linux while developing on Mac.

As a workaround you should be able to add the following in your zed settings.json:

  "lsp": {
    "rust-analyzer": {
      "initialization_options": {
        "cargo": {
          // "target": "x86_64-unknown-linux-gnu"
          // "target": "x86_64-pc-windows-msvc"
          // "target": "aarch64-apple-darwin"
        }
      }
    }
  }

Then you can uncomment one line if you need to have RA use a specific target triple. You can also include this in a .zed/settings.json inside your project folder if you always want a specific target (e.g. "aarch64-apple-ios") for a given project.

[P1n3appl3]

It's worth noting that rust-analyzer currently doesn't have a way of changing the active cfg, so updating the setting like that and restarting the server is the only way to change cfgs. See rust-lang/rust-analyzer#6117 and rust-lang/rust-analyzer#16346 (meta tracking issue) for the progress on that effort.

If they do grow that functionality we'd totally want to expose it in zed, but right now any "pick a different target" action would have to go modify your settings and restart rust-analyzer itself which I'm not sure we want.

[pronebird]

It's worth noting that rust-analyzer currently doesn't have a way of changing the active cfg, so updating the setting like that and restarting the server is the only way to change cfgs. See rust-lang/rust-analyzer#6117 and rust-lang/rust-analyzer#16346 (meta tracking issue) for the progress on that effort.

Correct, but is it a bad thing?

FYI this is how it works in VSCode.