Support Apple Vision Pro

[simlay]

Apple Vision Pro support was added as a tier 3 target to rust in rust-lang/rust#121419 with target_os of visionos.

Depends on:

• visionOS Support rust-lang/libc#3568 to actually build the stdlib with the -Zbuild-std flag for aarch64-apple-visionos or the simulator target.

[simlay]

After looking into this a bit, the current default xcode used on the macOS-14 runner is 15.0.1. The visionOS simulator requires xcode 15.2+ and I don't feel like adding in the logic to switch between xcode versions in this CI.

Also, actions/runner-images#9511

[simlay]

Well, this still applies. I can either remove visionOS from the CI matrix or we can wait until the macos runner updates the default xcode. I'm not sure what the xcode versioning policy is (if there is one) on github runners.

[briansmith]

How about we do all the steps, including creating the simulator and deleting it, but making the steps that fail (presumably just lines 106 or 107) conditional:

if [ -z "${GITHUB_ACTIONS}" ]; then
   # These steps fail in GitHub Actions due to https://...
fi

[briansmith]

This looks awesome. I didn't test it because I don't have a mac available to me right now. Some comments....

[briansmith]

If you add here:

            xcode_version: 15.2

then before you run the shell script you can add a step:

      - if: ${{ matrix.xcode_version != '' }}
        run: sudo xcode-select -s /Applications/Xcode_${{ matrix.xcode_version }}.app

This is what I've done in my CI.

[briansmith]

How about we do all the steps, including creating the simulator and deleting it, but making the steps that fail (presumably just lines 106 or 107) conditional:

if [ -z "${GITHUB_ACTIONS}" ]; then
   # These steps fail in GitHub Actions due to https://...
fi