Document minimum supported versions for apple operating systems to platform documentation about rust HOT 3 CLOSED

The platform support docs are the right place for this, yes. I think adding it to the platform support docs and then also leaving a comment next to them linking to DEPLOYMENT_TARGET and the other way around should ensure that they stay in sync.

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We give the arm64e-apple-* triples a higher default deployment target since the hardware is only supported on those newer OS versions. It's technically the same story with x86_64h-apple-darwin, although there the version is macOS 10.8, which is lower than the minimum Rust already requires.

I think it's a good idea to add to the platform support docs, I was considering splitting it into the following pages / "categories":

• *-apple-darwin
• *-apple-ios
• *-apple-tvos
• *-apple-watchos
• *-apple-visionos
• *-apple-ios-macabi (Mac Catalyst is sufficiently different from iOS that it makes sense to document it separately)
• x86_64h-apple-darwin (Documents only the things relating to x86_64h, links to *-apple-darwin for the rest)
• arm64e-apple-* (Same idea as above)

Do you think that's a good idea? In any case, I'd like to do this work:
@rustbot claim

CC @Nilstrieb who is working on target docs
CC @thomcc

@rustbot label O-macos O-ios O-tvos O-watchos O-visionos

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Related: cc might soon require setting the deployment target when cross-compiling these platforms from non-macOS, so maybe it makes sense to have a top-level *-apple-* page explaining these targets in general, including cross compilation stuff?

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