add visionOS os target

[mitchellh]

I'm not sure what is involved to add this, but it'd be nice to be able to compile Zig libraries for Apple's new visionOS set to launch the end of this month. The SDK went final this past week. https://developer.apple.com/visionos/

[nektro]

cc @kubkon

[nektro]

we'll also get it with llvm/llvm-project#77674

[andrewrk]

Is it still a Darwin kernel? Should be a pretty trivial enhancement if so.

[mitchellh]

Is it still a Darwin kernel? Should be a pretty trivial enhancement if so.

Yes its Darwin. I think it'll probably have a different MachO object value (not sure what the right terminology it is), but don't expect other significant changes.

[mitchellh]

llvm/llvm-project#77707

The important bits:

• Looks like the MachO values are there, 11 for xros and 12 for the simulator.
• Another confirmation its just a Darwin kernel (though this was well known)

[kubkon]

Potentially blocked by #18576

[mitchellh]

LLVM merged visionOS support in the linker and clang: llvm/llvm-project#77674 (comment)

[andrewrk]

so, do we call it xros like cowards, or visionos like lapdogs?

[mitchellh]

so, do we call it xros like cowards, or visionos like lapdogs?

I recuse myself from this lmao.

[Rexicon226]

so, do we call it xros like cowards, or visionos like lapdogs?

xros is vague and could apply to different things in the future; i think visionos is the way.

[jedisct1]

xros is the SDK name in Xcode, so it's unlikely to apply to something different in the future.

That being said, this is a terrible name, and I'd also prefer the more self-explanatory visionos.

[kubkon]

xros is the SDK name in Xcode, so it's unlikely to apply to something different in the future.

That being said, this is a terrible name, and I'd also prefer the more self-explanatory visionos.

Is it not the same with iOS though? I think it's referred to as iphoneos in Xcode (or xcrun at least) while LLVM and Zig refers to it as .ios. EDIT: my point being, if I am accurate, this gives us precedent to use .visionos instead of the cryptic .xros.

[andrewrk]

Great point, let's proceed with visionos.

[kubkon]

Prelim support in a branch https://github.com/ziglang/zig/tree/visionos. Full support is currently blocked on Zig embracing LLVM 18 which added support for VisionOS as a target. Standalone zld can handle it however provided kubkon/bold#129 and #19563 land.