[Clang] `-mxros-version-min` does not exist

[madsmtm]

Clang allows specifying the deployment target using flags like -miphoneos-version-min, -mtvos-version-min as documented in the attribute docs for availability, but similar functionality is not exposed for xrOS / visionOS.

[llvmbot]

@llvm/issue-subscribers-clang-driver

Author: Mads Marquart (madsmtm)

Clang allows specifying the deployment target using flags like `-miphoneos-version-min`, `-mtvos-version-min` as documented in the [attribute docs for `availability`](https://clang.llvm.org/docs/AttributeReference.html#availability), but similar functionality is not exposed for xrOS / visionOS.

[madsmtm]

Would the proper workaround be to use -mtargetos=xros1.0, or does that have other problems?

[shafik]

CC @Bigcheese @ldionne

[ldionne]

Thanks for the heads up, asking around what to do with this.

[ributzka]

Would the proper workaround be to use -mtargetos=xros1.0, or does that have other problems?

This is not just a workaround - this is now the recommended option. Ideally you use --target, but the next best thing after that is the combination of -arch and -mtargetos.

[ldionne]

This looks like NTBF to me, then. I will tentatively close this, please reopen if someone disagrees.