Fix HorizonOS regression in FileTimes

[Meziu]

The changes in #98246 caused a regression for multiple Newlib-based systems. This is just a fix including HorizonOS to the list of targets which require a workaround.

@AzureMarker @ian-h-chamberlain
r? @nagisa

[rustbot]

Hey! It looks like you've submitted a new PR for the library teams!

If this PR contains changes to any rust-lang/rust public library APIs then please comment with @rustbot label +T-libs-api -T-libs to tag it appropriately. If this PR contains changes to any unstable APIs please edit the PR description to add a link to the relevant API Change Proposal or create one if you haven't already. If you're unsure where your change falls no worries, just leave it as is and the reviewer will take a look and make a decision to forward on if necessary.

Examples of T-libs-api changes:

• Stabilizing library features
• Introducing insta-stable changes such as new implementations of existing stable traits on existing stable types
• Introducing new or changing existing unstable library APIs (excluding permanently unstable features / features without a tracking issue)
• Changing public documentation in ways that create new stability guarantees
• Changing observable runtime behavior of library APIs

[joshtriplett]

Does Horizon support any fallback, such as futimes?

@bors r+

[bors]

📌 Commit 926f587 has been approved by joshtriplett

It is now in the queue for this repository.

[ian-h-chamberlain]

Does Horizon support any fallback, such as futimes?

@joshtriplett from a quick look, it seems like there is one in its version of newlib, but the libc crate doesn't a declaration for it, so std can't use it without a libc PR.

Is there a codepath in library/std/src/sys/unix/fs.rs that uses the fallback futimes? It shouldn't be much work to upstream a libc PR to expose the futimes call.

Edit: nevermind, I tried it with the C toolchain and got an undefined reference, so I don't think this is an option. The homebrew filesystem on the 3DS is a bit unusual, so I suppose it's not too surprising.

[Meziu]

Edit: nevermind, I tried it with the C toolchain and got an undefined reference, so I don't think this is an option. The homebrew filesystem on the 3DS is a bit unusual, so I suppose it's not too surprising.

Yeah I had checked for it before making the PR and found it unavailable. I’m sorry for not being active 😓