std: Don't use linkat on the wasm32-wasi* targets
#149864
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This commit is a follow-up to 147572 and the issue reported at the end of that PR where the `std::fs::hard_link` function is broken after that PR landed. The true culprit and bug here is fixed in WebAssembly/wasi-libc/690 but until that's released in a wasi-sdk version it should be reasonable, on WASI, to skip the `linkat` function.
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alexcrichton
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Dec 10, 2025
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| any(target_os = "vxworks", target_os = "redox", target_os = "android", target_os = "espidf", target_os = "horizon", target_os = "vita", target_env = "nto70") => { | ||
| // VxWorks, Redox and ESP-IDF lack `linkat`, so use `link` instead. POSIX leaves | ||
| // it implementation-defined whether `link` follows symlinks, so rely on the | ||
| // `symlink_hard_link` test in library/std/src/fs/tests.rs to check the behavior. | ||
| // Android has `linkat` on newer versions, but we happen to know `link` | ||
| // always has the correct behavior, so it's here as well. | ||
| any( | ||
| // VxWorks, Redox and ESP-IDF lack `linkat`, so use `link` instead. | ||
| // POSIX leaves it implementation-defined whether `link` follows | ||
| // symlinks, so rely on the `symlink_hard_link` test in | ||
| // library/std/src/fs/tests.rs to check the behavior. | ||
| target_os = "vxworks", | ||
| target_os = "redox", | ||
| target_os = "espidf", | ||
| // Android has `linkat` on newer versions, but we happen to know | ||
| // `link` always has the correct behavior, so it's here as well. | ||
| target_os = "android", | ||
| // wasi-sdk-29-and-prior have a buggy `linkat` so use `link` instead | ||
| // until wasi-sdk is updated (see WebAssembly/wasi-libc#690) | ||
| target_os = "wasi", | ||
| // Other misc platforms | ||
| target_os = "horizon", | ||
| target_os = "vita", | ||
| target_env = "nto70", | ||
| ) => { |
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As a note for this I took the liberty to reformat the line to be less long and arrange the comments to apply to the platform-in-question too.
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This commit is a follow-up to #147572 and the issue reported at the end of that PR where the
std::fs::hard_linkfunction is broken after that PR landed. The true culprit and bug here is fixed in WebAssembly/wasi-libc#690 but until that's released in a wasi-sdk version it should be reasonable, on WASI, to skip thelinkatfunction.