Build failure for i686-unknown-hurd-gnu

[asomers]

Due to bytecodealliance/rustix#1007 , the Nix CI build fails for i686-unknown-hurd-gnu .

> cargo check -Zbuild-std --target i686-unknown-hurd-gnu --all-features --all-targets
    Checking rustix v0.38.31
error[E0609]: no field `st_atime` on type `&libc::stat64`
   --> /home/somers/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustix-0.38.31/src/fs/mod.rs:168:14
    |
168 |         self.st_atime as i64
    |              ^^^^^^^^ unknown field
    |
help: a field with a similar name exists
    |
168 |         self.st_atim as i64
    |              ~~~~~~~

error[E0609]: no field `st_mtime` on type `&libc::stat64`
   --> /home/somers/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustix-0.38.31/src/fs/mod.rs:172:14
    |
172 |         self.st_mtime as i64
    |              ^^^^^^^^ unknown field
    |
help: a field with a similar name exists
    |
172 |         self.st_mtim as i64
    |              ~~~~~~~

error[E0609]: no field `st_ctime` on type `&libc::stat64`
   --> /home/somers/.cargo/registry/src/index.crates.io-6f17d22bba15001f/rustix-0.38.31/src/fs/mod.rs:176:14
    |
176 |         self.st_ctime as i64
    |              ^^^^^^^^ unknown field
    |
help: a field with a similar name exists
    |
176 |         self.st_ctim as i64
    |              ~~~~~~~

For more information about this error, try `rustc --explain E0609`.
error: could not compile `rustix` (lib) due to 3 previous errors

As a hobby OS, I think we should permanently remove it from CI.

[SteveLauC]

Here is the error I got with the --all-targets option:

$ cargo +nightly --version
cargo 1.78.0-nightly (cdf84b69d 2024-02-02)

$ rg "libc" Cargo.toml
31:libc = { version = "0.2.153", features = ["extra_traits"] }

$ cargo +nightly check -Zbuild-std --target i686-unknown-hurd-gnu --all-features --all-targets
    Checking getrandom v0.2.10
error: target is not supported, for more information see: https://docs.rs/getrandom/#unsupported-targets
   --> /home/steve/.cargo/registry/src/index.crates.io-6f17d22bba15001f/getrandom-0.2.10/src/lib.rs:290:9
    |
290 | /         compile_error!("target is not supported, for more information see: \
291 | |                         https://docs.rs/getrandom/#unsupported-targets");
    | |________________________________________________________________________^

error[E0433]: failed to resolve: use of undeclared crate or module `imp`
   --> /home/steve/.cargo/registry/src/index.crates.io-6f17d22bba15001f/getrandom-0.2.10/src/lib.rs:341:9
    |
341 |         imp::getrandom_inner(dest)?;
    |         ^^^ use of undeclared crate or module `imp`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `getrandom` (lib) due to 2 previous errors

With the --lib option, it compiles without errors:

$ cargo +nightly check -Zbuild-std --target i686-unknown-hurd-gnu --all-features --lib
    Finished dev [unoptimized + debuginfo] target(s) in 0.02s

With --tests:

$ cargo +nightly check -Zbuild-std --target i686-unknown-hurd-gnu --all-features --tests
    Checking getrandom v0.2.10
error: target is not supported, for more information see: https://docs.rs/getrandom/#unsupported-targets
   --> /home/steve/.cargo/registry/src/index.crates.io-6f17d22bba15001f/getrandom-0.2.10/src/lib.rs:290:9
    |
290 | /         compile_error!("target is not supported, for more information see: \
291 | |                         https://docs.rs/getrandom/#unsupported-targets");
    | |________________________________________________________________________^

error[E0433]: failed to resolve: use of undeclared crate or module `imp`
   --> /home/steve/.cargo/registry/src/index.crates.io-6f17d22bba15001f/getrandom-0.2.10/src/lib.rs:341:9
    |
341 |         imp::getrandom_inner(dest)?;
    |         ^^^ use of undeclared crate or module `imp`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `getrandom` (lib) due to 2 previous errors

With --examples:

$ cargo +nightly check -Zbuild-std --target i686-unknown-hurd-gnu --all-features --examples
    Checking getrandom v0.2.10
    Checking parking_lot v0.12.1
    Checking tempfile v3.8.0
error: target is not supported, for more information see: https://docs.rs/getrandom/#unsupported-targets
   --> /home/steve/.cargo/registry/src/index.crates.io-6f17d22bba15001f/getrandom-0.2.10/src/lib.rs:290:9
    |
290 | /         compile_error!("target is not supported, for more information see: \
291 | |                         https://docs.rs/getrandom/#unsupported-targets");
    | |________________________________________________________________________^

error[E0433]: failed to resolve: use of undeclared crate or module `imp`
   --> /home/steve/.cargo/registry/src/index.crates.io-6f17d22bba15001f/getrandom-0.2.10/src/lib.rs:341:9
    |
341 |         imp::getrandom_inner(dest)?;
    |         ^^^ use of undeclared crate or module `imp`

For more information about this error, try `rustc --explain E0433`.
error: could not compile `getrandom` (lib) due to 2 previous errors
warning: build failed, waiting for other jobs to finish...

Update: With libc 0.2.152, I got the same errors