### What does this PR try to resolve?
This PR resolves: https://github.com/rust-lang/cargo/issues/13051
Namely, it allows users to invoke cargo subcommands that accept a
`--target` directive to specify the `host` target, which is later
substituted in the command processing layer by the host's real target
triple (for instance, on most Linux distributions, `cargo build --target
host` would effectively run `cargo build --target
x86_64-unknown-linux-gnu`).
This additionally applies to usage within `config.toml`, like so:
```toml
# .cargo/config.toml
[build]
target = "host"
```
### What does this PR try to resolve?
There is incompatibility between rustix@1.0.8 and libc@0.2.175 that
leads to compilation errors.
See
* https://github.com/bytecodealliance/rustix/issues/1496
* https://github.com/rust-lang/rust/pull/145478#issuecomment-3193494156
### How to test and review this PR?
In rust-lang/rust, update the `src/tools/cargo` submodule accordingly,
and run
```
cargo run --manifest-path src/ci/citool/Cargo.toml run-local dist-loongarch64-musl
```
With this downgrade it should compile.
Aside from `false`, the `lto` options seem to be ordered from "most
optimizing" to "least optimizing".
If this interpretation is correct, then I think `false` should go
between `thin` and `off`.
cc: @ehuss (who I think wrote that text)
### What does this PR try to resolve?
Part of #15844
Set up `-Zbuild-analysis` flag and `build.analysis` configuration table
to lay the ground work.
when `build.analysis.enabled = true`, enables HTML timing output to
pretend we are persisting timing data for now. This will change when the
storage part is implemented.
### How to test and review this PR?
### What does this PR try to resolve?
clarifies that cargo doc --no-deps will not delete previously-built
dependency docs, and points users to cargo clean --doc or manual
deletion if they want a truly “fresh” doc set. This pr fixed
https://github.com/rust-lang/cargo/issues/15728
### How to test and review this PR?
No testing required.
### What does this PR try to resolve?
While working on a [plumbing
command](https://github.com/crate-ci/cargo-plumbing) for feature
resolution, I hit a dead end where the fields and types are private.
This PR changes the needed things into `pub`.
r? @epage
### How to test and review this PR?
`cargo check`
Bumps [slab](https://github.com/tokio-rs/slab) from 0.4.10 to 0.4.11.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/tokio-rs/slab/releases">slab's
releases</a>.</em></p>
<blockquote>
<h2>v0.4.11</h2>
<ul>
<li>Fix <code>Slab::get_disjoint_mut</code> out of bounds (<a
href="https://redirect.github.com/tokio-rs/slab/issues/152">#152</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tokio-rs/slab/blob/master/CHANGELOG.md">slab's
changelog</a>.</em></p>
<blockquote>
<h1>0.4.11 (August 8, 2025)</h1>
<ul>
<li>Fix <code>Slab::get_disjoint_mut</code> out of bounds (<a
href="https://redirect.github.com/tokio-rs/slab/issues/152">#152</a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="2e5779f8eb"><code>2e5779f</code></a>
Release v0.4.11 (<a
href="https://redirect.github.com/tokio-rs/slab/issues/153">#153</a>)</li>
<li><a
href="2d65c514bc"><code>2d65c51</code></a>
Fix get_disjoint_mut error condition (<a
href="https://redirect.github.com/tokio-rs/slab/issues/152">#152</a>)</li>
<li>See full diff in <a
href="https://github.com/tokio-rs/slab/compare/v0.4.10...v0.4.11">compare
view</a></li>
</ul>
</details>
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</details>
### What does this PR try to resolve?
RFC 3841 has merged, and x86_64-apple-darwin will be demoted to tier-2
in 1.90.0. In Cargo we usually run test against tier-1 platforms, so
x86_64-apple-darwin should be removed.
Also, that target platform is often the slowest one in CI, we are happy
to remove it to save us a couple of minutes.
https://rust-lang.github.io/rfcs/3841-demote-x86_64-apple-darwin.html
### How to test and review this PR?
Run `cargo test` locally with cross-compile tests enabled, and no
regression.
