Weihang Lo 206e3fe6b3

Implement host-target substitution (#15838) ...

### 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"
```

2025-08-18 00:01:34 +00:00

..

build-std

test(build-std): relax the thread name assertion

2025-08-08 17:34:48 -04:00

testsuite

Implement host-target substitution (#15838)

2025-08-18 00:01:34 +00:00