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Warn users about limited review for tier 2 and 3 code #120174

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Jan 22, 2024
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Warn users about limited review for tier 2 and 3 code #120174

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18 changes: 18 additions & 0 deletions src/doc/rustc/src/platform-support.md
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Expand Up @@ -72,6 +72,12 @@ ensure that each tier 2 target can be used as build target after each change. Au
not always run so it's not guaranteed to produce a working build, but tier 2
targets often work to quite a good degree and patches are always welcome!

Tier 2 target-specific code is not closely scrutinized by Rust team(s) when
modifications are made. Bugs are possible in all code, but the level of quality
control for these targets is likely to be lower. See [library team
policy](https://std-dev-guide.rust-lang.org/policy/target-code.html) for
details on the review practices for standard library code.

Tier 2 targets with host tools additionally support running tools like `rustc`
and `cargo` natively on the target, and automated builds ensure that the host
tools build as well. This allows the target to be used as a development
Expand Down Expand Up @@ -121,6 +127,12 @@ The `std` column in the table below has the following meanings:

[`no_std`]: https://rust-embedded.github.io/book/intro/no-std.html

Tier 2 target-specific code is not closely scrutinized by Rust team(s) when
modifications are made. Bugs are possible in all code, but the level of quality
control for these targets is likely to be lower. See [library team
policy](https://std-dev-guide.rust-lang.org/policy/target-code.html) for
details on the review practices for standard library code.

**NOTE:** The `rust-docs` component is not usually built for tier 2 targets,
so Rustup may install the documentation for a similar tier 1 target instead.

Expand Down Expand Up @@ -211,6 +223,12 @@ The `std` column in the table below has the following meanings:

[`no_std`]: https://rust-embedded.github.io/book/intro/no-std.html

Tier 3 target-specific code is not closely scrutinized by Rust team(s) when
modifications are made. Bugs are possible in all code, but the level of quality
control for these targets is likely to be lower. See [library team
policy](https://std-dev-guide.rust-lang.org/policy/target-code.html) for
details on the review practices for standard library code.

The `host` column indicates whether the codebase includes support for building
host tools.

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