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Add a mention to docs about promoting and demoting platform support #162528

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6 changes: 6 additions & 0 deletions src/doc/rustc/src/platform-support.md
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Expand Up @@ -15,6 +15,12 @@ the compiler what kind of output should be produced.

Component availability is tracked [here](https://rust-lang.github.io/rustup-components-history/).

Support for targets can vary during their lifespan (a target con be promoted because the support
improves or can be demoted because lack of resources). Procedures for promoting and demoting targets
are documented at our [Forge documentation site][forge].

[forge]: https://forge.rust-lang.org/compiler/proposals-and-stabilization.html#targets

## Tier 1 with Host Tools

Tier 1 targets can be thought of as "guaranteed to work". The Rust project
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9 changes: 9 additions & 0 deletions src/doc/rustc/src/target-tier-policy.md
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Expand Up @@ -4,6 +4,7 @@

* [General](#general)
* [Adding a new target](#adding-a-new-target)
* [Promoting or demoting a target](#promoting-or-demoting-a-target)
* [Tier 3 target policy](#tier-3-target-policy)
* [Tier 2 target policy](#tier-2-target-policy)
* [Tier 2 with host tools](#tier-2-with-host-tools)
Expand Down Expand Up @@ -140,6 +141,14 @@ support for the target in `cc` and `libc`.
[`rust-lang/rust`]: https://github.com/rust-lang/rust
[rustc_dev_guide_add_target]: https://rustc-dev-guide.rust-lang.org/building/new-target.html

## Promoting or demoting a target

Support for targets can vary during their lifespan (a target con be promoted because the support
improves or can be demoted because lack of resources). Procedures for promoting and demoting targets
are documented at our [Forge documentation site][forge].

[forge]: https://forge.rust-lang.org/compiler/proposals-and-stabilization.html#targets

## Tier 3 target policy

At this tier, the Rust project provides no official support for a target, so we
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