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tell about STAGE0_MISSING_TARGETS for new targets #1996

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Jun 16, 2024
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tell about STAGE0_MISSING_TARGETS for new targets #1996

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11 changes: 11 additions & 0 deletions src/building/new-target.md
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Original file line number Diff line number Diff line change
Expand Up @@ -94,6 +94,17 @@ adding `NEW_TARGET_OS` as `target_os`:
+ (Some(Mode::Std), "target_os", Some(&["watchos", "NEW_TARGET_OS"])),
```

To use this target in bootstrap, we need to explicitly add the target triple to the `STAGE0_MISSING_TARGETS`
list in `src/bootstrap/src/core/sanity.rs`. This is necessary because the default compiler bootstrap uses does
not recognize the new target we just added. Therefore, it should be added to `STAGE0_MISSING_TARGETS` so that the
bootstrap is aware that this target is not yet supported by the stage0 compiler.

```diff
const STAGE0_MISSING_TARGETS: &[&str] = &[
+ "NEW_TARGET_TRIPLE"
];
```

## Patching crates

You may need to make changes to crates that the compiler depends on,
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