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compiletest: document {ignore,only}-{$target_triple,$target_arch} impl limitation #2319

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compiletest: document {ignore,only}-{$target_triple,$target_arch} impl limitation #2319

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13 changes: 13 additions & 0 deletions src/tests/directives.md
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Expand Up @@ -129,6 +129,19 @@ means the test won't be compiled or run.

Some examples of `X` in `ignore-X` or `only-X`:

> NOTE:
>
> There's a current compiletest implementation limitation that an allow list is used
> to help check for unknown directives (`src/tools/compiletest/src/directive-list.rs`).
> The target triples and target archs for `//@ {ignore,only}-$target_triple` and
> `//@ {ignore,only}-$target_arch` are computed based on all the builtin target specs,
> such that they may be functional directives but are not listed in the known directives
> allow list. In that case, you can `//@ {ignore,only}-{$target_triple,$target_arch}` to
> the directives allow list.
>
> We would like to rework directive handling to make this allow list unnecessary in the
> future.

- A full target triple: `aarch64-apple-ios`
- Architecture: `aarch64`, `arm`, `mips`, `wasm32`, `x86_64`, `x86`,
...
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