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Add note about single column rustc-check-cfg

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Urgau 2024-05-06 21:28:43 +02:00
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src/doc/src/reference/build-scripts.md
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@ -264,6 +264,8 @@ the _reachable_ cfg expressions.
For details on the syntax of `CHECK_CFG`, see `rustc` [`--check-cfg` flag][option-check-cfg].
See also the [`unexpected_cfgs`][unexpected-cfgs] lint.
> Note: `cargo:rustc-check-cfg` (single-colon) can be used if your MSRV is below Rust 1.77
The instruction can be used like this:
```rust,no_run