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cfg_attr needs a valid predicate #812

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Merged
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May 14, 2020
Merged

cfg_attr needs a valid predicate #812

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6 changes: 3 additions & 3 deletions src/conditional-compilation.md
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Original file line number Diff line number Diff line change
Expand Up @@ -266,7 +266,7 @@ either be found at `linux.rs` or `windows.rs` based on the target.

<!-- ignore: `mod` needs multiple files -->
```rust,ignore
#[cfg_attr(linux, path = "linux.rs")]
#[cfg_attr(target_os = "linux", path = "linux.rs")]
#[cfg_attr(windows, path = "windows.rs")]
mod os;
```
Expand All @@ -286,9 +286,9 @@ fn bewitched() {}
```

> **Note**: The `cfg_attr` can expand to another `cfg_attr`. For example,
> `#[cfg_attr(linux, cfg_attr(feature = "multithreaded", some_other_attribute))]`
> `#[cfg_attr(target_os = "linux", cfg_attr(feature = "multithreaded", some_other_attribute))]`
> is valid. This example would be equivalent to
> `#[cfg_attr(all(linux, feature ="multithreaded"), some_other_attribute)]`.
> `#[cfg_attr(all(target_os = "linux", feature ="multithreaded"), some_other_attribute)]`.

The `cfg_attr` attribute is allowed anywhere attributes are allowed.

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