# build-alert
[<img alt="github" src="https://img.shields.io/badge/github-dtolnay/build--alert-8da0cb?style=for-the-badge&labelColor=555555&logo=github" height="20">](https://github.com/dtolnay/build-alert)
[<img alt="crates.io" src="https://img.shields.io/crates/v/build-alert.svg?style=for-the-badge&color=fc8d62&logo=rust" height="20">](https://crates.io/crates/build-alert)
[<img alt="docs.rs" src="https://img.shields.io/badge/docs.rs-build--alert-66c2a5?style=for-the-badge&labelColor=555555&logo=docs.rs" height="20">](https://docs.rs/build-alert)
[<img alt="build status" src="https://img.shields.io/github/actions/workflow/status/dtolnay/build-alert/ci.yml?branch=master&style=for-the-badge" height="20">](https://github.com/dtolnay/build-alert/actions?query=branch%3Amaster)
Display a message in the Cargo build output during compilation.
```toml
[dependencies]
build-alert = "0.1"
```
<br>
## Example
```rust
#[cfg(debug_assertions)]
build_alert::yellow! {"
NOTE: use --release
Syn's test suite has some tests that run on every source file
and test case in the rust-lang/rust repo, which can be pretty
slow in debug mode. Consider running cargo test with `--release`
to speed things up.
"}
#[cfg(not(feature = "all-features"))]
build_alert::red! {"
ERROR: use --all-features
Syn's test suite normally only works with all-features enabled.
Run again with `--all-features`, or run with `--features test`
to bypass this check.
"}
```
<br>
#### License
<sup>
Licensed under either of <a href="LICENSE-APACHE">Apache License, Version
2.0</a> or <a href="LICENSE-MIT">MIT license</a> at your option.
</sup>
<br>
<sub>
Unless you explicitly state otherwise, any contribution intentionally submitted
for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
be dual licensed as above, without any additional terms or conditions.
</sub>