# build-alert
[
](https://github.com/dtolnay/build-alert)
[
](https://crates.io/crates/build-alert)
[
](https://docs.rs/build-alert)
[
](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"
```
## 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.
"}
```
#### License
Licensed under either of Apache License, Version
2.0 or MIT license at your option.
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.