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Jan 28, 2025
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Add .cargo/config.toml example #591

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11 changes: 8 additions & 3 deletions README.md
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Expand Up @@ -86,9 +86,14 @@ of randomness based on their specific needs:
| `custom` | All targets | `*` | User-provided custom implementation (see [custom backend])

Opt-in backends can be enabled using the `getrandom_backend` configuration flag.
The flag can be set either by specifying the `rustflags` field in
[`.cargo/config.toml`] (note that it can be done on a per-target basis), or by using
the `RUSTFLAGS` environment variable:
The flag can be set either by specifying the `rustflags` field in [`.cargo/config.toml`]:
```toml
# It's recommended to set the flag on a per-target basis:
[target.wasm32-unknown-unknown]
rustflags = ['--cfg', 'getrandom_backend="wasm_js"']
```

Or by using the `RUSTFLAGS` environment variable:

```sh
RUSTFLAGS='--cfg getrandom_backend="linux_getrandom"' cargo build
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