Update the rustc usage section of the readme

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bjorn3 2020-04-08 12:32:00 +02:00 committed by GitHub
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@ -25,8 +25,10 @@ If you compiled cg_clif in debug mode you should use `CHANNEL="debug"` instead o
### Rustc
> You should prefer using the Cargo method.
```bash
$ rustc -Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/release/librustc_codegen_cranelift.so --sysroot $cg_clif_dir/build_sysroot/sysroot my_crate.rs
$ rustc +$(cat $cg_clif_dir/rust-toolchain) -Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/release/librustc_codegen_cranelift.so --sysroot $cg_clif_dir/build_sysroot/sysroot my_crate.rs
```
## Env vars