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nnethercote merged 1 commit into from
Feb 4, 2024
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Add Cranelift codegen backend to compile time optimization #72

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15 changes: 15 additions & 0 deletions src/build-configuration.md
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Expand Up @@ -353,6 +353,21 @@ up to 50%. But the effects vary widely and depend on the characteristics of the
code and its build configuration, and for some programs there is no compile
time improvement.

### Codegen backend
You can use a different codegen backend to reduce compile times. Currently,
the Cranelift codegen backend is available in the nightly chanel for Linux x64 and 64-bit ARM targets.

You can install it with this `rustup` command:
```bash
$ rustup component add rustc-codegen-cranelift-preview --toolchain nightly
```

And then use it with one of the following commands:
- `RUSTFLAGS="-Zcodegen-backend=cranelift" cargo +nightly build`
- `CARGO_PROFILE_DEV_CODEGEN_BACKEND=cranelift cargo +nightly build -Zcodegen-backend`

You can find more information about this codegen backend [here](https://github.com/rust-lang/rustc_codegen_cranelift).

## Custom profiles

In addition to the `dev` and `release` profiles, Cargo supports [custom
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