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# Work in progress cranelift codegen backend for rust
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> ⚠⚠⚠ This doesn't do much useful yet ⚠⚠⚠
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## Building
```bash
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$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
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$ cd rustc_codegen_cranelift
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$ ./prepare.sh # download and patch sysroot src and install hyperfine for benchmarking
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$ ./test.sh
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```
## Usage
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`$cg_clif_dir` is the directory you cloned this repo into in the following instruction.
### Rustc
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```bash
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$ rustc -Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/debug/librustc_codegen_cranelift.so --sysroot $cg_clif_dir/build_sysroot/sysroot my_crate.rs
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```
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### Cargo
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```bash
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$ RUSTFLAGS="-Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/debug/librustc_codegen_cranelift.dylib --sysroot $cg_clif_dir/build_sysroot/sysroot" cargo run
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```
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## Not yet supported
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* Good non-rust abi support ([vectors are passed by-ref](https://github.com/bjorn3/rustc_codegen_cranelift/issues/10))
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* Checked binops ([some missing instructions in cranelift](https://github.com/CraneStation/cranelift/issues/460))
* Inline assembly ([no cranelift support](https://github.com/CraneStation/cranelift/issues/444))
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* SIMD ([tracked here](https://github.com/bjorn3/rustc_codegen_cranelift/issues/171))
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## Troubleshooting
### Can't compile
Try updating your nightly compiler. You can try to use an nightly a day or two older if updating rustc doesn't fix it. If you still can't compile it, please fill an issue.
