1 # WIP Cranelift codegen backend for rust
3 > ⚠⚠⚠ Threads and certain kinds of FFI don't work yet. ⚠⚠⚠
8 $ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
9 $ cd rustc_codegen_cranelift
10 $ ./prepare.sh # download and patch sysroot src and install hyperfine for benchmarking
16 `$cg_clif_dir` is the directory you cloned this repo into in the following instruction.
21 $ $cg_clif_dir/cargo.sh run
27 $ rustc -Cpanic=abort -Zcodegen-backend=$cg_clif_dir/target/debug/librustc_codegen_cranelift.so --sysroot $cg_clif_dir/build_sysroot/sysroot my_crate.rs
33 * Good non-rust abi support ([several problems](https://github.com/bjorn3/rustc_codegen_cranelift/issues/10))
34 * Checked binops ([some missing instructions in cranelift](https://github.com/CraneStation/cranelift/issues/460))
35 * Inline assembly ([no cranelift support](https://github.com/CraneStation/cranelift/issues/444), not coming soon)
36 * SIMD ([tracked here](https://github.com/bjorn3/rustc_codegen_cranelift/issues/171), some basic things work)
42 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.