rust/Readme.md

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# Work in progress cranelift codegen backend for rust
> ⚠⚠⚠ This doesn't do anything useful yet ⚠⚠⚠
## Building
```bash
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$ git clone https://github.com/bjorn3/rustc_codegen_cranelift.git
$ cd rustc_codegen_cranelift
$ rustup override set nightly
$ git submodule update --init
$ cargo build
```
## Usage
```bash
$ rustc -Zcodegen-backend=$(pwd)/target/debug/librustc_codegen_cranelift.so my_crate.rs --crate-type lib -Og
```
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## Building libcore
```bash
$ rustup component add rust-src
$ ./prepare_libcore.sh
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$ ./build.sh
```
> ⚠⚠⚠ You will get a panic because of unimplemented stuff ⚠⚠⚠
## Not yet supported
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* Checked binops
* Statics
* Drop glue
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* Building libraries
* Other call abi's
* Unsized types
* Slice indexing
* Sub slice
* Some rvalue's
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* Inline assembly
* Custom sections
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## Known errors
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* cranelift-module api seems to be used wrong, thus causing panic for some consts
* cranelift-codegen doesn't have encodings for some instructions for types smaller than I32