mirror of
https://github.com/rust-lang/rust.git
synced 2024-12-01 19:23:50 +00:00
125 lines
4.4 KiB
Markdown
125 lines
4.4 KiB
Markdown
# Cranelift codegen backend for rust
|
|
|
|
The goal of this project is to create an alternative codegen backend for the rust compiler based on [Cranelift](https://github.com/bytecodealliance/wasmtime/blob/main/cranelift).
|
|
This has the potential to improve compilation times in debug mode.
|
|
If your project doesn't use any of the things listed under "Not yet supported", it should work fine.
|
|
If not please open an issue.
|
|
|
|
## Download using Rustup
|
|
|
|
The Cranelift codegen backend is distributed in nightly builds on Linux and x86_64 macOS. If you want to
|
|
install it using Rustup, you can do that by running:
|
|
|
|
```bash
|
|
$ rustup component add rustc-codegen-cranelift-preview --toolchain nightly
|
|
```
|
|
|
|
Once it is installed, you can enable it with one of the following approaches:
|
|
- `CARGO_PROFILE_DEV_CODEGEN_BACKEND=cranelift cargo +nightly build -Zcodegen-backend`
|
|
- Add the following to `.cargo/config.toml`:
|
|
```toml
|
|
[unstable]
|
|
codegen-backend = true
|
|
|
|
[profile.dev]
|
|
codegen-backend = "cranelift"
|
|
```
|
|
- Add the following to `Cargo.toml`:
|
|
```toml
|
|
# This line needs to come before anything else in Cargo.toml
|
|
cargo-features = ["codegen-backend"]
|
|
|
|
[profile.dev]
|
|
codegen-backend = "cranelift"
|
|
```
|
|
|
|
## Precompiled builds
|
|
|
|
You can also download a pre-built version from the [releases] page.
|
|
Extract the `dist` directory in the archive anywhere you want.
|
|
If you want to use `cargo clif build` instead of having to specify the full path to the `cargo-clif` executable, you can add the `bin` subdirectory of the extracted `dist` directory to your `PATH`.
|
|
(tutorial [for Windows](https://stackoverflow.com/a/44272417), and [for Linux/MacOS](https://unix.stackexchange.com/questions/26047/how-to-correctly-add-a-path-to-path/26059#26059)).
|
|
|
|
[releases]: https://github.com/rust-lang/rustc_codegen_cranelift/releases/tag/dev
|
|
|
|
## Building and testing
|
|
|
|
If you want to build the backend manually, you can download it from GitHub and build it yourself:
|
|
|
|
```bash
|
|
$ git clone https://github.com/rust-lang/rustc_codegen_cranelift
|
|
$ cd rustc_codegen_cranelift
|
|
$ ./y.sh prepare
|
|
$ ./y.sh build
|
|
```
|
|
|
|
To run the test suite replace the last command with:
|
|
|
|
```bash
|
|
$ ./test.sh
|
|
```
|
|
|
|
For more docs on how to build and test see [build_system/usage.txt](build_system/usage.txt) or the help message of `./y.sh`.
|
|
|
|
## Platform support
|
|
|
|
|OS \ architecture|x86\_64|AArch64|Riscv64|s390x (System-Z)|
|
|
|---|---|---|---|---|
|
|
|Linux|✅|✅|✅[^no-rustup]|✅[^no-rustup]|
|
|
|FreeBSD|✅[^no-rustup]|❓|❓|❓|
|
|
|AIX|❌[^xcoff]|N/A|N/A|❌[^xcoff]|
|
|
|Other unixes|❓|❓|❓|❓|
|
|
|macOS|✅|✅|N/A|N/A|
|
|
|Windows|✅|❌|N/A|N/A|
|
|
|
|
✅: Fully supported and tested
|
|
❓: Maybe supported, not tested
|
|
❌: Not supported at all
|
|
|
|
Not all targets are available as rustup component for nightly. See notes in the platform support matrix.
|
|
|
|
[^xcoff]: XCOFF object file format is not supported.
|
|
[^no-rustup]: Not available as rustup component for nightly. You can build it yourself.
|
|
|
|
## Usage
|
|
|
|
rustc_codegen_cranelift can be used as a near-drop-in replacement for `cargo build` or `cargo run` for existing projects.
|
|
|
|
Assuming `$cg_clif_dir` is the directory you cloned this repo into and you followed the instructions (`y.sh prepare` and `y.sh build` or `test.sh`).
|
|
|
|
In the directory with your project (where you can do the usual `cargo build`), run:
|
|
|
|
```bash
|
|
$ $cg_clif_dir/dist/cargo-clif build
|
|
```
|
|
|
|
This will build your project with rustc_codegen_cranelift instead of the usual LLVM backend.
|
|
|
|
For additional ways to use rustc_codegen_cranelift like the JIT mode see [usage.md](docs/usage.md).
|
|
|
|
## Building and testing with changes in rustc code
|
|
|
|
See [rustc_testing.md](docs/rustc_testing.md).
|
|
|
|
## Not yet supported
|
|
|
|
* SIMD ([tracked here](https://github.com/rust-lang/rustc_codegen_cranelift/issues/171), `std::simd` fully works, `std::arch` is partially supported)
|
|
* Unwinding on panics ([no cranelift support](https://github.com/bytecodealliance/wasmtime/issues/1677), `-Cpanic=abort` is enabled by default)
|
|
|
|
## License
|
|
|
|
Licensed under either of
|
|
|
|
* Apache License, Version 2.0 ([LICENSE-APACHE](LICENSE-APACHE) or
|
|
http://www.apache.org/licenses/LICENSE-2.0)
|
|
* MIT license ([LICENSE-MIT](LICENSE-MIT) or
|
|
http://opensource.org/licenses/MIT)
|
|
|
|
at your option.
|
|
|
|
### Contribution
|
|
|
|
Unless you explicitly state otherwise, any contribution intentionally submitted
|
|
for inclusion in the work by you shall be dual licensed as above, without any
|
|
additional terms or conditions.
|