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Added build instructions for cranelift backend as part of Rust repo

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All other instructions assume that user works with separate repository than Rust compiler repository. When one follows default instructions, cranelift codegen tries to use different sys-root and compiler internal crates which leads to compiler errors when building it.

I needed to do all this steps while adding new intrinsic to rustc.
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AngelicosPhosphoros 2023-05-21 21:53:02 +04:00 committed by AngelicosPhosphoros
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@ -42,6 +42,32 @@ This will build your project with rustc_codegen_cranelift instead of the usual L
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
This is useful when changing code in `rustc_codegen_cranelift` as part of changing [main Rust repository](https://github.com/rust-lang/rust/).
This can happen, for example, when you are implementing a new compiler intrinsic.
Instruction below uses `$RustCheckoutDir` as substitute for any folder where you cloned Rust repository.
You need to do this steps to successfully compile and use the cranelift backend with your changes in rustc code:
1. `cd $RustCheckoutDir`
2. Run `python x.py setup` and choose option for compiler (`b`).
3. Build compiler and necessary tools: `python x.py build --stage=2 compiler library/std src/tools/rustdoc src/tools/rustfmt`
* (Optional) You can also build cargo by adding `src/tools/cargo` to previous command.
4. Copy exectutable files from `./build/host/stage2-tools/<your hostname triple>/release`
to `./build/host/stage2/bin/`. Note that you would need to do this every time you rebuilt `rust` repository.
5. Copy cargo from another toolchain: `cp $(rustup which cargo) .build/<your hostname triple>/stage2/bin/cargo`
* Another option is to build it at step 3 and copy with other executables at step 4.
6. Link your new `rustc` to toolchain: `rustup toolchain link stage2 ./build/host/stage2/`.
7. (Windows only) compile y.rs: `rustc +stage2 -O y.rs`.
8. You need to prefix every `./y.rs` (or `y` if you built `y.rs`) command by `rustup run stage2` to make cg_clif use your local changes in rustc.
* `rustup run stage2 ./y.rs prepare`
* `rustup run stage2 ./y.rs build`
* (Optional) run tests: `rustup run stage2 ./y.rs test`
9. Now you can use your cg_clif build to compile other Rust programs, e.g. you can open any Rust crate and run commands like `$RustCheckoutDir/compiler/rustc_codegen_cranelift/dist/cargo-clif build --release`.
## Configuration
See the documentation on the `BackendConfig` struct in [config.rs](src/config.rs) for all