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initial instructions for gpu offload #2447

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initial instructions for gpu offload #2447

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37 changes: 37 additions & 0 deletions src/offload/installation.md
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# Installation

In the future, `std::offload` should become available in nightly builds for users. For now, everyone still needs to build rustc from source.

## Build instructions

First you need to clone and configure the Rust repository:
```bash
git clone --depth=1 [email protected]:rust-lang/rust.git
cd rust
./configure --enable-llvm-link-shared --release-channel=nightly --enable-llvm-assertions --enable-offload --enable-clang --enable-lld --enable-option-checking --enable-ninja --disable-docs
```

Afterwards you can build rustc using:
```bash
./x.py build --stage 1 library
```

Afterwards rustc toolchain link will allow you to use it through cargo:
```
rustup toolchain link enzyme build/host/stage1
rustup toolchain install nightly # enables -Z unstable-options
```



## Build instruction for LLVM itself
```bash
git clone --depth=1 [email protected]:llvm/llvm-project.git
cd llvm-project
mkdir build
cd build
cmake -G Ninja ../llvm -DLLVM_TARGETS_TO_BUILD="host,AMDGPU,NVPTX" -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_ENABLE_RUNTIMES="offload,openmp" -DLLVM_ENABLE_PLUGINS=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=.
ninja
ninja install
```
This gives you a working LLVM build.