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<main>
<h1 id="installation"><a class="header" href="#installation">Installation</a></h1>
<p><code>std::offload</code> is partly available in nightly builds for users. For now, everyone however still needs to build rustc from source to use all features of it.</p>
<h2 id="build-instructions"><a class="header" href="#build-instructions">Build instructions</a></h2>
<p>First you need to clone and configure the Rust repository:</p>
<pre><code class="language-bash">git clone git@github.com:rust-lang/rust
cd rust
./configure --enable-llvm-link-shared --release-channel=nightly --enable-llvm-assertions --enable-llvm-offload --enable-llvm-enzyme --enable-clang --enable-lld --enable-option-checking --enable-ninja --disable-docs
</code></pre>
<p>Afterwards you can build rustc using:</p>
<pre><code class="language-bash">./x build --stage 1 library
</code></pre>
<p>Afterwards rustc toolchain link will allow you to use it through cargo:</p>
<pre><code>rustup toolchain link offload build/host/stage1
rustup toolchain install nightly # enables -Z unstable-options
</code></pre>
<h2 id="build-instruction-for-llvm-itself"><a class="header" href="#build-instruction-for-llvm-itself">Build instruction for LLVM itself</a></h2>
<pre><code class="language-bash">git clone git@github.com:llvm/llvm-project
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
</code></pre>
<p>This gives you a working LLVM build.</p>
<h2 id="testing"><a class="header" href="#testing">Testing</a></h2>
<p>run</p>
<pre><code>./x test --stage 1 tests/codegen-llvm/gpu_offload
</code></pre>
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