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<main>
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<h1 id="installation"><a class="header" href="#installation">Installation</a></h1>
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<p>In the near future, <code>std::autodiff</code> should become available in nightly builds for users. As a contributor however, you will still need to build rustc from source. Please be aware that the msvc target is not supported at the moment, all other tier 1 targets should work. Please open an issue if you encounter any problems on a supported tier 1 target, or if you successfully build this project on a tier2/tier3 target.</p>
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<h2 id="build-instructions"><a class="header" href="#build-instructions">Build instructions</a></h2>
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<p>First you need to clone and configure the Rust repository:</p>
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<pre><code class="language-bash">git clone --depth=1 git@github.com:rust-lang/rust.git
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cd rust
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./configure --enable-llvm-link-shared --enable-llvm-plugins --enable-llvm-enzyme --release-channel=nightly --enable-llvm-assertions --enable-clang --enable-lld --enable-option-checking --enable-ninja --disable-docs
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</code></pre>
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<p>Afterwards you can build rustc using:</p>
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<pre><code class="language-bash">./x.py build --stage 1 library
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</code></pre>
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<p>Afterwards rustc toolchain link will allow you to use it through cargo:</p>
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<pre><code>rustup toolchain link enzyme build/host/stage1
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rustup toolchain install nightly # enables -Z unstable-options
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</code></pre>
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<p>You can then run our test cases:</p>
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<pre><code class="language-bash">./x.py test --stage 1 tests/codegen/autodiff
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./x.py test --stage 1 tests/pretty/autodiff
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./x.py test --stage 1 tests/ui/autodiff
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./x.py test --stage 1 tests/ui/feature-gates/feature-gate-autodiff.rs
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</code></pre>
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<p>Autodiff is still experimental, so if you want to use it in your own projects, you will need to add <code>lto="fat"</code> to your Cargo.toml
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and use <code>RUSTFLAGS="-Zautodiff=Enable" cargo +enzyme</code> instead of <code>cargo</code> or <code>cargo +nightly</code>.</p>
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<h2 id="compiler-explorer-and-dist-builds"><a class="header" href="#compiler-explorer-and-dist-builds">Compiler Explorer and dist builds</a></h2>
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<p>Our compiler explorer instance can be updated to a newer rustc in a similar way. First, prepare a docker instance.</p>
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<pre><code class="language-bash">docker run -it ubuntu:22.04
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export CC=clang CXX=clang++
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apt update
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apt install wget vim python3 git curl libssl-dev pkg-config lld ninja-build cmake clang build-essential
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</code></pre>
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<p>Then build rustc in a slightly altered way:</p>
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<pre><code class="language-bash">git clone --depth=1 https://github.com/rust-lang/rust.git
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cd rust
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./configure --enable-llvm-link-shared --enable-llvm-plugins --enable-llvm-enzyme --release-channel=nightly --enable-llvm-assertions --enable-clang --enable-lld --enable-option-checking --enable-ninja --disable-docs
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./x dist
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</code></pre>
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<p>We then copy the tarball to our host. The dockerid is the newest entry under <code>docker ps -a</code>.</p>
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<pre><code class="language-bash">docker cp <dockerid>:/rust/build/dist/rust-nightly-x86_64-unknown-linux-gnu.tar.gz rust-nightly-x86_64-unknown-linux-gnu.tar.gz
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</code></pre>
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<p>Afterwards we can create a new (pre-release) tag on the EnzymeAD/rust repository and make a PR against the EnzymeAD/enzyme-explorer repository to update the tag.
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Remember to ping <code>tgymnich</code> on the PR to run his update script. Note: We should archive EnzymeAD/rust and update the instructions here. The explorer should soon
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be able to get the rustc toolchain from the official rust servers.</p>
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<h2 id="build-instruction-for-enzyme-itself"><a class="header" href="#build-instruction-for-enzyme-itself">Build instruction for Enzyme itself</a></h2>
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<p>Following the Rust build instruction above will build LLVMEnzyme, LLDEnzyme, and ClangEnzyme along with the Rust compiler.
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We recommend that approach, if you just want to use any of them and have no experience with cmake.
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However, if you prefer to just build Enzyme without Rust, then these instructions might help.</p>
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<pre><code class="language-bash">git clone --depth=1 git@github.com:llvm/llvm-project.git
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cd llvm-project
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mkdir build
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cd build
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cmake -G Ninja ../llvm -DLLVM_TARGETS_TO_BUILD="host" -DLLVM_ENABLE_ASSERTIONS=ON -DLLVM_ENABLE_PROJECTS="clang;lld" -DLLVM_ENABLE_RUNTIMES="openmp" -DLLVM_ENABLE_PLUGINS=ON -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=.
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ninja
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ninja install
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</code></pre>
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<p>This gives you a working LLVM build, now we can continue with building Enzyme.
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Leave the <code>llvm-project</code> folder, and execute the following commands:</p>
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<pre><code class="language-bash">git clone git@github.com:EnzymeAD/Enzyme.git
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cd Enzyme/enzyme
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mkdir build
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cd build
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cmake .. -G Ninja -DLLVM_DIR=<YourLocalPath>/llvm-project/build/lib/cmake/llvm/ -DLLVM_EXTERNAL_LIT=<YourLocalPath>/llvm-project/llvm/utils/lit/lit.py -DCMAKE_BUILD_TYPE=Release -DCMAKE_EXPORT_COMPILE_COMMANDS=YES -DBUILD_SHARED_LIBS=ON
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ninja
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</code></pre>
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<p>This will build Enzyme, and you can find it in <code>Enzyme/enzyme/build/lib/<LLD/Clang/LLVM>Enzyme.so</code>. (Endings might differ based on your OS).</p>
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