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LLVM Propeller\n\nPropeller is a profile-guided, relinking optimizer for warehouse-scale\napplications. It is built on top of LLVM and provides a framework for computing\nwhole-program optimizations for applications built with LLVM.\n\n_For artifact evaluation, see [ArtifactEvaluation/README.md](ArtifactEvaluation/README.md)_\n\n## Quickstart\n\n### Prerequisites and dependencies\n\n| Operating System | Version  |\n| --- | --- |\n| Ubuntu | 22.04 or newer |\n\nWhile the Propeller build system automatically pulls in most of its dependencies,\nyou will need to install a few packages manually:\n\n```\n# Common dependencies\nsudo apt install -y wget lsb-release software-properties-common gnupg\n\n# Propeller builds with Clang 19.0.0 or newer.\nwget https://apt.llvm.org/llvm.sh\nchmod +x llvm.sh\nsudo ./llvm.sh 19\nexport CC=clang-19\nexport CXX=clang++-19\n\n# For the CMake build\nsudo apt-get update \u0026\u0026 sudo apt-get install -y \\\n    libelf-dev \\\n    libssl-dev \\\n    libzstd-dev\n```\n\n### Building Propeller from source\n\nThe Propeller repository provides both CMake and Bazel build configurations.\nThe CMake build requires CMake 3.24 or newer, and the Bazel build requires\nBazel 5.0 or newer.\n\n#### CMake\n```\ncmake -G Ninja -B build\nninja -C build generate_propeller_profiles\n\n# Build and run tests (optional)\nninja -C build\nninja -C build test\n```\n\n#### Bazel\n```\nbazel build //propeller:generate_propeller_profiles\n\n# Build and run tests (optional)\nbazel test //propeller/...:all\n```\n\n### Generating a Propeller profile\n```\n./generate_propeller_profiles \\\n    --binary=/path/to/profiled/binary \\\n    --profile=/path/to/input/profile.txt \\\n    --cc_profile=/path/to/out/cc_profile.txt \\\n    --ld_profile=/path/to/out/ld_profile.txt\n```\n\nPropeller generates compiler profiles (`cc_profile.txt`) and linker profiles\n(`ld_profile.txt`). The compiler profile is used by LLVM to guide optimizations\nand is described in [Propeller Profile Format](propeller_profile_format.md).\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgoogle%2Fllvm-propeller","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgoogle%2Fllvm-propeller","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgoogle%2Fllvm-propeller/lists"}