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How to build ONNX python package from source with uv (2025/12)

ONNX uv Build 
mkdir onnx-work
cd onnx-work
git clone https://github.com/onnx/onnx --recursive
uv venv
uv pip install -r onnx/requirements-dev.txt
uv pip install cmake ninja
uv pip install --editable ./onnx \
  --config-setting editable-mode=compat \
  --config-settings=cmake.args="-G Ninja;-DCMAKE_BUILD_TYPE=RelWithDebInfo;-DCMAKE_C_COMPILER_LAUNCHER=ccache;-DCMAKE_CXX_COMPILER_LAUNCHER=ccache" \
  --verbose --no-build-isolation