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

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" --verbose