Building ONNX Runtime

The build scripts build.sh (Linux/macOS) and build.bat (Windows) delegate to tools/ci_build/build.py.

Build phases

Three phases, controlled by flags:

• --update — generate CMake build files
• --build — compile (add --parallel to speed this up)
• --test — run tests

For native builds, if none are specified (and --skip_tests is not passed), all three run by default. For cross-compiled builds, the default is --update + --build only.

When to use --update