[paugier]

This PR adds the support for spy build --march=native (and other values). The code is partly IA generated.

An important point is that we need to rebuild libspy with the corresponding -march value since it is built for --release with -flto.

While working on that, I realized that we don't actually need make for such builds. We already use Ninja so it's very easy to use it also to build libspy. I added a Python module spy/libspy/builder.py to do that.

The libspy builds are cached in ~/.cache/spy and I added a mechanism to automatically remove old builds. Moreover, I added a very simple command spy cache clean.

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I also realized that such runtime builds and cache mechanism can be used later (not in this PR)

• to simplify the dev workflow: uv sync/spy/pytest calls take care of the libspy (re)builds and
• to release a sdist and a universal wheel (only containing universal WASM builds, libspy.wasm and libspy.a), installable with for example uv tool install spylang.

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Last Updated: 2026-10-19 08:57 UTC