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26 lines
761 B
Markdown
26 lines
761 B
Markdown
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## I see the `pyo3` crate constantly rebuilding
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The `pyo3` crate uses checks `$PYO3_PYTHON` for a path to the `python` binary it
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should use during the build. If this environment variable is not set, `pyo3`
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will look for whatever version of `python` is on the `$PATH`, which
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unfortunately results in the crate being rebuilt when `$PATH` changes (i.e.
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whenever the cargo artifacts are used in a derivation which may have different
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build inputs).
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The way to remedy this is to explicitly set `PYO3_PYTHON` to point to the
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version of `python` that will be used by the derivation:
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```nix
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let
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chosenPython = pkgs.python3;
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in
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craneLib.buildPackage {
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env.PYO3_PYTHON = "${chosenPython}/bin/python";
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nativeBuildInputs = [
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chosenPython
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];
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# etc...
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}
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```
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