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Merge pull request #1550 from ravenexp/arch-env-vars 

Update `build.rs` env vars in Architecture.md
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David Hewitt 2021-04-11 17:31:57 +01:00 committed by GitHub
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@ -159,10 +159,12 @@ PyO3's [`build.rs`](https://github.com/PyO3/pyo3/tree/master/build.rs) is relati
Below is a non-exhaustive list of its functionality:
- Cross-compiling support.
- If `TARGET` architecture and `HOST` architecture differ, we find cross compile information
from environment variables (`PYO3_CROSS_INCLUDE_DIR` and `PYO3_CROSS_PYTHON`) or system files.
from environment variables (`PYO3_CROSS_LIB_DIR` and `PYO3_CROSS_PYTHON_VERSION`) or system files.
- Find the interpreter for build and detect the Python version.
- We have to set some version flags like `Py_37`.
- If the interpreter is PyPy, we set `PyPy`.
- If `PYO3_NO_PYTHON` environment variable is set then the interpreter detection is bypassed
entirely and only abi3 extensions can be built.
- Check if we are building a Python extension.
- If we are building an extension (e.g., Python library installable by `pip`),
we don't link `libpython`.