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add documentation on cross compiling

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Matt Pelland 2019-01-23 23:10:37 -05:00
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@ -27,6 +27,18 @@ E.g. if you are on Ubuntu18.04, please run
sudo apt install python3-dev python-dev
```
### Cross Compiling
Cross compiling Pyo3 modules requires setting the following environment
variables:
- `PYO3_XC`: This variable must be set to indicate a cross compilation
environment. The value does not matter.
- `PYO3_XC_PYTHON_INCLUDE_DIR`: This variable must be set to the directory
containing the headers for the target's python interpreter.
- `PYO3_XC_PYTHON_LIB_DIR`: This variable must be set to the directory
containing the target's libpython DSO.
## Using rust from python
Pyo3 can be used to generate a native python module.