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xbps-src: Explain python module dependencies in Manual.md

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Andrew J. Hesford 2020-07-11 13:31:58 -04:00
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@ -1444,9 +1444,18 @@ Python packages should be built with the `python{,2,3}-module` build style, if p
This sets some environment variables required to allow cross compilation. Support to allow
building a python module for multiple versions from a single template is also possible.
To allow cross compilation, the `python-devel` package (for python 2.7) must be added
to `hostmakedepends` and `makedepends`. If any other python version is also supported,
for example python3.4, those must also be added as host and target build dependencies.
Python packages that rely on `python3-setuptools` should generally map `setup_requires`
dependencies in `setup.py` to `hostmakedepends` in the template and `install_requires`
dependencies to `depends` in the template; include `python3` in `depends` if there are no other
python dependencies. If the package includes a compiled extension, the `python3-devel` packages
should be added to `makedepends`, as should any python packages that also provide native libraries
against which the extension will be linked (even if that package is also included in
`hostmakedepends` to satisfy `setuptools`).
**NB**: Python `setuptools` will attempt to use `pip` or `EasyInstall` to fetch any missing
dependencies at build time. If you notice warnings about `EasyInstall` deprecation or python eggs
present in `${wrksrc}/.eggs` after building the package, then those packages should be added to
`hostmakedepends`.
The following variables may influence how the python packages are built and configured
at post-install time: