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python-packages: Disable parallel build when host pip is needed

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This adds PKG_BUILD_PARALLEL:=0 to packages that depend on host Python
packages (HOST_PYTHON3_PACKAGE_BUILD_DEPENDS), because installing
packages with multiple concurrent pip processes can lead to errors or
unexpected results[1].

This also:

* Move HOST_PYTHON3_PACKAGE_BUILD_DEPENDS definitions to before
  python3-package.mk is included

* Update Python folder readme to include PKG_BUILD_PARALLEL:=0

[1]: https://github.com/pypa/pip/issues/2361

Signed-off-by: Jeffery To <jeffery.to@gmail.com>
This commit is contained in:
Jeffery To
2020-06-30 04:41:15 +08:00
parent 811ff39de5
commit e0e2224f8a
12 changed files with 33 additions and 20 deletions
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lang/python/README.md
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@@ -332,8 +332,11 @@ These can be installed via pip and ideally they should only be installed like th
Which is why [for example] if you need python cffi on the host build, it's easier to just add it via:
```
PKG_BUILD_PARALLEL:=0
HOST_PYTHON3_PACKAGE_BUILD_DEPENDS:="cffi==$(PKG_VERSION)"
```
[cffi is one of those packages that needs a host-side package installed].
This works reasonably well in the current OpenWrt build system, as binaries get built for this package and get installed in the staging-dir `$(STAGING_DIR)/usr/lib/pythonX.Y/site-packages`.
`PKG_BUILD_PARALLEL:=0` is necessary because installing packages with multiple concurrent pip processes can lead to [errors or unexpected results](https://github.com/pypa/pip/issues/2361).