This is one of a series of deprecations meant to collect feedback on the ultimate goal of always installing source distributions by first building a wheel and then installing from it.
If you're seeing this error, it's a symptom of either:
A package failing to build. Scroll up in the output to see if "Building wheel" failed for the same package. If yes, then you want to investigate that issue and not this warning.
Or, wheel not being installed in your environment.
If you're a user, install that package in the environment to avoid hitting this issue.
If you're the package author, make sure you can install the package with --use-pep517 passed into pip.
This specific issue is about the case when pip has to call setup.py bdist_wheel because the wheel package is not installed.
In that case, pip currently displays deprecation warning and continues installation by attempting a setup.py install.
In a future version, pip will ~either (to be decided)~:
~fail right away~
~attempt setup.py bdist_wheel and let that fail (the error message might be unclear in that case)~
attempt an isolated build in PEP 517 mode with the default build system
The recommended way to silence this warning is to enable the --use-pep517 flag, which will in turn install setuptools and wheel in an isolated environment where it will attempt to build a wheel and install it.
This is one of a series of deprecations meant to collect feedback on the ultimate goal of always installing source distributions by first building a wheel and then installing from it.
If you're seeing this error, it's a symptom of either:
Or,
wheelnot being installed in your environment.If you're a user, install that package in the environment to avoid hitting this issue.
If you're the package author, make sure you can install the package with
--use-pep517passed into pip.This specific issue is about the case when pip has to call setup.py bdist_wheel because the
wheelpackage is not installed. In that case, pip currently displays deprecation warning and continues installation by attempting a setup.py install.In a future version, pip will ~either (to be decided)~:
setup.py bdist_wheeland let that fail (the error message might be unclear in that case)~The recommended way to silence this warning is to enable the
--use-pep517flag, which will in turn installsetuptoolsandwheelin an isolated environment where it will attempt to build a wheel and install it.Towards #8102