pip installs a wheel even if --no-binary is given

[paugier]

Description

I like to install mpi4py with a new build (without using a wheel already locally built). I try to use --no-binary mpi4py but surprisingly a wheel is used.

(venv-mpi4py) [egi2153] augier@login2:~$ CC=mpicc pip install mpi4py --no-binary mpi4py
Looking in indexes: https://gorgone.cines.fr//root/pypi/+simple/
Collecting mpi4py
  Using cached mpi4py-4.0.0-cp311-cp311-linux_x86_64.whl
Installing collected packages: mpi4py
Successfully installed mpi4py-4.0.0

Note that there is a pip config file:

$ cat /etc/pip.conf
[global]
index-url=https://gorgone.cines.fr//root/pypi/+simple/
trusted-host=gorgone.cines.fr

Expected behavior

mpi4py should be compiled from source when --no-binary mpi4py is given.

See the help message:

  --no-binary <format_control>
                              Do not use binary packages. [...]

pip version

pip 24.2

Python version

3.11

OS

Linux

How to Reproduce

python -m venv venv-mpi4py
.  ~/venv-mpi4py/bin/activate
pip install --upgrade pip
pip install mpi4py --no-binary mpi4py

Output

$ pip install mpi4py --no-binary mpi4py
Looking in indexes: https://gorgone.cines.fr//root/pypi/+simple/
Collecting mpi4py
  Using cached mpi4py-4.0.0-cp311-cp311-linux_x86_64.whl
Installing collected packages: mpi4py
Successfully installed mpi4py-4.0.0

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