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https://github.com/mayeut/manylinux-ubuntu


https://github.com/mayeut/manylinux-ubuntu

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README 

        
# manylinux-ubuntu



This is only a PoC that serves multiple purposes:

- experiment with multiarchitecture images in GHA

- provide a path to build armv7l manylinux wheels

- provide a path to build riscv64 manylinux wheels



## Why this won't be part of [pypa/manylinux](https://github.com/pypa/manylinux) as a whole



If you're building manylinux wheels for `x86_64`, `aarch64`, `ppc64le` or `s390x` then,

the already existing images based on RHEL derivatives are better suited for the job.

They do provide compatibility with older systems while providing a recent gcc toolchain.

As an example, the manylinux_2_28 image that ensure built wheels will run on glibc 2.28+ systems

currently provides a gcc 13 toolchain. A manylinux_2_35 image based on Ubuntu 22.04 would only ensure

compatibility with more recent glibc 2.35+ systems while providing an older gcc 11 toolchain.



This [linked issue](https://github.com/pypa/manylinux/issues/1012) has more information about this.



## Path to build `armv7l` manylinux wheels



`armv7l` is still used nowadays, for example on [Raspberry Pi](https://www.raspberrypi.com/).

There are no RHEL derivatives for this architecture that would allow for "old systems with a recent toolchain" out-of-the-box.



As such, one way forward is to have a Debian derivative image that allows building manylinux wheels for this architecture.

This comes with some caveats:

- in order to achieve compatibility with "older" systems, you get an older toolchain:

    - gcc9 on Ubuntu 20.04 (manylinux_2_31 wheels compatible with Ubuntu 20.04+, Debian 11+)

    - gcc11 on Ubuntu 22.04 (manylinux_2_35 wheels compatible with Ubuntu 22.04+, Debian 12+)

- the package manager & packages names are different than what is found on [pypa/manylinux](https://github.com/pypa/manylinux) images:

  [pypa/manylinux](https://github.com/pypa/manylinux) images are using RHEL derivatives only for now so using `yum`/`dnf` as a package manager and

  RHEL like packages names while images here are using `apt` and Debian like packages names.

  If one depends on let's say OpenSSL development package, then, the commands to issue to install it are a bit different:

    - `dnf -y install openssl-devel` on RHEL derivatives

    - `apt-get update && apt-get install -y libssl-dev` on Debian derivatives



An experiment has been proposed in [pypa/cibuildwheel](https://github.com/pypa/cibuildwheel/pull/2052) using the `manylinux_2_31` image

from this repository as a first step towards supporting `armv7l` manylinux wheel building.



If the experiment proves successful, a specific `armv7l` image will be added in [pypa/manylinux](https://github.com/pypa/manylinux/pull/1699).