ARM Support

[tcirstea]

Any plans for supporting ARM?

On a side note, building maturin works, but then fails to be used since this happens:

💥 maturin failed
Caused by: The architecture ARM is not supported

[konstin]

Do you have any documentation or reference wheel for native wheels on arm? From reading the distutils source code the architecture is os.uname().machine, but couldn't find a list of possible values or notes about python support of those architectures. You should also note that everything but x86 also isn't manylinux compatible, so it can't be published as wheel on pypi.

[programmerjake]

If you want, I can build some wheels on my armv7a computer.

[konstin]

A wheel as reference and a sysconfig (python3 -m sysconfig) would definitely be helpful!

[programmerjake]

see also: pypa/manylinux#84

[programmerjake]

I created a wheel for gmpy2 since that doesn't take long.
python3.5-wheel-ubuntu-16.04-on-odroid-xu4.tar.gz

sysconfig included in tarball.

[konstin]

Thanks for those files! So the apparent differences are:

• linux_armv7l instead of linux_x86_64 for the wheel name
• arm-linux-gnueabihf instead of x86_64-linux-gnu for the so name

Both travis ci and github actions support arm, so we could use either for continuous integration.

[programmerjake]

apparently cpython gets the platform name on non-android unix systems from https://github.com/python/cpython/blob/5c0c325453a175350e3c18ebb10cc10c37f9595c/configure.ac#L708-L849
pip gets wheel platform names from https://github.com/pypa/pip/blob/4447cb0fae4b38c12bb1cec2d59bb2a230638145/src/pip/_internal/pep425tags.py#L140-L164

see also PEP 425 and PEP 427

[konstin]

I've tinkered a bit with this and while it's not that difficult to implement, the current Target struct and OS enum should be replaced by Platform enum to avoid this becoming to messy:

pub enum Target {
    Linux { manylinux: Manylinux, arch: Arch},
    Windows {is_64_bit: bool},
    Macos,
    FreeBSD,
}

Target::current() and Target::from_target_triple() should check for unsupported combinations and return understandable errors (and never panic as from_target_triple currently does).

[santteegt]

Hi,

Any updates on supporting ARM architectures? I'm getting The architecture AARCH64 is not supported

[pantunes]

Hi,

Any updates regarding this issue? I get the same error and I'm stuck.

A code fix or/and updates will be highly appreciated.

Thanks

PS - I get this when trying to install in a Raspberry Pi 4 (ARMv8-A) 64-bit with Raspbian 2019-09-26.

[konstin]

It seems that only manylinux2014 added support for armv7l (https://www.python.org/dev/peps/pep-0599/#the-manylinux2014-policy), so it makes sense to require manylinux2014 here.

[ijl]

You can build #273 locally to try.

[konstin]

Fixed by #273 🎉