Composer fails to run on linux-arm64 os

[boboldehampsink]

When running composer on ubuntu 22 with arm64 architecture, I see the following error:

composer install --prefer-dist --no-scripts --no-progress --no-interaction --no-autoloader: #0 0.140 qemu-x86_64: Could not open '/lib64/ld-linux-x86-64.so.2': No such file or directory

I know that arm64 isn't officially supported, but it would be nice for me to know if anything in this buildpack is arch-specific (and why it is trying to use qemu) - or that it is my OS that is failing me

[dzuelke]

What Composer? Heroku's builds? That's not a binary; it's run using php due to the shebang. So you're also using Heroku's PHP, I assume?

Is this in Docker?

You have to use FROM --platform=linux/amd64 … or Docker will select an ARM64 image.

[boboldehampsink]

That could've been clearer, sorry. It has to do with heroku/base-images#227 - I'm trying to create an arm64 version of heroku stack docker images, and so far so good. This error occurs when running php/composer from this buildpack in a docker based on that arm64 heroku file. Any idea why that is? Should PHP be compiled specifically for arm64 perhaps?

[dzuelke]

Yeah it's all compiled for only x86_64 at the moment.

[boboldehampsink]

Yeah thought so, no problem! Just trying to think of a way to make the Docker images perform on M1 macs. Its terrible atm.

[boboldehampsink]

Do you maybe have a build script that compiles php the way you do? I could try and run that for ARM to mimic the builds you do.

[boboldehampsink]

Dohh, ofcourse you have, and very well documented as well. Apologies.