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anki/docs/new-platform.md
Damien Elmes 2e7213f8b0 add some porting notes
2020-12-31 14:03:38 +10:00

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Building on a new platform

Upstream prerequisites

  • A recent Qt, PyQt5 and PyQtWebEngine must work on your platform. Chances are wheels for your platform are not available on PyPI, so you will need to have a working version installed already, either from your Linux distro's archives, or by building from source.
  • Rust and Node must support your platform.

32 bit builds

Bazel does not support running on a 32-bit host. It may be theoretically possible to cross-compile from a 64-bit host, but this is not something we've tried, and it will likely not work out of the box.

Protobuf & Python

  • Edit /platforms/BUILD.bzl and add the new platform. Available platforms and CPUs can be found here: https://github.com/bazelbuild/platforms
  • Edit /protobuf.bzl and add the new platform and a link to a protoc binary.
  • Edit /pylib/anki/BUILD.bazel and add the new platform and the relevant Python wheel name for your platform.

Example of the above changes: db3308e788

  • We need to tell the build process to use your local PyQt5 install, instead of fetching it from PyPI. Locate your Python site-packages folder where the PyQt5 folder is, and add the following to user.bazelrc in the project folder root:
build --action_env=PYTHON_SITE_PACKAGES=/path/to/site-packages
  • Anki uses the Python 'orjson' module. If it's not available on your system, you will need to patch it out, and remove references to it in the build scripts.

Rust

  • Ensure you have Rust installed (eg via rustup)
  • Edit /Cargo.toml in this project, and add your platform to the targets. Check that the platform is supported by rules_rust; if it is not, you'll need to send a PR to them adding it. You can test your change locally by modifying /repos.bzl in this project to point to a local rules_rust checkout.
  • Edit /cargo/BUILD.request.bazel and add the new platform.
  • Run update.py in the /cargo folder.

Examples of the required changes:

NodeJS

If you node don't provide a binary for your platform and you have a local copy installed, you may be able to modify node_repositories() in /defs.bzl to point to your local npm installation.

Submitting changes

If the changes to support your platform do not require platform-specific hacks, a PR that adds them is welcome - please see Contributing for more.