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Draft: Support for drivers in Rust

Ben Hutchings requested to merge benh/linux:rust into debian/latest

Some preparatory changes:

  • Add 'c_' prefix to compiler configuration field and variables
  • module: Disable MODVERSIONS: no longer needed and complicates Rust support

Infrastructure changes for building (or not building) Rust code:

  • Implement configuration for Rust compiler and other build-dependencies
  • d/rules.real: Set KRUSTFLAGS and HOSTRUSTFLAGS to make filenames relative

Configuration changes to enable it and the currently useful drivers:

  • [amd64,arm64,armhf,loong64,riscv64] Enable building Rust modules
  • Enable Rust PHY drivers and their dependencies

Support for building OOT drivers:

  • kbuild: Look for target.json under arch directory too
  • WIP: linux-headers: Include Rust support files and Recommend rustc
  • d/tests/headers-kbuild: Add trivial Rust module

OOT drivers can only be built on the same architecture as was used for src:linux. I have some local changes to ship Rust sources instead of the build-arch-dependent *.rmeta and *.so files, but that doesn't work (yet).

Edited by Ben Hutchings

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