Re: [Buildroot] [RFC PATCH 5/5] linux: Add Rust support

[Thomas Petazzoni via buildroot <buildroot@buildroot.org>]

On Fri, Aug 08, 2025 at 03:31:12PM +0200, El Mehdi YOUNES via buildroot wrote:

> +ifeq ($(BR2_LINUX_KERNEL_RUST_SUPPORT),y)
> +LINUX_DEPENDENCIES += host-rustc host-rust-bindgen
> +LINUX_MAKE_FLAGS += \
> +	RUSTC=$(HOST_DIR)/bin/rustc \
> +	BINDGEN=$(HOST_DIR)/bin/bindgen \
> +	RUST_LIB_SRC=$(HOST_DIR)/lib/rustlib/src/rust/library \

You'll have to update this to $(HOST_DIR)/src/rust if that ends up
working (see our comments on PATCH 2/5).

Make sure to test this with both pre-compiled Rust compiler and
compiled-from-source Rust compiler.

And finally, we would like to have a test in support/testing/ to
verify that this continues to work. You don't need a test that boots
the kernel, but at least something that builds the kernel with Rust
support. Of course if there's some HW-agnostic kernel feature in Rust
that we can test in Qemu, it would be nice. Maybe binder? But I'm not
sure how to use it under a pure Linux system. But don't spend too much
time on this: a compile-time only test will be good enough.

Thanks a lot!

Thomas
-- 
Thomas Petazzoni, co-owner and CEO, Bootlin
Embedded Linux and Kernel engineering and training
https://bootlin.com
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