linux-kernel - Re: [PATCH v2 2/3] scripts: generate_rust

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Date: Fri, 23 Feb 2024 15:39:47 +0100
From: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
To: Conor Dooley <conor@...nel.org>
Cc: linux-riscv@...ts.infradead.org, Conor Dooley <conor.dooley@...rochip.com>, 
	Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>, 
	Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>, 
	Björn Roy Baron <bjorn3_gh@...tonmail.com>, 
	Jonathan Corbet <corbet@....net>, Paul Walmsley <paul.walmsley@...ive.com>, 
	Palmer Dabbelt <palmer@...belt.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Tom Rix <trix@...hat.com>, 
	rust-for-linux@...r.kernel.org, linux-doc@...r.kernel.org, 
	linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v2 2/3] scripts: generate_rust_target: enable building on RISC-V

On Fri, Feb 23, 2024 at 2:38 PM Conor Dooley <conor@...nel.org> wrote:
>
> Add the required bits from rust-for-linux to enable generating a RISC-V
> target for rust. The script, written by Miguel, was originally a
> config file contributed by Gary.

Thanks for this Connor!

arm64 is sending these for 6.9:

    https://git.kernel.org/arm64/c/f82811e22b48
    https://git.kernel.org/arm64/c/724a75ac9542

So it would be nice to see if it may be already possible to enable it
via a builtin target + flags instead of the custom target, e.g. arm64
does:

    KBUILD_RUSTFLAGS += --target=aarch64-unknown-none -Ctarget-feature="-neon"

and so on.

If it does not work, it would be good to know what would be needed for
RISC-V and put it into the unstable features / wanted features list
for Rust.

Either way, it is not a blocker (although you will need a rebase after
arm64 lands to use the `target.json` in the right places).

Cheers,
Miguel