linux-kernel - Re: [PATCH v6 4/4] RISC-V: handle extension configs for bindgen, re-enable gcc + rust builds

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Message-ID: <9323714a-b15f-4616-a525-780accf33b52@isrc.iscas.ac.cn>
Date: Fri, 6 Feb 2026 20:13:52 +0800
From: Asuna Yang <xinrui.riscv@...c.iscas.ac.cn>
To: Charalampos Mitrodimas <charmitro@...teo.net>
Cc: Nathan Chancellor <nathan@...nel.org>, Nicolas Schier <nsc@...nel.org>,
 Miguel Ojeda <ojeda@...nel.org>, Boqun Feng <boqun.feng@...il.com>,
 Gary Guo <gary@...yguo.net>, Björn Roy Baron
 <bjorn3_gh@...tonmail.com>, Benno Lossin <lossin@...nel.org>,
 Andreas Hindborg <a.hindborg@...nel.org>, Alice Ryhl <aliceryhl@...gle.com>,
 Trevor Gross <tmgross@...ch.edu>, Danilo Krummrich <dakr@...nel.org>,
 Nick Desaulniers <nick.desaulniers+lkml@...il.com>,
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>,
 Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
 Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
 Jonathan Corbet <corbet@....net>, Conor Dooley <conor@...nel.org>,
 Mingcong Bai <jeffbai@...c.io>, Han Gao <rabenda.cn@...il.com>,
 Vivian Wang <wangruikang@...as.ac.cn>, Jason Montleon <jmontleo@...hat.com>,
 linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org,
 rust-for-linux@...r.kernel.org, llvm@...ts.linux.dev,
 linux-riscv@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v6 4/4] RISC-V: handle extension configs for bindgen,
 re-enable gcc + rust builds

On 1/29/26 21:49, Charalampos Mitrodimas wrote:

> I'm under the impression that the `!RUST ||` guard here doesn't
> actually prevent the `$(bindgen-backend-option,...)` call from being
> executed. `$(...)` shell expansions should happen during the textual
> substitution phase, before symbol dependency evaluation occurs, check
> documentation at kconfig-macro-language.rst lines 228-229.

I suppose this is unavoidable if we decide to probe options rather than 
rely on version numbers.

Similar issue also occurs in `cc-option`, for example:

	depends on !64BIT || $(cc-option,-mabi=lp64 -march=rv64imv)
	depends on !32BIT || $(cc-option,-mabi=ilp32 -march=rv32imv)

For 64-bit builds, `-march=rv32imv` will still be probed; for 32-bit 
builds, `-march=rv64imv` will still be probed.

I agree with Nathan that this trivial waste is worth it for the sake of 
simplicity.

Best regards,
Asuna