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: <874inucb6g.fsf@posteo.net>
Date: Fri, 06 Feb 2026 12:24:15 +0000
From: Charalampos Mitrodimas <charmitro@...teo.net>
To: Asuna Yang <xinrui.riscv@...c.iscas.ac.cn>
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

Asuna Yang <xinrui.riscv@...c.iscas.ac.cn> writes:

> 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.

Understood. Seems not worth it at all.

>
> Best regards,
> Asuna