linux-kernel - Re: [PATCH v5 3/4] rust: add a Kconfig function to test for support of bindgen options

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Message-ID: <9687109b-dc93-4535-848c-e5f22aeb8e9d@gmail.com>
Date: Thu, 4 Dec 2025 20:33:22 +0800
From: Asuna Yang <spriteovo@...il.com>
To: Vivian Wang <wangruikang@...as.ac.cn>,
 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>, Jason Montleon <jmontleo@...hat.com>,
 Han Gao <rabenda.cn@...il.com>, Conor Dooley <conor@...nel.org>
Cc: 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 v5 3/4] rust: add a Kconfig function to test for support
 of bindgen options

On 12/4/25 5:06 PM, Vivian Wang wrote:

>> +
>> +# $(bindgen-backend-option,<flag>)
>> +# Return y if bindgen backend supports <flag>, n otherwise
>> +# For now, the backend refers only to libclang, so more specifically, this function tests whether the given flag is recognized by the libclang used by bindgen.
>> +bindgen-backend-option = $(success,trap "rm -f .tmp_$$.h" EXIT; touch .tmp_$$.h; $(BINDGEN) .tmp_$$.h -- --target=$(BINDGEN_TARGET) $(1))
>>
> Can probably be simplified down to:
> 
> $(BINDGEN) /dev/null -- -x c --target=$(BINDGEN_TARGET) $(1)
> 

bindgen is sensitive to file extensions. If the file is not .h or .hpp, 
it complains:

panicked at bindgen/ir/context.rs:562:15:
libclang error; possible causes include:
- Invalid flag syntax
- Unrecognized flags
- Invalid flag arguments
- File I/O errors
- Host vs. target architecture mismatch