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[89.208.240.37]) by smtp.gmail.com with ESMTPSA id 00721157ae682-78c1b4d22bbsm4914897b3.21.2025.12.04.04.33.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 04 Dec 2025 04:33:30 -0800 (PST) From: Asuna Yang X-Google-Original-From: Asuna Yang Message-ID: <9687109b-dc93-4535-848c-e5f22aeb8e9d@gmail.com> Date: Thu, 4 Dec 2025 20:33:22 +0800 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 3/4] rust: add a Kconfig function to test for support of bindgen options To: Vivian Wang , Nathan Chancellor , Nicolas Schier , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?Q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Alice Ryhl , Trevor Gross , Danilo Krummrich , Nick Desaulniers , Bill Wendling , Justin Stitt , Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti , Jonathan Corbet , Jason Montleon , Han Gao , Conor Dooley Cc: linux-kbuild@vger.kernel.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, llvm@lists.linux.dev, linux-riscv@lists.infradead.org, linux-doc@vger.kernel.org References: <20251204-gcc-rust-v5-v5-0-2d4f20d86c24@gmail.com> <20251204-gcc-rust-v5-v5-3-2d4f20d86c24@gmail.com> <1a6bb8cd-cc08-458f-a6f6-cdfefd327320@iscas.ac.cn> Content-Language: en-US In-Reply-To: <1a6bb8cd-cc08-458f-a6f6-cdfefd327320@iscas.ac.cn> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit On 12/4/25 5:06 PM, Vivian Wang wrote: >> + >> +# $(bindgen-backend-option,) >> +# Return y if bindgen backend supports , 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