[PATCH v6 3/4] rust: add a Kconfig function to test for support of bindgen options

[Nathan Chancellor]

On Tue, Dec 30, 2025 at 05:47:56PM +0100, Asuna Yang wrote:
> Add a new `bindgen-backend-option` Kconfig function to test whether the
> bindgen backend supports a given flag.
> 
> A subsequent commit will use this function to test for RISC-V extension
> flags.
> 
> Signed-off-by: Asuna Yang <xinrui.riscv at isrc.iscas.ac.cn>
> ---

Acked-by: Nathan Chancellor <nathan at kernel.org>

>  scripts/Kconfig.include | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/scripts/Kconfig.include b/scripts/Kconfig.include
> index d42042b6c9e2..9954b8093fab 100644
> --- a/scripts/Kconfig.include
> +++ b/scripts/Kconfig.include
> @@ -78,3 +78,8 @@ rustc-llvm-version := $(shell,$(srctree)/scripts/rustc-llvm-version.sh $(RUSTC))
>  # If you are testing for unstable features, consider testing RUSTC_VERSION
>  # instead, as features may have different completeness while available.
>  rustc-option = $(success,trap "rm -rf .tmp_$$" EXIT; mkdir .tmp_$$; $(RUSTC) $(1) --crate-type=rlib /dev/null --out-dir=.tmp_$$ -o .tmp_$$/tmp.rlib)
> +
> +# $(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 = $(success,$(BINDGEN) /dev/null -- -x c --target=$(BINDGEN_TARGET) $(1))
> 
> -- 
> 2.51.1
>