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

[Asuna Yang]

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