Re: [libgpiod][PATCH] bindings: rust: fix clippy lint warnings

["Erik Schilling" <erik.schilling@linaro.org>]

On Wed Jun 14, 2023 at 10:29 AM CEST, Kent Gibson wrote:
> On Wed, Jun 14, 2023 at 10:14:08AM +0200, Erik Schilling wrote:
> > On Mon Jun 12, 2023 at 5:40 PM CEST, Kent Gibson wrote:
> > > clippy from Rust 1.70 reports a host of warnings due to casting and type
> > > conversions across the FFI interface to libgpiod.
> > > These casts and conversions are required to support old versions of Rust
> > > that do not support recent Rust FFI extensions.
> > 
> > Could you elaborate which extensions are relevant here? Would it be
> > realistic to just update the minimum Rust version instead of needing
> > to include these suppression directives?
> > 
>
> Types were added in core::ffi[1] in 1.64 for just this purpose.
> e.g. c_uint[2]
> Though c_size_t[3] still remains in Experimental.
>
> And I guess the clippy lints followed soon after.
>
> Wrt setting the MSRV, but I assumed not, hence the allows.

For me bindgen seems to generate usize of size_t, thats why I asked.
Does that depend on the Rust version somehow? Or more concretely:
When will things like `gpiod_line_config_get_num_configured_offsets`
not get translated to `usize` so that we need a cast?

On my end (with latest toolchain and nightly), I do not see any
clippy warnings with `cargo clippy`. How exactly did you produce those
warnings?