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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 29 Jan 2025 20:10:21.5084 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: c999c83e-87e8-4eca-6c07-08dd40a0f5ae X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.117.161];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN2PEPF000044A4.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DS0PR12MB9060 On 1/26/25 12:58 PM, Miguel Ojeda wrote: > On Sun, Jan 26, 2025 at 7:30 PM Linus Torvalds > wrote: >> >> That seems to be a reasonable assumption. I guess some crazy setup >> *could* install a bindgen that uses a different llvm version than >> rustc itself, but that sounds pretty damn broken. > > Tangential to the issue, but a note on this: we have a few warnings in > that `rust_is_available.sh` script for things that "do not look > great", such as bindgen's libclang != Clang when `CC` is Clang, and we > could have a warning for the case you mention, i.e. bindgen's libclang > != rustc's LLVM. > > However, currently some kernel developers use toolchains from upstream > Rust (e.g. from `rustup`) instead of their distributions, so that Yes, because the distros themselves actually recommended it (Arch Linux, anyway). I took a reasonably careful look at the Rust setup for the basics to build the kernel, for Arch Linux, a couple times, and for 2024 at least, the answer clearly seemed to be: Use the distro's rustup package Use rustup to get rustc Use the distro's bindgen packaged Maybe that is All Wrong for 2025+. But this stuff is changing as Rust and Rust-for-Linux start to settle down, and I'm a little concerned about warnings unless they warn about something that *really* matters. > could be annoying for them (since their bindgen may be picking > libclang from their distribution). Trust me, the Rust installation is already sufficiently annoying. But maybe I'm just being paranoid, and the new warnings will direct me to a better setup. I'll take a look at this if you CC me, though, and see how Arch behaves. > > But eventually when things stabilize more it could make sense, if most > developers stop using those, as a by-default warning. > > Cheers, > Miguel > thanks, -- John Hubbard