# Re: \[PATCH net-next v3 1/7\] overflow: add DEFINE\_FLEX() for on-stack allocs

- From: Philip Li \<hidden\>
- Date: 2023-08-18 12:08:21 
- List: netdev
- Page: https://ratatoskr.run/netdev/2023/08/11269954
- Thread: https://ratatoskr.run/rust-for-linux/2023/08/11269942/t.md

```text
On Fri, Aug 18, 2023 at 01:10:07PM +0200, Miguel Ojeda wrote:
> On Fri, Aug 18, 2023 at 12:38 PM Przemek Kitszel
> [ref] wrote:
> >
> > Rust folks, could you please tell me if this is something I should fix,
> > or I just uncovered some existing bug in "unstable" thing?
> >
> > Perhaps it is worth to mention, diff of v3 vs v2 is:
> > move dummy implementation of __has_builtin() macro to the top of
> > compiler_types.h, just before `#ifndef ASSEMBLY`
> 
> Nothing you need to worry about, it is an issue with old `bindgen` and
> LLVM >= 16, fixed in commit 08ab786556ff ("rust: bindgen: upgrade to
> 0.65.1") which is in `rust-next` at the moment. Sorry about that, and
> thanks for pinging us!
> 
> LKP / Yujie / Philip: since we got a few reports on this, would it be
> possible to avoid LLVM >= 16 for Rust-enabled builds for any branch
> that does not include the new `bindgen` or at least 08ab786556ff? Or,

Got it, we will update the bot to handle this to avoid further false
positive.

> if Greg is OK with that, I guess we could also backport the upgrade,
> but perhaps it is a bit too much for stable?
> 
> Cheers,
> Miguel
```