Re: [Buildroot] [PATCH v3 1/1] package/bpftool: revert bpf_cookie patch to allow building

[James Hilliard <james.hilliard1@gmail.com>]

On Wed, Jun 15, 2022 at 5:10 AM Shahab Vahedi via buildroot
<buildroot@buildroot.org> wrote:
>
> Hi Arnout,
>
> On 6/14/22 19:14, Arnout Vandecappelle wrote:
> >
> > On 14/06/2022 11:31, Shahab Vahedi wrote:
> >> Building bpftool on Debian 11 (bullseye) with kernel v5.10 and clang-11
> >
> >  How do you build host-bpftool with clang in Buildroot context? HOSTCC is set to gcc in the Makefile... Do you supply an explicit HOSTCC= on the Buildroot command line? I'm not sure if we are really interested in carrying fixes for such exotic and not-really-supported situations...
>
> No, I don't do any sort of trickery to build bpftool on my end. The
> bootstrapping, if becomes available for your configuration, uses clang
> and only clang. I tried to explain this in v4 of the patch [1], the
> second paragraph of the commit message.

I think clang/llvm support isn't going to work correctly yet since we only have
version 9.0.1, there's a series bumping to version 11.1.0 that should fix that:
https://patchwork.ozlabs.org/project/buildroot/list/?series=291585

Minimum clang/llvm version for libbpf co-re is version 10:
https://github.com/libbpf/libbpf#bpf-co-re-compile-once--run-everywhere

>
> [1] [v4,1/1] package/bpftool: revert bpf_cookie patch to allow building
> https://patchwork.ozlabs.org/project/buildroot/patch/29d2a8c7-44cd-da42-5fed-f17ec0f8ccf2@synopsys.com/
>
> --
> Shahab
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