On 16/06/2022 10:11, Shahab Vahedi wrote:
On 6/16/22 01:27, James Hilliard wrote:
On Wed, Jun 15, 2022 at 5:10 AM Shahab Vahedi via buildroot
<buildr...@buildroot.org> wrote:
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
You're right about the clang version, but it doesn't have anything to do
with Buildroot's clang. The build process uses the clang that is installed
on the host. For Debian bullseye, that is clang 11.
>
To emphasise, I am cross-building bpftool for my "arc-linux" target, and yet
the bootstrap part of bpftool, uses the x86 clang of the Debian machine.
Hm, that smells like we actually want to build host-clang (after updating it
to 11.1.0 of course) so that we are sure a known version of clang is used.
Possibly with a check-host-clang check to avoid building it if the installed
clang is good enough.
And we probably want a user-visible option to enable co-re then, because it's
going to be expensive to build.
Regards,
Arnout
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