On Fri, Apr 26, 2024 at 12:31:17PM +0200, Björn Töpel wrote:
> Jiri Olsa <olsajiri@xxxxxxxxx> writes:
>
> > On Thu, Nov 02, 2023 at 11:32:52AM +0100, Björn Töpel wrote:
> >> From: Björn Töpel <bjorn@xxxxxxxxxxxx>
> >>
> >> When a tool cross-build has LLVM=1 set, the clang cross-compilation
> >> flags are not passed to the feature detection build system. This
> >> results in the host's features are detected instead of the targets.
> >>
> >> E.g, triggering a cross-build of bpftool:
> >>
> >> cd tools/bpf/bpftool
> >> make ARCH=riscv CROSS_COMPILE=riscv64-linux-gnu- LLVM=1
> >>
> >> would report the host's, and not the target's features.
> >>
> >> Correct the issue by passing the CLANG_CROSS_FLAGS variable to the
> >> feature detection makefile.
> >>
> >> Fixes: cebdb7374577 ("tools: Help cross-building with clang")
> >> Signed-off-by: Björn Töpel <bjorn@xxxxxxxxxxxx>
> >
> > Acked-by: Jiri Olsa <jolsa@xxxxxxxxxx>
>
> Waking up the dead!
>
> Arnaldo, Jean-Philippe: I'm still stung by what this patch fixes. LMK
> what you need from me/this patch to pick it up.
I guess the problem is these files don't have a specific tree. Since you
mention BPF maybe it should go through the BPF tree, in which case you
could resend to the tools/bpf maintainers (and "PATCH bpf" subject prefix)
FWIW the change looks good to me:
Reviewed-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
