netdev - Re: [PATCH bpf-next] libbpf: Fix include of bpf_helpers.h when libbpf is installed on system

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Date:   Tue, 14 Jan 2020 11:07:15 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Toke Høiland-Jørgensen <toke@...hat.com>
Cc:     Andrii Nakryiko <andriin@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>
Subject: Re: [PATCH bpf-next] libbpf: Fix include of bpf_helpers.h when libbpf
 is installed on system

On Tue, Jan 14, 2020 at 8:43 AM Toke Høiland-Jørgensen <toke@...hat.com> wrote:
>
> The change to use angled includes for bpf_helper_defs.h breaks compilation
> against libbpf when it is installed in the include path, since the file is
> installed in the bpf/ subdirectory of $INCLUDE_PATH. Fix this by adding the
> bpf/ prefix to the #include directive.
>
> Fixes: 6910d7d3867a ("selftests/bpf: Ensure bpf_helper_defs.h are taken from selftests dir")
> Signed-off-by: Toke Høiland-Jørgensen <toke@...hat.com>
> ---
> Not actually sure this fix works for all the cases you originally tried to

This does break selftests/bpf. Have you tried building selftests, does
it work for you? We need to fix selftests simultaneously with this
change.

> fix with the referred commit; please check. Also, could we please stop breaking
> libbpf builds? :)

Which libbpf build is failing right now? Both github and in-kernel
libbpf builds are fine. You must be referring to something else. What
exactly?

>
>  tools/lib/bpf/bpf_helpers.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/tools/lib/bpf/bpf_helpers.h b/tools/lib/bpf/bpf_helpers.h
> index 050bb7bf5be6..fa43d649e7a2 100644
> --- a/tools/lib/bpf/bpf_helpers.h
> +++ b/tools/lib/bpf/bpf_helpers.h
> @@ -2,7 +2,7 @@
>  #ifndef __BPF_HELPERS__
>  #define __BPF_HELPERS__
>
> -#include <bpf_helper_defs.h>
> +#include <bpf/bpf_helper_defs.h>
>
>  #define __uint(name, val) int (*name)[val]
>  #define __type(name, val) typeof(val) *name
> --
> 2.24.1
>