linux-kernel - Re: [PATCH bpf 2/2] samples: bpf: fix 'unknown warning group' build warning on Clang

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Message-ID: <20211204004744.eqakjotrfu4ceksp@apollo.legion>
Date:   Sat, 4 Dec 2021 06:17:44 +0530
From:   Kumar Kartikeya Dwivedi <memxor@...il.com>
To:     Alexander Lobakin <alexandr.lobakin@...el.com>
Cc:     Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Andrii Nakryiko <andrii@...nel.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>,
        John Fastabend <john.fastabend@...il.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        netdev@...r.kernel.org, bpf@...r.kernel.org,
        linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH bpf 2/2] samples: bpf: fix 'unknown warning group' build
 warning on Clang

On Sat, Dec 04, 2021 at 01:20:04AM IST, Alexander Lobakin wrote:
> Clang doesn't have 'stringop-truncation' group like GCC does, and
> complains about it when building samples which use xdp_sample_user
> infra:
>
>  samples/bpf/xdp_sample_user.h:48:32: warning: unknown warning group '-Wstringop-truncation', ignored [-Wunknown-warning-option]
>  #pragma GCC diagnostic ignored "-Wstringop-truncation"
>                                 ^
> [ repeat ]
>
> Those are harmless, but avoidable when guarding it with ifdef.
> I could guard push/pop as well, but this would require one more
> ifdef cruft around a single line which I don't think is reasonable.
>
> Fixes: 156f886cf697 ("samples: bpf: Add basic infrastructure for XDP samples")
> Signed-off-by: Alexander Lobakin <alexandr.lobakin@...el.com>
> ---

Acked-by: Kumar Kartikeya Dwivedi <memxor@...il.com>

> [...]

--
Kartikeya