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    Subject[PATCH 5.16 0243/1039] samples: bpf: Fix unknown warning group build warning on Clang
    From: Alexander Lobakin <>

    [ Upstream commit 6f670d06e47c774bc065aaa84a527a4838f34bd8 ]

    Clang doesn't have 'stringop-truncation' group like GCC does, and
    complains about it when building samples which use xdp_sample_user

    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 <>
    Signed-off-by: Andrii Nakryiko <>
    Acked-by: Kumar Kartikeya Dwivedi <>
    Signed-off-by: Sasha Levin <>
    samples/bpf/xdp_sample_user.h | 2 ++
    1 file changed, 2 insertions(+)

    diff --git a/samples/bpf/xdp_sample_user.h b/samples/bpf/xdp_sample_user.h
    index d97465ff8c62c..5f44b877ecf5f 100644
    --- a/samples/bpf/xdp_sample_user.h
    +++ b/samples/bpf/xdp_sample_user.h
    @@ -45,7 +45,9 @@ const char *get_driver_name(int ifindex);
    int get_mac_addr(int ifindex, void *mac_addr);

    #pragma GCC diagnostic push
    +#ifndef __clang__
    #pragma GCC diagnostic ignored "-Wstringop-truncation"
    static inline char *safe_strncpy(char *dst, const char *src, size_t size)

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