linux-kernel - Re: Kernel 5.5.4 build fail for BPF-selftests with latest LLVM

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Date:   Wed, 19 Feb 2020 08:41:27 -0800
From:   Alexei Starovoitov <alexei.starovoitov@...il.com>
To:     Jesper Dangaard Brouer <brouer@...hat.com>
Cc:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Andrii Nakryiko <andriin@...com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        BPF-dev-list <bpf@...r.kernel.org>,
        Daniel Borkmann <borkmann@...earbox.net>,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Anders Roxell <anders.roxell@...aro.org>,
        Toke Høiland-Jørgensen <toke@...hat.com>
Subject: Re: Kernel 5.5.4 build fail for BPF-selftests with latest LLVM

On Wed, Feb 19, 2020 at 4:30 AM Jesper Dangaard Brouer
<brouer@...hat.com> wrote:
>
> I'm willing to help out, such that we can do either version or feature
> detection, to either skip compiling specific test programs or at least
> give users a proper warning of they are using a too "old" LLVM version.
...
> progs/test_core_reloc_bitfields_probed.c:47:13: error: use of unknown builtin '__builtin_preserve_field_info' [-Wimplicit-function-declaration]
>         out->ub1 = BPF_CORE_READ_BITFIELD_PROBED(in, ub1);

imo this is proper warning message already.