From: Seth Forshee <seth.forshee@canonical.com>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
"open list:KERNEL SELFTEST FRAMEWORK"
<linux-kselftest@vger.kernel.org>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>,
open list <linux-kernel@vger.kernel.org>
Subject: Re: BPF selftests build failure in 5.10-rc
Date: Thu, 10 Dec 2020 07:36:33 -0600 [thread overview]
Message-ID: <X9IkYa6D9QrjooOd@ubuntu-x1> (raw)
In-Reply-To: <CAEf4BzYAptUF+AxmkVk7BjJWRE6UaLkPowKM+pWbFuOV9Z4GGg@mail.gmail.com>
On Wed, Dec 09, 2020 at 04:15:35PM -0800, Andrii Nakryiko wrote:
> On Wed, Dec 9, 2020 at 2:24 PM Seth Forshee <seth.forshee@canonical.com> wrote:
> >
> > Building the BPF selftests with clang 11, I'm getting the following
> > error:
> >
> > CLNG-LLC [test_maps] profiler1.o
> > In file included from progs/profiler1.c:6:
> > progs/profiler.inc.h:260:17: error: use of unknown builtin '__builtin_preserve_enum_value' [-Wimplicit-function-declaration]
> > int cgrp_id = bpf_core_enum_value(enum cgroup_subsys_id___local,
> > ^
> > /home/ubuntu/unstable/tools/testing/selftests/bpf/tools/include/bpf/bpf_core_read.h:179:2: note: expanded from macro 'bpf_core_enum_value'
> > __builtin_preserve_enum_value(*(typeof(enum_type) *)enum_value, BPF_ENUMVAL_VALUE)
> > ^
> > 1 error generated.
> > llc: error: llc: <stdin>:1:1: error: expected top-level entity
> > BPF obj compilation failed
>
> Addressed by fb3558127cb6 ("bpf: Fix selftest compilation on clang 11")
Great, thanks!
>
> >
> > I see that test_core_reloc_enumval.c takes precautions around the use of
> > __builtin_preserve_enum_value as it is currently only available in clang
> > 12 nightlies. Is it possible to do something similar here? Though I see
> > that the use of the builtin is not nearly so neatly localized as it is
> > in test_core_reloc_enumval.c.
> >
> > Thanks,
> > Seth
prev parent reply other threads:[~2020-12-10 13:38 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-09 22:23 BPF selftests build failure in 5.10-rc Seth Forshee
2020-12-10 0:15 ` Andrii Nakryiko
2020-12-10 13:36 ` Seth Forshee [this message]
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