From: "Toke Høiland-Jørgensen" <toke@redhat.com>
To: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Yonghong Song <yhs@fb.com>, bpf <bpf@vger.kernel.org>
Subject: Re: Latest libbpf fails to load programs compiled with old LLVM
Date: Mon, 07 Dec 2020 17:51:34 +0100 [thread overview]
Message-ID: <874kkx5zl5.fsf@toke.dk> (raw)
In-Reply-To: <CAADnVQKYaeF2KCC5SLBg3feUY_DBh-eq2_O=T10_+13z3wNm1Q@mail.gmail.com>
Alexei Starovoitov <alexei.starovoitov@gmail.com> writes:
> On Mon, Dec 7, 2020 at 8:15 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>>
>> Alexei Starovoitov <alexei.starovoitov@gmail.com> writes:
>>
>> > On Mon, Dec 7, 2020 at 3:03 AM Toke Høiland-Jørgensen <toke@redhat.com> wrote:
>> >>
>> >> Wait, what? This is a regression that *breaks people's programs* on
>> >> compiler versions that are still very much in the wild! I mean, fine if
>> >> you don't want to support new features on such files, but then surely we
>> >> can at least revert back to the old behaviour?
>> >
>> > Those folks that care about compiling with old llvm would have to stick
>> > to whatever loader they have instead of using libbpf.
>> > It's not a backward compatibility breakage.
>>
>> What? It's a change in libbpf that breaks loading of existing BPF object
>> files that were working (with libbpf) before. If that's not a backward
>> compatibility break then that term has lost all meaning.
>
> The user space library is not a kernel.
> The library will change its interface. It will remove functions, features, etc.
> That's what .map is for.
Right, OK, so how do I use .map to get the old behaviour here? That's
all I'm asking for, really...
-Toke
next prev parent reply other threads:[~2020-12-07 16:53 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 17:55 Latest libbpf fails to load programs compiled with old LLVM Toke Høiland-Jørgensen
2020-12-04 1:42 ` Yonghong Song
2020-12-04 9:34 ` Toke Høiland-Jørgensen
2020-12-04 17:54 ` Yonghong Song
2020-12-04 19:23 ` Andrii Nakryiko
2020-12-07 10:59 ` Toke Høiland-Jørgensen
2020-12-07 15:55 ` Alexei Starovoitov
2020-12-07 16:15 ` Toke Høiland-Jørgensen
2020-12-07 16:20 ` Alexei Starovoitov
2020-12-07 16:51 ` Toke Høiland-Jørgensen [this message]
2020-12-07 17:16 ` Alexei Starovoitov
2020-12-07 22:18 ` Toke Høiland-Jørgensen
2020-12-08 1:20 ` Alexei Starovoitov
2020-12-07 18:02 ` David Ahern
2020-12-07 18:14 ` Alexei Starovoitov
2020-12-07 18:59 ` David Ahern
2020-12-08 2:47 ` Andrii Nakryiko
2020-12-08 13:41 ` Toke Høiland-Jørgensen
2020-12-08 18:39 ` Andrii Nakryiko
2020-12-08 22:38 ` Toke Høiland-Jørgensen
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