netdev - Re: [PATCH bpf v3] libbpf: handle symbol versioning properly for libbpf.a

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Date:   Mon, 30 Sep 2019 16:42:48 +0000
From:   Alexei Starovoitov <ast@...com>
To:     Yonghong Song <yhs@...com>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
CC:     Daniel Borkmann <daniel@...earbox.net>,
        Kernel Team <Kernel-team@...com>,
        Kevin Laatz <kevin.laatz@...el.com>,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH bpf v3] libbpf: handle symbol versioning properly for
 libbpf.a

On 9/30/19 9:29 AM, Yonghong Song wrote:
> +OLD_VERSION(xsk_umem__create_v0_0_2, xsk_umem__create, LIBBPF_0.0.2)
> +NEW_VERSION(xsk_umem__create_v0_0_4, xsk_umem__create, LIBBPF_0.0.4)

how this will look when yet another version of this function is 
introduced, say in 0.0.6 ?

OLD_VERSION(xsk_umem__create_v0_0_2, xsk_umem__create, LIBBPF_0.0.2)
OLD_VERSION(xsk_umem__create_v0_0_4, xsk_umem__create, LIBBPF_0.0.4)
NEW_VERSION(xsk_umem__create_v0_0_6, xsk_umem__create, LIBBPF_0.0.6)

0.0.4 will be renamed to OLD_ and the latest addition NEW_ ?
The macro name feels a bit confusing. May be instead of NEW_
call it CURRENT_ ? or DEFAULT_ ?
NEW_ will become not so 'new' few months from now.