netdev - Re: [PATCH bpf] selftests/bpf: bring back c++ include/link test

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Message-ID: <CAEf4BzYzY2WsiDoGokeo9AjmYfnrAhEn0YhTeQV6Gt-53WhR4A@mail.gmail.com>
Date:   Mon, 2 Dec 2019 13:57:12 -0800
From:   Andrii Nakryiko <andrii.nakryiko@...il.com>
To:     Stanislav Fomichev <sdf@...ichev.me>
Cc:     Stanislav Fomichev <sdf@...gle.com>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        "David S. Miller" <davem@...emloft.net>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>
Subject: Re: [PATCH bpf] selftests/bpf: bring back c++ include/link test

On Mon, Dec 2, 2019 at 1:49 PM Stanislav Fomichev <sdf@...ichev.me> wrote:
>
> On 12/02, Andrii Nakryiko wrote:
> > On Mon, Dec 2, 2019 at 12:28 PM Stanislav Fomichev <sdf@...gle.com> wrote:
> > > +# Make sure we are able to include and link libbpf against c++.
> > > +$(OUTPUT)/test_cpp: test_cpp.cpp $(BPFOBJ)
> > > +       $(CXX) $(CFLAGS) $^ -lelf -o $@
> >
> > let's use $(LDLIBS) instead here
> Sure, I'll send a v2 with $(LDLIBS); it might be worth doing for
> consistency.
>
> Just curious: any particular reason you want to do it?
> (looking it tools/build/features, I don't see any possible -lelf
> cross-dependency)

The main reason is that I'd like to only have one (at least one per
Makefile) place where we specify expected library dependencies. In my
extern libbpf change I was adding explicit dependency on zlib, for
instance, and having to grep for -lxxx to see where I should add -lz
is error-prone and annoying. Nothing beyond that.