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

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Date:   Mon, 2 Dec 2019 14:15:31 -0800
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>
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 12/02, Andrii Nakryiko wrote:
> 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.
Makes sense, agreed.