netdev - Re: [PATCH v5 bpf-next 11/15] libbpf: don't use cxx to test

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Date:   Fri, 22 Nov 2019 16:01:27 -0800
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Andrii Nakryiko <andrii.nakryiko@...il.com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Yonghong Song <yhs@...com>,
        "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jesper Dangaard Brouer <hawk@...nel.org>,
        john fastabend <john.fastabend@...il.com>,
        open list <linux-kernel@...r.kernel.org>,
        Networking <netdev@...r.kernel.org>, bpf <bpf@...r.kernel.org>,
        clang-built-linux@...glegroups.com, ilias.apalodimas@...aro.org,
        sergei.shtylyov@...entembedded.com,
        Andrii Nakryiko <andriin@...com>
Subject: Re: [PATCH v5 bpf-next 11/15] libbpf: don't use cxx to test_libpf
 target

On 11/23, Ivan Khoronzhuk wrote:
> On Fri, Nov 22, 2019 at 08:32:11AM -0800, Stanislav Fomichev wrote:
> > On 11/21, Andrii Nakryiko wrote:
> > > On Thu, Nov 21, 2019 at 1:42 PM Stanislav Fomichev <sdf@...ichev.me> wrote:
> > > >
> > > > On 10/11, Ivan Khoronzhuk wrote:
> > > > > No need to use C++ for test_libbpf target when libbpf is on C and it
> > > > > can be tested with C, after this change the CXXFLAGS in makefiles can
> > > > > be avoided, at least in bpf samples, when sysroot is used, passing
> > > > > same C/LDFLAGS as for lib.
> > > > > Add "return 0" in test_libbpf to avoid warn, but also remove spaces at
> > > > > start of the lines to keep same style and avoid warns while apply.
> > > > Hey, just spotted this patch, not sure how it slipped through.
> > > > The c++ test was there to make sure libbpf can be included and
> > > > linked against c++ code (i.e. libbpf headers don't have some c++
> > > > keywords/etc).
> > > >
> > > > Any particular reason you were not happy with it? Can we revert it
> > > > back to c++ and fix your use-case instead? Alternatively, we can just
> > > > remove this test if we don't really care about c++.
> > > >
> > > 
> > > No one seemed to know why we have C++ pieces in pure C library and its
> > > Makefile, so we decide to "fix" this. :)
> > It's surprising, the commit 8c4905b995c6 clearly states the reason
> > for adding it. Looks like it deserved a real comment in the Makefile :-)
> 
> I dislike changing things like this, but I was asked while review and
> it seemed logical enough. The comment could prevent us from doing this.
No worries, I'll add it back with a comment :-)

> > > But I do understand your concern. Would it be possible to instead do
> > > this as a proper selftests test? Do you mind taking a look at that?
> > Ack, will move this test_libbpf.c into selftests and convert back to
> > c++.
> 
> -- 
> Regards,
> Ivan Khoronzhuk