netdev - Re: [PATCH bpf-next v2] libbpf: make sure bpf headers are c++ include-able

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Date:   Tue, 20 Nov 2018 16:05:55 -0800
From:   Stanislav Fomichev <sdf@...ichev.me>
To:     Alexei Starovoitov <alexei.starovoitov@...il.com>
Cc:     Stanislav Fomichev <sdf@...gle.com>, netdev@...r.kernel.org,
        ast@...nel.org, daniel@...earbox.net, ys114321@...il.com
Subject: Re: [PATCH bpf-next v2] libbpf: make sure bpf headers are c++
 include-able

On 11/20, Alexei Starovoitov wrote:
> On Tue, Nov 20, 2018 at 01:37:23PM -0800, Stanislav Fomichev wrote:
> > Wrap headers in extern "C", to turn off C++ mangling.
> > This simplifies including libbpf in c++ and linking against it.
> > 
> > v2 changes:
> > * do the same for btf.h
> > 
> > Signed-off-by: Stanislav Fomichev <sdf@...gle.com>
> > ---
> >  tools/lib/bpf/bpf.h    | 9 +++++++++
> >  tools/lib/bpf/btf.h    | 8 ++++++++
> >  tools/lib/bpf/libbpf.h | 9 +++++++++
> >  3 files changed, 26 insertions(+)
> > 
> > diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h
> > index 26a51538213c..9ea3aec82d8a 100644
> > --- a/tools/lib/bpf/bpf.h
> > +++ b/tools/lib/bpf/bpf.h
> > @@ -27,6 +27,10 @@
> >  #include <stdbool.h>
> >  #include <stddef.h>
> >  
> > +#ifdef __cplusplus
> > +extern "C" {
> > +#endif
> 
> Acked-by: Alexei Starovoitov <ast@...nel.org>
> 
> was wondering whether it's possible to make it testable.
> HOSTCXX is available, but I don't see much of the kernel tree
> using it...
By testable you mean compile some dummy c++ main and link against libbpf?

perf has something similar:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/tools/perf/util/c++/clang-test.cpp#n7

But they don't use Makefiles for that (there is USE_CXX feature test as
well), so I'm not sure either :-/