From: Andrii Nakryiko <andrii.nakryiko@gmail.com>
To: Quentin Monnet <quentin@isovalent.com>
Cc: Alexei Starovoitov <ast@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Andrii Nakryiko <andrii@kernel.org>,
Networking <netdev@vger.kernel.org>, bpf <bpf@vger.kernel.org>
Subject: Re: [PATCH bpf-next v2 6/9] bpf: iterators: install libbpf headers when building
Date: Mon, 4 Oct 2021 12:10:57 -0700 [thread overview]
Message-ID: <CAEf4Bzb=jP3kU6O6QhZR6pcYn-7bkP8fr5ZDirWzf46WKEWA8Q@mail.gmail.com> (raw)
In-Reply-To: <CACdoK4K4-x4+ZWXyB697Kn8RK5AyoCST+V7Lhtk_Kaqm5uQ6wg@mail.gmail.com>
On Sat, Oct 2, 2021 at 3:12 PM Quentin Monnet <quentin@isovalent.com> wrote:
>
> On Sat, 2 Oct 2021 at 21:27, Quentin Monnet <quentin@isovalent.com> wrote:
> >
> > On Sat, 2 Oct 2021 at 00:20, Andrii Nakryiko <andrii.nakryiko@gmail.com> wrote:
> > >
> > > On Fri, Oct 1, 2021 at 4:09 AM Quentin Monnet <quentin@isovalent.com> wrote:
> > > >
> > > > API headers from libbpf should not be accessed directly from the
> > > > library's source directory. Instead, they should be exported with "make
> > > > install_headers". Let's make sure that bpf/preload/iterators/Makefile
> > > > installs the headers properly when building.
> >
> > > >
> > > > -$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) | $(OUTPUT)
> > > > +$(BPFOBJ): $(wildcard $(LIBBPF_SRC)/*.[ch] $(LIBBPF_SRC)/Makefile) \
> > > > + | $(LIBBPF_OUTPUT) $(LIBBPF_INCLUDE)
> > >
> > > Would it make sense for libbpf's Makefile to create include and output
> > > directories on its own? We wouldn't need to have these order-only
> > > dependencies everywhere, right?
> >
> > Good point, I'll have a look at it.
> > Quentin
>
> So libbpf already creates the include (and parent $(DESTDIR))
> directory, so I can get rid of the related dependencies. But I don't
> see an easy solution for the output directory for the object files.
> The issue is that libbpf's Makefile includes
> tools/scripts/Makefile.include, which checks $(OUTPUT) and errors out
Did you check what benefits the use of tools/scripts/Makefile.include
brings? Last time I had to deal with some non-trivial Makefile
problem, this extra dance with tools/scripts/Makefile.include and some
related complexities didn't seem very justified. So unless there are
some very big benefits to having tool's Makefile.include included, I'd
rather simplify libbpf's in-kernel Makefile and make it more
straightforward. We have a completely independent separate Makefile
for libbpf in Github, and I think it's more straightforward. Doesn't
have to be done in this change, of course, but I was curious to hear
your thoughts given you seem to have spent tons of time on this
already.
> if the directory does not exist. This prevents us from creating the
> directory as part of the regular targets. We could create it
> unconditionally before running any target, but it's ugly; and I don't
> see any simple workaround.
>
> So I'll remove the deps on $(LIBBPF_INCLUDE) and keep the ones on
> $(LIBBPF_OUTPUT).
next prev parent reply other threads:[~2021-10-04 19:11 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-01 11:08 [PATCH bpf-next v2 0/9] install libbpf headers when using the library Quentin Monnet
2021-10-01 11:08 ` [PATCH bpf-next v2 1/9] tools: bpftool: remove unused includes to <bpf/bpf_gen_internal.h> Quentin Monnet
2021-10-01 11:08 ` [PATCH bpf-next v2 2/9] tools: bpftool: install libbpf headers instead of including the dir Quentin Monnet
2021-10-01 22:55 ` Andrii Nakryiko
2021-10-01 11:08 ` [PATCH bpf-next v2 3/9] tools: resolve_btfids: install libbpf headers when building Quentin Monnet
2021-10-01 23:01 ` Andrii Nakryiko
2021-10-01 11:08 ` [PATCH bpf-next v2 4/9] tools: runqslower: " Quentin Monnet
2021-10-01 11:08 ` [PATCH bpf-next v2 5/9] bpf: preload: " Quentin Monnet
2021-10-01 11:08 ` [PATCH bpf-next v2 6/9] bpf: iterators: " Quentin Monnet
2021-10-01 23:19 ` Andrii Nakryiko
2021-10-02 20:27 ` Quentin Monnet
2021-10-02 22:11 ` Quentin Monnet
2021-10-04 19:10 ` Andrii Nakryiko [this message]
2021-10-04 21:30 ` Quentin Monnet
2021-10-05 20:03 ` Quentin Monnet
2021-10-06 17:44 ` Andrii Nakryiko
2021-10-01 11:08 ` [PATCH bpf-next v2 7/9] samples/bpf: " Quentin Monnet
2021-10-01 23:22 ` Andrii Nakryiko
2021-10-02 20:30 ` Quentin Monnet
2021-10-01 11:08 ` [PATCH bpf-next v2 8/9] samples/bpf: update .gitignore Quentin Monnet
2021-10-01 11:08 ` [PATCH bpf-next v2 9/9] selftests/bpf: better clean up for runqslower in test_bpftool_build.sh Quentin Monnet
2021-10-01 23:05 ` [PATCH bpf-next v2 0/9] install libbpf headers when using the library Andrii Nakryiko
2021-10-01 23:27 ` Andrii Nakryiko
2021-10-02 20:40 ` Quentin Monnet
2021-10-03 19:20 ` Quentin Monnet
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