From: Daniel Borkmann <daniel@iogearbox.net>
To: Andrii Nakryiko <andrii.nakryiko@gmail.com>,
Tobias Klauser <tklauser@distanz.ch>
Cc: Alexei Starovoitov <ast@kernel.org>,
Song Liu <songliubraving@fb.com>, Yonghong Song <yhs@fb.com>,
bpf <bpf@vger.kernel.org>,
Alexei Starovoitov <alexei.starovoitov@gmail.com>,
Quentin Monnet <quentin@isovalent.com>
Subject: Re: [PATCH bpf-next v2] bpftool: use linux/types.h from source tree for profiler build
Date: Thu, 12 Mar 2020 19:38:59 +0100 [thread overview]
Message-ID: <40a2c6fc-6bea-21d2-b285-04b319eccea6@iogearbox.net> (raw)
In-Reply-To: <CAEf4BzakzbN4+PVa4TFsOhH=Pnt_4mhPknH74kwsRkOApkKhOg@mail.gmail.com>
On 3/12/20 6:59 PM, Andrii Nakryiko wrote:
> On Thu, Mar 12, 2020 at 6:04 AM Tobias Klauser <tklauser@distanz.ch> wrote:
>>
>> When compiling bpftool on a system where the /usr/include/asm symlink
>> doesn't exist (e.g. on an Ubuntu system without gcc-multilib installed),
>> the build fails with:
>>
>> CLANG skeleton/profiler.bpf.o
>> In file included from skeleton/profiler.bpf.c:4:
>> In file included from /usr/include/linux/bpf.h:11:
>> /usr/include/linux/types.h:5:10: fatal error: 'asm/types.h' file not found
>> #include <asm/types.h>
>> ^~~~~~~~~~~~~
>> 1 error generated.
>> make: *** [Makefile:123: skeleton/profiler.bpf.o] Error 1
>>
>> This indicates that the build is using linux/types.h from system headers
>> instead of source tree headers.
>>
>> To fix this, adjust the clang search path to include the necessary
>> headers from tools/testing/selftests/bpf/include/uapi and
>> tools/include/uapi. Also use __bitwise__ instead of __bitwise in
>> skeleton/profiler.h to avoid clashing with the definition in
>> tools/testing/selftests/bpf/include/uapi/linux/types.h.
>>
>> Cc: Daniel Borkmann <daniel@iogearbox.net>
>> Cc: Song Liu <songliubraving@fb.com>
>> Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
>> Cc: Quentin Monnet <quentin@isovalent.com>
>> Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
>> ---
>> tools/bpf/bpftool/Makefile | 5 ++++-
>> tools/bpf/bpftool/skeleton/profiler.h | 17 ++++++++---------
>> 2 files changed, 12 insertions(+), 10 deletions(-)
>>
>> diff --git a/tools/bpf/bpftool/Makefile b/tools/bpf/bpftool/Makefile
>> index 20a90d8450f8..f294f6c1e795 100644
>> --- a/tools/bpf/bpftool/Makefile
>> +++ b/tools/bpf/bpftool/Makefile
>> @@ -120,7 +120,10 @@ $(OUTPUT)_bpftool: $(_OBJS) $(LIBBPF)
>> $(QUIET_LINK)$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $(_OBJS) $(LIBS)
>>
>> skeleton/profiler.bpf.o: skeleton/profiler.bpf.c
>> - $(QUIET_CLANG)$(CLANG) -I$(srctree)/tools/lib -g -O2 -target bpf -c $< -o $@
>> + $(QUIET_CLANG)$(CLANG) \
>> + -I$(srctree)/tools/include/uapi/ \
>> + -I$(srctree)/tools/testing/selftests/bpf/include/uapi \
>
> Seems like I'm spoiling all the fun today :) But why are we ok with
> bpftool build depending on selftests? This just makes it even harder
> to have a stand-alone bpftool build eventually (similar to libbpf's
> Github).
I suspect the Github copy of bpftool would have its own include infra like
in case of libbpf [0]?
Agree in any case that it's not an optimal situation with this dependency;
I suspect we might need the tools/testing/selftests/bpf/include/uapi/ under
tools/include/uapi/ in a proper way.
[0] https://github.com/libbpf/libbpf/tree/master/include
prev parent reply other threads:[~2020-03-12 18:39 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-03-12 10:53 [PATCH] bpftool: use linux/types.h from source tree for profiler build Tobias Klauser
2020-03-12 12:48 ` Quentin Monnet
2020-03-12 12:54 ` Tobias Klauser
2020-03-12 13:03 ` [PATCH bpf-next v2] " Tobias Klauser
2020-03-12 14:15 ` Quentin Monnet
2020-03-12 15:38 ` Daniel Borkmann
2020-03-12 17:59 ` Andrii Nakryiko
2020-03-12 18:38 ` Daniel Borkmann [this message]
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