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[bpf-next,0/3] tools: bpftool: improve bpftool build experience

Message ID 20190829105645.12285-1-quentin.monnet@netronome.com
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Series tools: bpftool: improve bpftool build experience | expand

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Quentin Monnet Aug. 29, 2019, 10:56 a.m. UTC
Hi,
This set attempts to make it easier to build bpftool, in particular when
passing a specific output directory. This is a follow-up to the
conversation held last month by Lorenz, Ilya and Jakub [0].

The first patch is a minor fix to bpftool's Makefile, regarding the
retrieval of kernel version (which currently prints a non-relevant make
warning on some invocations).

Second patch improves the Makefile commands to support more "make"
invocations, or to fix building with custom output directory. On Jakub's
suggestion, a script is also added to BPF selftests in order to keep track
of the supported build variants.

At last, third patch is a sligthly modified version of Ilya's fix regarding
libbpf.a appearing twice on the linking command for bpftool.

[0] https://lore.kernel.org/bpf/CACAyw9-CWRHVH3TJ=Tke2x8YiLsH47sLCijdp=V+5M836R9aAA@mail.gmail.com/

Cc: Lorenz Bauer <lmb@cloudflare.com>
Cc: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Jakub Kicinski <jakub.kicinski@netronome.com>

Quentin Monnet (3):
  tools: bpftool: ignore make built-in rules for getting kernel version
  tools: bpftool: improve and check builds for different make
    invocations
  tools: bpftool: do not link twice against libbpf.a in Makefile

 tools/bpf/bpftool/Makefile                    |  18 ++-
 tools/testing/selftests/bpf/Makefile          |   3 +-
 .../selftests/bpf/test_bpftool_build.sh       | 137 ++++++++++++++++++
 3 files changed, 149 insertions(+), 9 deletions(-)
 create mode 100755 tools/testing/selftests/bpf/test_bpftool_build.sh

Comments

Jakub Kicinski Aug. 29, 2019, 5:25 p.m. UTC | #1
On Thu, 29 Aug 2019 11:56:42 +0100, Quentin Monnet wrote:
> Hi,
> This set attempts to make it easier to build bpftool, in particular when
> passing a specific output directory. This is a follow-up to the
> conversation held last month by Lorenz, Ilya and Jakub [0].
> 
> The first patch is a minor fix to bpftool's Makefile, regarding the
> retrieval of kernel version (which currently prints a non-relevant make
> warning on some invocations).
> 
> Second patch improves the Makefile commands to support more "make"
> invocations, or to fix building with custom output directory. On Jakub's
> suggestion, a script is also added to BPF selftests in order to keep track
> of the supported build variants.
> 
> At last, third patch is a sligthly modified version of Ilya's fix regarding
> libbpf.a appearing twice on the linking command for bpftool.
> 
> [0] https://lore.kernel.org/bpf/CACAyw9-CWRHVH3TJ=Tke2x8YiLsH47sLCijdp=V+5M836R9aAA@mail.gmail.com/

I think Ilya has a point, but otherwise looks good to me :)

Reviewed-by: Jakub Kicinski <jakub.kicinski@netronome.com>