[Buildroot] [RFC PATCH v1 0/1] libbpf: Remove bpf.h in linux.mk

[Francis Laniel <flaniel@linux.microsoft.com>]

Hi everyone.


I hope you are fine and the same for your relatives.

The goal of this contribution is to fix this a recurrent building problem which
happens in buildroot CI (sorry for only taking care of this now...) [1].
Actually, to build host-pahole, we install host-libbpf uapi headers to the host
but we remove bpf.h to avoid a conflict with this file while building the
kernel [2].
Then host-pahole will use the system uapi headers to be built.
The problem with this approach is that it works while the system uapi headers
permits building host-pahole which is not the case within buildroot CI.

So, a solution to this problem would be to keep bpf.h when installing uapi
headers and to remove it right before building the kernel to avoid the conflict.
As a consequence, we are able to build host-pahole with a good bpf.h and we can
then build the kernel.

I sadly know this approach is far from being perfect but this is the only way I
see to fix this build problem... So, if someone has a better idea I am up to
implement it!

Francis Laniel (1):
  package/libbpf: remove bpf.h in linux.mk

 linux/linux.mk           | 23 +++++++++++++++++++++++
 package/libbpf/libbpf.mk | 21 ++++-----------------
 2 files changed, 27 insertions(+), 17 deletions(-)


Best regards and thank you in advance.
---
[1] http://autobuild.buildroot.net/results/7b3f560a773791e00b8bb32f64c0d39749b809b1/build-end.log
[2] https://github.com/buildroot/buildroot/blob/f3f441aea23dbf84fec85a9cef1aaf276c4484f0/package/libbpf/libbpf.mk#L61
-- 
2.25.1

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