[Buildroot] [PATCH v2 0/2] packages/linux-tools: perf: allow building perf with libtraceevent

["Alexis Lothoré via buildroot" <buildroot@buildroot.org>]

Hello,
this series is the v2 aiming to allow building perf with libtraceevent
support, in order to be able for example to manipulate and record
uprobes with perf.

This new revision gets a new commit enforcing PKG_CONFIG_LIBDIR for the
perf makefile. I am not sure how I did not get the corresponding error
the first time (maybe it needed some full rebuild to trigger), but I now
see that I fail to build perf with multiple stable kernels if I do not
enforce this variable (if it is not defined, the perf makefile will set
it to a value that is wrong in a buildroot build, see [1]). I found a
similar thread and attempt (see [2]), this series proposes to implement
the second option mentioned in there.

Also, as mentioned in the previous revision, perf may fail to build on
some older kernels because the patch correctly setting pkg-config binary
name has not been backported. I have identified that only 6.6 needed it
(as perf builds start to fail from 6.3, and are fixed in 6.11). The
corresponding stable backport request as been sent (see [3])

@Luca: since all stable kernels should get the relevant fix and then
allow to build perf with libtraceevent support, I eventually chose _not_
to mention any issue in the Kconfig.

[1] https://elixir.bootlin.com/linux/v6.12.36/source/tools/perf/Makefile.perf#L211
[2] https://lore.kernel.org/buildroot/aBk4au4rQpZJMrTQ@vamoirid-laptop/
[3] https://lore.kernel.org/stable/2025070955-discover-tree-644c@gregkh/T/#m394f2c9392da7cfd3ca130af6a7ec8ff6ee4b6bf

To: buildroot@buildroot.org
Cc: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Cc: Luca Ceresoli <luca.ceresoli@bootlin.com>
Cc: Olivier Benjamin <olivier.benjamin@bootlin.com>

Signed-off-by: Alexis Lothoré <alexis.lothore@bootlin.com>
---
Changes in v2:
- enforce PKG_CONFIG_LIBDIR
- Link to v1: https://lore.kernel.org/r/20250625-perf_libtraceevent-v1-1-0bf7620bc6c9@bootlin.com

---
Alexis Lothoré (2):
      package/linux-tools: perf: build with libtraceevent support when it is selected
      packages/linux-tools: perf: enforce PKG_CONFIG_LIBDIR

 package/linux-tools/linux-tool-perf.mk.in | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)
---
base-commit: f28f34e200bbadf0aea32110c72f7199e65fb0b9
change-id: 20250625-perf_libtraceevent-17e46ee28f90

Best regards,
-- 
Alexis Lothoré, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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