In CI we get spurious failures about unitialized variables with gcc
versions older then (depending on the case) 12, 13, or 14. Let's only
try to do this check with newer gcc which returns more useful results.
At the same time, do compile with both gcc and clang at -O2, just
disable the warning.
The old logic seems to have been confused. We compile with -Wall, at
least in some cases, which includes -Wmaybe-unitialized. So if we
_don't_ want it, we need to explicitly disable it.
Use the same trickery we do in the package build and search for
the actual bpftool binary. For the CI job any one we find is
good enough.
When we switch all jobs to 26.04 we can drop all of this.
This reverts commit cc814110af.
/usr/sbin/bpftool is completely broken inside containers on
Ubuntu which makes meson blow up so disable the bpf-framework
stuff to avoid the issue.
TODO: Drop when we move off Ubuntu Noble as this will be fixed
in the next Ubuntu LTS release.
Zbigniew Jędrzejewski-Szmek
Daan De Meyer
Yu Watanabe
Luca Boccassi