Created attachment 872109 [details] build.log Build failure is in BPF tools, and appears to be caused by -Werror.
Created attachment 872110 [details] emerge --info
Created attachment 872111 [details] emerge -pqv
Exchanging -Og for -O3 in my CFLAGS makes this go away.
https://gitweb.gentoo.org/proj/linux-patches.git/commit/?h=6.10&id=b5d74b80983311dd62baedc8e4e94656ed58b8eb https://gitweb.gentoo.org/proj/linux-patches.git/commit/?h=6.10&id=59cf1147d40237fbf00353e17a5cf22141622e1b This is fixed upstream too.