Hello, I'm using GCC 8.4.0, binutils 2.34 and pahole 1.17, compiling on an Ubuntu/x86_64 host and targeting both little- and big-endian mips running on malta/qemu. When cross-compiling Linux 5.4.x LTS and testing bpftool/BTF functionality on the target, I encounter errors on big-endian targets: > root@OpenWrt:/# bpftool btf dump file /sys/kernel/btf/vmlinux > libbpf: failed to get EHDR from /sys/kernel/btf/vmlinux > Error: failed to load BTF from /sys/kernel/btf/vmlinux: No error information After investigating, the problem appears to be that "pahole -J" running on the x86_64 little-endian host will always generate raw BTF of native endianness (based on BTF magic), which causes the error above on big-endian targets. Is this expected? Is DEBUG_INFO_BTF supported in general when cross-compiling? How does one generate BTF encoded for the target endianness with pahole? Thanks for any feedback or suggestions, Tony
