https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107846
--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> --- (In reply to James Hilliard from comment #7) > This appears to fix error, the warning is still present: > progs/test_tc_tunnel.c: In function '__encap_ipv4': > progs/test_tc_tunnel.c:228:31: warning: taking address of packed member of > 'struct v4hdr' may result in an unaligned pointer value > [-Waddress-of-packed-member] > 228 | set_ipv4_csum((void *)&h_outer.ip); > | ^~~~~~~~~~~ That warning is correct and is a bug in the test program ...