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The copr repo from che was using LTO and he reported radv broke recently with it. When testing with lto builds here I noticed that we weren't seeing any instance extensions reported. It appears LTO was treating the const without extern as an empty struct, this is possibly a gcc bug, but we can work around it just by marking these with extern. Acked-by: Samuel Pitoiset <samuel.pitoiset@gmail.com> Signed-off-by: Dave Airlie <airlied@redhat.com>