It would be useful for tracking and introspection if buildhistory could also track the contents of native recipes.
Thanks to Ross this is now implemented: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=d533ffb82c9585037a6bae6fd862d53222fecb0e http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=adaba4ee4f0997a2827c3d73ed34081c82eb3b4d
Yay me!