When building uninative-tarball, during do_populate_sysroot you get a strange warning: WARNING: Function doesn't exist I assume this is because bb.build.exec_func() gets called with an empty argument somewhere.
Qi has sent a fix for this on the mailing list.
Fix merged to master: http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=2f78aebed25e6394c18eeed2ec840d01d4787e96
verified on master 8a0d8eee432924433c3e70198aaeab3161476c5f no warning displayed