tree/branch: poky/1.2_M4 commit: da6233ea034f35eff59306fdad31f318c340c359 With 1.2 M4, setting BB_NUMBER_THREADS and PARALLEL_MAKE in Hob could not work, it will use the default value of these parameters in local.conf.
http://git.yoctoproject.org/cgit/cgit.cgi/poky/commit/?id=9c1dcdceb235c53b92a64e741f5a5491b1e489bd
verify it with latest branch poky/master, commitID 2ddf7d3e8326e8cb07101ddb2d6e5dc6866371e2.