[yocto] which yocto doc explains bitbake assignment variations?

[Robert P. J. Day]

  somewhere, i'm assuming there's a decent explanation of the
different bitbake assignment variations (=, ?=, ??=), but i don't
immediately see it, and i think it's pretty important that that's
explained properly.  pointer?

rday

-- 

========================================================================
Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
========================================================================