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The BB_ENV_WHITELIST doesn't work well and flushes BB_ENV_EXTRAWHITE, here is an example: $ export BB_ENV_WHITELIST $ export BB_NUMBER_THREADS=10 (or other value) Edit conf/local.conf, change "BB_NUMBER_THREADS =" to "BB_NUMBER_THREADS ?=" $ bitbake -e | grep '^BB_NUMBER_THREADS =' we will notice that BB_NUMBER_THREADS' value doesn't change, though BB_NUMBER_THREADS in both BB_ENV_WHITELIST and BB_ENV_EXTRAWHITE. This is because the "approved" inside the function approved_variables doesn't include BB_ENV_WHITELIST or BB_ENV_EXTRAWHITE when BB_ENV_WHITELIST is set (they are incuded by preserved_envvars()), so the BB_ENV_WHITELIST and BB_ENV_EXTRAWHITE will be removed from the env in the first call from bin/bitbake, and when it is called again by cooker.py, their value will be None, then the vars inside them will be removed from the env. Add BB_ENV_WHITELIST and BB_ENV_EXTRAWHITE to the "approved" would fix the problem. [YOCTO #4031] (Bitbake rev: d2b07e6516dd308d0045a7fdb72b588af9d676ad) Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>