Meaning of ?= and ??= in bitbake/yocto

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                          What does the different assignment types mean in bitbake recipe scripts, such as:

     BB_NUMBER_THREADS	?=	"${@oe.utils.cpu_count()}"
     PARALLEL_MAKE	?=	"-j	${@oe.utils.cpu_count()}"
     MACHINE	??=	"qemux86"

What of above is analogous to Ruby's bb_number_threads ||= 'something'?
                        

Asked by Frankie_Fomalhaut (391 rep)

Jul 10, 2015, 08:53 AM
Last activity: Feb 7, 2025, 10:52 AM

Meaning of ?= and ??= in bitbake/yocto

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