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get_bb_var() currently end up calling 'bitbake -e' and parsing the whole output. However if postconfig isn't set then we can speed this up by just calling bitbake-getvar. The complication with failing bitbake-getvar calls is because we need to be careful to return None instead of the empty string when the variable doesn't exist. (From OE-Core rev: fafe77879aa6225aa8b5187ff590bb4998cbf987) Signed-off-by: Ross Burton <ross.burton@arm.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>