[OE-core] question about meta/class/qmake-base.bbclass

Kang Kai Kai.Kang at windriver.com
Wed Aug 24 01:48:15 UTC 2011

On 2011年08月23日 02:46, Paul Eggleton wrote:
> On Monday 22 August 2011 10:42:42 Kang Kai wrote:
>> When I read the file  meta/class/qmake-base.bbclass, I find that that
>> are 2 lines:
>>       unset QMAKESPEC || true
>>       ${OE_QMAKE_QMAKE} -makefile -spec ${QMAKESPEC} -o Makefile
>> calling ${OE_QMAKE_QMAKE} on $PROFILES"
>> I am confused that why unset QMAKESPEC first and then use it a argument
>> for qmake?
> It's not obvious, but think that the difference here is between $QMAKESPEC and
> ${QMAKESPEC} - the first one is a reference to an environment variable, the
> second is a reference to an OE/BitBake variable. So "unset QMAKESPEC" is just
> clearing out the environment variable; ${QMAKESPEC} would still have a value.
> Cheers,
> Paul
Hi Paul,

Thanks for your detailed answer.


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