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
> $QMAKE_VARSUBST_PRE $AFTER $PROFILES $QMAKE_VARSUBST_POST || die "Error
> 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
--
Paul Eggleton
Intel Open Source Technology Centre
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