i *know* i should know the answer to this, but someone just showed
me a build (WRLinux-based, but still relevant) where the linux kernel
recipe uses:
SRCREV_machine = ${AUTOREV}
which is what one reads in the WRL version of linux-yocto-custom.bb,
but also makes it clear in that recipe file that that is discouraged.
in any event, this appears to be forcing an entire rebuild of the
kernel every time, even in the presence of sstate-cache, so the
obvious question is, what is it about using ${AUTOREV} that defeats
the use of sstate-cache? apologies if this should be obvious.
rday
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