[yocto] Devtool: Different binaries with and without devtool

[Mikael Pahmp]

Hi, using poky 2.4.1.

When building our custom linux kernel recipe with a fixed git hash for
SRCREV, compared to building it after "devtool modify  --no-extract" with
the same hash checked out, we get different binaries and the later doesn't
boot. This is our normal workflow and have worked fine for our first
MACHINE but we get this problem trying to get our second MACHINE arch
working.

Trying to find out what differs, we compared signatures in both cases using
bitbake-diffsigs and there were quite a lot of variable dependencies not
showing up when using devtool, e.g. some 'TUNE_... and ARM... variables.

Do you have any idea of what is going on?

/Mikael
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