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The kernel build is now more sensitive to changing build inputs, like the compiler, linker, source tree location, versions, file timestamps, etc. When a difference is detected, the kernel build invokes a syncconfig to update/regenerate files as required. That process may prompt, and hence breaks automated tested and other workflows. By default, we don't want this to happen so we make sure that auto* timestamps are newer or equal to the .config timestap, we ensure that autoconf.h is in the filesystem and that we've substituted the cross tools used to build the kernel with the names that will be on the target. (From OE-Core rev: 532ae127c52c9f7b1d2e4ca5cbca91881d23a2ac) Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>