kernel: prevent additional config from being always rebuilt
* A simple "make kernel" or incremental system build
always triggers a complete kernel recompilation,
even though the kernel sources were unchanged
* The reason is because .additional_config is always
considered new and invalidates the .config file,
forcing the kernel to rebuild itself every time
* Instead, prevent the /dev/null and KERNEL_OBJ dependencies
having irrelevant timestamp changes with an empty variable
* Command "make kernel" takes 3 seconds versus 40s before
Change-Id: I3b583077b7ef5873eebde3e4b0e790f5d7587ed3
Signed-off-by: Adrian DC <radian.dc@gmail.com>
1 file changed