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If -f is specified, force dependent tasks to be re-run next time. This works by changing the force behaviour so that instead of deleting the task's stamp, we write a "taint" file into the stamps directory, which will alter the taskhash randomly and thus trigger the task to re-run next time we evaluate whether or not that should be done as well as influencing the taskhashes of any dependent tasks so that they are similarly re-triggered. As a bonus because we write this file as <stamp file name>.taskname.taint, the existing code which deletes the stamp files in OE's do_clean will already handle removing it. This means you can now do the following: bitbake somepackage [ change the source code in the package's WORKDIR ] bitbake -c compile -f somepackage bitbake somepackage and the result will be that all of the tasks that depend on do_compile (do_install, do_package, etc.) will be re-run in the last step. Note that to operate in the manner described above you need full hashing enabled (i.e. BB_SIGNATURE_HANDLER must be set to a signature handler that inherits from BasicHash). If this is not the case, -f will just delete the stamp for the specified task as it did before. This fix is required for [YOCTO #2615] and [YOCTO #2256]. (Bitbake rev: f7b55a94226f9acd985f87946e26d01bd86a35bb) Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>