1069c36417
Currently if a multiconfig build contains different configurations which have overlapping sstate artefacts, it will build them multiple times. This is clearly suboptimal and not what users want/expect. This adds code to detect this and stall all but one of the setscne tasks so that once its built, it can be found by the other tasks. We take care to iterate the multiconfigs in order so try and avoid dependency loops. We also match on PN+taskname+taskhash since this is what we know sstate in OE-Core would use. There are some tasks even within a multiconfig which match hashes (mostly do_populate_lic tasks) but those have a much higher chance of circular dependency so aren't work attempting to optimise. If a deadlock does occur the build will be slower but there is code to unbreak such a deadlock so it hopefully doens't break anything. Comments are injected into the test tasks so they have different task hashes and a new test for this optimisation is added. (Bitbake rev: a75c5fd6d4ec56836de0be2fe679c81297a080ad) Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Bitbake
BitBake is a generic task execution engine that allows shell and Python tasks to be run efficiently and in parallel while working within complex inter-task dependency constraints. One of BitBake's main users, OpenEmbedded, takes this core and builds embedded Linux software stacks using a task-oriented approach.
For information about Bitbake, see the OpenEmbedded website: http://www.openembedded.org/
Bitbake plain documentation can be found under the doc directory or its integrated html version at the Yocto Project website: http://yoctoproject.org/documentation
Contributing
Please refer to http://www.openembedded.org/wiki/How_to_submit_a_patch_to_OpenEmbedded for guidelines on how to submit patches, just note that the latter documentation is intended for OpenEmbedded (and its core) not bitbake patches (bitbake-devel@lists.openembedded.org) but in general main guidelines apply. Once the commit(s) have been created, the way to send the patch is through git-send-email. For example, to send the last commit (HEAD) on current branch, type:
git send-email -M -1 --to bitbake-devel@lists.openembedded.org
Mailing list:
http://lists.openembedded.org/mailman/listinfo/bitbake-devel
Source code:
http://git.openembedded.org/bitbake/