Hi all, I would like to extend the OpenWRT build system to allow a substantial speed-up with optional pre-built binary injection. The goal is to perform the full distro build including toolchain in less than 10 min for the product that we develop.
My proposal is to augment the build so that build results can optionally be published of fetched. Locally compiled build results can be published for potential fetch and injection on future builds by other developers or build slaves. Above all the implementation should guarantee repeatability and consistency. A fetch and inject speed up will only be allowed if it does not violate this requirement. So far I have come up with the idea to guarantee this by publishing build results under a strong hash (sha1 or better). The hash is based on the source state of what needs to be built, and the hashes of all dependencies and configuration leading up to that (Something similar to what git does to calculate a commit id). If the calculated hash for what has to be built can be fetched and injected, consistency is guaranteed and the speedup is safe. If the calculated hash has not been built before, the build step is performed and the result is published under the calculated hash. Can anyone comment on the above? Regards, Pieter Smith P.S. If I missed something existing that can already achieve some of the build speed-up, please let me know. _______________________________________________ openwrt-devel mailing list openwrt-devel@lists.openwrt.org https://lists.openwrt.org/mailman/listinfo/openwrt-devel
