[OpenWrt-Devel] project: build speed-up with binary injection

[Etienne Champetier]

Hi Pieter,

Le mer. 12 sept. 2018 à 15:20, Pieter Smith <pieter at boesman.nl> a écrit :
>
> 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.

Never tried it myself, but have you tried ccache ?

Regards
Etienne

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