Hello,

Portage can use ccache and sccache to speed up builds, but some
languages (like Go and Nim) support caches out-of-the-box. It's not fair
that we can't use them.

I'd like to start discussion on this topic. What should be the preferred
method of handling build caches?

I think adding more stuff to Portage is a bad idea, and caches should be handled by corresponding "${lang}-utils" eclasses. It can be as simple
as checking some variable, passing necessary flags and placing a couple
of 'addwrite' calls for sandbox.

Of course, such feature needs to be strictly opt-in.

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On 2023-04-25 16:09, Maciej Barć wrote:

You would also have to have correct permissions on cache dirs
(root:portage or portage:portage) this also means that the cache dir
will have to be set during build explicitly.
Do both Nim and Go support setting it?

Yes. For Nim it would be something like that:

# nim.cfg
--nimcache:"${EPREFIX}/var/cache/nim/${CATEGORY}/${PN}"

And for Go:

export GOCACHE="${EPREFIX}/var/cache/go"

on some condition.

The only problem is, they don't support cleaning cache automatically. So
it needs to be done manually or with cron.

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On Wed, Apr 26, 2023 at 06:43:04PM +0500, Anna (cybertailor) Vyalkova wrote:

On 2023-04-25 16:09, Maciej Barć wrote:

You would also have to have correct permissions on cache dirs (root:portage or portage:portage) this also means that the cache dir
will have to be set during build explicitly.
Do both Nim and Go support setting it?

Yes. For Nim it would be something like that:

# nim.cfg
--nimcache:"${EPREFIX}/var/cache/nim/${CATEGORY}/${PN}"

And for Go:

export GOCACHE="${EPREFIX}/var/cache/go"

This would be very easy to do in the go-module eclass, but we would need
to test how it works with go upgrades. This cache is for compiled
objects, so I hope it would clean the cache and restart it with
every go upgrade since compiled go objects are not compatible between go versions.

William

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