[gentoo-dev] Portage and languages with built-in cache support

["Anna (cybertailor) Vyalkova" <cyber+gentoo@sysrq.in>]

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.