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Granular building

From: Psionic K
Subject: Granular building
Date: Tue, 16 Jan 2024 16:07:39 +0900

I was just curiously looking around and saw in a thread:

> It seems that emba.gnu.org suffers from severe overload


I have worked on some granular caching of build outputs in Nix.  Since it's pure, the result is mostly referentially transparent with the cache, which allows skipping work.  (There is known impurity remaining in Emacs and Guix)

The catch is that the work has to be isolated into several independent derivations for any useful caching to occur.

How apt is the Emacs build to being broken up and where are the obvious boundaries  that would cut down build time?

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