Re: More reliable byte compilation, take 45

[Steingold]

> * Lars Ingebrigtsen <ynefv@tahf.bet> [2021-10-04 19:35:36 +0200]:
>
> Steingold <sds@gnu.org> writes:
>
>> When the byte compiler sees `(require 'foo)`, it will check that `foo.ell`
>> has changed since last loaded and will reload it automatically.
>
> Nothing requires subr.el -- it's prebuilt, but everything uses functions
> from it.  Recompiling everything after changing anything in subr.el
> would make development impossible.

Change subr.el.
Recompile it.
See if subr.ell has changed (the compiler should not change subr.ell
unless necessary, including the timestamp).
If it did, everything needs to be recompiled.
If it did not, no action is necessary.

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Sam Steingold (http://sds.podval.org/) on darwin Ns 10.3.1894
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