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From: Andrea Corallo <akrl@sdf.org>
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Subject: Re: Speeding up the bootstrap build - a quick hack.
Date: Tue, 18 Jan 2022 16:09:53 +0000
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Cc: Alan Mackenzie <acm@muc.de>, Stefan Monnier <monnier@iro.umontreal.ca>,
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To: Robert Pluim <rpluim@gmail.com>
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Robert Pluim <rpluim@gmail.com> writes:

>>>>>> On Tue, 18 Jan 2022 09:24:04 -0500, Stefan Monnier <monnier@iro.umon=
treal.ca> said:
>
>     >> So if you ensured that the native compiler files were built before
>     >> that problematic .elc, then things would be ok?
>
>     Stefan> The problem is that you need one rule
>
>     Stefan>     bytecomp.elc: bytecomp.el
>     Stefan>         ELC ...
>
>     Stefan> to build the byte-compiled compiler, and then another rule:
>
>     Stefan>     bytecomp.elc: bytecomp.el bytecomp.elc comp.elc macroexp.=
elc cconv.elc ...
>     Stefan>         ELC+ELN ...
>
>     Stefan> to build the native compiled compiler using the byte-compiled=
 compiler
>     Stefan> (which is much faster than the interpreted compiler).
>
> Ah, we=CA=BCre lying to make. No wonder we=CA=BCre having problems :-)
>
>     Stefan> In an ideal world the second rule would not have `bytecomp.el=
c` as its
>     Stefan> target but would have something like `bytecomp.eln` instead, =
but we have
>     Stefan> not yet been able to teach Make how to compute the name of th=
e generated
>     Stefan> `.eln` file (it's not just `bytecomp.eln` but includes some h=
ash of the
>     Stefan> Emacs binary).
>
> There=CA=BCs no other file or directory name that contains that hash? Cou=
ld
> we do a dummy compile of an empty .el using the native compiler and
> derive the hash from that? (and then compile the native compiler with
> the byte compiler).
>
> Robert

Part of the hash is computed also using the content of the .el file so
the empty .el trick would not work.

  Andrea