Re: Speeding up the bootstrap build - a quick hack.

[Robert Pluim]

>>>>> On Tue, 18 Jan 2022 09:24:04 -0500, Stefan Monnier 
>>>>> <monnier@iro.umontreal.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, weʼre lying to make. No wonder weʼre having problems :-)

    Stefan> In an ideal world the second rule would not have `bytecomp.elc` 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 the 
generated
    Stefan> `.eln` file (it's not just `bytecomp.eln` but includes some hash of 
the
    Stefan> Emacs binary).

Thereʼs no other file or directory name that contains that hash? Could
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
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