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

[Robert Pluim <rpluim@gmail.com>]

>>>>> On Tue, 18 Jan 2022 15:35:42 +0100, Robert Pluim <rpluim@gmail.com> said:
    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).

    Robert> Thereʼs no other file or directory name that contains that hash? Could
    Robert> we do a dummy compile of an empty .el using the native compiler and
    Robert> derive the hash from that? (and then compile the native compiler with
    Robert> the byte compiler).

Answering my own question:

src/emacs -batch --eval '(message "%s" (comp-el-to-eln-filename \
"./lisp/emacs-lisp/bytecomp.el" (car (last \
native-comp-eln-load-path))))' 2>&1

seems to give the right answer.

Robert
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