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

[Robert Pluim]

>>>>> On Thu, 20 Jan 2022 14:18:15 +0100, Robert Pluim <rpluim@gmail.com> said:

>>>>> On Thu, 20 Jan 2022 11:35:17 +0000, Alan Mackenzie <acm@muc.de> said:
    Alan> Thank you indeed.  That's exactly what I needed.  I've amended my 
patch to use
    Alan> this.

    Alan> So, if there are no objections, I'll be committing the following to
    Alan> master within the next day or so:

    Robert> I think it could be improved further to avoid having two sub-make
    Robert> invocations (and remove the need for ANCIENT), but that would be a
    Robert> bigger and finicky change, so I say go ahead with this for now.

One small issue. I have

make --version
GNU Make 4.3
Built for x86_64-pc-linux-gnu

which gives me:

touch -t 197001010000 emacs-lisp/macroexp.elc
make[2]: emacs-lisp/macroexp.elc: Timestamp out of range; substituting 
2514-05-30 03:53:03.999999999

Using '197101010000' instead causes no diagnostics.

Robert
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