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

[Stefan Monnier]

>> >> > -.PHONY: compile-first compile-main compile compile-always
>> >> > +.PHONY: compile-zeroth compile-first compile-main compile 
>> >> > compile-always
>
>> >> > -compile-first: $(COMPILE_FIRST)
>> >> > +compile-zeroth: $(COMPILE_ZEROTH)
>> >> > +compile-first: compile-zeroth $(COMPILE_FIRST)
>
>> >> Is this necessary, or is it just helpful to debug the Makefile?
>
>> > I'm not sure.  I'm a little confused, still.
>
> It seems to be necessary.  At any rate, changing the mix slightly gave
> rise to unwanted results.  In particular...
>
>> At least I can't see why `compile-first` should need to depend on
>> `compile-zeroth` since the
>
>>     %.elc: %.el $(COMPILE_ZEROTH)
>
> If I change that line to
>
>     %.elc: %.el compile-zeroth
>
> , then Emacs builds, but redundantly ELC's all the .el files which are
> preloaded, taking 15 seconds longer to do so.  I don't understand why
> this happens.
>
> Even more notably, if I eliminate compile-zeroth, putting in instead
> $(COMPILE_ZEROTH) everywhere needed, then make creates and deletes the
> ..elc0 files four times, and also redundantly runs ELC on the preloaded
> ..el files, despite them already being .eln's.  This run took 2½ minutes
> longer than expected, too.  I don't understand why all that happened,
> either.

But what if you don't define `compile-zeroth`, and you keep:

    compile-first: $(COMPILE_FIRST)

and

    %.elc: %.el $(COMPILE_ZEROTH)

?

>> rule should already give the same result.  So I'd suggest you drop
>> this part of the patch and see if that causes any kind of trouble.
> As above, it caused all sorts of trouble.

Maybe I'm confused but IIUC none of what you tried corresponds to just
not using the above hunk.


        Stefan