Re: Crystal Bootstrapping Journey

[Leo Prikler]

Hi jgarte et al.

Am Montag, den 21.06.2021, 16:33 +0000 schrieb jgart:
> Hi Guix,
> 
> We've (Ryan, David, Raghav, and others) started packaging crystal for
> guix: https://crystal-lang.org/
> 
> See 49142 and 49158 in the issue tracker.
> 
> Here are some notes, questions, and a list of dependencies regarding
> what is needed to finish a properly bootstraped crystal package:
> 
> https://github.com/ryanprior/guix-packages/blob/master/testing/crystal.org
> 
> We are trying to recreate this bootstrapping process:
> 
> https://github.com/crystal-lang/bootstrap-script
> 
> There are 160 stages!
> 
> A few questions extracted from the notes follow:
> 
> Is it preferable to have 160 bootstrap packages, one for each stage,
> or one big bootstrap package with 160 build-* stages, or somewhere
> inbetween?
I second Maxime's reply on 49158.  159 hidden packages, plus a final
exported one.

> Each stage needs a different checkout of the git repository - can we
> preserve info in .git such that we can checkout again during the
> build, or do we want to have each checkout be an independent input to
> the package?
Given that we want 160 packages, maybe, but actually no.

> How best can we use Guile macros to clean up the large amount of code
> implied by executing 160 stages of bootstrap logic?
Note how many of the stages (particularly later ones) manage to
bootstrap one version from the previous.  You might therefore want to
make a "one-liner" package 
(define crystal-stage-N (bootstrap-crystal "version@N" crystal-stage-
{N-1}))
Then use Emacs macros to generate 160 lines ;P

It's not quite as simple, because the arguments to crystal change at
some point, but you could spawn off several "phases" from a relative
generic boostrap-crystal procedure.  E.g. the final phase would have
#:crystal-args '("build" "--stats" "-Dwithout_openssl" "-Dwithout_zlib" 
"-Di_know_what_im_doing")

Regards,
Leo