Two stage Ruby compilation / Bootstrapping

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Hi all,

Ruby upstream is implementing more and more stuff directly in Ruby. We
already had issues, that build of Ruby required Ruby when we did some
modifications [1]. In subsequent ticket, one of Ruby committers said [2]:

> ... snip ...
> BASERUBY is already a build requirement
> ... snip ...
> I would like to implement more of Ruby using Ruby, so miniruby may
depend on prelude one day.

With recent changes, such as [3], I am afraid that the day has come.

Previously, if you wanted to patch lets say "gem_prelude.rb", it was
enough to patch it. But now you *need* Ruby to process it into
miniprelude.c. There are possibly 4 ways out of this.

1) Build Ruby in two stages. a) build (mini)ruby, apply patches b) build
Ruby using the previously built (mini)ruby.

2) Use previous version of Ruby available in Fedora to bootstrap Ruby.
But this does not work ATM, at least when RubyGems are installed. And
upstream is doing what they can to make RubyGems inseparable [4].

3) Prepare patches locally and apply the required changes also to the
pregenerated files. But the problem here is, that the patches might
unpredictably fail between updates. I don't think that they keep any
API/ABI promises for the tools used to generate those files.

4) Don't use the upstream tarball, but generate it from sources with
patches integrated.

I think we should probably start to take look at 1), specifically into
the *miniruby* variant if that is enough. If that is done, the 2) could
optionally blend in. And in the mean time use 3) because otherwise I
really don't know how to integrate the ABRT hook support. I don't like
4) at all, unless we have some Fedora standardized way of doing so.

On the positive side, 1(2) would allow us to stay better in line with
"Pregenerated code" guidelines [5], because there is already quite a lot
of pre-generated code shipped in Ruby release tarball.


Thoughts?


Vít


[1]
https://src.fedoraproject.org/rpms/ruby/c/c0513dfb8c81a228619c6142195c5117aa0d1228

[2] https://bugs.ruby-lang.org/issues/15306#note-1

[3] https://github.com/ruby/ruby/pull/2655

[4] https://bugs.ruby-lang.org/issues/16431

[5]
https://docs.fedoraproject.org/en-US/packaging-guidelines/what-can-be-packaged/#_pregenerated_code


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