[ruby-core:122961] [Ruby Bug#21541] make install is failing due to using rdoc repo

Issue #21541 has been updated by Eregon (Benoit Daloze).


@MSP-Greg Could you make a PR adding a CI job to ruby/ruby that `make install` + run that [cli_test.rb](https://github.com/ruby/ruby-dev-builder/blob/master/cli_test.rb), like in https://github.com/ruby/ruby-dev-builder/actions/runs/16946820401/job/48029817265 ?
Then we should catch these issues directly in ruby/ruby which is better.
There is maybe/probably already a CI workflow doing `make install`, in that case just alter that one to run that extra test.

I think it should be generally agreed that executables shipped with Ruby should work and are worth checking in CI.
Maybe that test could even be part of ruby/spec (and potentially skipped if not `make install`-ed if that's a problem), but doesn't have to be. Could also be part of test-all under test/ruby or so.

FWIW we already have a similar test in truffleruby: https://github.com/oracle/truffleruby/blob/6e50bca7441b728207c2fb2bfaa51ae93830f475/spec/truffle/launcher_spec.rb#L20-L35

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Bug #21541: make install is failing due to using rdoc repo
https://bugs.ruby-lang.org/issues/21541#change-114266

* Author: MSP-Greg (Greg L)
* Status: Open
* ruby -v: master
* Backport: 3.2: UNKNOWN, 3.3: UNKNOWN, 3.4: UNKNOWN
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Currently, ruby-dev-builder & ruby-loco are failing due to https://github.com/ruby/ruby/commit/8f6f9e88c70bbae, which changed the rdoc 'bundled gem' install from using a released gem to the repo.  This results in an invalid rdoc installation.

RDoc contains *.ry and *.kpeg source files that need to be 'compiled' into *.rb files with racc and kpeg.

These *.rb files are not contained in the rdoc repo.

One possible change would be to have rdoc include the compiled *.rb files in its repo.  Puma has a similar issue with ragel files.  A GHA workflow (https://github.com/puma/puma/blob/master/.github/workflows/ragel.yml) checks that the compiled *.c file matches its respective *.rl source file.

Otherwise, a bit of code would be required in Ruby (and install of kpeg), or, rdoc must be installed from a released gem.



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