[ruby-core:119915] [Ruby master Bug#20714] Handle optional dependencies in `bundled_gems.rb`

Issue #20714 has been updated by Earlopain (Earlopain _).


https://github.com/ruby/ruby/commit/8cd36a6dab170f4127c58c07b1a388dd3813fb7a removed the first batch of gems from the list of warnings. I agree with it and don't particularly care if these warn a few years after removal, as long as it stops at one point. The warning message is still confusing for future ruby versions though.

The issue I see with your PR is that for one version, they will still warn regardless. So, for a somewhat specific example:
* Some gem `x` requires `fidlde` and handles the potential `LoadError`
* Gem `x` starts to warn on Ruby 3.4, but this gem is already equiped to handle it. The warning is unnecessary
* Other gems loaded after `x` may also require `fiddle` but will not warn since the warning was already emitted
* On Ruby 3.5, gem `x` works and doesn't emit a warning anymore
* However, gems loaded after `x` will error if they failed to declare `fiddle` as their dependency

I guess you could just rely on the multitude of different gemfiles people have and guess that there is someone without gem `x` to report the warning to the other gem author. But I'm unsure if that is a safe bet to make.

I don't think you can properly handle it in `bundled_gems.rb` with what is currently available, the information about if a require should warn or not is simply not there.

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Bug #20714: Handle optional dependencies in `bundled_gems.rb`
https://bugs.ruby-lang.org/issues/20714#change-110636

* Author: Earlopain (Earlopain _)
* Status: Assigned
* Assignee: hsbt (Hiroshi SHIBATA)
* ruby -v: 3.3.5
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
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I've encountered a few places around bundled gems where the library doesn't care if the gem is available, but will still provide some functionallity if it is.

The way to accomplish that right now seems to be by setting `$VERBOSE = nil` and resetting it later again to not bother the user with the warning about the gem. However, this has the effect of silencing the warning about other gems as well, that may not be prepared about the bundling. 

>>From `ruby/reline` for example: https://github.com/ruby/reline/blob/c90f08f7e308d2f1cdd7cfaf9939fe45ce546fd2/lib/reline/terminfo.rb#L1-L15
Or the `logging` gem: https://github.com/TwP/logging/blob/df41715364f7eb8c65098cd3c3316677ef1f3784/lib/logging.rb#L9-L15

I propose to simply delay the warning to the next require.

GitHub PR at https://github.com/ruby/ruby/pull/11545



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