[ruby-core:119357] [Ruby master Bug#20714] Handle optional dependencies in `bundled_gems.rb`

["Earlopain (A S) via ruby-core" <ruby-core@ml.ruby-lang.org>]

Issue #20714 has been updated by Earlopain (A S).


I apologize for my tone, I will try to be more understanding. I am just a bit frustrated with the warnings in general, especially with the ones that were backported 3.3.5. I know it is already reverted but they do still happen now.

It would have been nicer if you instead made your changes as a PR so that others could have given feedback instead of checking latest commits and writing about it here after.

Anyways, let's see if others have an opinion. I'll just take it as it comes now.

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Bug #20714: Handle optional dependencies in `bundled_gems.rb`
https://bugs.ruby-lang.org/issues/20714#change-109969

* Author: Earlopain (A S)
* 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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