[ruby-core:119324] [Ruby master Bug#20714] Handle optional dependencies in `bundled_gems.rb`

Issue #20714 has been updated by deivid (David Rodr=EDguez).


I meant that I think in Ruby 3.4 (prior to my patch), the warning would als=
o apply to non Bundler contexts that lead to a `LoadError`, where it would =
inform that `csv` may not always be present and may need an explicit instal=
l from RubyGems.org. But I have not tried this myself, just assumed it from=
 reading the code, so maybe I misunderstood.

By the way, I share @Earlopain's questions about the additional patch intro=
duced after https://github.com/ruby/ruby/pull/11550.

----------------------------------------
Bug #20714: Handle optional dependencies in `bundled_gems.rb`
https://bugs.ruby-lang.org/issues/20714#change-109940

* 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
----------------------------------------
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 i=
f it is.

The way to accomplish that right now seems to be by setting `$VERBOSE =3D n=
il` and resetting it later again to not bother the user with the warning ab=
out the gem. However, this has the effect of silencing the warning about ot=
her gems as well, that may not be prepared about the bundling.=20

>>From `ruby/reline` for example: https://github.com/ruby/reline/blob/c90f08f=
7e308d2f1cdd7cfaf9939fe45ce546fd2/lib/reline/terminfo.rb#L1-L15
Or the `logging` gem: https://github.com/TwP/logging/blob/df41715364f7eb8c6=
5098cd3c3316677ef1f3784/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



--=20
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