From: eregontp@... Date: 2020-06-15T18:59:06+00:00 Subject: [ruby-core:98812] [Ruby master Bug#16951] Consistently referer dependencies Issue #16951 has been updated by Eregon (Benoit Daloze). deivid (David Rodr�guez) wrote in #note-1: > Had dependant gems had their dependency explicited in their `gemspec` as `s.add_dependency "bigdecimal", "~> 1.0"`, no breakage would've occurred. OTOH bigdecimal 1.x will probably not work on the newer Ruby versions, so it's not great either. But at least it'd break when trying to support a new Ruby version, not before, which is nice. I'm concerned that C extensions of default gems are only tested against the latest Ruby, and so e.g., might not work on older Rubies. Also stdlibs can have a different implementation in alternative Ruby implementations if wanted/needed, but that becomes not possible/hacky if there is an explicit dependency on a default gem like bigdecimal ~> 1.0. Take the example of JRuby and the bigdecimal gem for instance, it fails to `gem install`. The way forward is probably to explicitly handle alternative Ruby implementations in all default gems as needed (which might be by using the vendored/stdlib version of BigDecimal on JRuby, but then it might not actually use the expected version of bigdecimal). Also, I feel not specifying dependencies of the stdlib gems is better in the sense that it will use the version of the default gem that's shipped with that Ruby, and was extensively tested. Using any other version will not achieve the same level of testing, and risk incompatibilities. I guess any way long term all default/bundled gems will need support for alternative implementations more explicitly, but right now it's just not the case. Regarding TruffleRuby we plan to support default gems C extensions as much as possible, yet it might be difficult for some default gems because some of them reach very deep in the MRI implementation, more than the average gem with a C extension. @headius Any thoughts on this? ---------------------------------------- Bug #16951: Consistently referer dependencies https://bugs.ruby-lang.org/issues/16951#change-86174 * Author: vo.x (Vit Ondruch) * Status: Open * Priority: Normal * ruby -v: ruby 2.7.1p83 (2020-03-31 revision a0c7c23c9c) [x86_64-linux] * Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN ---------------------------------------- It seems that the default gems interdependencies in Ruby are mess. Years ago, when JSON was merged into StdLib, there was big movement and everybody dropped their references to JSON "because it is part of StdLib and therefore it is not needed". I always thought that removing the references was mistake. Now, there are other interesting cases. Let me name two I know about: 1) REXML is going to be removed from default gems in Ruby 2.8, so some packages already started to introduce the dependency explicitly [1]. So once somebody uses Kramdown on older Ruby, the external REXML of whatever version is going to be used. 2) There are also gems in StdLib, such as IRB, which are specifying their dependencies in .gemspec file. This is unfortunately causing very inconsistent user experience, depending if RubyGems are enabled/disabled, if one is using Bundler or not, if somebody explicitly states something somewhere and what dependencies are transitively pulled in. I would really appreciate, if Ruby upstream finally paid attention to this problem. My suggestion is that if some gem depends on some other gem, this dependency should be always explicitly stated in the .gemspec file. This would provide clear precedence and guideline to others. This would save all possible surprises and hidden issues, suddenly using dependency of different version, which is pulled in transitively. [1]: https://github.com/gettalong/kramdown/commit/c1aa6ad98fab589050ab8e82897ec4b7a3850b89 -- https://bugs.ruby-lang.org/ Unsubscribe: