Install extension gems into separate directories for each Ruby version

[vitallium]

Description

Currently, extension gems are installed into a common directory regardless of the Ruby version in use. This can cause conflicts or compatibility issues when multiple Ruby versions are installed on the same machine.

The proposal is to install gems into separate directories for each Ruby version and platform. This can be done by extracting the Ruby version number and platform information from the output of ruby --version. For example, from:

ruby 3.4.4 (2025-05-14 revision a38531fd3f) +PRISM [arm64-darwin24]

extract 3.4.4-arm64-darwin24 and use this as the directory name for that Ruby version’s gems.

This approach will isolate gems per Ruby version and platform, preventing conflicts and improving stability when multiple Ruby versions are used on the same system.

Resources

• https://github.com/adam12/ruby-lsp.nvim?tab=readme-ov-file#why

[joshuay03]

Currently, extension gems are installed into a common directory regardless of the Ruby version in use. This can cause conflicts or compatibility issues when multiple Ruby versions are installed on the same machine.

I think this is what I ran into when I upgraded Ruby from 3.4.4 to 3.4.5 using mise. Reloading the Zed workspace did not help.

Language server ruby-lsp:

initializing server ruby-lsp, id 1
-- stderr--
Ruby LSP> Skipping composed bundle setup since /Users/joshuayoung/Projects/buildkite/buildkite/.ruby-lsp/Gemfile.lock already exists and is up to date
Ruby LSP> Running bundle install for the composed bundle. This may take a while...
Ruby LSP> Command: (/Users/joshuayoung/.local/share/mise/installs/ruby/3.4.4/bin/ruby /Users/joshuayoung/.local/share/mise/installs/ruby/3.4.4/bin/bundle _2.6.9_ check || /Users/joshuayoung/.local/share/mise/installs/ruby/3.4.4/bin/ruby /Users/joshuayoung/.local/share/mise/installs/ruby/3.4.4/bin/bundle _2.6.9_ install) 1>&2
--- ERROR REPORT TEMPLATE -------------------------------------------------------

LoadError: linked to incompatible /Users/joshuayoung/.local/share/mise/installs/ruby/3.4.5/lib/libruby.3.4.dylib - /Users/joshuayoung/Projects/buildkite/buildkite/.bundle/ruby/3.4.0/gems/zlib-3.2.1/lib/zlib.bundle
  <internal:/Users/joshuayoung/.local/share/mise/installs/ruby/3.4.4/lib/ruby/site_ruby/3.4.0/rubygems/core_ext/kernel_require.rb>:136:in 'Kernel#require'
  ...