Try out TruffleRuby's lazy RubyGems against the family.

headius · headius · commit 87879a82aa75 · 2018-02-28T23:37:24.000-06:00
diff --git a/core/src/main/ruby/jruby/kernel/gem_prelude.rb b/core/src/main/ruby/jruby/kernel/gem_prelude.rb
@@ -1,15 +1,53 @@
-if defined?(Gem)
-  begin
-    require 'rubygems'
-  rescue LoadError
-    # For JRUBY-5333, gracefully fail to load, since stdlib may not be available
-    warn 'RubyGems not found; disabling gems' if $VERBOSE
-  else
+# Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved. This
+# code is released under a tri EPL/GPL/LGPL license. You can use it,
+# redistribute it and/or modify it under the terms of the:
+#
+# Eclipse Public License version 1.0
+# GNU General Public License version 2
+# GNU Lesser General Public License version 2.1
+
+module Kernel
+  # Take this alias name so RubyGems will reuse this copy
+  # and skip the method below once RubyGems is loaded.
+  alias :gem_original_require :require
+
+  private def require(path)
     begin
-      gem 'did_you_mean'
-      require 'did_you_mean'
-      Gem.clear_paths
-    rescue Gem::LoadError, LoadError
-    end if defined?(DidYouMean)
+      gem_original_require(path)
+    rescue LoadError
+      require 'rubygems'
+      require path
+    end
+  end
+
+  private def gem(*args)
+    require 'rubygems'
+    gem(*args)
   end
 end
+
+class Object
+  autoload :Gem, 'rubygems'
+
+  # RbConfig is required by RubyGems, which makes it available in Ruby by default.
+  # Autoload it since we do not load RubyGems eagerly.
+  # autoload :RbConfig, 'rbconfig'
+  # Defined by RbConfig
+  # autoload :CROSS_COMPILING, 'rbconfig'
+end
+
+# if defined?(Gem)
+#   begin
+#     require 'rubygems'
+#   rescue LoadError
+#     # For JRUBY-5333, gracefully fail to load, since stdlib may not be available
+#     warn 'RubyGems not found; disabling gems' if $VERBOSE
+#   else
+#     begin
+#       gem 'did_you_mean'
+#       require 'did_you_mean'
+#       Gem.clear_paths
+#     rescue Gem::LoadError, LoadError
+#     end if defined?(DidYouMean)
+#   end
+# end
