Sort requirements in Gem::Requirement to succeed comparison with different order

bundler/lib/bundler/rubygems_ext.rb

@@ -129,6 +129,35 @@ def to_lock
     end
   end
 
+  # comparison is done order independently since rubygems 3.2.0.rc.2
+  unless Gem::Requirement.new("> 1", "< 2") == Gem::Requirement.new("< 2", "> 1")
+    class Requirement
+      module OrderIndependentComparison
+        def ==(other)
+          if _requirements_sorted? && other._requirements_sorted?
+            super
+          else
+            _with_sorted_requirements == other._with_sorted_requirements
+          end
+        end
+
+        protected
+
+        def _requirements_sorted?
+          return @_are_requirements_sorted if defined?(@_are_requirements_sorted)
+          strings = as_list
+          @_are_requirements_sorted = strings == strings.sort
+        end
+
+        def _with_sorted_requirements
+          @_with_sorted_requirements ||= _requirements_sorted? ? self : self.class.new(as_list.sort)
+        end
+      end
+
+      prepend OrderIndependentComparison
+    end
+  end
+
   class Platform
     JAVA  = Gem::Platform.new("java") unless defined?(JAVA)
     MSWIN = Gem::Platform.new("mswin32") unless defined?(MSWIN)

bundler/spec/install/gemfile/platform_spec.rb

@@ -256,6 +256,35 @@
     expect(the_bundle).not_to include_gem "CFPropertyList"
   end
 
+  it "works with gems with platform-specific dependency having different requirements order" do
+    simulate_platform x64_mac
+
+    update_repo2 do
+      build_gem "fspath", "3"
+      build_gem "image_optim_pack", "1.2.3" do |s|
+        s.add_runtime_dependency "fspath", ">= 2.1", "< 4"
+      end
+      build_gem "image_optim_pack", "1.2.3" do |s|
+        s.platform = "universal-darwin"
+        s.add_runtime_dependency "fspath", "< 4", ">= 2.1"
+      end
+    end
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo2)}"
+    G
+
+    install_gemfile <<-G
+      source "#{file_uri_for(gem_repo2)}"
+
+      gem "image_optim_pack"
+    G
+
+    expect(err).not_to include "Unable to use the platform-specific"
+
+    expect(the_bundle).to include_gem "image_optim_pack 1.2.3 universal-darwin"
+  end
+
   it "fetches gems again after changing the version of Ruby" do
     gemfile <<-G
       source "#{file_uri_for(gem_repo1)}"

lib/rubygems/requirement.rb

@@ -270,7 +270,7 @@ def ==(other) # :nodoc:
     return unless Gem::Requirement === other
 
     # An == check is always necessary
-    return false unless requirements == other.requirements
+    return false unless _sorted_requirements == other._sorted_requirements
 
     # An == check is sufficient unless any requirements use ~>
     return true unless _tilde_requirements.any?
@@ -282,8 +282,12 @@ def ==(other) # :nodoc:
 
   protected
 
+  def _sorted_requirements
+    @_sorted_requirements ||= requirements.sort_by(&:to_s)
+  end
+
   def _tilde_requirements
-    requirements.select {|r| r.first == "~>" }
+    @_tilde_requirements ||= _sorted_requirements.select {|r| r.first == "~>" }
   end
 
   private

test/rubygems/test_gem_requirement.rb

@@ -22,6 +22,8 @@ def test_equals2
     refute_requirement_equal "~> 1.3", "~> 1.3.0"
     refute_requirement_equal "~> 1.3.0", "~> 1.3"
 
+    assert_requirement_equal ["> 2", "~> 1.3", "~> 1.3.1"], ["~> 1.3.1", "~> 1.3", "> 2"]
+
     assert_requirement_equal ["> 2", "~> 1.3"], ["> 2.0", "~> 1.3"]
     assert_requirement_equal ["> 2.0", "~> 1.3"], ["> 2", "~> 1.3"]