Remove special behavior for rake

lib/rubygems/ext/builder.rb

@@ -163,8 +163,6 @@ def initialize(spec, build_args = spec.build_args, target_rbconfig = Gem.target_
     @gem_dir    = spec.full_gem_path
     @target_rbconfig = target_rbconfig
     @build_jobs = build_jobs
-
-    @ran_rake = false
   end
 
   ##
@@ -177,7 +175,6 @@ def builder_for(extension) # :nodoc:
     when /configure/ then
       Gem::Ext::ConfigureBuilder
     when /rakefile/i, /mkrf_conf/i then
-      @ran_rake = true
       Gem::Ext::RakeBuilder
     when /CMakeLists.txt/ then
       Gem::Ext::CmakeBuilder.new
@@ -250,8 +247,6 @@ def build_extensions
     FileUtils.rm_f @spec.gem_build_complete_path
 
     @spec.extensions.each do |extension|
-      break if @ran_rake
-
       build_extension extension, dest_path
     end
 

test/rubygems/test_gem_ext_builder.rb

@@ -18,7 +18,7 @@ def setup
 
     @spec = util_spec "a"
 
-    @builder = Gem::Ext::Builder.new @spec, ""
+    @builder = Gem::Ext::Builder.new @spec
   end
 
   def teardown
@@ -201,6 +201,57 @@ def test_build_extensions_install_ext_only
     Gem.configuration.install_extension_in_lib = @orig_install_extension_in_lib
   end
 
+  def test_build_multiple_extensions
+    pend if RUBY_ENGINE == "truffleruby"
+    pend "terminates on ruby/ruby" if ruby_repo?
+
+    extension_in_lib do
+      @spec.extensions << "ext/Rakefile"
+      @spec.extensions << "ext/extconf.rb"
+
+      ext_dir = File.join @spec.gem_dir, "ext"
+
+      FileUtils.mkdir_p ext_dir
+
+      extconf_rb = File.join ext_dir, "extconf.rb"
+      rakefile = File.join ext_dir, "Rakefile"
+
+      File.open extconf_rb, "w" do |f|
+        f.write <<-'RUBY'
+          require 'mkmf'
+
+          create_makefile 'a'
+        RUBY
+      end
+
+      File.open rakefile, "w" do |f|
+        f.write <<-RUBY
+          task :default do
+            FileUtils.touch File.join "#{ext_dir}", 'foo'
+          end
+        RUBY
+      end
+
+      ext_lib_dir = File.join ext_dir, "lib"
+      FileUtils.mkdir ext_lib_dir
+      FileUtils.touch File.join ext_lib_dir, "a.rb"
+      FileUtils.mkdir File.join ext_lib_dir, "a"
+      FileUtils.touch File.join ext_lib_dir, "a", "b.rb"
+
+      use_ui @ui do
+        @builder.build_extensions
+      end
+
+      assert_path_exist @spec.extension_dir
+      assert_path_exist @spec.gem_build_complete_path
+      assert_path_exist File.join @spec.gem_dir, "ext", "foo"
+      assert_path_exist File.join @spec.extension_dir, "gem_make.out"
+      assert_path_exist File.join @spec.extension_dir, "a.rb"
+      assert_path_exist File.join @spec.gem_dir, "lib", "a.rb"
+      assert_path_exist File.join @spec.gem_dir, "lib", "a", "b.rb"
+    end
+  end
+
   def test_build_extensions_none
     use_ui @ui do
       @builder.build_extensions