1 files changed, 7 insertions, 60 deletions
diff --git a/lib/rubygems/installer.rb b/lib/rubygems/installer.rb
index f8a520d344..49ad7dfae5 100644
--- a/lib/rubygems/installer.rb
+++ b/lib/rubygems/installer.rb
@@ -661,73 +661,20 @@ TEXT
   # configure scripts and rakefiles or mkrf_conf files.
 
   def build_extensions
-    return if spec.extensions.empty?
+    builder = Gem::Ext::Builder.new spec, @build_args
 
-    if @build_args.empty?
-      say "Building native extensions.  This could take a while..."
-    else
-      say "Building native extensions with: '#{@build_args.join(' ')}'"
-      say "This could take a while..."
-    end
-
-    dest_path = File.join gem_dir, spec.require_paths.first
-    ran_rake = false # only run rake once
-
-    spec.extensions.each do |extension|
-      break if ran_rake
-      results = []
-
-      extension ||= ""
-      extension_dir = File.join gem_dir, File.dirname(extension)
-
-      builder = case extension
-                when /extconf/ then
-                  Gem::Ext::ExtConfBuilder
-                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
-                else
-                  message = "No builder for extension '#{extension}'"
-                  extension_build_error extension_dir, message
-                end
-
-      begin
-        FileUtils.mkdir_p dest_path
-
-        Dir.chdir extension_dir do
-          results = builder.build(extension, gem_dir, dest_path,
-                                  results, @build_args)
-
-          say results.join("\n") if Gem.configuration.really_verbose
-        end
-      rescue
-        extension_build_error(extension_dir, results.join("\n"), $@)
-      end
-    end
+    builder.build_extensions
   end
 
   ##
   # Logs the build +output+ in +build_dir+, then raises ExtensionBuildError.
+  #
+  # TODO:  Delete this for RubyGems 3.  It remains for API compatibility
 
-  def extension_build_error(build_dir, output, backtrace = nil)
-    gem_make_out = File.join build_dir, 'gem_make.out'
-
-    open gem_make_out, 'wb' do |io| io.puts output end
-
-    message = <<-EOF
-ERROR: Failed to build gem native extension.
-
-    #{output}
-
-Gem files will remain installed in #{gem_dir} for inspection.
-Results logged to #{gem_make_out}
-EOF
+  def extension_build_error(build_dir, output, backtrace = nil) # :nodoc:
+    builder = Gem::Ext::Builder.new spec, @build_args
 
-    raise ExtensionBuildError, message, backtrace
+    builder.build_error build_dir, output, backtrace
   end
 
   ##