[TargetInstaller] Pass the language on target creation

lib/cocoapods/installer/target_installer.rb

@@ -40,7 +40,8 @@ module Pod
         name = target.label
         platform = target.platform.name
         deployment_target = target.platform.deployment_target.to_s
-        @native_target = project.new_target(product_type, name, platform, deployment_target)
+        language = target.uses_swift? ? :swift : :objc
+        @native_target = project.new_target(product_type, name, platform, deployment_target, nil, language)
 
         product_name = target.product_name
         product = @native_target.product_reference

spec/unit/installer/target_installer_spec.rb

@@ -44,5 +44,17 @@ module Pod
       @installer.send(:native_target).resolved_build_setting('OTHER_LDFLAGS').values.uniq.should == ['']
       @installer.send(:native_target).resolved_build_setting('OTHER_LIBTOOLFLAGS').values.uniq.should == ['']
     end
+
+    it 'adds Swift-specific build settings to the build settings' do
+      @pod_target.stubs(:requires_frameworks?).returns(true)
+      @pod_target.stubs(:uses_swift?).returns(true)
+      @installer.send(:add_target)
+      @installer.send(:native_target).resolved_build_setting('SWIFT_OPTIMIZATION_LEVEL').should == {
+        'Release' => nil,
+        'Debug' => '-Onone',
+        'Test' => nil,
+        'AppStore' => nil,
+      }
+    end
   end
 end