Expose the <ReferenceOutputAssembly> setting in the SharpDevelop UI.

data/resources/StringResources.resx

@@ -4236,6 +4236,16 @@ Only letters, digits, space, '.' or '_' are allowed.</value>
     <value>The public key token</value>
     <comment>Assembly reference's public key token property description</comment>
   </data>
+  <data name="ICSharpCode.SharpDevelop.Internal.Project.ProjectReference.ReferenceOutputAssembly" xml:space="preserve">
+    <value>Reference assembly</value>
+    <comment>'Reference' is a verb in this case.
+This string appears in the property pad when a project reference is selected in the projects pad.
+It is a boolean option that defaults to true.
+If set to false, this reference specifies only a build-order dependency and does not cause the assembly to be referenced.</comment>
+  </data>
+  <data name="ICSharpCode.SharpDevelop.Internal.Project.ProjectReference.ReferenceOutputAssembly.Description" xml:space="preserve">
+    <value>If set to false, this reference specifies only a build-order dependency and does not cause the assembly to be referenced.</value>
+  </data>
   <data name="ICSharpCode.SharpDevelop.Internal.Project.ProjectReference.SpecificVersion" xml:space="preserve">
     <value>Specific Version</value>
     <comment>Reference property name indicating if the reference is to a specific version</comment>

src/Main/Base/Project/Src/Project/Items/ProjectReferenceProjectItem.cs

@@ -5,6 +5,7 @@ using System;
 using System.ComponentModel;
 using System.IO;
 using ICSharpCode.Core;
+using ICSharpCode.SharpDevelop.Gui;
 
 namespace ICSharpCode.SharpDevelop.Project
 {
@@ -41,6 +42,21 @@ namespace ICSharpCode.SharpDevelop.Project
 			}
 		}
 		
+		[DefaultValue(true)]
+		[LocalizedProperty("${res:ICSharpCode.SharpDevelop.Internal.Project.ProjectReference.ReferenceOutputAssembly}",
+		                   Description = "${res:ICSharpCode.SharpDevelop.Internal.Project.ProjectReference.ReferenceOutputAssembly.Description}")]
+		public bool ReferenceOutputAssembly {
+			get {
+				return GetEvaluatedMetadata("ReferenceOutputAssembly", true);
+			}
+			set {
+				if (value)
+					RemoveMetadata("ReferenceOutputAssembly");
+				else
+					SetEvaluatedMetadata("ReferenceOutputAssembly", "false");
+			}
+		}
+		
 		public override string ShortName {
 			get { return Path.GetFileNameWithoutExtension(Include); }
 		}