Both semicolon and comma are valid separators.

ICSharpCode.NRefactory.CSharp/Refactoring/TypeSystemAstBuilder.cs

@@ -89,7 +89,7 @@ namespace ICSharpCode.NRefactory.CSharp.Refactoring
 		public bool ShowTypeParameters { get; set; }
 		
 		/// <summary>
-		/// Controls whether contraints on type parameter declarations are shown.
+		/// Controls whether constraints on type parameter declarations are shown.
 		/// Has no effect if ShowTypeParameters is false.
 		/// The default value is <c>true</c>.
 		/// </summary>

ICSharpCode.NRefactory.ConsistencyCheck/CSharpProject.cs

@@ -84,7 +84,7 @@ namespace ICSharpCode.NRefactory.ConsistencyCheck
 			this.CompilerSettings.AllowUnsafeBlocks = GetBoolProperty(msbuildProject, "AllowUnsafeBlocks") ?? false;
 			this.CompilerSettings.CheckForOverflow = GetBoolProperty(msbuildProject, "CheckForOverflowUnderflow") ?? false;
 			string defineConstants = msbuildProject.GetPropertyValue("DefineConstants");
-			foreach (string symbol in defineConstants.Split(new char[] { ';' }, StringSplitOptions.RemoveEmptyEntries))
+			foreach (string symbol in defineConstants.Split(new char[] { ';', ',' }, StringSplitOptions.RemoveEmptyEntries))
 				this.CompilerSettings.ConditionalSymbols.Add(symbol.Trim());
 			
 			// Initialize the unresolved type system