Imported Upstream version 6.4.0.137

Former-commit-id: 943baa9f16a098c33e129777827f3a9d20da00d6

mcs/class/System.Private.CoreLib/System.Globalization/GlobalizationMode.Unix.cs

@@ -0,0 +1,33 @@
+// Licensed to the .NET Foundation under one or more agreements.
+// The .NET Foundation licenses this file to you under the MIT license.
+// See the LICENSE file in the project root for more information.
+
+using System.Runtime.CompilerServices;
+
+namespace System.Globalization
+{
+	partial class GlobalizationMode
+	{
+		static bool GetGlobalizationInvariantMode ()
+		{
+			bool invariantEnabled = GetInvariantSwitchValue ();
+			if (invariantEnabled)
+				return true;
+
+			LoadICU ();
+			return false;
+		}
+
+		// Keep this in a separate method to avoid loading the native lib in invariant mode
+		[MethodImplAttribute (MethodImplOptions.NoInlining)]
+		static void LoadICU ()
+		{
+			int res = Interop.Globalization.LoadICU ();
+			if (res == 0) {
+				string message = "Couldn't find a valid ICU package installed on the system. " +
+					"Set the configuration flag System.Globalization.Invariant to true if you want to run with no globalization support.";
+				Environment.FailFast (message);
+			}
+		}
+	}
+}