Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

mcs/build/common/basic-profile-check.cs

@@ -1,3 +1,5 @@
+using System;
+
 class X {
 	// Check installed compiler
 	static void Generic<T> ()
@@ -20,6 +22,27 @@ class X {
 		if (o == null)
 			return 1;
 
+		var consts = o.GetType ().Assembly.GetType ("Consts");
+		if (consts == null) {
+			// We could be bootraping on cygwin using .net runtime
+			var assembly = o.GetType ().Assembly;
+			if (assembly.GetName ().Version >= new Version (4, 0) && assembly.Location.Contains ("Microsoft.NET"))
+				return 0;
+
+			return 2;
+		}
+
+		var field = consts.GetField ("MonoVersion");
+		if (field == null)
+			return 3;
+
+		Version version;
+		if (!Version.TryParse (field.GetValue (null) as string, out version))
+			return 4;
+
+		if (version < new Version (3, 8))
+			return 5;
+
 		return 0;
 	}
 }