Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/class/referencesource/mscorlib/system/CLRConfig.cs

@@ -0,0 +1,42 @@
+///------------------------------------------------------------------------------
+/// <copyright file="CLRConfig.cs" company="Microsoft">
+///     Copyright (c) Microsoft Corporation.  All rights reserved.
+/// </copyright>                               
+///
+/// <owner>gpaperin</owner>
+///------------------------------------------------------------------------------
+
+using System.Runtime.CompilerServices;
+using System.Runtime.Versioning;
+using System.Runtime.InteropServices;
+using System.Security;
+
+namespace System {
+
+/// <summary>
+/// For now, this class should be the central point to collect all managed declarations
+/// of native functions designed to expose config switches.
+/// In Dev11 M2.2 we will redesign this class to expose CLRConfig from within the CLR
+/// and refactor managed Fx code to access all compat switches through here.
+/// </summary>
+[FriendAccessAllowed]
+internal class CLRConfig {
+    
+    [FriendAccessAllowed]
+    [System.Security.SecurityCritical]
+    [MethodImplAttribute(MethodImplOptions.InternalCall)]
+    [ResourceExposure(ResourceScope.None)]
+    [SuppressUnmanagedCodeSecurity]
+    internal static extern bool CheckLegacyManagedDeflateStream();
+
+    [System.Security.SecurityCritical]
+    [MethodImplAttribute(MethodImplOptions.InternalCall)]
+    [ResourceExposure(ResourceScope.None)]
+    [SuppressUnmanagedCodeSecurity]
+    internal static extern bool CheckThrowUnobservedTaskExceptions();
+
+}  // internal class CLRConfig
+
+}  // namespace System
+
+// file CLRConfig