[WIP] Trying a hack

Author: grendello

src/Xamarin.Android.Build.Tasks/Tasks/PrependEnvironmentVariable.cs

@@ -0,0 +1,36 @@
+using System;
+using System.IO;
+using System.Linq;
+using Microsoft.Build.Framework;
+using Microsoft.Build.Utilities;
+using Xamarin.Tools.Zip;
+using Microsoft.Android.Build.Tasks;
+
+namespace Xamarin.Android.Tasks
+{
+	public class PrependEnvironmentVariable : AndroidTask
+	{
+		public override string TaskPrefix => "PENV";
+
+		[Required]
+		public string Name { get; set; }
+
+		[Required]
+		public string Value { get; set; }
+
+		public override bool RunTask ()
+		{
+			string? oldValue = Environment.GetEnvironmentVariable (Name)?.Trim ();
+			string newValue;
+
+			if (!String.IsNullOrEmpty (oldValue)) {
+				newValue = $"{Value}:{oldValue}";
+			} else {
+				newValue = Value;
+			}
+
+			Environment.SetEnvironmentVariable (Name, newValue);
+			return true;
+		}
+	}
+}

src/Xamarin.Android.Build.Tasks/Xamarin.Android.Common.targets

@@ -91,6 +91,8 @@ Copyright (C) 2011-2012 Xamarin. All rights reserved.
 <UsingTask TaskName="Xamarin.Android.Tasks.PrepareAbiItems" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
 <UsingTask TaskName="Xamarin.Android.Tasks.WriteLockFile" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
 <UsingTask TaskName="GenerateCompressedAssembliesNativeSourceFiles" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
+<UsingTask TaskName="PrependEnvironmentVariable" AssemblyFile="Xamarin.Android.Build.Tasks.dll" />
+
 <!--
 *******************************************
   Extensibility hook that allows VS to
@@ -102,7 +104,6 @@ Copyright (C) 2011-2012 Xamarin. All rights reserved.
         Condition="Exists('$(MSBuildThisFileDirectory)$(MSBuildThisFileName).Before.targets')"/>
 
 
-
 <!--
 *******************************************
           Code Analysis Setup
@@ -357,6 +358,23 @@ Copyright (C) 2011-2012 Xamarin. All rights reserved.
 <Import Project="$(MSBuildThisFileDirectory)Xamarin.Android.Legacy.targets" Condition=" '$(UsingAndroidNETSdk)' != 'True' " />
 <Import Project="$(MSBuildThisFileDirectory)Xamarin.Android.Wear.targets"   Condition=" '$(UsingAndroidNETSdk)' != 'True' " />
 
+<!-- hack, hack -->
+<Target Name="_SetSharedLibraryLoaderEnvironmentVariables"
+        Condition="'$(UsingAndroidNETSdk)' == 'true'"
+        BeforeTargets="PrepareForBuild">
+  <PrependEnvironmentVariable
+      Condition=" '$([MSBuild]::IsOSPlatform(Linux))' == 'true' "
+      Name="LD_LIBRARY_PATH"
+      Value="$(MSBuildThisFileDirectory)runtimes/linux-x64"
+  />
+
+  <PrependEnvironmentVariable
+      Condition=" '$([MSBuild]::IsOSPlatform(OSX))' == 'true' "
+      Name="DYLD_FALLBACK_LIBRARY_PATH"
+      Value="$(MSBuildThisFileDirectory)runtimes/osx-x64:$(MSBuildThisFileDirectory)runtimes/osx-arm64"
+  />
+</Target>
+
 <Target Name="_WriteLockFile" Condition=" '$(_AndroidDetectParallelBuilds)' == 'True' ">
   <WriteLockFile LockFile="$(IntermediateOutputPath).__lock" />
 </Target>