From 5f756a6ceb390a4fd71b7e0d6b1493881a4796c8 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Mon, 3 Jul 2023 22:00:38 +0200
Subject: [PATCH] Add `TargetFrameworkAttribute` to compiled C# assembly

---
 .../Tools/Flax.Build/Build/DotNet/Builder.DotNet.cs  | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

diff --git a/Source/Tools/Flax.Build/Build/DotNet/Builder.DotNet.cs b/Source/Tools/Flax.Build/Build/DotNet/Builder.DotNet.cs
index 454376c61..13433f92c 100644
--- a/Source/Tools/Flax.Build/Build/DotNet/Builder.DotNet.cs
+++ b/Source/Tools/Flax.Build/Build/DotNet/Builder.DotNet.cs
@@ -4,6 +4,7 @@ using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
+using System.Text;
 using Flax.Build.Graph;
 using Flax.Build.NativeCpp;
 using Flax.Deploy;
@@ -12,7 +13,7 @@ namespace Flax.Build
 {
     static partial class Builder
     {
-        public static event Action<TaskGraph, BuildData, NativeCpp.BuildOptions, Task, IGrouping<string, Module>> BuildDotNetAssembly;
+        public static event Action<TaskGraph, BuildData, BuildOptions, Task, IGrouping<string, Module>> BuildDotNetAssembly;
 
         private static void BuildTargetDotNet(RulesAssembly rules, TaskGraph graph, Target target, Platform platform, TargetConfiguration configuration)
         {
@@ -151,7 +152,7 @@ namespace Flax.Build
             }
         }
 
-        private static void BuildDotNet(TaskGraph graph, BuildData buildData, NativeCpp.BuildOptions buildOptions, string name, List<string> sourceFiles, HashSet<string> fileReferences = null, IGrouping<string, Module> binaryModule = null)
+        private static void BuildDotNet(TaskGraph graph, BuildData buildData, BuildOptions buildOptions, string name, List<string> sourceFiles, HashSet<string> fileReferences = null, IGrouping<string, Module> binaryModule = null)
         {
             // Setup build options
             var buildPlatform = Platform.BuildTargetPlatform;
@@ -277,6 +278,13 @@ namespace Flax.Build
             foreach (var sourceFile in sourceFiles)
                 args.Add("\"" + sourceFile + "\"");
 
+#if USE_NETCORE
+            // Inject some assembly metadata (similar to msbuild in Visual Studio)
+            var assemblyAttributesPath = Path.Combine(buildOptions.IntermediateFolder, name + ".AssemblyAttributes.cs");
+            File.WriteAllText(assemblyAttributesPath, $"[assembly: global::System.Runtime.Versioning.TargetFrameworkAttribute(\".NETCoreApp,Version=v{runtimeVersionShort}\", FrameworkDisplayName = \".NET {runtimeVersionShort}\")]\n", Encoding.UTF8);
+            args.Add("\"" + assemblyAttributesPath + "\"");
+#endif
+
             // Generate response file with source files paths and compilation arguments
             string responseFile = Path.Combine(buildOptions.IntermediateFolder, name + ".response");
             Utilities.WriteFileIfChanged(responseFile, string.Join(Environment.NewLine, args));