Handle .NET 8 in generator

Author: Sergio0694

nuget/Microsoft.Windows.CsWinRT.targets

@@ -162,7 +162,7 @@ Copyright (C) Microsoft Corporation. All rights reserved.
       <CsWinRTExeTFM Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) == 5">net5.0</CsWinRTExeTFM>
       <CsWinRTExeTFM Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) == 6">net6.0</CsWinRTExeTFM>
       <CsWinRTExeTFM Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) == 7">net7.0</CsWinRTExeTFM>
-      <CsWinRTExeTFM Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) == 8">net8.0</CsWinRTExeTFM>
+      <CsWinRTExeTFM Condition="$([MSBuild]::GetTargetFrameworkVersion('$(TargetFramework)')) >= 8">net8.0</CsWinRTExeTFM>
       <CsWinRTExeTFM Condition="'$(CsWinRTExeTFM)' == ''">netstandard2.0</CsWinRTExeTFM>
 
       <CsWinRTParams Condition="'$(CsWinRTParams)' == ''">

src/cswinrt/main.cpp

@@ -91,7 +91,7 @@ Where <spec> is one or more of:
 
         settings.verbose = args.exists("verbose");
         auto target = args.value("target");
-        if (!target.empty() && target != "netstandard2.0" && !starts_with(target, "net5.0") && !starts_with(target, "net6.0") && !starts_with(target, "net7.0"))
+        if (!target.empty() && target != "netstandard2.0" && !starts_with(target, "net5.0") && !starts_with(target, "net6.0") && !starts_with(target, "net7.0") && !starts_with(target, "net8.0"))
         {
             throw usage_exception();
         }