From 0a73774fc6694061853e2c005b08481876f674ae Mon Sep 17 00:00:00 2001
From: sveinungf <ikonage@gmail.com>
Date: Sat, 25 Nov 2023 10:48:53 +0100
Subject: [PATCH] Resolve trim warnings for the SourceGenerator project by not
 referencing the Polyfill package

---
 Directory.Build.props                                 |  2 +-
 .../Helpers/Backporting/NotNullWhenAttribute.cs       | 11 +++++++++++
 .../SpreadCheetah.TrimCheck.Cmd.csproj                |  1 +
 3 files changed, 13 insertions(+), 1 deletion(-)
 create mode 100644 SpreadCheetah.SourceGenerator/Helpers/Backporting/NotNullWhenAttribute.cs

diff --git a/Directory.Build.props b/Directory.Build.props
index 4518c54a..88649f12 100644
--- a/Directory.Build.props
+++ b/Directory.Build.props
@@ -9,7 +9,7 @@
     <AccelerateBuildsInVisualStudio>true</AccelerateBuildsInVisualStudio>
   </PropertyGroup>
 
-  <ItemGroup Condition="'$(MSBuildProjectName)' != 'SpreadCheetah.SourceGenerator.CSharp8Test'">
+  <ItemGroup Condition="'$(MSBuildProjectName)' != 'SpreadCheetah.SourceGenerator' And '$(MSBuildProjectName)' != 'SpreadCheetah.SourceGenerator.CSharp8Test'">
     <PackageReference Include="Polyfill">
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
diff --git a/SpreadCheetah.SourceGenerator/Helpers/Backporting/NotNullWhenAttribute.cs b/SpreadCheetah.SourceGenerator/Helpers/Backporting/NotNullWhenAttribute.cs
new file mode 100644
index 00000000..1e4f733e
--- /dev/null
+++ b/SpreadCheetah.SourceGenerator/Helpers/Backporting/NotNullWhenAttribute.cs
@@ -0,0 +1,11 @@
+#if NETSTANDARD2_0
+namespace System.Diagnostics.CodeAnalysis;
+
+[AttributeUsage(AttributeTargets.Parameter, Inherited = false)]
+internal sealed class NotNullWhenAttribute : Attribute
+{
+    public bool ReturnValue { get; }
+
+    public NotNullWhenAttribute(bool returnValue) => ReturnValue = returnValue;
+}
+#endif
\ No newline at end of file
diff --git a/SpreadCheetah.TrimCheck.Cmd/SpreadCheetah.TrimCheck.Cmd.csproj b/SpreadCheetah.TrimCheck.Cmd/SpreadCheetah.TrimCheck.Cmd.csproj
index 9aa72f57..f3b3d347 100644
--- a/SpreadCheetah.TrimCheck.Cmd/SpreadCheetah.TrimCheck.Cmd.csproj
+++ b/SpreadCheetah.TrimCheck.Cmd/SpreadCheetah.TrimCheck.Cmd.csproj
@@ -4,6 +4,7 @@
     <OutputType>Exe</OutputType>
     <TargetFramework>net8.0</TargetFramework>
     <PublishTrimmed>true</PublishTrimmed>
+    <TrimmerSingleWarn>false</TrimmerSingleWarn>
   </PropertyGroup>
 
   <ItemGroup>