Strip enum member type name from sibling references in initializers

sources/ClangSharp.PInvokeGenerator/PInvokeGenerator.VisitStmt.cs

@@ -1020,6 +1020,16 @@ private void VisitDeclRefExpr(DeclRefExpr declRefExpr)
 
         if (declRefExpr.Decl is EnumConstantDecl enumConstantDecl)
         {
+            if (enumConstantDecl.DeclContext is NamedDecl enumTypeDecl)
+            {
+                var enumTypeName = GetRemappedCursorName(enumTypeDecl, out _, skipUsing: true);
+
+                if (!IsAnonymousEnum(enumTypeName))
+                {
+                    escapedName = EscapeAndStripEnumMemberName(name, enumTypeName);
+                }
+            }
+
             if ((declRefExpr.DeclContext != enumConstantDecl.DeclContext) && (enumConstantDecl.DeclContext is NamedDecl namedDecl))
             {
                 var enumName = GetRemappedCursorName(namedDecl, out _, skipUsing: true);

tests/ClangSharp.PInvokeGenerator.UnitTests/StripEnumMemberReferenceTest.cs

@@ -0,0 +1,45 @@
+// Copyright (c) .NET Foundation and Contributors. All Rights Reserved. Licensed under the MIT License (MIT). See License.md in the repository root for more information.
+
+using System.Threading.Tasks;
+using NUnit.Framework;
+
+namespace ClangSharp.UnitTests;
+
+/// <summary>
+/// Regression test for https://github.com/dotnet/ClangSharp/issues/576.
+/// When <c>strip-enum-member-type-name</c> is used, references to sibling enum members inside
+/// an initializer expression must be stripped the same way as the member declarations, otherwise
+/// the emitted code references undefined names.
+/// </summary>
+[Platform("win")]
+public sealed class StripEnumMemberReferenceTest : PInvokeGeneratorTest
+{
+    [Test]
+    public Task SiblingReferencesAreStripped()
+    {
+        var inputContents = @"typedef enum WGPUInstanceBackend
+{
+    WGPUInstanceBackend_Vulkan = 1 << 0,
+    WGPUInstanceBackend_GL = 1 << 1,
+    WGPUInstanceBackend_Metal = 1 << 2,
+    WGPUInstanceBackend_Primary = WGPUInstanceBackend_Vulkan | WGPUInstanceBackend_Metal,
+    WGPUInstanceBackend_Secondary = WGPUInstanceBackend_GL
+} WGPUInstanceBackend;
+";
+
+        var expectedOutputContents = @"namespace ClangSharp.Test
+{
+    public enum WGPUInstanceBackend
+    {
+        Vulkan = 1 << 0,
+        GL = 1 << 1,
+        Metal = 1 << 2,
+        Primary = Vulkan | Metal,
+        Secondary = GL,
+    }
+}
+";
+
+        return ValidateGeneratedCSharpLatestWindowsBindingsAsync(inputContents, expectedOutputContents, PInvokeGeneratorConfigurationOptions.StripEnumMemberTypeName);
+    }
+}