diff --git a/_xtool/llcppsymg/_cmptest/clangutils_test/clangutils.go b/_xtool/llcppsymg/_cmptest/clangutils_test/clangutils.go
index 80816b50..9d178b20 100644
--- a/_xtool/llcppsymg/_cmptest/clangutils_test/clangutils.go
+++ b/_xtool/llcppsymg/_cmptest/clangutils_test/clangutils.go
@@ -11,6 +11,7 @@ import (
 
 func main() {
 	TestClangUtil()
+	TestPreProcess()
 }
 
 func TestClangUtil() {
@@ -117,3 +118,32 @@ func TestClangUtil() {
 		fmt.Println()
 	}
 }
+
+func TestPreProcess() {
+	config := &clangutils.Config{
+		File: `
+		#include <inter.h>
+		#include <compat.h>
+		`,
+		Temp:  true,
+		IsCpp: false,
+		Args:  []string{"-I./hfile", "-E"},
+	}
+	index, unit, err := clangutils.CreateTranslationUnit(config)
+	if err != nil {
+		fmt.Printf("CreateTranslationUnit failed: %v\n", err)
+	}
+
+	fmt.Println("CreateTranslationUnit succeeded")
+
+	cursor := unit.Cursor()
+
+	clangutils.VisitChildren(cursor, func(cursor, parent clang.Cursor) clang.ChildVisitResult {
+		if cursor.Kind != clang.CursorMacroDefinition {
+			fmt.Println(clang.GoString(cursor.Location().File().FileName()), clang.GoString(cursor.String()))
+		}
+		return clang.ChildVisit_Recurse
+	})
+	index.Dispose()
+	unit.Dispose()
+}
diff --git a/_xtool/llcppsymg/_cmptest/clangutils_test/hfile/compat.h b/_xtool/llcppsymg/_cmptest/clangutils_test/hfile/compat.h
new file mode 100644
index 00000000..9547760c
--- /dev/null
+++ b/_xtool/llcppsymg/_cmptest/clangutils_test/hfile/compat.h
@@ -0,0 +1,4 @@
+#ifndef COMPAT_H
+#define COMPAT_H
+typedef foo foo2;
+#endif
diff --git a/_xtool/llcppsymg/_cmptest/clangutils_test/hfile/inter.h b/_xtool/llcppsymg/_cmptest/clangutils_test/hfile/inter.h
new file mode 100644
index 00000000..061cc0f3
--- /dev/null
+++ b/_xtool/llcppsymg/_cmptest/clangutils_test/hfile/inter.h
@@ -0,0 +1,6 @@
+#ifndef INTER_H
+#define INTER_H
+typedef long foo;
+#include "compat.h"
+typedef foo2 foo3;
+#endif
\ No newline at end of file
diff --git a/_xtool/llcppsymg/_cmptest/clangutils_test/llgo.expect b/_xtool/llcppsymg/_cmptest/clangutils_test/llgo.expect
index de8589e7..22a4f083 100644
--- a/_xtool/llcppsymg/_cmptest/clangutils_test/llgo.expect
+++ b/_xtool/llcppsymg/_cmptest/clangutils_test/llgo.expect
@@ -17,6 +17,15 @@ Namespace: TestNamespace
 Function/Method: namespaced_function
 Scoping parts: [TestNamespace namespaced_function]
 
+CreateTranslationUnit succeeded
+temp.h inter.h
+./hfile/inter.h compat.h
+temp.h compat.h
+./hfile/inter.h foo
+./hfile/compat.h foo2
+./hfile/compat.h foo
+./hfile/inter.h foo3
+./hfile/inter.h foo2
 
 #stderr