From f05b4c408581f087e250e5f85d36c41177ac7acd Mon Sep 17 00:00:00 2001
From: Rahul Joshi <rjoshi@nvidia.com>
Date: Thu, 29 Jan 2026 08:03:22 -0800
Subject: [PATCH] [NFC][LLVM] Fix macro redefinition warning in Extensions.cpp
 (#178555)

Also add missing file header and fixed code to used nested namespace for
definining the anchor function.
---
 llvm/lib/Extensions/Extensions.cpp | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/llvm/lib/Extensions/Extensions.cpp b/llvm/lib/Extensions/Extensions.cpp
index 3e9f76d12308..2f7401980d0b 100644
--- a/llvm/lib/Extensions/Extensions.cpp
+++ b/llvm/lib/Extensions/Extensions.cpp
@@ -1,15 +1,26 @@
+//===----------------------------------------------------------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+//
+// Anchor for pass plugins.
+//
+//===----------------------------------------------------------------------===//
+
 #include "llvm/Plugins/PassPlugin.h"
+
 #define HANDLE_EXTENSION(Ext)                                                  \
 		llvm::PassPluginLibraryInfo get##Ext##PluginInfo();
 #include "llvm/Support/Extension.def"
+#undef HANDLE_EXTENSION
 
-
-namespace llvm {
-	namespace details {
-		void extensions_anchor() {
+namespace llvm::details {
+void extensions_anchor() {
 #define HANDLE_EXTENSION(Ext)                                                  \
 			get##Ext##PluginInfo();
 #include "llvm/Support/Extension.def"
-		}
-	}
 }
+} // namespace llvm::details