[llvm] [gn build] Port c847ddf8f18d (PR #209151)

[Nico Weber via llvm-commits]

https://github.com/nico created https://github.com/llvm/llvm-project/pull/209151

None

>From 5d08994a0d903b2d08bb5f5f5a19985643e8e179 Mon Sep 17 00:00:00 2001
From: Nico Weber <thakis at chromium.org>
Date: Mon, 13 Jul 2026 07:46:45 -0400
Subject: [PATCH] [gn build] Port c847ddf8f18d

---
 llvm/utils/gn/secondary/lld/unittests/AsLibELF/BUILD.gn | 1 +
 1 file changed, 1 insertion(+)

diff --git a/llvm/utils/gn/secondary/lld/unittests/AsLibELF/BUILD.gn b/llvm/utils/gn/secondary/lld/unittests/AsLibELF/BUILD.gn
index e22a0eec1ff02..6c9ddb3fd3012 100644
--- a/llvm/utils/gn/secondary/lld/unittests/AsLibELF/BUILD.gn
+++ b/llvm/utils/gn/secondary/lld/unittests/AsLibELF/BUILD.gn
@@ -7,6 +7,7 @@ unittest("LLDAsLibELFTests") {
     "//lld/ELF",
   ]
   sources = [
+    "OutputStream.cpp",
     "ROCm.cpp",
     "SomeDrivers.cpp",
   ]