[llvm] [llvm-lto2] Added llvm-lto2 -unified-lto descriptions (PR #148309)

[Faith Rivera via llvm-commits]

https://github.com/fnriv updated https://github.com/llvm/llvm-project/pull/148309

>From 44efd4d8a8cc5aa8c260b7103f36fa55000989bf Mon Sep 17 00:00:00 2001
From: Faith Rivera <103224896+fnriv at users.noreply.github.com>
Date: Thu, 10 Jul 2025 13:45:57 -0700
Subject: [PATCH] Add -unified-lto flag mode descriptions

---
 llvm/tools/llvm-lto2/llvm-lto2.cpp | 10 +++++++---
 1 file changed, 7 insertions(+), 3 deletions(-)

diff --git a/llvm/tools/llvm-lto2/llvm-lto2.cpp b/llvm/tools/llvm-lto2/llvm-lto2.cpp
index fbde66666a596..1f61dfec918b5 100644
--- a/llvm/tools/llvm-lto2/llvm-lto2.cpp
+++ b/llvm/tools/llvm-lto2/llvm-lto2.cpp
@@ -198,9 +198,13 @@ static cl::list<std::string>
     PassPlugins("load-pass-plugin",
                 cl::desc("Load passes from plugin library"));
 
-static cl::opt<std::string> UnifiedLTOMode("unified-lto", cl::Optional,
-                                           cl::desc("Set LTO mode"),
-                                           cl::value_desc("mode"));
+static cl::opt<std::string> UnifiedLTOMode(
+    "unified-lto", cl::Optional,
+    cl::desc("Set LTO mode with the following options:\n"
+             " thin      ThinLTO, with Unified LTO enabled.\n"
+             " full      Regular LTO, with Unified LTO enabled.\n"
+             " default   Any LTO mode without Unified LTO. The default mode."),
+    cl::value_desc("mode"));
 
 static cl::opt<bool> EnableFreestanding(
     "lto-freestanding",