From 353f87ebc396bf2dc7102e98178759105f8239ab Mon Sep 17 00:00:00 2001
From: Duo Wang <Duo.Wang@sony.com>
Date: Sat, 2 Dec 2023 12:23:39 -0800
Subject: [PATCH] turn off lld string tail merging when ASAN is turned on

---
 llvm/cmake/modules/HandleLLVMOptions.cmake | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/llvm/cmake/modules/HandleLLVMOptions.cmake b/llvm/cmake/modules/HandleLLVMOptions.cmake
index 6a3c49edc912d..671600c4631c7 100644
--- a/llvm/cmake/modules/HandleLLVMOptions.cmake
+++ b/llvm/cmake/modules/HandleLLVMOptions.cmake
@@ -988,6 +988,9 @@ if(LLVM_USE_SANITIZER)
       endif()
       # Prepare ASAN runtime if needed
       if (LLVM_USE_SANITIZER MATCHES ".*Address.*")
+        # lld string tail merging interacts badly with ASAN on Windows, turn it off here
+        # See https://github.com/llvm/llvm-project/issues/62078
+        append("/opt:nolldtailmerge" CMAKE_EXE_LINKER_FLAGS CMAKE_MODULE_LINKER_FLAGS CMAKE_SHARED_LINKER_FLAGS)
         if (${CMAKE_MSVC_RUNTIME_LIBRARY} MATCHES "^(MultiThreaded|MultiThreadedDebug)$")
           append("/wholearchive:clang_rt.asan-${arch}.lib /wholearchive:clang_rt.asan_cxx-${arch}.lib"
             CMAKE_EXE_LINKER_FLAGS)