[compiler-rt] [compiler-rt][ASan] Work around msvc cl x64 build warnings (PR #156887)

[Zack Johnson via llvm-commits]

https://github.com/zacklj89 created https://github.com/llvm/llvm-project/pull/156887

None

>From 193f7aca560d7b34f35d7cfe453439fb6c26d3fa Mon Sep 17 00:00:00 2001
From: Zack Johnson <zajohnson at microsoft.com>
Date: Thu, 4 Sep 2025 09:50:48 -0400
Subject: [PATCH] [compiler-rt][ASan] Work around msvc cl x64 build warnings

---
 compiler-rt/lib/asan/CMakeLists.txt | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/compiler-rt/lib/asan/CMakeLists.txt b/compiler-rt/lib/asan/CMakeLists.txt
index 7d07ec765c005..459581fd0cff3 100644
--- a/compiler-rt/lib/asan/CMakeLists.txt
+++ b/compiler-rt/lib/asan/CMakeLists.txt
@@ -108,7 +108,8 @@ set(ASAN_CFLAGS ${SANITIZER_COMMON_CFLAGS})
 
 # Win/ASan relies on the runtime functions being hotpatchable. See
 # https://github.com/llvm/llvm-project/pull/149444
-if(MSVC)
+# MSVC cl 64 bit architectures treat /hotpatch as an unknown option
+if(CLANG_CL OR (MSVC AND "i386" IN_LIST ASAN_SUPPORTED_ARCH))
   list(APPEND ASAN_CFLAGS /hotpatch)
 endif()