From 4ae4590b6648f020e4ca9666fcd4b0abef66741f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Gardou?= <jerome.gardou@reactos.org>
Date: Thu, 29 Apr 2021 22:28:33 +0200
Subject: [PATCH] [CMAKE] Do not define _M_AMD64 when using amd64 clang-cl

---
 CMakeLists.txt | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/CMakeLists.txt b/CMakeLists.txt
index ac31959a410..d1e1e82eac4 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -215,7 +215,11 @@ Enable this if the module uses typeid or dynamic_cast. You will probably need to
             add_definitions(-DSARCH_PC98)
         endif()
     elseif(ARCH STREQUAL "amd64")
-        add_definitions(-D_M_AMD64 -D_AMD64_ -D__x86_64__ -D_WIN64)
+        # clang-cl defines this one for itself
+        if (NOT (MSVC AND CMAKE_C_COMPILER_ID STREQUAL "Clang"))
+            add_compile_definitions(_M_AMD64)
+        endif()
+        add_definitions(-D_AMD64_ -D__x86_64__ -D_WIN64)
     elseif(ARCH STREQUAL "arm")
         # _M_ARM is already defined by toolchain
         add_definitions(-D_ARM_ -D__arm__ -DWIN32)