From 63944988a25335a5ac97f4028e759aede04a8458 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Gardou?= <jerome.gardou@reactos.org>
Date: Thu, 22 Apr 2021 17:31:39 +0200
Subject: [PATCH] [CMAKE] Disable SSE instruction on GCC amd64 builds

Except for user-mode modules
---
 sdk/cmake/gcc.cmake | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/sdk/cmake/gcc.cmake b/sdk/cmake/gcc.cmake
index f542d34ef19..25893031e52 100644
--- a/sdk/cmake/gcc.cmake
+++ b/sdk/cmake/gcc.cmake
@@ -172,6 +172,14 @@ add_definitions(-D_inline=__inline)
 # Fix build with GLIBCXX + our c++ headers
 add_definitions(-D_GLIBCXX_HAVE_BROKEN_VSWPRINTF)
 
+# Disable SSE globally on amd64 builds.
+# We can't disable it for kernel mode modules only,
+# as we don't call set_module_type on static libraries
+# Instead we disable this options for user-mode modules
+if(ARCH STREQUAL "amd64")
+    add_compile_options(-mno-sse)
+endif()
+
 # Alternative arch name
 if(ARCH STREQUAL "amd64")
     set(ARCH2 x86_64)
@@ -314,6 +322,9 @@ function(set_module_type_toolchain MODULE TYPE)
 
         # Believe it or not, cmake doesn't do that
         set_property(TARGET ${MODULE} APPEND PROPERTY LINK_DEPENDS $<TARGET_PROPERTY:native-pefixup,IMPORTED_LOCATION>)
+    else()
+        # We can safely use SSE for user-mode parts
+        remove_target_compile_option(${MODULE} -mno-sse)
     endif()
 endfunction()