Fix Windows warning flags for icpx

Author: allnes

CMakeLists.txt

@@ -162,7 +162,11 @@ if(MSVC)
     add_compile_options(/wd4267 /wd4244 /wd4127 /wd4324)
 endif()
 
-if (NOT WIN32)
+if(NOT WIN32
+    OR (DEFINED CMAKE_C_COMPILER_FRONTEND_VARIANT
+        AND DEFINED CMAKE_CXX_COMPILER_FRONTEND_VARIANT
+        AND NOT CMAKE_C_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC"
+        AND NOT CMAKE_CXX_COMPILER_FRONTEND_VARIANT STREQUAL "MSVC"))
     set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Wextra -Werror")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -Werror")
 else()