Fix compiler version check for Intel Cooperlake support (clang-cl does not accept -dumpversion)

cmake/system.cmake

@@ -148,16 +148,20 @@ endif ()
 include("${PROJECT_SOURCE_DIR}/cmake/prebuild.cmake")
 if (DEFINED TARGET)
   if (${TARGET} STREQUAL COOPERLAKE AND NOT NO_AVX512)
-#    if (${CMAKE_C_COMPILER_ID} STREQUAL "GNU")
+    if (${CMAKE_C_COMPILER_ID} STREQUAL "GNU")
       execute_process(COMMAND ${CMAKE_C_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
-        if (${GCC_VERSION} VERSION_GREATER 10.1 OR ${GCC_VERSION} VERSION_EQUAL 10.1)
+        if (${CMAKE_C_COMPILER_VERSION} VERSION_GREATER 10.1 OR ${CMAKE_C_COMPILER_VERSION} VERSION_EQUAL 10.1)
+          set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=cooperlake")
+        else()
+          set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=skylake-avx512")
+        endif()
+    elseif (${CMAKE_C_COMPILER_ID} STREQUAL "CLANG")
+         if (${CMAKE_C_COMPILER_VERSION} VERSION_GREATER 8.99)
           set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=cooperlake")
         else()
           set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=skylake-avx512")
         endif()
-#    elseif (${CMAKE_C_COMPILER_ID} STREQUAL "CLANG")
-#      set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -mavx2")
-#    endif()    
+    endif()    
   endif()
   if (${TARGET} STREQUAL SKYLAKEX AND NOT NO_AVX512)
     set (KERNEL_DEFINITIONS "${KERNEL_DEFINITIONS} -march=skylake-avx512")