Add avx512 checks

Author: sin3point14

cmake/find/FindAVX.cmake

@@ -116,8 +116,14 @@ if(CMAKE_COMPILER_IS_GNUCC OR CMAKE_COMPILER_IS_GNUCXX OR CMAKE_CXX_COMPILER_ID
   elseif(DETECTED_AVX_10)
       SET(AVX_FLAGS "${AVX_FLAGS} -mavx")
   endif()
-  # TODO: Check for AVX512 support
-  SET(AVX_FLAGS "${AVX_FLAGS} -mno-avx512f -mno-avx512pf -mno-avx512er -mno-avx512cd")
+  # Only add -mno-avx512* if the compiler accepts them
+  foreach(flag -mno-avx512f -mno-avx512pf -mno-avx512er -mno-avx512cd)
+    string(REPLACE "-" "_" safe_flag ${flag})
+    check_cxx_compiler_flag("${flag}" HAS_FLAG_${safe_flag})
+    if(HAS_FLAG_${safe_flag})
+      set(AVX_FLAGS "${AVX_FLAGS} ${flag}")
+    endif()
+  endforeach()
 elseif(CMAKE_CXX_COMPILER_ID MATCHES "Intel")
   set(AVX_FLAGS "-xHost")
 elseif(MSVC)