fix build with clang-cl due to _Check_return_ (issue
@@ -26,7 +26,7 @@ terms of the MIT license. A copy of the license can be found in the file
#if (__cplusplus >= 201703)
#define mi_decl_nodiscard [[nodiscard]]
-#elif (__GNUC__ >= 4)
+#elif (__GNUC__ >= 4) || defined(__clang__) // includes clang, icc, and clang-cl
#define mi_decl_nodiscard __attribute__((warn_unused_result))
#elif (_MSC_VER >= 1700)
#define mi_decl_nodiscard _Check_return_
