add more strict macro definition check

hnes · hnes · commit 40b08c5f179a · 2018-07-25T19:47:15.000+08:00
diff --git a/aco.h b/aco.h
@@ -136,6 +136,9 @@ struct aco_s{
     }   \
 } while(0)
 
+#if defined(aco_attr_no_asan)
+    #error "aco_attr_no_asan already defined"
+#endif
 #if defined(ACO_USE_ASAN)
     #if defined(__has_feature)
         #if __has_feature(address_sanitizer)
