Index: tools/clang/include/clang/Basic/DiagnosticSemaKinds.td
===================================================================
--- ./tools/clang/include/clang/Basic/DiagnosticSemaKinds.td	(版本 179269)
+++ ./tools/clang/include/clang/Basic/DiagnosticSemaKinds.td	(工作副本)
@@ -5736,6 +5736,8 @@
 def warn_null_arg : Warning<
   "null passed to a callee which requires a non-null argument">,
   InGroup<NonNull>;
+def warn_null_ptr_deref: Warning<
+  "you are about to dereference null ptr, which probably will lead to seg violation. Do you want to proceed?[y/n]">;
 
 // CHECK: returning address/reference of stack memory
 def warn_ret_stack_addr : Warning<