================
@@ -7105,10 +7105,15 @@ void Clang::ConstructJob(Compilation &C, const 
JobAction &JA,
   Args.addOptInFlag(CmdArgs, options::OPT_frelaxed_template_template_args,
                     options::OPT_fno_relaxed_template_template_args);
 
-  // -fsized-deallocation is off by default, as it is an ABI-breaking change 
for
-  // most platforms.
-  Args.addOptInFlag(CmdArgs, options::OPT_fsized_deallocation,
-                    options::OPT_fno_sized_deallocation);
+  // -fsized-deallocation is on by default in C++14 onwards and otherwise off
+  // by default.
+  if (Arg *A = Args.getLastArg(options::OPT_fsized_deallocation,
----------------
wangpc-pp wrote:

Sorry I may not understand what you mean, can I leave it unchanged as this code 
is just like `-faligned-allocation`. We can change it later.

https://github.com/llvm/llvm-project/pull/83774
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