问题
Simlar question with LINE
But when I replaced __LINE__ with __FUNCTION__.
Macro concat string literal "__FUNCTION__" and not actual function name.
回答1:
__FUNCTION__ is not a macro, it's an implicitly declared static array. The same is true for __func__, __PRETTY_FUNCTION__, etc.
Thus # can't work on it. If you want to concatenate something to it, you'll have to do that at runtime.
来源：https://stackoverflow.com/questions/65798613/stringizing-with-function-not-working