Warning specifically for a returning noreturn

[LIU Hao]

在 2023/7/5 09:40, Andrew Pinski via Gcc 写道:
> It is wrong to use noreturn on a function other than one which has a
> return type of void as documented.
> https://gcc.gnu.org/onlinedocs/gcc/Common-Function-Attributes.html#index-noreturn-function-attribute
> :
> ```
> It does not make sense for a noreturn function to have a return type
> other than void.
> ```

It makes sense for a callback or virtual function which requires a non-void return type, e.g.

```
class my_stream : public std::streambuf
   {
   protected:
     virtual
     int
     underflow() override;
   };

__attribute__((__noreturn__))   // [[noreturn]] won't work
int
my_stream::
underflow()
   {
     throw std::invalid_argument("not implemented");
   }
```



-- 
Best regards,
LIU Hao

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