> This will run the test only once with -std=c++11. We'll get better coverage
> with dropping the line above and using
>
> /* { dg-do compile { target { tail_call && { c || c++11 } } } } */
>
> but here it may not matter.The problem is that older C/C++ standards don't support [[]] attributes. It would make sense to say >= gnu++11 || >= c23 but I don't know how to express that.
