On Tue, Oct 27, 2020 at 12:57 AM Arnd Bergmann <[email protected]> wrote:
>
> +#ifdef __has_builtin
> +#define has_builtin(x) __has_builtin(x)
> +#else
> +#define has_builtin(x) (0)
> +#endif
Could this be
#ifndef __has_builtin
# define __has_builtin(x) 0
#endif
? i.e. mimicking what we do for `__has_attribute`.
It would also be a nice idea to put a reminder comment like:
/*
* __has_builtin is supported on gcc >= 10, clang >= 3 and icc >= 21.
* In the meantime, to support gcc < 10, we implement __has_builtin
* by hand.
*/
Cheers,
Miguel
