[RFC v2 1/3] cdefs: Add __bool

[Florian Weimer]

* Alejandro Colomar:

> Signed-off-by: Alejandro Colomar <alx@kernel.org>
> ---
>  misc/sys/cdefs.h | 12 ++++++++++++
>  1 file changed, 12 insertions(+)
>
> diff --git a/misc/sys/cdefs.h b/misc/sys/cdefs.h
> index 215ff937ee..1cd8f1e85b 100644
> --- a/misc/sys/cdefs.h
> +++ b/misc/sys/cdefs.h
> @@ -57,6 +57,18 @@
>  # define __glibc_has_extension(ext) 0
>  #endif
>  
> +#if defined __cplusplus
> +# define __bool   bool
> +#elif defined __GNUC__ || defined __clang__
> +# if __GNUC_PREREQ (3, 0)
> +#  define __bool  _Bool
> +# else
> +#  define __bool  int
> +# endif
> +#else
> +# define __bool  _Bool
> +#endif

This changes ABI based on the detected compiler, so it's really not
possible to do it this way.

Thanks,
Florian