[RFC v2 1/3] cdefs: Add __bool

[Collin Funk]

Alejandro Colomar <alx@kernel.org> writes:

>> Hmmmm, true.  Can we drop support for compilers that don't have
>> _Bool/bool?  That would be the easiest thing to do:
>> 
>> 	#if defined __cplusplus
>> 	# define __bool  bool
>> 	#else
>> 	# define __bool  _Bool
>> 	#endif
>
> Self-reply:
>
> This seems entirely possible, given the glibc documentation requires
> GCC 12.1 at least.
> <https://sourceware.org/glibc/manual/latest/html_node/Tools-for-Compilation.html>

We shouldn't use _Bool in C23 since compilers are free to stop
supporting it at any time. You can use the expression
"202311L <= __STDC_VERSION__".

Collin