[RFC v4 1/4] cdefs: Add __bool

[Alejandro Colomar]

Hi Zack,

On Sun, Sep 14, 2025 at 10:57:03AM -0400, Zack Weinberg wrote:
> On Sun, Sep 14, 2025, at 2:01 AM, Alejandro Colomar wrote:
> > +#if defined __cplusplus
> > +# define __bool  bool
> > +#else
> > +# define __bool  _Bool
> > +#endif
> 
> Serious question: should this be this, or should it instead be
> 
> #if defined __cplusplus
> # define __bool  bool
> #elif defined __STDC_VERSION__ && __STDC_VERSION__ >= 199901L
> # define __bool  _Bool
> #else
> # error "GNU libc requires a C compiler that supports ISO C 1999"
> #endif
> 
> ? I can make an argument either way.

I think I prefer the latter.  Otherwise, users might be surprised by
weird compiler errors due to not having a definition of __bool, but they
have never explicitly asked for it.  Thanks!


Have a lovely day!
Alex

> 
> zw

-- 
<https://www.alejandro-colomar.es>
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