[RFC v2 1/3] cdefs: Add __bool

[Alejandro Colomar]

Hi Florian,

On Tue, Sep 02, 2025 at 03:41:18PM +0200, Florian Weimer wrote:
> * 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.

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


Have a lovely day!
Alex

-- 
<https://www.alejandro-colomar.es>
Use port 80 (that is, <...:80/>).
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