Re: master b99ec5d 3/3: Work around __has_attribute bug in clang 3.4

[Philipp Stephani]

Am Sa., 23. Jan. 2021 um 11:14 Uhr schrieb Mattias Engdegård <mattiase@acm.org>:
>
> 23 jan. 2021 kl. 01.46 skrev Paul Eggert <eggert@cs.ucla.edu>:
>
> > Perhaps someone who can build on macOS directly can provide more info about 
> > the problem. I had no problem building with clang 11.0 on Ubuntu but 
> > Apple's clang is special.
>
> Apple's clang seems to come with a builtin
>
> #define __nonnull _Nonnull
>
> which clashes with the the one in lib/cdefs.h. Perhaps we should call it 
> something else.


Gnulib should avoid identifiers starting with an underscore, as they
are reserved for the implementation.