RFC: handling ISO C feature test macros

[Joseph Myers]

On Fri, 20 May 2016, Paul Eggert wrote:

> If this idea won't fly for some reason, I mildly prefer your method (a) to
> (b), as (a) is a bit easier for a casual reader to follow when reading
> installed .h files.

Does anyone else have comments on my question 
<https://sourceware.org/ml/libc-alpha/2016-05/msg00486.html>, or 
preferences between the two approaches suggested?

-- 
Joseph S. Myers
joseph@codesourcery.com