On Fri, 13 Jul 2018, Florian Weimer wrote:

> I think ONCE_FLAG_INIT needs to be a compound literal, not an initializer, at
> least that's how I read the standard (“which expands to a value that can be
> used to initialize an object”).

I think it has to be valid as a static initializer.  Which means it can't 
be a compound literal, because standard C doesn't allow those in static 
initializers.  (I read "value" as meaning "expansion of the macro" not 
"value of an object type".)

-- 
Joseph S. Myers
joseph@codesourcery.com