Re: 'signbit' patch to use 'copysign' if available

[Bruno Haible]

Paul Eggert wrote:
> > Globally, I think this is backwards: 'copysign' is a more general function
> > than 'signbit',
> 
> That's true in general but this is a special case.  'copysign' has
> been standardized since 1985, is well understood, and is available on
> many older platforms.  'signbit' was standardized far more recently,
> and is not available on many platforms that are still shipping, e.g.,
> Solaris 9.

Sure. But I find it better if the structure of the gnulib code (or any code,
more generally) is a function of the logic/semantics that it implements, not
a function of the history of various standards.

Bruno