[PATCH 1/4] Use nanf("") instead of nanf(NULL)

[Joseph Myers]

On Mon, 27 Aug 2018, Craig Howland wrote:

> Do we want to allow this recent GCC change to force a source change, when the
> GCC change (added warning) is not a solid one?  The C standard does not
> require that the argument to nan() be non-null, although invoking general,

The argument must, as per DR#477 (resolution integrated in C17), be a 
string.

http://www.open-std.org/jtc1/sc22/wg14/www/docs/n2257.htm#dr_477

-- 
Joseph S. Myers
joseph@codesourcery.com